JP2013036902A - Analyzer, evaluation device, analysis method, and evaluation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an analyzer which facilitates analysis of welding deformation and residual stress and improves evaluation accuracy.SOLUTION: An inventive analyzer 1 comprises: analysis means 2 which performs two-dimensional thermal elastic-plastic analysis on the basis of material properties of a component, a welding heat input, a joint shape, a welding speed, a groove shape, a board thickness, and the number of weld paths of a weld zone, and obtains a first inherent strain distribution in the plane of the weld zone in a two-dimensional model; conversion means 3 which converts the obtained first inherent strain distribution in the two-dimensional model to a first inherent strain distribution in a cross section orthogonal to a weld line at the weld line center in a three-dimensional model; output means 4 which outputs a second inherent strain distribution in a weld line longitudinal direction on the basis of the converted first inherent strain distribution in the three-dimensional model; and elastic analysis means 5 which performs elastic analysis of the three-dimensional model using an inherent strain method on the basis of the first inherent strain distribution and the second inherent strain distribution, and obtains welding deformation and a residual stress of a structure.

Description

  Embodiments described herein relate generally to an analysis apparatus, an evaluation apparatus, an analysis method, and an evaluation method for analyzing and evaluating welding deformation and residual stress generated in a structure.

  As an analysis method, thermal elasto-plastic analysis using the Finite Element Method (hereinafter referred to as “FEM”) is performed, and welding deformation generated in the structure during welding or residual remaining in the structure after welding. What evaluates stress, and evaluates the residual stress remaining in the structure after welding and welding deformation that occurs in the structure during welding simply by elastic analysis using concepts such as the inherent strain of the structure Has been proposed.

JP 2009-250829 A JP-A-6-186141

  However, it is practically difficult to evaluate the welding deformation and residual stress of the structure with the current apparatus. That is, in such an apparatus, the amount of calculation is increased in order to perform a three-dimensional thermoelastic-plastic analysis, and it takes a lot of time to evaluate weld deformation and residual stress of the structure. The more complex, the more difficult the evaluation is, and the elastic analysis using only typical eigenstrain without considering the eigenstrain distribution of the actual structure, etc., makes the evaluation accuracy of the actual structure lower. It was difficult to evaluate correctly.

  An object of the present invention is to provide an analysis device, an evaluation device, an analysis method, and an evaluation method that can easily analyze welding deformation and residual stress and can improve evaluation accuracy.

  The analysis apparatus according to the embodiment includes a material to be welded and welded material of a welded portion of a structure to be input, welding heat input, a joint shape of the welded portion, a welding speed, a groove shape of the welded portion, and a plate thickness. Then, based on the number of welding passes, a two-dimensional thermal elastic-plastic analysis of the welded portion is performed, and the second portion of the welded portion in the plane of the welded portion in the two-dimensional model when there is uniform heat input in the weld line direction of the welded portion. A two-dimensional thermoelastic-plastic analysis means for obtaining a distribution of one intrinsic strain, and the distribution of the first intrinsic strain in the obtained two-dimensional model in the three-dimensional model in the case where there is heat input at the center of the weld line. Based on the inherent strain conversion means for converting to the distribution of the first inherent strain in the cross section orthogonal to the weld line at the center of the weld line, and based on the distribution of the first inherent strain in the converted three-dimensional model, Length of the weld line An inherent strain distribution output means for outputting the distribution of the second intrinsic strain of the first, a third order using an intrinsic strain method based on the obtained distribution of the first intrinsic strain and the output distribution of the second intrinsic strain. An inherent strain method elastic analysis means for performing an inherent strain method elastic analysis of the original model to obtain weld deformation and residual stress of the structure.

  Moreover, the evaluation apparatus of the embodiment includes the analysis apparatus described above, the input constraint strength of the structure, the welded member of the welded part and the material physical properties of the welded member, the number of welding passes, the joint shape, the plate thickness, Evaluation means for evaluating welding deformation and residual stress of the structure based on heat input, groove shape, and welding material.

  In the analysis method of the embodiment, the two-dimensional thermal elasto-plastic analysis means inputs the material to be welded of the welded part of the structure and the material property of the welded member, welding heat input, joint shape of the welded part, welding Based on the speed, the groove shape of the weld, the plate thickness, and the number of weld passes, a two-dimensional thermal elastic-plastic analysis of the weld is performed, and there is uniform heat input in the weld line direction of the weld. A step of obtaining a distribution of the first intrinsic strain in the plane of the weld in the two-dimensional model, and an intrinsic strain converting means, wherein the distribution of the first intrinsic strain in the obtained two-dimensional model is represented by the center of the weld line. A step of converting to a distribution of the first inherent strain at a cross section orthogonal to the weld line at the center of the weld line in the three-dimensional model when there is heat input, and an inherent strain distribution output means includes the converted tertiary Previous in original model A step of outputting a distribution of a second intrinsic strain in the longitudinal direction of the weld line of the weld based on the distribution of the first intrinsic strain; And performing an inherent strain method elastic analysis of a three-dimensional model using the inherent strain method based on the output distribution of the second inherent strain and obtaining a welding deformation and residual stress of the structure. It is characterized by that.

  In the evaluation method of the embodiment, the two-dimensional thermoelastic-plastic analysis means inputs the welded member of the welded portion of the structure and the material properties of the welded member, the welding heat input, the joint shape of the welded portion, the welding Based on the speed, the groove shape of the weld, the plate thickness, and the number of weld passes, a two-dimensional thermal elastic-plastic analysis of the weld is performed, and there is uniform heat input in the weld line direction of the weld. A step of obtaining a distribution of the first intrinsic strain in the plane of the weld in the two-dimensional model, and an intrinsic strain converting means, wherein the distribution of the first intrinsic strain in the obtained two-dimensional model is represented by the center of the weld line. A step of converting to a distribution of the first inherent strain at a cross section orthogonal to the weld line at the center of the weld line in the three-dimensional model when there is heat input, and an inherent strain distribution output means includes the converted tertiary Previous in original model A step of outputting a distribution of a second intrinsic strain in the longitudinal direction of the weld line of the weld based on the distribution of the first intrinsic strain; And a step of performing an inherent strain method elastic analysis of a three-dimensional model using an inherent strain method on the basis of the output distribution of the second inherent strain and determining a welding deformation and a residual stress of the structure; However, based on the input constraint strength of the structure, material properties of the welded and welded members of the welded portion, the number of weld passes, joint shape, plate thickness, heat input, groove shape, welding material And a step of evaluating welding deformation and residual stress of the structure.

  According to the present invention, analysis of welding deformation and residual stress is simple, and the evaluation accuracy can be improved.

It is a conceptual diagram for demonstrating the concept of the analysis apparatus of the welding deformation and welding residual stress of embodiment of this invention. It is a figure which shows an example of the two-dimensional thermoelastic-plastic analysis model of a structure. It is a figure which shows the three-dimensional finite element model of a structure. It is a block diagram which shows the structure of the analysis apparatus of the welding deformation of one Embodiment of this invention, and a welding residual stress. It is a figure which shows an example of the intrinsic strain distribution of the cross section of the XY direction from the center of a weld line. It is a figure which shows an example of the correction coefficient based on the combination of the joint shape of a welding part, welding heat input, the plate | board thickness of a welding part, welding speed, and the number of welding passes. It is a figure which shows an example of the inherent strain distribution in the center of the weld line direction of the welding part memorize | stored in distribution DB. It is a figure which shows an example of the distribution data of the intrinsic strain value extracted by the intrinsic strain distribution extraction part. It is a figure which shows the result of a three-dimensional intrinsic strain method elastic analysis. It is a flowchart for demonstrating the analysis of the welding deformation | transformation and residual stress by an analyzer. It is a conceptual diagram for demonstrating the concept of the analysis apparatus of the welding deformation of the Embodiment 2 of this invention, and a welding residual stress. It is a figure which shows an example of the intrinsic strain distribution of the X-axis direction from the center of the weld line in Embodiment 2. It is a conceptual diagram for demonstrating the concept of the analysis apparatus of the welding deformation of the Embodiment 3 of this invention, and a welding residual stress. It is a figure which shows an example of the inherent strain distribution of the longitudinal direction of the weld line in Embodiment 3. It is a conceptual diagram for demonstrating the concept of the evaluation apparatus which evaluates the analyzed welding deformation and welding residual stress. It is a flowchart for demonstrating evaluation of the welding deformation and residual stress by an evaluation apparatus.

(Concept of embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram for explaining the concept of a welding deformation and welding residual stress analysis apparatus according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a two-dimensional thermal elastic-plastic analysis model of a structure. FIG. 3 is a diagram illustrating a three-dimensional finite element model of a structure.

First, the concept of the embodiment will be described with reference to FIGS.
As shown in FIG. 1, this analysis apparatus 1 includes a two-dimensional thermal elastic-plastic analysis means 2 that performs analysis using FEM, an inherent strain conversion means 3 that converts a two-dimensional intrinsic strain into a three-dimensional intrinsic strain, a tertiary Inherent strain distribution output means 4 for outputting the original inherent strain distribution, 3D intrinsic strain method elastic analysis means 5 for performing analysis using the inherent strain method, Weld deformation / residual stress for outputting 3D welding deformation and residual stress And output means 6.

  As shown in FIG. 2, the two-dimensional thermoelastic-plastic analysis model 20 models a welded portion 21 of a structure and base materials 22 and 22 as a finite element model, and uses a generalized plane strain element as an element. Such a finite element model is modeled on an X-axis-Y-axis (hereinafter referred to as “XY”) plane, and it is assumed that heat input is uniform in the Z-axis direction.

  That is, the generalized plane strain element is a plane 31 perpendicular to the weld line Z0 at the center of the weld line Z0 of the weld 21 when considered in the three-dimensional elastic analysis model 30 that is sufficiently long in the weld line Z0 direction shown in FIG. It is close to the stress / strain state at. The two-dimensional thermoelastic-plastic analysis means 2 obtains the inherent strain of the cross section in the XY direction substantially equal to the inherent strain generated in the plane 31 perpendicular to the weld line Z0 at the center S of the weld line Z0. The heat input is performed at the center S of the weld line Z0.

  Further, the inherent strain obtained by the two-dimensional thermoelastic-plastic analysis is converted into basic data (hereinafter referred to as “basic inherent strain”) by the inherent strain converting means 3 for the inherent strain for three-dimensional analysis. Based on the strain distribution, the inherent strain distribution output means 4 obtains an inherent strain for three-dimensional elastic analysis in the longitudinal direction of the weld line Z0 (hereinafter referred to as “weld line inherent strain”).

  Then, based on the obtained basic inherent strain distribution for 3D analysis and weld line inherent strain distribution, the 3D inherent strain method elastic analysis means 5 performs the 3D intrinsic strain method elastic analysis, The welding deformation and residual stress are obtained, and the welding deformation / residual stress output means 6 outputs the displacement component of the obtained welding deformation and the stress component of the residual stress.

  Here, since the basic inherent strain distribution in the XY cross section and the weld line inherent strain distribution in the Z-axis direction are obtained in three dimensions, the three-dimensional intrinsic strain method elastic analysis means 5 uses the three-dimensional distribution. Elasticity analysis is performed by inputting the inherent strain as an elastic strain into the initial conditions of the three-dimensional elastic analysis model. As described above, for example, there is a natural strain method as a calculation method for giving the natural strain to the elastic analysis model as an elastic strain. The elastic analysis result obtained by the three-dimensional inherent strain method elastic analysis means 5 using the inherent strain method is output by the welding deformation / residual stress output means 6 as a displacement component of welding deformation or a stress component of residual stress.

(Embodiment 1)
FIG. 4 is a configuration block diagram showing the configuration of the welding deformation and welding residual stress analysis apparatus 10 according to an embodiment of the present invention.

  As shown in FIG. 4, an analysis device 10 that analyzes and evaluates weld deformation and residual stress of a structure includes a data input unit 11 that inputs data, and a two-dimensional thermoelastic-plastic analysis that performs two-dimensional thermoelastic-plastic analysis by FEM. Unit 12, a distribution database (hereinafter referred to as "distribution DB") 13 for storing distribution data based on condition data described later, and a correction coefficient database (hereinafter referred to as "correction coefficient DB" for storing correction coefficients based on condition data described later) 14), a correction coefficient extraction unit 15 that extracts a predetermined correction coefficient from the correction coefficient DB 14, an inherent strain conversion unit 16 that converts a two-dimensional intrinsic strain into a three-dimensional intrinsic strain, and an intrinsic strain for three-dimensional elastic analysis Specific strain distribution extraction unit 17 for extracting the three-dimensional elastic strain analysis unit 18 for performing the three-dimensional natural strain method elastic analysis using the natural strain method, Output unit 19 for outputting a distillate stress, a display unit 25 for displaying the stress component of the displacement components and residual stress of welding deformation.

The analysis device 10 of this embodiment analyzes welding deformation and residual stress of a structure to be analyzed based on data stored in the distribution DB 13 and the correction coefficient DB 14.
In addition, as an analysis target, for example, a welded portion of a general structure in addition to a casing portion of a gas turbine device, a welded portion of a rotor, and the like are also targeted.

  The data input unit 11 shown in FIG. 4 includes a member to be welded (for example, corresponding to the base materials 22 and 22 in FIG. 2) and a welding member (for example, the welding member in FIG. 2) set by a user. 23), data on conditions necessary for analysis of material physical properties, welding heat input, weld joint shape, welding speed, weld groove shape, plate thickness, and number of welding passes are input. The data input includes creating and designing the models of FIG. 2 and FIG. 3 composed of the above data in a computer using a computer aided design (CAD).

Here, the material physical properties are data such as the elastic coefficients, thermal conductivity, and thermal expansion coefficient of the base materials 22 and 22 and the welding member 23.
The welding heat input is a laser output of a laser that welds a welded portion.
The joint shape of the welded part is, for example, a joint shape condition such as a butt joint, a T joint, or a cross joint.
The welding speed is the moving speed of the laser beam.
The groove shape is a shape of a groove provided between the base materials 22 and 22 to be welded such as V shape and I shape.
The plate thickness is the thickness of the base materials 22 and 22 (thickness in the Y-axis direction in FIG. 2).
A welding pass is the number of lamination | stacking of the welding member 23 welded to the welding part 21, for example by multilayer welding etc. FIG.

The two-dimensional thermoelastic-plastic analysis unit 12 shown in FIG. 4 has the material properties of the welded members 22 and 22 and the welded member 23 of the welded part 21 and the weld heat input, and the joint shape of the welded part 21 input from the data input unit 11. Based on the combination of conditions, welding speed, groove shape of welded portion 21, plate thickness, number of welding passes, two-dimensional thermal elastic-plastic analysis by FEM is performed, and two-dimensional intrinsic strain values in the XY direction (Fig. Distribution of the two-dimensional inherent strain value generated on the plane 31 perpendicular to the direction of the weld line Z0 shown in FIG. 3 and including the center of the weld line Z0.
The data input unit 11 and the two-dimensional thermoelastic-plastic analysis unit 12 constitute the two-dimensional elastic-plastic analysis means 2 shown in FIG.

  FIG. 5 is a diagram showing an example of the inherent strain distribution of the cross section in the XY direction from the center of the weld line Z0, where ♦ indicates a case where a three-dimensional thermal elastic-plastic analysis is performed, and ◇ indicates a two-dimensional The case where thermal elastic-plastic analysis is performed is shown.

  In FIG. 5, the horizontal axis indicates the distance (X-axis direction) from the center S (see FIG. 3) of the weld line Z0 where heat is input. Indicate the inherent strain value by two-dimensional thermo-elasto-plastic analysis and three-dimensional thermo-elasto-plastic analysis for the structure with the vertical axis. Intrinsic strain value of the center S of the weld line Z0. The distribution of the inherent strain is represented by a ratio based on “0.9”. In FIG. 5, the distribution data of the inherent strain at the distance in the plus (for example, right of the paper surface shown in FIG. 2) direction of the X axis from the center S of the heat input welding line Z0 is shown. The distribution data of the inherent strain at the distance in the (left) direction shown in FIG. 2 has the same value distribution.

  Although the inherent strain distribution in FIG. 5 is a representative example, the relative strain distributions of the two-dimensional thermoelastic-plastic analysis and the three-dimensional thermoelastic-plastic analysis are substantially the same in the shape of the distribution, and the center S of the weld line Z0. As the value approaches, the difference in the inherent strain values tends to increase at a constant rate.

Therefore, by multiplying the intrinsic strain distribution calculated by the two-dimensional thermoelastic-plastic analysis unit 12 by a predetermined correction coefficient, the intrinsic strain distribution of the two-dimensional thermoelastic-plastic analysis is changed to the intrinsic strain distribution of the three-dimensional thermoelastic-plastic analysis. It is possible to match.
In addition, as data for determining the correction coefficient, the combination of the weld joint shape, weld heat input, weld plate thickness, weld speed, and number of weld passes in the input data becomes the data of the above-described conditions. It is.

  The correction coefficient DB 14 shown in FIG. 4 is a correction based on a combination of the above-described condition data, that is, the joint shape of the welded portion, the welding heat input, the plate thickness of the welded portion, the welding speed, and the number of welding passes among the input data described above. Store the coefficients.

  FIG. 6 is a diagram illustrating an example of a correction coefficient based on a combination of the joint shape of the welded portion, the welding heat input, the plate thickness of the welded portion, the welding speed, and the number of welding passes. In FIG. 6, the joint shape of the weld is “butt joint”, the welding heat input is “800 (J / cm)”, the plate thickness d of the weld is “15 (mm)”, and the welding speed is “ 5 (mm / s) ”and the correction coefficient when the number of welding passes is“ 3 ”is“ 1.2 ”.

  For example, “butt joint” and “T joint” are set as types of joint shapes. In addition, as the type of heat input, for example, “500 (J / cm)” to “1500 (J / cm)” are set every 100 (J / cm). Further, as the type of plate thickness, for example, “5 (mm)” to “50 (mm)” are set every 5 (mm). In addition, as the type of welding speed, for example, “1 (mm / s)” to “10 (mm / s)” is set every 1 (mm / s). For example, “1”, “3”, “6”, and “10” are set as the number of welding passes. The correction coefficient DB 14 stores correction coefficients set in advance based on a combination of these data.

  The correction coefficient extraction unit 15 illustrated in FIG. 4 calculates a correction coefficient based on a combination of the joint shape of the welded portion, welding heat input, plate thickness of the welded portion, welding speed, and number of welding passes input from the data input unit 11. It can be extracted from DB14.

4 inherently multiplies the two-dimensional intrinsic strain value (see FIG. 5) analyzed by the two-dimensional thermoelastic-plastic analysis unit 12 by the correction coefficient extracted by the correction coefficient extraction unit 15. Thus, the distribution data of the two-dimensional intrinsic strain value is converted into the distribution data of the three-dimensional basic intrinsic strain value.
The correction coefficient DB 14, the correction coefficient extraction unit 15, and the inherent strain conversion unit 16 constitute the inherent strain conversion unit 3 shown in FIG.

  The distribution DB 13 shown in FIG. 4 is a welding based on a combination of three-dimensional basic inherent strain values converted by the inherent strain conversion unit 16, joint shape of the welded portion, weld length, welding direction, and degree of constraint data. This is a database that stores a plurality of distribution data of weld line inherent strain values for three-dimensional elasticity analysis in the longitudinal direction of the line Z0. The distribution data of these inherent strain values for three-dimensional elasticity analysis includes a combination of three-dimensional inherent strain values (see Fig. 5), joint shape of the weld, weld length, welding direction, and constraint data. Based on this, a change in the distribution of the inherent strain value is obtained, and the obtained distribution data of the inherent strain value is stored in a database.

  FIG. 7 is a view showing an example of a weld line inherent strain distribution for three-dimensional elasticity analysis in the longitudinal direction (see FIG. 3) of the weld line Z0 of the welded portion stored in the distribution DB 13, and the mark “♦” is minus (see FIG. 7). Middle, -1000 (mm)) direction to plus (+1000 (mm) in the figure) the inherent strain distribution when welding is shown, ◇ is minus (+1000 (mm) in the figure) direction minus The inherent strain distribution when welding is performed in the direction (-1000 (mm) in the figure) is shown. In addition, the vertical axis represents the distribution of the inherent strain at the ratio of the inherent strain value of the weld line center S, the mark “♦”, and the mark “◇” based on “1”.

Although the inherent strain distribution of the weld line in FIG. 7 is a representative example, the inherent strain distribution in the longitudinal direction of the weld line Z0 of the welded portion tends to be an inverted U shape having a similar distribution shape. .
The distribution data of the weld line inherent strain value for elastic analysis is obtained by obtaining three-dimensional distribution data measured in advance by a combination of the above-mentioned conditions in the distribution DB 13 based on the combination of the above-mentioned conditions. It is stored in correspondence with the combination.

  The distribution data of the inherent strain value of the weld line for the three-dimensional elasticity analysis is such that the vertical axis is the inherent strain value and the horizontal axis is the distance from the center S of the weld line Z0 (see FIG. 3). The center S of the weld line Z0 is set to “0”, and the welding direction indicates a positive (for example, front of the paper surface shown in FIG. 3) direction and a negative (for example, the rear of the paper surface shown in FIG. 3) direction. In the distribution data of the inherent strain value for elastic analysis, as shown in FIG. 7, the welding direction can be obtained by combining the data of the joint shape of the same weld, the welding length, the welding direction, and the constraint strength of the structure. However, since the distribution of the inherent strain values is different between when welding from the minus direction to the plus direction and when welding from the plus direction to the minus direction, both cases where the welding directions are different are obtained in advance in the distribution DB 13 respectively. Remember.

Here, the welding length is a length for performing welding on the welded portion by the laser beam of the laser.
The welding direction indicates a case where welding is performed from the plus direction to the minus direction with the above-described welding line Z0 being “0”, and a case where welding is performed from the minus direction to the plus direction.
The strength of restraint of the structure indicates, for example, the strength of fixing the base materials 22 and 22 shown in FIG. 3 at one place or at several places.

Data of these conditions is instructed to be input by the data input unit 11. These condition data may be input at the start of analysis together with the above-described condition data such as material properties, or may be input when extracting the distribution data of the inherent strain value.
The inherent strain distribution extraction unit 17 shown in FIG. 4 is based on a combination of three-dimensional inherent strain values (see FIG. 5), joint shape of the weld, weld length, welding direction, and constraint strength conditions. Corresponding distribution data is extracted from the distribution DB 13. That is, in this embodiment, it is possible to obtain the distribution data of the inherent strain value in consideration of the difference in the data (parameters) of such conditions. The distribution DB 13 and the inherent strain distribution extraction unit 17 constitute the inherent strain distribution output means 4 shown in FIG.

FIG. 8 illustrates a three-dimensional elasticity analysis at the center of the weld line Z0 direction when there is heat input at the center of the weld line Z0 direction (see FIG. 3) of the welded portion extracted by the inherent strain distribution extraction unit 17. It is a figure which shows an example of distribution data of an intrinsic strain value.
In the distribution data shown in FIG. 8, the vertical axis is the inherent strain value, the horizontal axis is the distance from the center S of the weld line Z0 (see FIG. 3), and the center S of the weld line Z0 is positive (for example, shown in FIG. 3). This is distribution data in the case of welding from the front direction of the sheet to the minus direction (for example, after the sheet surface shown in FIG. 3). In the distribution data of this example, the intrinsic strain value at the welding start point (distance 1000 (mm)) at the center of the weld line is about 0.25, and the intrinsic strain value between the distances of about 400 (mm) and −400 (mm) is obtained. It is shown in an inverted U shape with a natural strain value of 0.1 at a welding end point (-1000 (mm)).

  The three-dimensional elasticity analysis unit 18 shown in FIG. 4 has a three-dimensional basic inherent strain value converted by the inherent strain conversion unit 16 and a three-dimensional weld line inherent strain value extracted by the inherent strain distribution extraction unit 17 (see FIG. 4). 8), a three-dimensional inherent strain method elastic analysis in FEM is performed to determine weld deformation and weld residual stress of the structure. The three-dimensional elastic analysis unit 18 constitutes the three-dimensional intrinsic strain method elastic analysis means 5 shown in FIG.

FIG. 9 is a diagram showing the results of three-dimensional intrinsic strain method elastic analysis. FIG. 9 shows the analysis result as a three-dimensional finite element model 30.
The welding deformation / residual stress output unit 19 shown in FIG. 4 generates and outputs a three-dimensional finite element model 30 from the result of the three-dimensional intrinsic strain method elastic analysis. That is, the welding deformation / residual stress output unit 19 generates and outputs a three-dimensional finite element model 30 (see FIG. 9) based on the displacement component of the welding deformation of the structure and the stress component of the welding residual stress, which are analysis results. In the three-dimensional finite element model 30, due to residual stress generated in the welded portion 21 during welding, the respective end portions of the base materials 22 and 22 (base materials on the right and left sides of the paper from the center of the weld line Z0). (End part) is bent in the direction of the arrow of the Y-axis, and shows a state of being deformed into a square shape.

  The display unit 25 is composed of a general liquid crystal display or the like, displays the three-dimensional finite element model 30 output from the welding deformation / residual stress output unit 19, and allows the user to recognize the welding deformation and residual stress of the structure. To. The welding deformation / residual stress output unit 19 and the display unit 25 constitute the welding deformation / residual stress output means 6 shown in FIG.

FIG. 10 is a flowchart for explaining analysis of welding deformation and residual stress of the analysis apparatus 10.
As shown in FIG. 10, first, data of conditions necessary for analysis from the data input unit 11 (material properties of welded members 22 and 22 of the welded part of the structure and the welded member 23, welding heat input, joints of the welded part) The shape, the welding speed, the groove shape of the welded portion, the plate thickness, the number of welding passes, the welding length, the welding direction, and the strength of restraint are input (step S101).

  Next, the two-dimensional thermo-elasto-plastic analysis unit 12 among the data of this condition, the material properties of the welded members 22 and 22 and the welding member 23 of the welded part of the structure, the welding heat input, the joint shape of the welded part, the welding Based on the combination of the speed, the groove shape of the welded portion, the plate thickness, and the number of welding passes, a two-dimensional thermal elastic-plastic analysis is performed by FEM to calculate two-dimensional inherent strain value distribution data (step S102).

  Further, the correction coefficient extraction unit 15 extracts a corresponding correction coefficient from the correction coefficient DB 14 based on the combination of the joint shape of the weld, welding heat input, welding speed, plate thickness, and number of welding passes (step S103), The inherent strain conversion unit 16 multiplies the distribution data of the two-dimensional intrinsic strain value calculated in step S102 by the correction coefficient extracted in step S103 to convert the distribution data to the three-dimensional basic inherent strain value (step S104). ).

  Next, the inherent strain distribution extraction unit 17 performs elastic analysis from the distribution DB 13 based on the combination of the converted three-dimensional basic inherent strain value, the joint shape of the weld, the weld length, the weld direction, and the strength of the constraint. The weld line inherent strain distribution data is extracted (step S105). By this series of analysis operations, three-dimensional basic inherent strain value distribution data in the XY plane of FIG. 3 (similar to the distribution data of the solid line in FIG. 5) and the longitudinal direction of the weld line Z0 in FIG. It is possible to obtain three-dimensional distribution data of the inherent strain value in the axial direction (distribution data in FIG. 8).

  Next, based on the distribution data of the basic intrinsic strain value and the weld line intrinsic strain value, a three-dimensional intrinsic strain method elastic analysis using the intrinsic strain method is performed to obtain welding deformation and residual stress (step S106). Further, the analysis result is displayed on the display unit 25 by the welding deformation / residual stress output unit 19 in which a three-dimensional finite element model 30 (see FIG. 9) is generated by the displacement component of the welding deformation and the stress component of the welding residual stress. (Step S107).

  As described above, in this embodiment, the distribution data of the three-dimensional intrinsic strain value in the XY plane and the distribution data of the three-dimensional intrinsic strain value in the Z-axis direction are obtained without performing the three-dimensional thermoelastic-plastic analysis. Based on these distribution data, the three-dimensional inherent strain method elastic analysis is performed to obtain the welding deformation and the residual stress. Therefore, the analysis of the welding deformation and the residual stress is simple, and the evaluation accuracy can be improved.

  In addition, in this embodiment, by considering the distribution of the inherent strain value that varies depending on various conditions, it is possible to analyze the welding deformation and residual stress in consideration of the influence of the welding direction and the strength of the restraint of the structure with high accuracy. It can be carried out.

(Embodiment 2)
FIG. 11 is a conceptual diagram for explaining the concept of the welding deformation and welding residual stress analysis apparatus 1 according to the second embodiment of the present invention.
As in FIG. 1, this analysis apparatus 1 includes a two-dimensional thermoelastic-plastic analysis means 2 for performing an analysis using FEM, an intrinsic strain conversion means 3 for converting a two-dimensional intrinsic strain into a three-dimensional intrinsic strain, a three-dimensional Intrinsic strain distribution output means 4 for outputting the inherent strain distribution, three-dimensional intrinsic strain method elastic analysis means 5 for performing analysis using FEM, and welding deformation / residual stress output means 6 for outputting three-dimensional welding deformation and residual stress. The inherent strain converting means 3 includes a weld stress triaxiality calculation unit 7 that calculates a ratio of stress triaxiality.

  This weld stress triaxiality calculation unit 7 includes a stress triaxiality T (hereinafter referred to as “T (2d)”) of the weld line Z0 of the weld 21 of the two-dimensional elastic analysis model shown in FIG. 3, the stress triaxiality T (hereinafter referred to as “T (3d)”) of the weld 21 at the center S of the weld line Z 0 of the three-dimensional elastic analysis model shown in FIG. 3d) / T (2d) is calculated.

Here, the stress triaxiality T of the welded portion indicates the degree to which the structure is restrained by the stress acting on the welded portion, and can be obtained as follows.
σ _m = (σ ₁ + σ ₂ + σ ₃ ) / 3 (1)
σ _eq = {[(σ ₁ -σ ₂ ) ² + (σ ₂ -σ ₃ ) ² + (σ ₃ -σ ₁ ) ² ] / 2} ^1/2 (2)
T = σ _m / σ _eq (3)
Σ ₁ , σ ₂ , and σ ₃ are the stress components of the elastic thermal stress, σ _m is the average value of these stress components, and σ _eq is the equivalent stress of these stress components (the sum of squares of the stress difference). It is.

Further, from the equation (3), T (2d) and T (3d) are
T (2d) = σ _m (2d) / σ _eq (2d)
T (3d) = σ _m (3d) / σ _eq (3d)
It is.

Therefore, the ratio [T (3d) / T (2d)] is
T (3d) / T (2d) = (σ _m (3d) / σ _eq (3d)) / (σ _m (2d) / σ _eq (2d)) (4)
It becomes.

  As described in the concept of the embodiment, the two-dimensional thermoelastic-plastic analysis model 20 models the welded portion 21 of the structure and the base materials 22 and 22 as a finite element model, and generalized plane strain as an element. Use elements. Such a finite element model is modeled on the XY plane, and it is assumed that the Z-axis direction has a sufficient length. Thus, the two-dimensional thermoelastic-plastic analysis model using the plane strain element is in the “plane strain state”.

In this plane strain state, the object (welded part) is subjected to the following stresses σ ₁ , σ ₂ , and σ ₃ .
σ ₁ = [E / (1 + ν)] [ε ₁ + ν (ε ₁ + ε ₂ ) / (1-2ν)]
σ ₂ = [E / (1 + ν)] [ε ₂ + ν (ε ₁ + ε ₂ ) / (1-2ν)]
σ ₃ = [E / (1 + ν)] [ν (ε ₁ + ε ₂ ) / (1-2ν)]
E is an elastic coefficient, ν is a Poisson's ratio, and ε ₁ and ε ₂ are strains obtained by analysis.

Thus, in this embodiment, in order to obtain the stress triaxiality T of the welded portion, the welded portion of the two-dimensional model shown in FIG. 2 (position corresponding to the weld line Z0 in FIG. 3) and FIG. An arbitrary constant temperature is applied to the welded portion of the three-dimensional model (position of the center S of the weld line Z0), elastic thermal stress analysis is performed by FEM, and stress components of the generated elastic thermal stress (first and second) The third principal stresses σ ₁ , σ ₂ , σ ₃ ) are used to calculate the equations (1) to (3), and the ratio of the obtained stress triaxiality T is calculated. The arbitrary constant temperature is, for example, that the temperature of the center S of the welding line Z0 is raised or lowered to a constant temperature not higher than the melting points of the base materials 22 and 22 and the welding member 23 shown in FIG. The two-dimensional and three-dimensional thermal stresses that are sometimes generated are obtained, and the ratio [T (3d) / T (2d)] is calculated from the equation (4).

  The ratio of stress triaxiality obtained in this way [T (3d) / T (2d)] is used as the coefficient of the inherent strain converting means 3. In other words, in this embodiment, the intrinsic strain conversion means 3 is subjected to stress triaxiality in the intrinsic strain value obtained by the two-dimensional thermoelastic-plastic analysis means 2 (the intrinsic strain value of the cross section in the XY direction shown in FIG. 2). By multiplying by a coefficient [T (3d) / T (2d)] which is a ratio of degrees, it is converted into a basic inherent strain value for three-dimensional analysis which is basic data. Based on this basic intrinsic strain value, the intrinsic strain distribution output means 4 obtains and outputs the weld line intrinsic strain distribution for three-dimensional elastic analysis.

  Further, based on the obtained basic intrinsic strain distribution and weld line intrinsic strain distribution, the three-dimensional intrinsic strain method elastic analysis means 5 performs three-dimensional intrinsic strain method elastic analysis, The residual stress is obtained, and the welding deformation / residual stress output means 6 outputs the displacement component of the obtained welding deformation and the stress component of the residual stress.

  FIG. 12 is a diagram showing an example of the inherent strain distribution in the X-axis direction from the center S of the weld line Z0 (see FIG. 3). The ♦ mark shows the inherent strain distribution when a three-dimensional thermoelastic-plastic analysis is performed. Indicated by ◇ are the inherent strain distributions obtained by multiplying the inherent strain value obtained by the two-dimensional thermoelastic-plastic analysis by the coefficient [T (3d) / T (2d)].

  In FIG. 12, the horizontal axis indicates the distance (X direction) from the center S (see FIG. 3) of the weld line Z0, and the two-dimensional thermal elastic-plastic analysis and the coefficient [T (3d) / T (2d)] and the inherent strain value obtained by three-dimensional thermal elastic-plastic analysis are shown. 12 shows the distribution data of the inherent strain at the distance in the plus direction (for example, to the right of the paper surface shown in FIG. 2) of the X axis from the center of the weld line, but the negative (for example, the paper surface shown in FIG. 2). The distribution data of the inherent strain at the distance in the (left) direction has the same distribution.

  From FIG. 12, the basic inherent strain distribution when the intrinsic strain value obtained by the two-dimensional thermoelastic-plastic analysis is multiplied by the coefficient [T (3d) / T (2d)] is obtained by performing the three-dimensional thermoelastic-plastic analysis. It can be seen that the distribution is almost the same as the intrinsic strain distribution.

  Note that the inherent strain distribution of FIG. 12 is a representative example. However, when the inherent strain value relatively obtained by the two-dimensional thermal elastic-plastic analysis is multiplied by a coefficient [T (3d) / T (2d)]. The intrinsic strain distribution and the intrinsic strain distribution when the three-dimensional thermoelastic-plastic analysis is performed have substantially the same distribution shape.

  Thus, in this embodiment, if the inherent strain distribution obtained by multiplying the inherent strain value obtained by the two-dimensional thermoelastic-plastic analysis by the coefficient [T (3d) / T (2d)] is used, the three-dimensional heat An inherent strain distribution equivalent to that obtained when the three-dimensional thermal elastic-plastic analysis is performed without performing the elastic-plastic analysis and without constructing the correction coefficient DB 14 (see FIG. 4) can be obtained.

  In this embodiment, the coefficient of the inherent strain value obtained by the two-dimensional elastic analysis is obtained from the stress triaxiality T indicating the degree to which the structure is constrained. The coefficient may be set from an analysis of the degree to which the structure is constrained.

(Embodiment 3)
FIG. 13 is a conceptual diagram for explaining the concept of the welding deformation and welding residual stress analysis apparatus 1 according to the third embodiment of the present invention. In this embodiment, as in the second embodiment, the coefficient [T (3d) / T (2d)], which is the ratio of the stress triaxiality between the two-dimensional thermoelastic-plastic analysis model and the three-dimensional elastic analysis model, is calculated. It shall be.

  Similar to FIG. 11, this analysis apparatus 1 includes a two-dimensional thermoelastic-plastic analysis means 2 that performs an analysis using FEM, a weld stress triaxial degree calculation unit 7 that calculates a coefficient, and a two-dimensional inherent strain that is three-dimensional. Intrinsic strain conversion means 3 for converting to intrinsic strain, Intrinsic strain distribution output means 4 for outputting a three-dimensional intrinsic strain distribution, Three-dimensional intrinsic strain method elastic analysis means 5 for performing analysis using FEM, Three-dimensional welding deformation, Welding deformation / residual stress output means 6 for outputting the residual stress is provided, and the inherent strain distribution output means 4 is a stress triaxiality T (Z) of the welded portion at each part of the weld line Z0 (see FIG. 3) of the welded portion. The weld stress for calculating the ratio [T (Z) / T (C)] of the stress triaxiality T (C) of the weld at the center S of the weld line Z0 (see FIG. 3) of the weld 21 A triaxial degree calculation unit 8 is included.

This weld stress triaxiality calculator 8 uses the stress components (first, second, and third principal stresses σ ₁ , σ ₂ , σ ₃ ) of the generated elastic thermal stress to express the equations shown in the second embodiment. Calculations of (1) to (3) are performed, and the ratio of the obtained stress triaxiality T is calculated.

Here, in order to obtain the stress triaxiality of the welded portion, which indicates the degree to which the structure is restrained, the welded portion of the three-dimensional elastic analysis model shown in FIG. An arbitrary constant temperature is applied to the center S), and elastic thermal stress analysis is performed by FEM. Stress components (first, second, and third principal stresses σ ₁ , σ ₂ , σ ₃ ) of the generated elastic thermal stress are performed. ) Is used to calculate the above formulas (1) to (3), and the ratio [T (Z) / T (C)] of the obtained stress triaxiality T is calculated.

That is, from equation (3), [T (C) and T (Z)] are
T (C) = σ _m (C) / σ _eq (C)
T (Z) = σ _m (Z) / σ _eq (Z)
It is.

Therefore, the ratio of stress triaxiality [T (Z) / T (C)] is
T (Z) / T (C) = (σ _m (Z) / σ _eq (Z)) / (σ _m (C) / σ _eq (C))
... (5)
It becomes.

  The ratio of stress triaxiality obtained in this way [T (Z) / T (C)] is used as a coefficient of the inherent strain distribution output means 4 for three-dimensional elastic analysis. That is, in this embodiment, by multiplying the basic inherent strain value for three-dimensional analysis obtained by the inherent strain converting means 3 by this coefficient [(T (Z) / T (C)], the weld line Z0. The weld line inherent strain distribution can be obtained.

  Further, based on the obtained basic intrinsic strain distribution and weld line intrinsic strain distribution, the three-dimensional intrinsic strain method elastic analysis means 5 performs three-dimensional intrinsic strain method elastic analysis, The residual stress is obtained, and the welding deformation / residual stress output means 6 outputs the displacement component of the obtained welding deformation and the stress component of the residual stress.

  FIG. 14 is a diagram showing an example of the inherent strain distribution in the longitudinal direction of the weld line Z0 in the third embodiment. The ◆ mark indicates the inherent strain distribution when a three-dimensional thermoelastic-plastic analysis is performed, and the ◇ mark is obtained. 3 shows an inherent strain distribution obtained by multiplying the obtained basic intrinsic strain value for elastic analysis by a coefficient [T (Z) / T (C)].

  In FIG. 14, the horizontal axis indicates the distance (X direction) from the center S (see FIG. 3) of the weld line Z0, and the two-dimensional thermal elastic-plastic analysis and the coefficient [T (3d) / T (2d)] and the inherent strain value obtained by three-dimensional thermal elastic-plastic analysis are shown. In the distribution data shown in FIG. 14, the vertical axis is the intrinsic strain value, the horizontal axis is the distance from the center S of the weld line Z0 (see FIG. 3), and the center S of the weld line Z0 is added (for example, FIG. 3). The distribution data in the case of welding from the front direction of the paper surface shown in Fig. 3 to the minus direction (for example, the rear side of the paper surface shown in FIG. 3).

  From FIG. 14, the intrinsic strain distribution when the basic intrinsic strain value for elastic analysis is multiplied by the coefficient [T (Z) / T (C)] is the intrinsic strain distribution when the three-dimensional thermoelastic-plastic analysis is performed. It can be seen that it almost matches.

  The inherent strain distribution in FIG. 14 is a representative example, but the coefficient [T (Z) / T (C)] is relatively added to the basic intrinsic strain value for elastic analysis obtained from the inherent strain distribution output means 4. The inherent strain distribution when multiplied by and the inherent strain distribution when the three-dimensional thermoelastic-plastic analysis is performed have substantially the same distribution shape.

  As described above, in this embodiment, the same effect as that of the second embodiment is obtained, and the basic inherent strain value obtained by the inherent strain distribution output unit 4 is multiplied by the coefficient [T (Z) / T (C)]. If the inherent strain distribution is used, the three-dimensional thermoelastic-plastic analysis is not performed, and the distribution DB 13 (see FIG. 4) for storing the distribution data of the weld line inherent strain values is not constructed, and the three-dimensional thermoelastic-plastic analysis is performed. An inherent strain distribution equivalent to that obtained by the analysis can be obtained.

  In other words, according to this embodiment, the welding sequence and direction, and the restraint of the structure can be controlled with high accuracy without considering the three-dimensional thermoelastic-plastic analysis and taking into account the inherent strain distribution that changes depending on various conditions. It is possible to provide an apparatus for analyzing welding deformation and residual stress in consideration of the influence of strength.

  In this embodiment, the coefficient of the basic inherent strain value obtained by the inherent strain distribution output means 4 is obtained from the stress triaxiality. However, the present invention is not limited to this, and structures other than the stress triaxiality are constrained. A coefficient may be set from the analysis of the degree.

(Embodiment 4)
FIG. 15 is a conceptual diagram for explaining the concept of the evaluation apparatus 40 for evaluating the analyzed welding deformation and welding residual stress.
As shown in FIG. 15, this evaluation apparatus 40 includes a two-dimensional thermal elastic-plastic analysis means 2 for performing an analysis using the FEM shown in FIG. 1, an inherent strain for converting a two-dimensional intrinsic strain into a three-dimensional intrinsic strain. Conversion means 3, inherent strain distribution output means 4 for outputting a three-dimensional inherent strain distribution, three-dimensional intrinsic strain method elastic analysis means 5 for performing analysis using FEM, welding deformation for outputting three-dimensional welding deformation and residual stress A residual stress output means 6 and a process optimization calculation means 41 and an optimum welding condition output means 42 are provided.

  The process optimization calculation means 41 shown in FIG. 15 includes the constraint strength of the structure, the material properties of the welded member and the welded member of the weld, the number of weld passes, the joint shape of the weld, the plate thickness of the structure, It uses heat, groove shape, welding material, etc. as parameters, and iterative calculation is performed by an optimization search function for the purpose of reducing welding deformation or residual stress. The process optimization calculation means 41 includes, for example, Isight (registered trademark) which is software that provides an optimization process for enabling integration into a target use environment in an engineering process such as CAD. .

  The optimum welding condition output means 42 outputs the optimum welding process condition at that time when the welding deformation or residual stress is less than or equal to the target value set by the process optimization calculating means 41.

FIG. 16 is a flowchart for explaining the evaluation of welding deformation and residual stress by the evaluation apparatus.
As shown in FIG. 10, first, data of conditions necessary for analysis from the data input unit 11 (material properties of welded members 22 and 22 of the welded part of the structure and the welded member 23, welding heat input, joints of the welded part) Shape, welding speed, groove shape of welded portion, plate thickness, number of welding passes, welding length, welding direction and restraint strength) and target welding deformation or residual stress is input ( Step S101), the two-dimensional thermoelastic-plastic analysis means 2 includes, among the data of this condition, the material properties of the welded members 22, 22 and the welded member 23 of the welded portion of the structure, the heat input, the joint shape of the welded portion, Based on the combination of the welding speed, the groove shape of the welded portion, the plate thickness, and the number of welding passes, a two-dimensional thermal elastic-plastic analysis by FEM is performed to calculate distribution data of a two-dimensional inherent strain value (step S102).

  Next, the inherent strain conversion means 3 extracts the corresponding correction coefficient from the correction coefficient DB 14 based on the combination of the joint shape of the weld, the welding heat input, the welding speed, the plate thickness, and the number of welding passes (step S103). ), The distribution data of the two-dimensional inherent strain value calculated in step S102 is multiplied by the correction coefficient extracted in step S103 to convert it into distribution data of the three-dimensional basic inherent strain value (step S104).

  Next, the inherent strain distribution output means 4 generates elasticity from the distribution DB 13 based on the combination of the converted three-dimensional basic inherent strain value, the joint shape of the weld, the weld length, the weld direction, and the constraint strength. Distribution data of the weld line inherent strain for analysis is extracted (step S105). By this series of analysis operations, three-dimensional basic inherent strain value distribution data in the XY plane of FIG. 3 (similar to the distribution data of the solid line in FIG. 5) and the longitudinal direction of the weld line Z0 in FIG. It is possible to obtain three-dimensional distribution data of the inherent strain value in the axial direction (distribution data in FIG. 8).

  Next, the three-dimensional intrinsic strain method elastic analysis means 5 performs a three-dimensional intrinsic strain method elastic analysis using the intrinsic strain method based on the distribution data of the basic intrinsic strain value and the weld line intrinsic strain value, The welding deformation and residual stress are obtained (step S106), and the analysis result is output from the welding deformation / residual stress output means 6 to the process optimization calculation means 41 in the welding deformation displacement component and the welding residual stress component. (Step S107).

  The process optimization calculation means 41 determines whether or not the input displacement component of welding deformation and the stress component of welding residual stress are equal to or less than the set target value (step S108). In the case of No in S108), change at least one of the parameters such as the constraint strength of the structure, material properties, number of welding passes, joint shape, plate thickness of the structure, heat input, groove shape, welding material, etc. (Step S109). In step S101, the changed parameter is input and the analysis operation is repeated.

  Further, when the input displacement component of welding deformation and the stress component of welding residual stress are equal to or less than the set target value (Yes in step S108), the optimum welding condition output means 42 causes the displacement component of this welding deformation. And a three-dimensional finite element model 30 (see FIG. 9) based on the stress component of the welding residual stress is generated and displayed (step S110).

  As described above, in this embodiment, the same effects as those of the first embodiment can be obtained, and since a three-dimensional thermal elastic-plastic analysis is not performed, it is possible to repeatedly perform an optimization condition search. Reasonably optimum welding process conditions can be obtained.

  In addition, this invention is not limited only to the said embodiment, You may change a component in the range which does not deviate from the summary in an implementation stage. In addition, various inventions can be configured by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 1 ... Analytical apparatus, 2 ... Two-dimensional thermoelastic-plastic analysis means, 3 ... Intrinsic strain conversion means, 4 ... Intrinsic strain distribution output means, 5 ... Intrinsic strain method elastic analysis means, 6 ... Weld deformation / residual stress output means, 7 , 8 ... weld triaxiality calculation unit, 10 ... analysis device, 11 ... data input unit, 12 ... two-dimensional thermal elastic-plastic analysis unit, 13 ... distribution DB, 14 ... correction coefficient DB, 15 ... correction coefficient extraction unit , 16 ... Intrinsic strain conversion section, 17 ... Intrinsic strain distribution extraction section, 18 ... Three-dimensional elastic analysis section, 19 ... Weld deformation / residual stress output section, 20 ... Two-dimensional thermoelastic-plastic analysis model, 21 ... Weld section, 22 , 22 ... welded member (base material), 23 ... welded member, 25 ... display unit, 30 ... three-dimensional elastic analysis model (three-dimensional finite element model), 31 ... plane, 40 ... evaluation device, 41 ... process optimization Calculation means, 42... Optimum welding condition output means, S Welding line center, Z0 ... weld line.

Claims (10)

Based on the input material to be welded and welded material of the structure, welding heat input, joint shape of the weld, welding speed, groove shape of the weld, plate thickness, number of weld passes Then, a two-dimensional thermal elastic-plastic analysis of the welded portion is performed, and a distribution of the first inherent strain in the plane of the welded portion in a two-dimensional model in the case where there is uniform heat input in the weld line direction of the welded portion is obtained. Two-dimensional thermoelastic-plastic analysis means,
The distribution of the first inherent strain in the obtained two-dimensional model is a first distribution in a cross section orthogonal to the weld line at the center of the weld line in the three-dimensional model when heat is input at the center of the weld line. An inherent strain conversion means for converting to an inherent strain distribution;
An inherent strain distribution output means for outputting a distribution of the second intrinsic strain in the longitudinal direction of the weld line of the weld based on the distribution of the first intrinsic strain in the transformed three-dimensional model;
Based on the obtained distribution of the first intrinsic strain and the output distribution of the second intrinsic strain, an intrinsic strain method elastic analysis of a three-dimensional model using the intrinsic strain method is performed, and the welding deformation of the structure And inherent strain method elastic analysis means for obtaining residual stress,
An analysis device comprising: The inherent strain converting means is
A storage unit that stores a correction coefficient corresponding to a combination of the joint shape of the weld, welding heat input, plate thickness, welding speed, and the number of welding passes;
A correction coefficient extraction unit that extracts the corresponding correction coefficient from the storage unit based on a combination of the joint shape of the weld to be input, welding heat input, plate thickness, welding speed, and the number of welding passes;
Conversion for multiplying the distribution of the first intrinsic strain of the two-dimensional model obtained by the two-dimensional thermoelastic-plastic analysis means and the extracted correction coefficient into the distribution of the first intrinsic strain of the three-dimensional model And
The analysis apparatus according to claim 1, further comprising: The inherent strain distribution output means includes
A storage unit for storing distribution data of the second intrinsic strain corresponding to a combination of the first intrinsic strain distribution data of the three-dimensional model, the joint shape of the weld, the weld length, the welding direction, and the strength of the constraint;
Based on the combination of the first inherent strain distribution of the input three-dimensional model, the joint shape of the weld, the weld length, the welding direction, and the strength of the constraint, the corresponding distribution data of the second inherent strain is A distribution extraction unit for extracting from the storage unit;
The analysis apparatus according to claim 1, further comprising: Welding deformation / residual stress output means for generating and outputting a three-dimensional finite element model of the structure based on the obtained welding deformation and residual stress of the structure;
The analyzer according to claim 1, further comprising: The inherent strain converting means is
Elastic thermal stress analysis when a constant temperature is applied to the weld of the two-dimensional model and elastic thermal stress when the constant temperature is applied to the weld at the center of the weld line of the three-dimensional model Analysis is performed to determine the stress component of the elastic thermal stress, and from the calculated stress component of the elastic thermal stress, the stress triaxiality at the weld of the two-dimensional model and the weld of the three-dimensional model A stress component calculation unit for calculating the stress triaxiality and its ratio at
Multiplication of the distribution of the first intrinsic strain of the two-dimensional model obtained by the two-dimensional thermoelastic-plastic analysis means and the ratio of the calculated triaxiality of the stress yields the first intrinsic strain of the two-dimensional model. A converter for converting the distribution into the distribution of the first intrinsic strain of the three-dimensional model;
The analysis apparatus according to claim 1, further comprising: The inherent strain distribution output means includes
Elastic thermal stress analysis when a constant temperature is applied to the weld of the two-dimensional model and elastic thermal stress when the constant temperature is applied to the weld at the center of the weld line of the three-dimensional model Analysis is performed to determine the stress component of the elastic thermal stress, and from the calculated stress component of the elastic thermal stress, the stress triaxiality at the weld of the two-dimensional model and the weld of the three-dimensional model A stress component calculation unit for calculating the stress triaxiality and its ratio at
Multiplying the distribution of the three-dimensional first inherent strain converted by the inherent strain converting means and the calculated ratio of the triaxiality of stress, the second inherent characteristic of the weld in the longitudinal direction of the weld line A distribution calculation unit for obtaining a strain distribution;
The analysis apparatus according to claim 1, further comprising: An analysis device according to claim 1;
Based on the input constraint strength of the structure, the material properties of the welded and welded members of the welded part, the number of weld passes, joint shape, plate thickness, heat input, groove shape, welding material, An evaluation means for evaluating weld deformation and residual stress of the structure;
An evaluation apparatus comprising: Welding deformation / residual stress output means for generating and outputting a three-dimensional finite element model of the structure based on the weld deformation and residual stress of the evaluated structure;
The evaluation apparatus according to claim 7, further comprising: The two-dimensional thermoelastic-plastic analysis means is inputted to the welded part of the welded part of the structure and material properties of the welded member, welding heat input, joint shape of the welded part, welding speed, groove shape of the welded part The two-dimensional thermal elastic-plastic analysis of the welded portion is performed based on the plate thickness and the number of welding passes, and the plane of the welded portion in the two-dimensional model when there is uniform heat input in the weld line direction of the welded portion Obtaining a distribution of the first intrinsic strain at
The inherent strain conversion means orthogonally crosses the distribution of the first inherent strain in the obtained two-dimensional model with the weld line at the center of the weld line in the three-dimensional model when there is heat input at the center of the weld line. Converting to a distribution of the first intrinsic strain in the cross section
A step of outputting a distribution of a second intrinsic strain in a longitudinal direction of a weld line of the weld, based on the distribution of the first intrinsic strain in the converted three-dimensional model;
The inherent strain method elasticity analysis means performs an inherent strain method elasticity analysis of the three-dimensional model using the inherent strain method based on the obtained distribution of the first intrinsic strain and the output distribution of the second intrinsic strain. Performing the step of obtaining welding deformation and residual stress of the structure,
The analysis method characterized by including. The two-dimensional thermoelastic-plastic analysis means is inputted to the welded part of the welded part of the structure and material properties of the welded member, welding heat input, joint shape of the welded part, welding speed, groove shape of the welded part The two-dimensional thermal elastic-plastic analysis of the welded portion is performed based on the plate thickness and the number of welding passes, and the plane of the welded portion in the two-dimensional model when there is uniform heat input in the weld line direction of the welded portion Obtaining a distribution of the first intrinsic strain at
The inherent strain conversion means orthogonally crosses the distribution of the first inherent strain in the obtained two-dimensional model with the weld line at the center of the weld line in the three-dimensional model when there is heat input at the center of the weld line. Converting to a distribution of the first intrinsic strain in the cross section
A step of outputting a distribution of a second intrinsic strain in a longitudinal direction of a weld line of the weld, based on the distribution of the first intrinsic strain in the converted three-dimensional model;
The inherent strain method elasticity analysis means performs an inherent strain method elasticity analysis of the three-dimensional model using the inherent strain method based on the obtained distribution of the first intrinsic strain and the output distribution of the second intrinsic strain. Performing the step of obtaining welding deformation and residual stress of the structure,
The evaluation means includes the input constraint strength of the structure, material properties of the welded and welded members of the welded portion, the number of weld passes, joint shape, plate thickness, heat input, groove shape, and welding material. On the basis of evaluating welding deformation and residual stress of the structure,
The evaluation method characterized by including.

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