CN109443948B - Creep performance test system and test method under high-temperature and high-pressure environment - Google Patents
Creep performance test system and test method under high-temperature and high-pressure environment Download PDFInfo
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- CN109443948B CN109443948B CN201811524387.5A CN201811524387A CN109443948B CN 109443948 B CN109443948 B CN 109443948B CN 201811524387 A CN201811524387 A CN 201811524387A CN 109443948 B CN109443948 B CN 109443948B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G01N2203/02—Details not specific for a particular testing method
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
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Abstract
The invention discloses a creep performance test system under a high-temperature and high-pressure environment, which comprises a test device and a control device, wherein the test device comprises a heating and pressurizing kettle, a strain gauge, an upper clamping unit and a lower clamping unit, the heating and pressurizing kettle comprises an upper kettle body and a lower kettle body, and the upper kettle body and the lower kettle body are provided with flexible parts; the control device comprises a controller, a signal processing module, an input module, a temperature sensor, a pressure sensor, a heating assembly, a pressurizing assembly, an upper driving module, a lower driving module and a display module. The invention also discloses a creep property test method under the high-temperature and high-pressure environment. The heating and pressurizing kettle is adopted, a high-temperature and high-pressure creep performance test environment can be provided for the test piece, the flexible portion can follow the displacement of the test piece, so that friction force is not generated between the sealing ring and the test piece, the influence on test stress is avoided, the measurement precision is improved, and a creep curve and an average creep curve of each strain gauge can be obtained in the creep performance test process.
Description
Technical Field
The invention belongs to the technical field of material tests, and particularly relates to a creep performance test system and a creep performance test method in a high-temperature and high-pressure environment.
Background
In a dissimilar metal welding joint at the safety end of a nuclear power primary circuit, a large amount of low alloy steel, nickel-based alloy steel and austenitic stainless steel are adopted, but the materials are easy to generate stress corrosion cracking in a severe service environment. Because the stress corrosion cracking is a crack slow expansion process under the combined action of a corrosion environment, a stress state and material performance, the welding material metal can creep in a high-temperature and high-pressure environment, so that the change of a crack tip stress and a strain field is caused, and the crack expansion rate of the crack corrosion cracking is further influenced. Therefore, the research on the creep law of the dissimilar metal welded joint at the safety end of the nuclear power primary circuit has important significance on the safety of nuclear power.
The creep test performed at present is an accelerated test method for performing tensile, compression, bending, creep and the like on a sample, mainly used for detecting and researching mechanical performance tests of static permanent tensile, creep, stress corrosion and the like of metal materials, nonmetals, composite materials and products thereof, and can be used for measuring the stress corrosion failure characteristic test of metals in medium environments such as NaOH, NO3-, H2S, CL-solution, methanol, N2O4, NH3, moisture air, water and the like, recording the tensile load born by the sample and the elongation of a gauge length section of the sample in real time, and determining the stress corrosion sensitivity and summarizing the creep rule of ductile materials under the condition that the stress corrosion cannot be rapidly excited by test methods such as constant load, constant deformation and the like.
When the creep process of a dissimilar metal welding joint at the safety end of a nuclear power primary circuit is researched under the high-temperature and high-pressure environment, the creep measurement method which is usually adopted is not suitable for being carried out under the high-temperature and high-pressure environment. Therefore, a device and a method for testing creep property of a dissimilar metal welding joint at the safety end of a nuclear power loop under a high-temperature and high-pressure environment are needed.
Disclosure of Invention
The invention aims to solve the technical problem that the defects in the prior art are overcome, and provides a creep performance test system and a creep performance test method under a high-temperature and high-pressure environment.
In order to solve the technical problems, the invention adopts the technical scheme that: a creep property test system under high temperature and high pressure environment is characterized in that: comprises a test device and a control device connected with the test device; the test device comprises a heating and pressurizing kettle, a strain gauge adhered to a test piece, an upper clamping unit and a lower clamping unit for clamping the test piece, a first lifting device for driving the upper clamping unit to move up and down and a second lifting device for driving the lower clamping unit to move up and down; the heating and pressurizing kettle comprises an upper kettle body and a lower kettle body mutually buckled with the upper kettle body, wherein the upper kettle body and the lower kettle body are respectively composed of a kettle body with a through hole at the top and a flexible part arranged at the position of the through hole, the flexible part is provided with a test through hole matched with the test piece, the upper kettle body and the lower kettle body are both of a double-layer hollow structure, heating components are arranged in hollow cavities of the upper kettle body and the lower kettle body, and a pressurizing cover and a quality adding cover are arranged on the upper kettle body; the controlling means include the controller, with timing module that the controller meets and with the signal processing module that the foil gage meets, the input termination of controller has input module, feedback module, is used for detecting the temperature sensor of temperature in the heating and pressurizing cauldron, is used for detecting the pressure sensor of heating and pressurizing cauldron internal pressure, is used for detecting go up the last range finding module of centre gripping unit displacement and be used for detecting the lower range finding module of centre gripping unit displacement down, the output termination of controller has warning module, heating element, pressure components, goes up drive module, drive module and display module down, the output of going up drive module and lower drive module all meets with feedback module.
The creep property test system under the high-temperature and high-pressure environment is characterized in that: first elevating gear includes base and top shoe, second elevating gear includes base and lower slider down, be provided with first slide rail and second slide rail down between base and the last base, top shoe and lower slider respectively with first slide rail, second slide rail sliding connection, drive module sets up under on the base and meets with the lower slider down, it sets up on last base and meets with the top shoe to go up drive module, centre gripping unit and lower slider fixed connection down, it sets up on the top shoe to go up the centre gripping unit.
The creep performance test system under the high-temperature and high-pressure environment is characterized in that: a connecting rod is arranged between the upper sliding block and the upper clamping unit, the connecting rod is fixedly connected with the upper clamping unit, and the upper sliding block is hinged to the connecting rod.
The creep performance test system under the high-temperature and high-pressure environment is characterized in that: and balancing rods are connected between the upper base and the upper sliding block and between the lower base and the lower sliding block, and are telescopic rods.
The creep performance test system under the high-temperature and high-pressure environment is characterized in that: the control device comprises a plurality of strain gauges, a signal processing module, a mean value calculation module and a difference value calculation module, wherein each strain gauge is connected with the signal processing module, the output end of the signal processing module is connected with the input end of the mean value calculation module and the input end of the difference value calculation module, the output end of the mean value calculation module is connected with the difference value calculation module, and the output end of the difference value calculation module is connected with the input end of a controller.
The invention also provides a method for testing the creep property, which has simple steps and is convenient to realize, and is characterized by comprising the following steps:
step one, selecting a tensile sample: selecting a tensile sample according to ASME standard;
step two, stretching the sample to a constant load position: setting an upper limit value of stretching time through an input module, respectively clamping two ends of a test piece by adopting an upper clamping unit and a lower clamping unit, and applying axial and radial loads to the test piece by adopting an upper driving module and a lower driving module, wherein the stretching speed is 0.005-0.01 mm/min, and the stretching time is not less than 500h;
step three, setting a high-temperature high-pressure test environment: taking the two ends of the test piece down from the upper clamping unit and the lower clamping unit respectively, sticking a plurality of strain gauges on different parts of the test piece respectively, putting the test piece into a heating and pressurizing kettle, enabling the test piece to extend out of the test through hole and to be matched and connected with a sealing ring, clamping the two ends of the test piece by the upper clamping unit and the lower clamping unit respectively, setting a temperature threshold value and a pressure threshold value through an input module, heating the heating and pressurizing kettle by a heating assembly, and pressurizing the heating and pressurizing kettle by a pressurizing assembly until the temperature threshold value and the pressure threshold value are reached;
step four, carrying out a creep property test:
step 401, setting an upper creep time limit value and an upper stress difference value limit value through an input module, applying axial and radial loads to a test piece by adopting an upper driving module and a lower driving module, wherein the tensile rate is 0.005-0.01 mm/min, the tensile time is not less than 500h, obtaining a stress test value by a strain gauge, obtaining a creep time test value by a timing module, and transmitting the creep time test value to a controller;
step 402, an average value calculation module calculates an average value of stress test values obtained by a plurality of strain gauges, a difference value calculation module calculates a difference value between the stress test value obtained by each strain gauge and the average value, a controller obtains a creep curve of each strain gauge according to the stress test value, obtains an average creep curve according to the average value of the stress test value, compares the difference value with an upper limit value of the stress difference value, if the difference value is smaller than the upper limit value of the stress difference value, the step 403 is executed, otherwise, the step 404 is executed;
step 403, the controller 1 compares the creep time test value with the creep time upper limit value, and when the creep time test value is greater than or equal to the creep time upper limit value, the test is finished, otherwise, the step 402 is returned to;
and step 404, the reminding module gives an alarm.
The above method is characterized in that: step three also comprises adding the test medium into the heating and pressurizing kettle through a mass adding cover.
Compared with the prior art, the invention has the following advantages:
1. the invention has simple structure, reasonable design and convenient realization, use and operation.
2. According to the invention, the upper kettle body and the lower kettle body are respectively provided with the flexible parts, the flexible parts are provided with the test through holes matched with the test piece, the seal rings are arranged in the test through holes, when the test piece deforms under the action of external force, the test piece drives the seal rings to displace, and the flexible parts are soft and bendable, so that the flexible parts are straightened in a natural bending state under the action of the external force transmitted by the seal rings, relative displacement does not occur between the seal rings and the test piece, friction force does not occur between the seal rings and the test piece, the influence on test stress is avoided, and the measurement precision is improved.
3. The heating and pressurizing kettle is adopted, and the heating and pressurizing kettle is provided with the heating assembly and the pressurizing cover, so that a high-temperature high-pressure creep property test environment can be provided for a test piece.
4. The invention can add test medium into the heating and pressurizing kettle through the mass adding cover, meets the test conditions of high-temperature and high-pressure corrosion environment, and has good applicability.
5. In the creep performance test process, the difference between the stress test values of the plurality of strain gauges and the average value is calculated in real time, when the difference is larger than or equal to the upper limit value of the stress difference, the fact that the tension on the test piece is uneven is considered, and a reminding module reminds a tester to carry out test review.
6. In the creep performance test process, the controller obtains the creep curve of each strain gauge according to the stress test value of each strain gauge received in the creep performance test process, obtains the average creep curve according to the average value of the stress test values received in the creep performance test process, and displays the average creep curve through the display module, so that the creep test device is convenient for workers to observe and use.
In conclusion, the heating and pressurizing kettle is adopted, a high-temperature and high-pressure creep property test environment can be provided for the test piece, the upper kettle body and the lower kettle body are respectively provided with the flexible parts, and the flexible parts can follow the displacement of the test piece, so that friction force is not generated between the sealing ring and the test piece, the influence on test stress is avoided, the measurement precision is improved, the creep curve and the average creep curve of each strain gauge can be obtained in the creep property test process, and the use effect is good.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic view of the structure of the autoclave of the present invention.
Fig. 3 is a schematic block diagram of the circuit of the present invention.
FIG. 4 is a flow chart of the method of the present invention.
Description of reference numerals:
1, a controller; 2-a temperature sensor; 3-an input module;
4-a pressure sensor; 5-strain gauge; 6-a signal processing module;
7-mean calculation module; 8-difference calculation module; 9-a heating assembly;
10-a pressurizing assembly; 11-a display module; 12-lower base;
13 — a first slide rail; 14-lower slide block; 15-upper slide block;
16-a second slide rail; 17-a connecting rod; 18-an upper clamping unit;
19-a lower clamping unit; 20-lower drive module; 21-heating and pressurizing the kettle;
22-test piece; 23-upper drive module; 24-upper base;
211, a lower kettle body; 212, feeding the kettle body; 213-pressure cover;
214-adding a mass cover; 215-flexible part, 25-timing module;
26-a reminder module; 27-balance bar, 28-feedback module.
Detailed Description
As shown in fig. 1, 2 and 3, the present invention comprises a testing device and a control device connected with the testing device; the test device comprises a heating and pressurizing kettle 21, a strain gauge 5 adhered to a test piece 22, an upper clamping unit 18 and a lower clamping unit 19 for clamping the test piece 22, a first lifting device for driving the upper clamping unit 18 to move up and down and a second lifting device for driving the lower clamping unit 19 to move up and down; the heating and pressurizing kettle 21 comprises an upper kettle body 212 and a lower kettle body 211 buckled with the upper kettle body 212, the upper kettle body 212 and the lower kettle body 211 are both composed of a kettle body with a through hole at the top and a flexible part 215 arranged at the position of the through hole, the flexible part 215 is provided with a test through hole matched with the test piece 22, the upper kettle body 212 and the lower kettle body 211 are both of a double-layer hollow structure, heating components 9 are arranged in hollow cavities of the upper kettle body 212 and the lower kettle body 211, and a pressurizing cover 213 and a quality adding cover 214 are arranged on the upper kettle body 212; the control device comprises a controller 1, a timing module 25 connected with the controller 1, and a signal processing module 6 connected with a strain gauge 5, wherein the input end of the controller 1 is connected with an input module 3, a feedback module 28, a temperature sensor 2 used for detecting the temperature in the heating and pressurizing kettle 21, a pressure sensor 4 used for detecting the pressure in the heating and pressurizing kettle 21, an upper distance measuring module 25 used for detecting the displacement of the upper clamping unit 18 and a lower distance measuring module 26 used for detecting the displacement of the lower clamping unit 19, the output end of the controller 1 is connected with a reminding module 26, a heating assembly 9, a pressurizing assembly 10, an upper driving module 23, a lower driving module 20 and a display module 11, and the output ends of the upper driving module 23 and the lower driving module 20 are connected with the feedback module 28.
In actual use, the dielectric cover 214 is provided with a through hole for passing a data line connected to the strain gauge 5.
In this embodiment, first elevating gear includes upper base 24 and upper slide 15, second elevating gear includes lower base 12 and lower slider 14, be provided with first slide rail 13 and second slide rail 16 between lower base 12 and the upper base 24, upper slide 15 and lower slider 14 respectively with first slide rail 13, second slide rail 16 sliding connection, drive module 20 sets up on lower base 12 and meets with lower slider 14 down, it meets with upper slide 15 to go up drive module 23 and set up on upper base 24, clamping unit 19 and lower slider 14 fixed connection down, it sets up on upper slide 15 to go up clamping unit 18.
During the in-service use, open last cauldron body 212 and lower cauldron body 211, pass test through-hole with test piece 22, then with last cauldron body 212 and lower cauldron body 211 lock, the both ends of the test piece 22 that stretches out the test through-hole are held by last clamping unit 18 and lower clamping unit 19, controller 1 drive first elevating gear and/or second elevating gear, clamping unit 18 moves along the length direction of first slide rail 13 and second slide rail 16 in first elevating gear drives, clamping unit 19 moves along the length direction of first slide rail 13 and second slide rail 16 under the second elevating gear drive, thereby provide the pulling force to test piece 22.
When the upper driving module 23 and/or the lower driving module 20 drive the test piece 22 to deform, the feedback module 28 receives a working signal of the upper driving module 23 and/or the lower driving module 20 and transmits the working signal to the controller 1, the controller 1 sends a control signal to the timing module 25, the timing module 25 performs timing, when the timing duration of the timing module 25 is equal to the timing set value input through the input module 3, the controller 1 stops driving the first lifting device and/or the second lifting device, and the test is finished.
During the in-service use, last cauldron body 212 and cauldron body 211 are the half-circular arc cauldron body down, last cauldron body 212 and cauldron body 211 down all have flexible portion 215, offer on the flexible portion 215 with the experimental through-hole of test piece 22 looks adaptation, be provided with the sealing washer in the experimental through-hole. When the test piece 22 takes place deformation under the exogenic action, the test piece 22 drives the sealing washer and takes place the displacement, because flexible portion 215 is soft flexible, so flexible portion 215 is receiving by the exogenic action that the sealing washer transmitted, by natural bending state straightened, flexible portion 215 follows the test piece 22 motion promptly, consequently, relative displacement does not take place between sealing washer and the test piece 22, can not produce frictional force between seal ring and the test piece 22, do not influence the stress test result of test piece 22, and can not influence the sealed effect of sealing washer, excellent in use effect.
In actual use, a temperature set value, a pressure set value and a timing set value can be input through the input module 3.
The temperature sensor 2 is used for detecting the temperature in the heating and pressurizing kettle 21 and transmitting the collected temperature to the controller 1, the controller 1 compares the temperature in the heating and pressurizing kettle 21 collected by the temperature sensor 2 with a temperature set value, when the temperature in the heating and pressurizing kettle 21 collected by the temperature sensor 2 is smaller than the temperature set value, the controller 1 drives the heating assembly 9 to work, the heating assembly 9 starts to heat, and when the temperature in the heating and pressurizing kettle 21 collected by the temperature sensor 2 is larger than the temperature set value, the heating assembly 9 stops heating.
The pressure sensor 4 is used for detecting the pressure in the heating and pressurizing kettle 21 and transmitting the acquired pressure to the controller 1, the controller 1 compares the pressure in the heating and pressurizing kettle 21 acquired by the pressure sensor 4 with a pressure set value, when the pressure in the heating and pressurizing kettle 21 acquired by the pressure sensor 4 is smaller than the pressure set value, the controller 1 drives the pressurizing assembly 10 to work, the pressurizing assembly 10 starts to pressurize the heating and pressurizing kettle 21, and when the pressure in the heating and pressurizing kettle 21 acquired by the pressure sensor 4 is larger than the pressure set value, the pressurizing assembly 10 stops pressurizing.
In this embodiment, the number of the strain gauges 5 is multiple, each strain gauge 5 is connected to the signal processing module 6, the control device further includes a mean value calculating module 7 and a difference value calculating module 8, an output end of the signal processing module 6 is connected to an input end of the mean value calculating module 7 and an input end of the difference value calculating module 8, an output end of the mean value calculating module 7 is connected to the difference value calculating module 8, and an output end of the difference value calculating module 8 is connected to an input end of the controller 1.
In actual use, the controller 1 drives the upper driving module 23, the lower driving module 20, or drives the upper driving module 23 and the lower driving module 20 at the same time, the upper driving module 23 drives the upper clamping unit 18 to move, and the lower driving module 20 drives the lower clamping unit 19 to move, so as to provide external force to the test piece 22. The strain gauge 5 on the test piece 22 obtains a detected tension value of the corresponding position of the test piece 22 through the signal processing module 6, and transmits the detected tension value to the mean value calculating module 7 and the difference value calculating module 8 respectively, the mean value calculating module 7 calculates to obtain a mean value tension value according to the obtained detected tension value of each strain gauge 5, and transmits the mean value tension value to the difference value calculating module 8; the difference calculation module 8 performs difference calculation on the received detected tension value of each strain gauge 5 and the mean tension value calculated by the mean calculation module 7 to obtain a tension difference value, and transmits the tension difference value to the controller 1. In the measuring process, the controller 1 sends the detected tension value, the mean tension value calculated by the mean calculating module 7 and the tension difference value calculated by the difference calculating module 8 to the display module 11, so that the working personnel can know the test content in time.
In this embodiment, a connecting rod 17 is disposed between the upper slider 15 and the upper clamping unit 18, the connecting rod 17 is fixedly connected to the upper clamping unit 18, and the upper slider 15 is hinged to the connecting rod 17. In practical use, the upper slide block 15 is hinged with the connecting rod 17, so that the position of the upper clamping unit 18 can be moved, the use is flexible, and the clamping is convenient.
In this embodiment, balancing rods 27 are connected between the upper base 24 and the upper slider 15 and between the lower base 12 and the lower slider 14, and the balancing rods 27 are telescopic rods. In practical use, at least two balance rods 27 are arranged between the upper base 24 and the upper sliding block 15, at least two balance rods 27 are arranged between the lower base 12 and the lower sliding block 14, and the balance rods 27 are arranged to prevent the upper sliding block 15 or the lower sliding block 14 from losing balance.
In this embodiment, a connecting member and a sealing ring are arranged between the upper kettle body 212 and the lower kettle body 211. In actual use, the connecting piece is a buckle.
In this embodiment, the pressurizing assembly 10 is a pressurizing pump.
In this embodiment, the heating component 9 is a heating resistance wire.
In this embodiment, the upper driving module 23 and the lower driving module 20 are both pneumatic driving modules.
In this embodiment, the flexible portion 215 is made of fluororubber. In practical use, the fluororubber is made of tetrapropylene fluororubber which can resist high temperature of more than 250 ℃ and high pressure of 100MPa and resist water vapor.
As shown in FIG. 4, the present invention further includes a creep property testing method under high temperature and high pressure environment, which comprises the following steps:
step one, selecting a tensile sample: tensile specimens were selected according to ASME standards. During practical use, the test piece 22 comprises a gauge length section part, transition parts connected to two ends of the gauge length section part, and clamping parts respectively connected with the transition parts, the length of each clamping part is not less than two thirds of the effective clamping length of the upper clamping unit 18 or the lower clamping unit 19, and the gauge length section part is a cylinder with the cross section diameter not less than 5 mm.
Step two, stretching the sample to a constant load position: the upper limit value of the stretching time is set through the input module 3, the upper clamping unit 18 and the lower clamping unit 19 are adopted to clamp two ends of the test piece 22 respectively, the upper driving module 23 and the lower driving module 20 are adopted to apply axial and radial loads to the test piece 22, the stretching speed is 0.005-0.01 mm/min, and the stretching time is not less than 500h. In practice, the load is equal to the product of the cross-sectional area and the stress of the gauge section of the test specimen 22. At this stage the test piece 22 underwent an elastic stage and a plastic stage, with a tensile rate of 0.01mm/min.
Step three, setting a high-temperature high-pressure test environment: the two ends of a test piece 22 are respectively taken down from an upper clamping unit 18 and a lower clamping unit 19, a plurality of strain gauges 5 are respectively adhered to different parts of the test piece 22, the test piece 22 is placed into a heating and pressurizing kettle 21, the test piece 22 extends out of the test through hole and is in fit connection with the sealing ring, the upper clamping unit 18 and the lower clamping unit 19 respectively clamp the two ends of the test piece 22, a temperature threshold value and a pressure threshold value are set through an input module 3, the heating component 9 heats the heating and pressurizing kettle 21, and the pressurizing component 10 pressurizes the heating and pressurizing kettle 21 until the temperature threshold value and the pressure threshold value are reached. When the device is actually used, the temperature threshold is not more than 360 ℃, the pressure threshold is not more than 18MPa, and a test medium can be added into the heating and pressurizing kettle 21 through the mass adding cover 214, so that the test condition of a high-temperature and high-pressure corrosion environment is met, and the applicability is good.
Step four, carrying out a creep property test:
step 401, setting an upper creep time limit value and an upper stress difference value limit value through the input module 3, applying axial and radial loads to the test piece 22 by adopting the upper driving module 23 and the lower driving module 20, wherein the tensile rate is 0.005-0.01 mm/min, the tensile time is not less than 500h, obtaining a stress test value by the strain gauge 5, obtaining a creep time test value by the timing module 25, and transmitting the creep time test value to the controller 1. In actual use, the creep performance test is ended under the condition that the creep time test value is greater than or equal to the creep time upper limit value.
Step 402, the average value calculating module 7 calculates an average value of stress test values obtained by the plurality of strain gauges 5, the difference value calculating module 8 calculates a difference value between the stress test value obtained by each strain gauge 5 and the average value, the controller 1 obtains a creep curve of each strain gauge 5 according to the stress test value, obtains an average creep curve according to the average value of the stress test value, the controller 1 compares the difference value with an upper limit value of the stress difference value, if the difference value is smaller than the upper limit value of the stress difference value, the step 403 is executed, otherwise, the step 404 is executed. In actual use, in the creep performance test process, the difference between the stress test value and the average value of the plurality of strain gauges 5 is calculated in real time, and when the difference is greater than or equal to the upper limit value of the stress difference, the tension on the test piece 22 is considered to be uneven, so that the step 404 is performed, and a tester is reminded to perform test review through the reminding module 26.
And step 403, the controller 1 compares the creep time test value with the creep time upper limit value, and when the creep time test value is greater than or equal to the creep time upper limit value, the test is ended, otherwise, the process returns to the step 402. The creep performance test finishing condition is that the creep time test value is larger than or equal to the creep time upper limit value, the controller 1 obtains the creep curve of each strain gauge 5 according to the stress test value of each strain gauge 5 received in the creep performance test process, obtains the average creep curve according to the average value of the stress test values received in the creep performance test process, and displays the average creep curve through the display module 11, so that a worker can conveniently observe and use the creep performance test finishing condition. In practical use, the strain limit of the strain gauge 5 is 2%, the strain limit refers to the maximum deformation of the strain gauge 5, the resistance wire inside the strain gauge 5 is broken beyond the deformation to cause open circuit, and therefore the strain gauge cannot be used continuously, the minimum expression unit of the strain is um/m, and 2% represents 0.02 ^ 10^6 um/m, namely 20000 microstrain.
And step 404, the reminding module 26 gives an alarm. When the difference is greater than or equal to the upper limit of the stress difference, it is determined that the tension on the test piece 22 is not uniform, and therefore the process proceeds to step 404, and the reminding module 26 reminds the tester to perform a test review.
The above embodiments are only examples of the present invention, and are not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (8)
1. The creep performance test system under the high-temperature and high-pressure environment is characterized in that: comprises a test device and a control device connected with the test device; the test device comprises a heating and pressurizing kettle (21), a strain gauge (5) adhered to a test piece (22), an upper clamping unit (18) and a lower clamping unit (19) for clamping the test piece (22), a first lifting device for driving the upper clamping unit (18) to move up and down and a second lifting device for driving the lower clamping unit (19) to move up and down; the heating and pressurizing kettle (21) comprises an upper kettle body (212) and a lower kettle body (211) buckled with the upper kettle body (212), the upper kettle body (212) and the lower kettle body (211) are both composed of a kettle body with a through hole at the top and a flexible part (215) arranged at the position of the through hole, a test through hole matched with the test piece (22) is formed in the flexible part (215), the upper kettle body (212) and the lower kettle body (211) are both of a double-layer hollow structure, heating components (9) are arranged in hollow cavities of the upper kettle body (212) and the lower kettle body (211), and a pressurizing cover (213) and a quality adding cover (214) are arranged on the upper kettle body (212); the control device comprises a controller (1), a timing module (25) connected with the controller (1), and a signal processing module (6) connected with a strain gauge (5), wherein the input end of the controller (1) is connected with an input module (3), a feedback module (28), a temperature sensor (2) for detecting the temperature in the heating and pressurizing kettle (21), a pressure sensor (4) for detecting the pressure in the heating and pressurizing kettle (21), a distance measuring module (25) for detecting the displacement of the upper clamping unit (18) and a distance measuring module (26) for detecting the displacement of the lower clamping unit (19), the output end of the controller (1) is connected with a reminding module (26), a heating assembly (9), a pressurizing assembly (10), an upper driving module (23), a lower driving module (20) and a display module (11), and the output ends of the upper driving module (23) and the lower driving module (20) are connected with the feedback module (28).
2. The creep performance testing system in high temperature and high pressure environment according to claim 1, wherein: first elevating gear includes upper base (24) and top shoe (15), second elevating gear includes lower base (12) and lower slider (14), be provided with first slide rail (13) and second slide rail (16) between lower base (12) and upper base (24), top shoe (15) and lower slider (14) respectively with first slide rail (13), second slide rail (16) sliding connection, drive module (20) set up under on base (12) and meet with lower slider (14), it sets up on upper base (24) and meets with top shoe (15) to go up drive module (23), centre gripping unit (19) and lower slider (14) fixed connection down, it sets up on top shoe (15) to go up centre gripping unit (18).
3. The creep performance testing system in a high temperature and high pressure environment according to claim 2, wherein: a connecting rod (17) is arranged between the upper sliding block (15) and the upper clamping unit (18), the connecting rod (17) is fixedly connected with the upper clamping unit (18), and the upper sliding block (15) is hinged to the connecting rod (17).
4. The creep performance testing system in a high temperature and high pressure environment according to claim 2, wherein: and balance rods (27) are connected between the upper base (24) and the upper sliding block (15) and between the lower base (12) and the lower sliding block (14), and the balance rods (27) are telescopic rods.
5. The creep performance testing system in high temperature and high pressure environment according to claim 1, wherein: the quantity of foil gage (5) is a plurality of, and every foil gage (5) meets with signal processing module (6) respectively, controlling means still includes mean value calculation module (7) and difference calculation module (8), the output of signal processing module (6) meets with the input of mean value calculation module (7) and the input of difference calculation module (8) respectively, the output and the difference calculation module (8) of mean value calculation module (7) meet, the output and the input of controller (1) of difference calculation module (8) meet.
6. A method for testing creep performance using the testing system of claim 5, the method comprising the steps of:
step one, selecting a tensile sample: selecting a tensile sample according to ASME standard;
step two, stretching the sample to a constant load position: setting the upper limit value of the stretching time through the input module (3), respectively clamping two ends of a test piece (22) by using an upper clamping unit (18) and a lower clamping unit (19), and applying axial and radial loads to the test piece (22) by using an upper driving module (23) and a lower driving module (20), wherein the stretching speed is 0.005-0.01 mm/min, and the stretching time is not less than 500h;
step three, setting a high-temperature high-pressure test environment: taking the two ends of a test piece (22) down from an upper clamping unit (18) and a lower clamping unit (19), respectively sticking a plurality of strain gauges (5) on different parts of the test piece (22), putting the test piece (22) into a heating and pressurizing kettle (21), enabling the test piece (22) to extend out of the test through hole and to be matched and connected with a sealing ring, respectively clamping the two ends of the test piece (22) by the upper clamping unit (18) and the lower clamping unit (19), setting a temperature threshold value and a pressure threshold value through an input module (3), heating the heating and pressurizing kettle (21) by a heating assembly (9), and pressurizing the heating and pressurizing kettle (21) by a pressurizing assembly (10) until the temperature threshold value and the pressure threshold value are reached;
step four, carrying out a creep property test:
step 401, setting an upper limit value of creep time and an upper limit value of a stress difference value through an input module (3), applying axial and radial loads to a test piece (22) by adopting an upper driving module (23) and a lower driving module (20), wherein the tensile rate is 0.005-0.01 mm/min, the tensile time is not less than 500h, obtaining a stress test value by a strain gauge (5), obtaining a creep time test value by a timing module (25), and transmitting the creep time test value to a controller (1);
step 402, an average value calculation module (7) calculates an average value of stress test values obtained by a plurality of strain gauges (5), a difference value calculation module (8) calculates a difference value between the stress test value obtained by each strain gauge (5) and the average value, a controller (1) obtains a creep curve of each strain gauge (5) according to the stress test values, obtains an average creep curve according to the average value of the stress test values, the controller (1) compares the difference value with an upper limit value of the stress difference value, if the difference value is smaller than the upper limit value of the stress difference value, step 403 is executed, otherwise, step 404 is executed;
step 403, the controller 1 compares the creep time test value with the creep time upper limit value, and when the creep time test value is greater than or equal to the creep time upper limit value, the test is finished, otherwise, the step 402 is returned to;
and step 404, the reminding module (26) gives an alarm.
7. The method of claim 6, wherein: step three also comprises adding test media into the heating autoclave (21) through a quality adding cover (214).
8. The method of claim 6, wherein: in the third step, the temperature threshold is not more than 360 ℃, and the pressure threshold is not more than 18MPa.
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