JP2015190955A - FRP strength diagnostic apparatus and FRP strength diagnostic method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an FRP strength diagnostic apparatus and a diagnostic method thereof which can diagnose the strength of a thick wall part of FRP (Fiber Reinforced Plastics) objectively.SOLUTION: An FRP strength diagnostic apparatus 10 for diagnosing the strength of a thick wall part 70 of FRP comprises: an ultrasonic array sensor 11 which transmits and receives an ultrasonic wave to/from the thick wall part 70 being an inspection object; an ultrasonic flaw detection part 30 which transmits and receives the ultrasonic wave to/from the ultrasonic array sensor 11 in the phased array method; a sound wall thickness and deteriorated portion calculation part 40 which calculates the sound wall thickness, sound area ratio and corrosion depth of the thick wall part 70 of the FRP on the basis of information on reception of the ultrasonic wave obtained by the ultrasonic flaw detection part 30; an evaluation storage part 50 which stores the evaluation rank of the deterioration of the FRP associated with the sound area ratio of the thick wall part 70 of the FRP; a deterioration evaluation part 60 which performs evaluation ranking of the corrosion of the thick wall part 70 being the inspection object on the basis of the sound wall thickness and corrosion depth obtained by the sound wall thickness and deteriorated portion calculation part 40 and the evaluation rank; and a display part 80 which displays the strength diagnosis result.

Description

  The present invention relates to an FRP intensity diagnostic apparatus and an FRP intensity diagnostic method using the same.

  In recent years, containers and tanks (hereinafter simply referred to as tanks) using fiber reinforced plastics (hereinafter referred to as FRP) have been used. Such tanks are a combination of ultraviolet rays from the outside and chlorine gas from chemicals etc. stored inside, and the wall or bottom wall of the tank or the like is cracked by peeling or reducing the wall thickness. (For example, refer nonpatent literature 1).

Therefore, tanks and the like need to be periodically inspected for the degree of FRP degradation so that such problems do not occur. As a method of inspecting the degree of deterioration, it is determined by a sound hitting inspection method that is determined by a sound when an inspector strikes a thick part, a surface color of a thick part of the inspector, a watermark color that is transparent, or the like. A visual inspection method is adopted. However, the inspection method is greatly influenced by the skill of discriminating the sound of the inspector and the skill of identifying the color.
Therefore, an FRP erosion inspection apparatus that inspects the erosion depth of the thick portion of the FRP has been developed (see Non-Patent Document 2). In this FRP erosion inspection, an ultrasonic array sensor that transmits and receives ultrasonic waves to a thick part to be inspected, and measurement data obtained by transmitting and receiving ultrasonic waves to and from the ultrasonic array sensor by a phased array method are used. Display as an image.

Labor base station basic safety departure 0111 No. 2 (available at http://www.jaish.gr.jp/anzen/hor/hombun/hor1-53/hor1-53-1-1-1.htm) 11th Maintenance Inspection Symposium Proceedings, FRP ultrasonic flaw detection, announced on November 15, 2012

  However, in the FRP erosion inspection apparatus described in Non-Patent Document 2, only the deteriorated layer and the healthy layer among the cross-sectional layers of the thick part such as the tank are displayed as images, and the inspector displays It is necessary to visually inspect the thickness of the deteriorated layer and make an inspection decision on the tank or the like. Even in the inspection method, the inspection decision is greatly influenced by the skill of the inspector.

  Then, the subject of this invention is providing the FRP intensity | strength diagnostic apparatus which can test | inspect the erosion depth of the thick part of FRP objectively, and its inspection method.

The FRP intensity diagnostic apparatus according to the present invention is the following intensity diagnostic apparatus for diagnosing the intensity of the thick part of the FRP.
[1] An FRP intensity diagnostic apparatus includes an ultrasonic array sensor that transmits and receives ultrasonic waves to a thick portion to be inspected, and an ultrasonic wave that transmits and receives ultrasonic waves to and from the ultrasonic array sensor using a phased array method. A flaw detection unit and a sound thickness and deterioration portion calculation unit that calculates a sound thickness, a healthy area ratio, and an erosion depth of a thick part of the FRP based on information of ultrasonic reception obtained by the ultrasonic flaw detection unit And an evaluation storage unit that stores an evaluation rank of FRP degradation associated with an erosion depth and a healthy area ratio of the thick part of the FRP, and a healthy thickness obtained by the healthy thickness and the degraded part calculation unit. A deterioration evaluation unit that ranks the erosion of the thick portion to be inspected based on the evaluation depth, the erosion depth, the healthy area ratio, and the evaluation storage unit; and a display unit that displays the evaluation result of the deterioration evaluation unit With.

[2] The deterioration evaluation unit further determines whether or not the thick portion to be inspected is missing in the lattice image obtained based on the reception information of the ultrasonic wave obtained by the ultrasonic flaw detection unit. The FRP intensity diagnosis apparatus according to [1], wherein when it is determined that there is a lack, the evaluation ranking of the erosion of the thick portion to be inspected is performed.
[3] The FRP intensity diagnostic apparatus according to [1] or [2], wherein the display unit further displays, as an image, ultrasonic reception information obtained by the ultrasonic flaw detection unit.
[4] The evaluation storage unit according to any one of [1] to [3], in which the evaluation storage unit stores in advance an evaluation calculated from a relationship between a deteriorated FRP state and the bending strength of the deteriorated FRP. FRP intensity diagnostic device.

[5] A FRP intensity diagnostic method using the FRP intensity diagnostic apparatus according to any one of [1] to [4].

  ADVANTAGE OF THE INVENTION According to this invention, the FRP intensity | strength diagnostic apparatus which can diagnose the intensity | strength of FRP which deteriorated objectively, and its diagnostic method can be provided.

It is a block diagram which shows the structure of the FRP intensity diagnostic apparatus which concerns on this invention. It is a flowchart of the FRP intensity diagnostic apparatus shown in FIG.

  As shown in FIG. 1, an FRP intensity diagnostic apparatus 10 according to the present invention is in contact with an outer peripheral surface 72 of a thick portion 70 of an FRP to be inspected, and an ultrasonic array sensor 11 that transmits and receives ultrasonic waves. And an FRP strength diagnostic main body 20 including an ultrasonic flaw detector 30 that inspects the thickness and erosion depth of the FRP thick portion 70. The ultrasonic array sensor 11 and the FRP intensity diagnostic main body 20 are connected by a cable 12. The ultrasonic array sensor 11 is composed of a plurality of transducers (elements). The FRP intensity diagnosis main body 20 includes an ultrasonic flaw detector 30, a sound thickness and deteriorated portion calculator 40, an evaluation storage unit 50, a deterioration evaluation unit 60, and a display unit 80.

  The ultrasonic flaw detector 30 is a device that transmits and receives ultrasonic waves, and includes a transmission circuit 31, a reception circuit 32, an A / D conversion circuit 33, and a delay circuit 34. The transmission circuit 31 transmits an input signal to the ultrasonic array sensor 11. The receiving circuit 32 receives an output signal from the ultrasonic array sensor 11. The A / D conversion circuit 33 converts an ultrasonic output signal from an analog signal to a digital signal. The delay circuit 34 controls the transmission time of the ultrasonic signal from the transducers constituting the ultrasonic array sensor 11. Specifically, the delay circuit 34 controls the timing (delay time) for applying a voltage to the transducers (elements) constituting the ultrasonic array sensor 11.

Based on the delay time output to the delay circuit 34 and the reception information from the reception circuit 32 via the A / D conversion circuit 33, the sound wall thickness / deterioration part calculation unit 40 determines whether there is a deterioration part in the inspection target. If there is no deteriorated part, an evaluation to that effect is made. If there is a deteriorated part, the sound layer 74 on the outer peripheral surface 72 side of the thick part 70 to be inspected, Recognizing the deteriorated layer 76 on the peripheral surface 73 side, the thickness and the healthy area ratio of the deteriorated layer are calculated. As a method for the sound thickness and deteriorated portion calculation unit 40 to recognize the sound layer 74 and the deteriorated layer 76, a known method can be used. For example, based on an image obtained by the apparatus described in Non-Patent Document 2. May be a method of recognizing.
A method for calculating the healthy area ratio of the deteriorated layer is calculated from the degree of defects in the lattice image of the image obtained by the ultrasonic flaw detector 30.

  The evaluation storage unit 50 is a storage device that stores an evaluation rank for the deterioration state of the thick portion 70 as shown in Table 1. The evaluation rank is a relationship of mechanical strength obtained by an FRP bending test with respect to a deteriorated state obtained in advance through experiments or the like.

  The deterioration evaluation unit 60 performs an evaluation rank based on the healthy area ratio and the degree of defects in the lattice image. Specifically, the deterioration evaluating unit 60 calculates the healthy area ratio based on the thickness of the healthy layer 74 and the thickness of the deteriorated layer 76 calculated by the healthy wall thickness and the deteriorated portion calculating unit 40. In addition, the deterioration evaluation unit 60 calculates the degree of defects in the lattice image indicating the state of the cross section of the measurement target acquired based on the output signal of the ultrasonic wave. Then, the degradation evaluation unit 60 selects the evaluation rank of the corresponding item among the items of the healthy area rate and the image state stored in the evaluation storage unit 50 for the calculated healthy area rate and the lattice image defect. To do.

  The display unit 80 displays the evaluation rank selected by the deterioration evaluation unit 60 and the evaluation that the inspection target evaluated by the sound thickness and deterioration portion calculation unit 40 has no deterioration portion. The display unit 80 also displays an image showing the thick portion 70 to be inspected, the sound layer 74 on the outer peripheral surface 72 side, and the deteriorated layer 76 on the inner peripheral surface 73 side.

  The ultrasonic array sensor 11 has a plurality of transducers (elements) and a contact surface that is in sliding contact with the outer peripheral surface 72 of the thick portion 70 that is a site to be inspected. In the phased array method, when an electric signal is sent to each transducer, the transmission time of the applied voltage is controlled by the delay circuit 34, and the superposition position of the phase of the ultrasonic wave generated from each transducer is controlled, thereby transmitting the transmission angle. Sector scanning is performed. Here, the control of the ultrasonic beam form is performed by setting a delay time. In general, since the inspection target part is made of a single material, the ultrasonic propagation time between the beam focusing point and each transducer is calculated as (linear geometric path) / (material sound velocity) and propagates to each transducer. The time difference can be used to determine the delay time of the array sensor. In addition, by using the delay time at this time and synthesizing the received wave, the inspection result can be displayed two-dimensionally.

  With reference to FIG. 2, the FRP intensity diagnostic method using the FRP intensity diagnostic apparatus 10 will be described. The FRP intensity diagnosis method is divided into intensity diagnosis preparation for recording the correlation between the healthy area ratio necessary for diagnosis and the bending test intensity, and intensity diagnosis for actually performing diagnosis.

(Preparation for strength diagnosis)
By the experiment or the like, the healthy wall thickness and deteriorated portion calculation unit 40 calculates the correlation between the healthy area ratio and the bending test strength necessary for the diagnosis in advance, and the evaluation storage unit 50 records the calculated correlation.
First, the healthy thickness portion 70 to be inspected is measured by the ultrasonic array sensor 11, and the healthy thickness and deteriorated portion calculation unit 40 obtains a cross-sectional image to be displayed on the display unit 80. And based on the healthy area rate calculation program and cross-sectional image which the healthy thickness and degradation part calculation part 40 has memorize | stored, the healthy area rate of the healthy measuring object is calculated. On the other hand, the bending strength of the thick portion 70 to be inspected, obtained by a separate experiment, is input to the healthy thickness and deteriorated portion calculation unit 40.
Similarly, the healthy wall thickness and deteriorated portion calculation unit 40 measures the wall thickness portion 70 for each inspection object deteriorated to a predetermined degree, and obtains a sound area ratio and bending strength.
Then, the healthy wall thickness and deteriorated portion calculation unit 40 calculates the correlation between the healthy area ratio and the bending strength by a known method (for example, calculates the function of the approximate line by the least square method). The evaluation storage unit 50 stores the correlation between the calculated healthy area ratio and the bending strength.

(Strength diagnosis)
First, the ultrasonic array sensor 11 is brought into contact with the outer peripheral surface 72 of the thick portion 70 of the FRP to be inspected, and flaw detection is performed by the phased array method (step ST01).

Next, the healthy wall thickness and deteriorated portion calculation unit 40 determines whether or not there is a lattice image defect due to the deterioration of the FRP that is the measurement target (step ST03).
When the sound thickness and deteriorated portion calculation unit 40 determines that the image to be measured is free of defects, it is evaluated as an evaluation rank I that is sound and no problem (step ST05), and the wall thickness of the sound layer 74 Measure.
The display unit 80 displays the measurement result of the measured thickness of the sound layer 74 (step ST07), and the sound wall thickness and deteriorated portion calculation unit 40 determines that the image to be measured is free from defects. The evaluation rank I to be displayed is displayed.

When the healthy thickness and deteriorated portion calculation unit 40 determines that there is a defect in the lattice image due to the deterioration of the FRP that is the measurement target, the deterioration evaluation unit 60 evaluates the defect in the lattice image based on the evaluation rank ( Step ST09). Specifically, the degradation evaluation unit 60 refers to the evaluation rank table shown in Table 1 and performs an evaluation rank based on the healthy area rate and the degree of defects in the lattice image.
Further, the deterioration evaluation unit 60 calculates the value of the bending strength with respect to the healthy area rate based on the healthy area rate and the correlation between the healthy area rate and the bending strength stored in the evaluation storage unit 50, The bending strength of the thick portion 70 to be inspected is evaluated. And the deterioration evaluation part 60 implements comprehensive evaluation of a test object comprehensively based on the thickness of the healthy layer 74, and the bending strength calculated | required from the healthy area rate.

  The display unit 80 displays the measurement result of the measured thickness of the sound layer 74 and also displays the evaluation rank selected by the deterioration evaluation unit 60 and the overall evaluation.

  Thus, since the FRP intensity diagnostic apparatus 10 displays the degree of deterioration of the thick portion 70 of the FRP by the evaluation rank, the FRP intensity can be objectively diagnosed.

DESCRIPTION OF SYMBOLS 10 FRP intensity diagnostic apparatus 11 Ultrasonic array sensor 12 Cable 20 FRP intensity diagnostic main body 30 Ultrasonic flaw detection part 31 Transmission circuit 32 Reception circuit 33 Conversion circuit 34 Delay circuit 40 Sound thickness and degradation part calculation part 50 Evaluation memory | storage part 60 Degradation evaluation Part 70 thick part 72 outer peripheral surface 73 inner peripheral surface 74 sound layer 76 deteriorated layer 80 display unit

Claims (5)

An FRP strength diagnostic device for diagnosing the strength of the thick part of FRP,
An ultrasonic array sensor for transmitting and receiving ultrasonic waves to a thick part to be inspected;
An ultrasonic flaw detector for transmitting and receiving ultrasonic waves by a phased array method to the ultrasonic array sensor;
A sound thickness and deteriorated portion calculation unit for calculating a sound thickness and a sound area ratio and an erosion depth of the thick part of the FRP based on information of reception of ultrasonic waves obtained by the ultrasonic flaw detection unit;
An evaluation storage unit that stores an evaluation rank of deterioration of FRP associated with an erosion depth and a healthy area ratio of the thick part of the FRP;
Deterioration evaluation for performing an evaluation ranking of the erosion of the thick part to be inspected based on the healthy thickness and erosion depth, the healthy area ratio, and the evaluation storage unit obtained by the healthy wall thickness and deteriorated part calculation unit And
An FRP intensity diagnostic apparatus comprising: a display unit that displays a result of evaluation by the deterioration evaluation unit. The deterioration evaluation unit further determines whether or not there is a lack of a thick part to be inspected in a lattice image obtained based on information on reception of ultrasonic waves obtained by the ultrasonic flaw detection unit,
The FRP intensity diagnosis apparatus according to claim 1, wherein when it is determined that there is a lack, an evaluation ranking of erosion of the thick portion to be inspected is performed.   The FRP intensity diagnosis apparatus according to claim 1, wherein the display unit further displays, as an image, information on reception of ultrasonic waves obtained by the ultrasonic flaw detection unit.   The FRP intensity diagnosis apparatus according to any one of claims 1 to 3, wherein the evaluation storage unit stores in advance an evaluation calculated from a relationship between a deteriorated FRP state and the bending strength of the deteriorated FRP.   The FRP intensity diagnostic method using the FRP intensity diagnostic apparatus in any one of Claim 1 to 4.

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