JPH10281961A - Nondestructive testing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To nondestructively detect the deforming and breaking behavior within a material at real time in a material test by composing AE(acoustic emission) measurement with ultrasonic flaw detection. SOLUTION: In a nondestructive evaluation testing device, an ultrasonic flaw detecting device 2 is arranged near a horizontal material testing machine 1, and an AE sensor 3 is mounted on a test piece S within a water tank 12. The test piece S is held by the holding part 11a of a loading mechanism part 11 and the holding part 13a of a load detecting part 13. The motor 11b of the loading mechanism part 11 is driven to load the test piece S. The AE data is recorded by the AE sensor 3, and the loading is stopped. An ultrasonic prove 24 is scanned by an X-axial arm 21, a Y-axial arm 22 and a Z-axial arm 23 to perform the flaw detection of the test piece S by the ultrasonic flaw detecting device 2, and the data of ultrasonic flaw detection is recorded. The recording of the AE data and the recording of ultrasonic flaw detection are repeated by the control of a personal computer, and the measurement result is image- displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-destructive method for detecting the deformation and destruction behavior of various materials by performing AE measurement under load and ultrasonic flaw detection of the materials in order to perform non-destructive evaluation of various materials. Related to the test method.

[0002]

2. Description of the Related Art In the destruction of a material, microscopic cracks occur due to local stress concentration on cracks or impurities contained in the material, and microscopic cracks occur → union of microscopic cracks → progress of macroscopic cracks → In many cases, the process is called final destruction. Therefore, in addition to the occurrence of micro-cracks, it is important to know the process by which micro-cracks coalesce three-dimensionally in the development and quality assurance of high-strength and high-toughness materials.

[0003] Conventionally, various material testing methods have been used for evaluating materials, and one of them is a tensile test. From the tensile test, it is possible to know the relationship between the strain and the stress of the material, but it is not possible to directly observe the change progressing inside the material as described above.

[0004] As a method of measuring a crack generated inside a material under a load, there are an AE measurement method and an ultrasonic flaw detection method. The AE measurement method is a method of detecting an AE (acoustic emission) wave accompanying a microscopic crack generated in a material under a load, and can measure a frequency and a position of occurrence of a microscopic crack with respect to a tensile load. Ultrasonic flaw detection is a method of irradiating a material with ultrasonic waves to detect a reflected wave from the inside thereof, and it is possible to observe the distribution and deformation range of cracks in the material. Thus, the AE measurement method is suitable for observing the dynamic and microscopic behavior of a material under a load, whereas the ultrasonic flaw detection method is a static and macroscopic method of cracking. Suitable for observing the structure.

[0005]

As a problem of the above-mentioned AE measurement method, it is not possible to directly capture a process in which individual micro-cracks grow and coalesce to form macro-cracks by AE measurement alone. Later, it was necessary to estimate when, where and how the cracks progressed from the relationship between the microscopic structure of the material and the microscopic observation of the fracture surface or the side surface of the specimen.

On the other hand, in the ultrasonic flaw detection method, it is difficult to judge when and where a waveform occurs in a material from a stress-strain curve of a tensile test. Ultrasonic testing had to be performed over the entire length of the piece. Furthermore, when the ultrasonic beam is focused to improve the crack detection capability, it is necessary to conduct the flaw detection by adjusting the focal point of the beam to the depth where the internal crack exists. Since the position of the crack initiation cannot be specified by itself, it was necessary to perform ultrasonic testing over the entire depth direction while changing the focal position at a constant width in the depth direction of the test piece. Therefore, it takes a great deal of time to observe the fracture process from the generation of microscopic cracks to the final fracture, and the behavior of the fracture that progresses from the generation of microscopic cracks to the final fracture gradually increases. There was a risk of overlooking it.

[0007]

According to a first aspect of the present invention, there is provided a non-destructive test method comprising: a material testing machine for applying a load to a test piece; and an AE measurement of the test piece. A non-destructive test method for detecting the destructive behavior of the test piece by using an AE measuring instrument for performing the test and an ultrasonic flaw detector that scans the surface of the test piece and performs ultrasonic flaw detection. A first step of performing AE measurement with the AE measuring instrument by applying a load to a specimen and a second step of performing ultrasonic inspection of the test specimen with the ultrasonic inspection apparatus are alternately repeated. I do.

According to the non-destructive testing method of the present invention, the change in the test piece is monitored by the AE measurement performed in the first step, and the ultrasonic flaw detection is performed in the second step. You can observe the state of destruction in the test piece with
This makes it possible to detect a fracture process that progresses stepwise in a test piece without missing it.

According to a second aspect of the present invention, in the first step of the first aspect, a load is applied to the test piece, the load is immediately removed, and the ultrasonic inspection is performed. Thus, it is possible to detect a destruction process in a material test in which the application of the load and the unloading of the load are repeated a predetermined number of times.

According to a third aspect of the present invention, there is provided a non-destructive test method, wherein a load is applied to the test piece in the first step of the first step to maintain the applied load. The method is characterized in that the load is unloaded after flaw detection, and a destruction process in a fatigue test in which a load is applied, a load is held, and the load is unloaded can be detected in each cycle.

According to a fourth aspect of the present invention, there is provided a non-destructive test method, wherein a material testing machine for applying a load to a test piece, an AE measuring instrument for performing AE measurement of the test piece, and ultrasonic flaw detection by scanning the surface of the test piece. A nondestructive test method for detecting the destructive behavior of the test piece using an ultrasonic flaw detector, wherein a load is applied to the test piece by the material testing machine, and AE measurement is performed by the AE measuring instrument.
The generation position is located, and ultrasonic testing of the test piece is performed by the ultrasonic testing apparatus at the location.

According to the non-destructive testing method of the fourth aspect configured as described above, the ultrasonic flaw detection can be performed with the scanning range limited to the vicinity of the position where the AE detected by the AE measuring device is generated. Can perform ultrasonic testing.

According to a fifth aspect of the present invention, there is provided a non-destructive testing method, comprising: a material testing machine for applying a load to a test piece; an AE measuring device for performing AE measurement of the test piece; A nondestructive test method for detecting the destructive behavior of the test piece using an ultrasonic flaw detector for flaw detection, wherein a load is applied to the test piece with the material testing machine, and AE measurement is performed with the AE measuring device. A change in the AE generation characteristic is monitored, and when the change in the AE generation characteristic is detected, the test piece is subjected to ultrasonic flaw detection by the ultrasonic flaw detector.

According to the non-destructive testing method of the fifth aspect constructed as described above, ultrasonic inspection is performed when the AE generation characteristics change, so that ultrasonic inspection is performed only when necessary. The test can be performed in a short time without missing each stage of the breaking process in the piece.

According to a seventh aspect of the present invention, there is provided a non-destructive testing method, comprising: a material testing machine for applying a load to a test piece; an AE measuring instrument for performing AE measurement of the test piece; A non-destructive testing method for detecting the destructive behavior of the test piece using an ultrasonic flaw detector for flaw detection, wherein a load is applied to the test piece with the material testing machine, and AE measurement is performed with the AE measuring device. An AE occurrence position is located, and at this location, the test piece is subjected to ultrasonic flaw detection by the ultrasonic flaw detector, time-series ultrasonic waveform data is collected, and the difference between the ultrasonic waveform data at any two times is determined. Thus, the change of the test piece between the two times is extracted.

According to the nondestructive testing method of the present invention, the ultrasonic inspection is performed with the scanning range limited to the vicinity of the position where the AE detected by the AE measuring device is generated. In addition to the above, the ultrasonic flaw detection can be executed, and a change occurring between any two times can be detected without being affected by data before the two times.

[0017]

Embodiments of the present invention will be described below. FIG. 1 is a schematic view of a main part of a mechanical part of a nondestructive evaluation test apparatus to which the present invention is applied, and FIG. 2 is a block diagram of a main part showing a control system thereof. As shown in FIG. A test machine 1 and an ultrasonic flaw detector 2 are provided. The horizontal material testing machine 1 includes a load mechanism 11, a water tank 12, and a load detector 13. The grip 11a of the load mechanism 11 and the grip 13a of the load detector 13 are inserted into the water tank 12. The test piece S is held by the grippers 11a and 13a.
Is held in the water tank 12. Then, a load (for example, tension) is applied to the test piece S by driving the motor 11b of the load mechanism unit 11, and the load is detected by a load cell or the like of the load detection unit 13.

The ultrasonic flaw detector 2 comprises an X-axis arm 21 and a Y-axis
An ultrasonic probe 24 held by a shaft arm 22 and a Z-axis arm 23 is provided. The ultrasonic probe 24 is connected to a controller (not shown), generates an ultrasonic wave with a pulse signal from the pulsar / receiver 10 in the controller, and reflects the ultrasonic wave reflected by the test piece S (and the inside thereof). And outputs an echo signal to the pulser / receiver 10 (FIG. 2). Thereby, the pulsar / receiver 10 outputs an ultrasonic waveform signal to the ultrasonic waveform recording unit 20 in the controller. The X-axis arm 21, the Y-axis arm 22, and the Z-axis arm 23 are each driven by a three-axis table controller 30, and the ultrasonic probe 24 moves the X-axis within a plane at a predetermined height in the Z direction in the water tank 12. Scanning is performed in the -Y direction. The ultrasonic flaw detection by the ultrasonic probe 24 is performed in a liquid (for example, water) in the water tank 12.

As a result, the test piece S is
Is scanned to record ultrasonic waveform data at each scanning point on the XY plane, and an ultrasonic image inside the test piece S is obtained based on this data. As this ultrasonic image, the test piece S
Image showing the peak intensity of the ultrasonic wave at each position of the depth in the Z direction (this is referred to as “B scope”).
Called. ), An image of the inside of the test piece S viewed from the front of the XY plane in the Z direction (this is referred to as a “C scope”),
Alternatively, it is obtained as a 3D image image.

The horizontal tensile tester can apply loads in various directions and in various methods. In the following description, a case where loads are applied in the horizontal direction will be described.

At least one AE sensor 3 is attached to the test piece S, and the AE sensor 3
An AE signal is generated by detecting an internally generated AE wave.
The AE signal is amplified by an amplifier (not shown) and output to an AE measuring device 40 (FIG. 2).
The data is stored.

The personal computer 4 has a CPU 4
1, a ROM 42, a RAM 43, an input device 44 such as a keyboard and a mouse, a CRT 45, a storage device 46 such as a floppy disk drive or a hard disk device, and a control program supplied from the floppy disk is installed on the hard disk. Based on this control program, the CPU 41 performs control using a working area such as the RAM 43.

The ultrasonic waveform recording section 20 amplifies the ultrasonic waveform signal from the pulser / receiver 10 with an amplifier 20a, and
The data is converted into digital data (waveform sampling data) by the / D conversion circuit 20b and stored in the RAM 20c as ultrasonic waveform data. The CPU 41 uses the RAM 20c
The data of ultrasonic flaw detection is recorded by reading the data of. Further, the CPU 41 records the AE data by reading the AE data of the AE measuring device 40.

The control program executed by the CPU 41 is as follows:
As shown in FIG. 3, an AE measuring device control program for controlling the AE measuring device 40, an ultrasonic flaw detection device control program for controlling the ultrasonic flaw detection device 2, a testing machine control program for controlling the horizontal material testing machine 1, and Each of the control programs is started based on a multitasking function of a system program preinstalled on the hard disk of the storage device 46.

At the time of starting each control program,
Through the menu display on the CRT 45 and the operation of the mouse and the keyboard, setting of various test conditions and setting instructions for data recording, data reproduction, data analysis, image display, and the like can be input. The AE measuring instrument control program, the ultrasonic flaw detector control program, and the testing machine control program can be started independently, but they exchange necessary data between the programs, and mutually prioritize control. The right income has been destroyed.

Further, the recording of AE data (AE recording) is started and stopped by the AE measuring instrument control program, the recording of ultrasonic waveform data (UT recording) is started by the ultrasonic flaw detector control program, and the recording of UT is started. Various functions in each program, such as the end, the start of load application in the horizontal tester 1 by the tester control program, the maintenance of the load application, and the unloading, can be executed under the control of the automatic test program.

FIG. 4 is a flowchart showing an outline of the automatic test program. When a test is started by this automatic test program, first, a load pattern setting process is performed in step S1. That is, a first load pattern in which “load-hold” is repeated as a cycle, “load-unload”
The tester sets and inputs a load pattern according to the test conditions from a second load pattern that repeats the above as a cycle, a third load pattern that repeats “load-hold-unload” as a cycle, and the like.

When a load pattern is set and input, processing according to the load pattern is performed. FIG. 4 shows the flow when the first load pattern is selected in detail. That is, when the first pattern is selected and input, the load control in the horizontal test machine 1 is started according to the load pattern by the test machine control program in step S2, and A is controlled by the AE measuring instrument control program in step S3.
Start E recording. Next, for example, when a predetermined load value is reached, a UT recording start command is issued to the ultrasonic flaw detector control program in step S4, the load applied to the horizontal testing machine 1 is held in step S5, and the AE is stored in step S6. The recording is temporarily suspended, and the AE at the time of
Data such as an AE occurrence position, an AE occurrence frequency, an AE occurrence rate, an AE amplitude, an AE occurrence time, and a load are stored as measurement data.

Next, the ultrasonic flaw detection apparatus control program is started in step S8, the AE generation position data is written in a file for the ultrasonic flaw detection apparatus control program in step S9, and the ultrasonic flaw detection apparatus control program is used in step S10. The ultrasonic probe is focused on the AE occurrence position based on the AE occurrence position data in the file. Further, the UT recording is started by scanning a predetermined range around the AE generation position with the ultrasonic probe 24. Limiting the operation range of the ultrasonic probe significantly reduces the amount of recorded data, making it possible to perform ultrasonic inspection in a short time. Conversely, increasing the number of repetitions of ultrasonic inspection The destruction process can be captured as a more detailed change with time.

When the recording of the ultrasonic waveform data according to the measurement conditions is completed, the UT recording is terminated in step S11, the AE recording is restarted by the AE measuring instrument control program in step S12, and the horizontal test machine 1 Resume loading. Then, the process returns to step S4 according to the measurement conditions, and repeats steps S4 to S13 to alternately perform the AE measurement and the ultrasonic flaw detection.
Then, the AE recording ends, and data processing is performed in step S20.

When the second load pattern is set and inputted, the AE measurement is performed by repeating the "load-unload" cycle operation in step S15, and the ultrasonic flaw detection is performed in step S16. Then, steps S15 and S16 are repeated, and data processing is performed in step S20.

If the third load pattern has been set and input, A is set in step S17 under the condition of "load-hold".
E measurement is performed, ultrasonic testing is performed in step 18, and then the load is unloaded in step 19.
Steps S7 to S19 are repeated, and data processing is performed in step S20.

In the above example, the UT recording start command is issued based on the load value in step S3. However, the timing of this start command can be set according to test conditions and test contents. For example, a command may be issued based on the number of times of occurrence of the AE event, the time, and the like.

When the number of AEs or the AE energy increases rapidly when the internal cracks increase, the number of AE events or the AE energy value itself, or A
A UT recording start command may be issued based on the rate of increase in the number of occurrences of E or the rate of increase in AE energy. Further, in another example, a UT recording start command may be issued based on the AE amplitude and the rising direction (phase) of the AE waveform. In other words, the fracture process of fiber-reinforced composite materials consists of separation of the fiber-matrix interface, fiber cracks, matrix cracks, etc.It is important to know when and how these fractures occur when developing high-strength materials. Will be important above. Further, the AE generated in response to the fiber crack has a small amplitude and the rising direction of the AE waveform is the same (in-phase).
The AE generated in response to the matrix crack has a large amplitude and the rising edge of the AE waveform is in the opposite direction (reverse phase), and the AE generated in response to the separation between the fiber and the matrix interface has a large amplitude. I know that

Therefore, in the present invention, the amplitude of the AE detected by the AE measuring device and the phase of the AE waveform are monitored, and the occurrence of the small-amplitude in-phase AE or the initiation of the large-amplitude in-phase AE is started. By performing the ultrasonic inspection at the time when the AE with a large amplitude and the opposite phase AE starts to be generated, it is possible to efficiently measure which stress causes which fracture to occur.

Further, in the above example, the load is held during the UT recording. However, when the load application speed is low, the UT can be continuously recorded without holding the load.

Next, the measurement results obtained by the data processing are as follows:
By displaying the screen of the CRT 45 and operating the mouse or the keyboard, the CR (CR) according to the input instruction of the operator (measurement person)
Display at T45. First, the total time when a load is applied as shown in FIG. 5 (A) (time other than UT recording (time))
For example, a trend graph (load curve monitor graph) of the number of AE events (EVENT) and load (load) is displayed on the CRT 45 as a basic screen as an AE generation characteristic with respect to the AE event, and at the same time, as shown in FIG. Display a menu. In this state, if "cooperation of ultrasonic C scope" in the menu is clicked with a mouse, an image selection dialog box of the ultrasonic C scope as shown in FIG. 5C is displayed. In this image selection dialog box, data obtained by one UT recording is used as one file.
Displays a list of T files.

In this state, when an arbitrary point on the monitor graph is pointed (double-clicked) with a cursor (cross-shaped line) for moving with a mouse, the UT file displayed in the image selection dialog box is displayed. The name of the UT file at the measurement time closest to the time of the designated point is highlighted. Then press Enter on the keyboard
When the key is pressed or the inverted display section is double-clicked with the mouse, for example, as shown in FIG. 5D, the ultrasonic C scope image of the selected UT file is displayed on the CRT4.
4 is displayed. The C scope screen is a screen in which the ultrasonic reflection echo intensity or the propagation time at each measurement position (position on the XY plane) by the ultrasonic probe is displayed in gradation.

In the above example, when an arbitrary point on the monitor graph is designated, the file name of the UT file is displayed once in the image selection dialog box. When an arbitrary point is designated, the ultrasonic C-scope image corresponding to the point may be displayed immediately.

Also, a list of UT files is displayed together with the monitor graph, and when a file name is designated from the list of UT files, the designated UT file on the curve of the AE generation characteristic of the monitor graph is displayed. The point corresponding to the time is switched to a display as indicated by a cross cursor. This makes it easier to grasp the relationship between the time of the desired UT file and the AE generation characteristics.

Next, as shown in FIG. 6A, the display of the ultrasonic C scope image (C scope screen) is used as a basic screen.
At the same time, a menu as shown in FIG. 6B is displayed.
In this state, if “AE location link” in the menu is clicked with the mouse or an arbitrary point on the C scope screen is designated (double-clicked) with the mouse, the AE is displayed as shown in FIG. A marker (circular display) indicating the event search range and an AE location information dialog box as shown in FIG. 6D are displayed. This A
In the E location information dialog box, the time (time), load (load), and position (location) of the AE events generated within the range specified by the marker are respectively displayed.
Is displayed. The marker can be moved and its size can be changed by a keyboard operation or a mouse operation, and the result (specified range of the marker) is reflected in the AE location information dialog box.

When the AE location information in the AE location information dialog box is double-clicked with a mouse, the occurrence position of the designated AE event is displayed on the C scope screen as shown in FIG. Displayed with a cursor (cross line) at the top.

Next, in order to see the change between two arbitrary times, the following processing is performed by screen display and input designation.
First, a monitor graph shown in FIG. 5A is displayed in a mode for performing such processing. Any 2 on this monitor graph
When a point is designated by a cursor (cross-shaped line), the U of the two measurement times closest to the time of the designated two points is determined.
The T files are respectively searched, and the data of the two UT files are subjected to the following processing.

First, as shown in FIG.
An ultrasonic C scope image (an image of screen 1 at time t and an image of screen 2 at time t + Δt) for the T file is displayed on CRT 44. This ultrasonic C scope image is shown in FIG.
As in (D), the intensity or propagation time of the ultrasonic reflected echo is displayed in gradation for each measurement point (XY coordinate point). Next, when the difference between the images is designated from the menu display or the like, the difference between the peak intensities of the ultrasonic echo intensity or the difference in the peak intensity of the propagation time of the two UT files is obtained, and the difference is displayed in gradation. . As a result, FIG.
As shown in (B), the change generated between time t and time t + Δt is extracted, and an image corresponding to the change is displayed.

As described above, since the AE measurement and the ultrasonic flaw detection are performed alternately in combination, the respective measurement results can be displayed in association with each other, and the deformation / destruction behavior of the test piece during the test can be determined. It can be detected and evaluated in real time by destruction.

In addition, ultrasonic testing can be performed while a load is applied without removing the test piece from the tester. Further, micro cracks generated in the material under load can be reduced.
The data can be recorded in real time by the AE measuring device and the ultrasonic flaw detection data can be recorded at an arbitrary time.

In the above embodiment, the AE measurement by the AE measuring device control program and the ultrasonic inspection by the ultrasonic inspection device control program are automatically performed based on the automatic test program. It may be performed alternately one by one based on the instruction.

The present invention also relates to strains (loads) used in tensile tests, compression tests, bending tests, fracture toughness tests, etc.
The present invention is also applicable to a load pattern of constant speed control.

Further, in the above embodiment, for example, the number of AE events (EVENT) is displayed on the screen as the AE generation characteristic, but the AE energy and the AE event occurrence rate are measured by a general AE measuring instrument. The displayed AE data may be displayed.

[0050]

As described above, according to the nondestructive test method of the present invention, a material testing machine for applying a load to a test piece, an AE measuring device for performing AE measurement on the test piece, and scanning of the test piece Using an ultrasonic flaw detector to perform ultrasonic flaw detection, and when detecting the fracture behavior of the test piece, applying a load to the test piece with the material tester, and performing AE measurement with the AE measuring device. Performing ultrasonic testing of the test piece with the ultrasonic testing apparatus according to the purpose of measurement, and detecting a dynamic change in the test piece during material testing by AE measurement,
By executing ultrasonic flaw detection when a change in the AE generation characteristic is detected, it is possible to detect a destructive process that progresses stepwise in the test piece without missing. Further, by locating the position where the AE detected by the AE measuring device is generated and focusing the ultrasonic probe on the locating position, high-resolution crack measurement can be performed. Further, by performing the ultrasonic flaw detection with the scanning range limited to the vicinity of the orientation position, the ultrasonic flaw detection can be performed in a short time, and conversely, the number of repetitions of the ultrasonic flaw detection can be increased, so that the test can be performed. It is possible to capture the fracture behavior that evolves stepwise within the piece in detail and efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic view of a main part of a mechanism of a nondestructive evaluation test apparatus to which the present invention is applied.

FIG. 2 is a main block diagram showing a control system of the nondestructive evaluation test apparatus.

FIG. 3 is a diagram showing a concept of a control program in the embodiment.

FIG. 4 is a flowchart showing an outline of an automatic test program in the embodiment.

FIG. 5 is a diagram for explaining display switching to a C scope screen in the embodiment.

FIG. 6 is a diagram illustrating an example of position display of AE location information in the embodiment.

FIG. 7 is a diagram showing a screen of a process of extracting a change in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Horizontal material testing machine, 2 ... Ultrasonic flaw detector, 3 ... AE sensor, 4 ... Personal computer, 24 ... Probe, 1
0: pulser / receiver, 20: ultrasonic waveform recording unit, 40
... AE measuring instrument.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yusuke Mashimo 1-31 Kurobeoka, Hiratsuka-shi, Kanagawa Japan Tobacco Inc. Production Technology Development Center (72) Inventor Shigemi Masuno 1 Kurobeoka, Hiratsuka-shi, Kanagawa No. 31 Inside Japan Tobacco Inc. Production Technology Development Center

Claims (7)

[Claims] 1. A material testing machine for applying a load to a test piece,
A non-destructive test method for detecting the destructive behavior of the test piece using an AE measuring instrument for performing AE measurement of the test piece, and an ultrasonic flaw detector that scans the test piece surface and performs ultrasonic flaw detection, A first step of performing AE measurement with the AE measuring instrument by applying a load to the test piece with the material testing machine, and a second step of performing ultrasonic testing of the test piece with the ultrasonic testing apparatus,
A non-destructive test method characterized by being repeated alternately. 2. The non-destructive testing method according to claim 1, wherein in the first step, a load is applied to the test piece, the load is immediately removed, and the ultrasonic flaw detection is performed. 3. The method according to claim 1, wherein a load is applied to the test piece in the first step to hold the applied load, and the load is removed after performing the ultrasonic flaw detection in the second step. Item 1. Non-destructive test method according to Item 1. 4. A material testing machine for applying a load to a test piece,
A non-destructive test method for detecting the destructive behavior of the test piece using an AE measuring instrument for performing AE measurement of the test piece, and an ultrasonic flaw detector that scans the test piece surface and performs ultrasonic flaw detection, A load is applied to a test piece by the material testing machine, AE measurement is performed by the AE measuring device, an AE occurrence position is located, and ultrasonic testing of the test piece is performed by the ultrasonic testing device at the located position. Non-destructive testing method characterized by the following. 5. A material testing machine for applying a load to a test piece,
A non-destructive test method for detecting the destructive behavior of the test piece using an AE measuring instrument for performing AE measurement of the test piece, and an ultrasonic flaw detector that scans the test piece surface and performs ultrasonic flaw detection, A load is applied to a test piece by the material testing machine, AE measurement is performed by the AE measuring device, and a change in AE generation characteristics is monitored.
A non-destructive testing method, wherein when the change in the E generation characteristic is detected, the test piece is subjected to ultrasonic testing using the ultrasonic testing apparatus. 6. The nondestructive test method according to claim 5, wherein the AE generation characteristic is an AE generation position, AE energy, AE amplitude, or AE waveform phase. 7. A material testing machine for applying a load to a test piece,
A non-destructive test method for detecting the destructive behavior of the test piece using an AE measuring instrument for performing AE measurement of the test piece, and an ultrasonic flaw detector that scans the test piece surface and performs ultrasonic flaw detection, A load is applied to a test piece with the material testing machine, an AE measurement is performed with the AE measuring device, an AE occurrence position is located, and an ultrasonic flaw detection of the test piece is performed with the ultrasonic flaw detector at this located position, A non-destructive test, wherein time-series ultrasonic waveform data is collected and a difference between the ultrasonic waveform data at any two times is obtained to extract a change in the test piece between the two times. Method.