Fatigue test fixture and fatigue test system

Abstract

To provide a fatigue test jig and a fatigue test system that can conduct a more accurate fatigue test.SOLUTION: A fatigue test jig comprises: a jig body which supports an object to be inspected; a load imparting part which places a load; a moving mechanism which has a moving body moving relatively to the jib body in a reference direction along an inspection surface of the object to be inspected; an ultrasonic probe which is provided to the moving body; an energizing member which applies the ultrasonic probe with energizing force toward the inspection surface; and a guide mechanism which makes the ultrasonic probe abut on the inspection surface with the energizing force when the moving body is at a first position in the reference direction and separates the ultrasonic probe against the energizing force when the moving body is at a second position in the reference direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a fatigue test fixture and a fatigue test system. [Background technology]

[0002] Tests in which a tensile load or a compressive load is applied to an object to be inspected are widely carried out to measure the fatigue strength of metallic materials and composite materials. A specific example of an apparatus used for this type of test is described in Patent Document 1 below. This apparatus is provided with a probe that can move along the side of the object to be inspected. After applying a load to the object to be inspected, the probe is moved to the inspection position and an ultrasonic flaw detection test is performed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 4-43262 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the device described in Patent Document 1, the probe and the test object are in constant contact with each other. For this reason, the inspection device cannot be installed in a strength testing machine while it is still attached. In other words, for example, when repeatedly applying loads, the inspection device must be removed from the strength testing machine each time. As a result, the contact position of the probe may shift slightly each time a test is performed, which may result in inaccurate inspection and testing.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a fatigue test jig and a fatigue test system that are capable of performing more accurate fatigue tests. [Means for solving the problem]

[0006] In order to solve the above problems, the fatigue testing jig according to the present disclosure comprises a jig main body that supports an object to be inspected, a load applying section that applies a load to the object to be inspected, a moving mechanism that is integrally formed with the jig main body and has a moving body that moves relative to the jig main body in a reference direction along the inspection surface of the object to be inspected, an ultrasonic probe that is provided on the moving body, a biasing member that applies a biasing force to the ultrasonic probe toward the inspection surface, and a guide mechanism that abuts the ultrasonic probe against the inspection surface in accordance with the biasing force when the moving body is at a first position in the reference direction, and moves the ultrasonic probe away from the inspection surface against the biasing force when the moving body is at a second position in the reference direction. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a fatigue test jig and a fatigue test system that are capable of performing a more accurate fatigue test. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing the configuration of a fatigue test fixture according to a first embodiment of the present disclosure, illustrating a state in which a moving body is in a first position. FIG. [Figure 2] FIG. 2 is a side view showing the configuration of the fatigue test fixture according to the first embodiment of the present disclosure, illustrating a state in which the moving body is in a second position. [Figure 3] FIG. 10 is a schematic diagram showing the configuration of a fatigue testing system according to a second embodiment of the present disclosure. [Figure 4] FIG. 1 is a cross-sectional view showing a first modified example of a fatigue test fixture common to each embodiment of the present disclosure. [Figure 5] FIG. 10 is a cross-sectional view showing a second modified example of a fatigue test fixture common to each embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] First Embodiment A fatigue test jig 1 according to a first embodiment of the present disclosure will be described below with reference to Figures 1 and 2. This fatigue test jig 1 is used to apply a load (tensile load, compressive load, or shear load) to an object 2 to be inspected, and to inspect the object 2 for flaws and cracks that occur before and after the load by ultrasonic flaw detection.

[0010] (Configuration of the object to be inspected) As shown in Fig. 1, the object to be inspected 2 has a plate-shaped main body 20 having an inspection surface 22, and an upright portion 21 extending perpendicularly from the center of the main body 20. In other words, the object to be inspected 2 has a T-shaped cross section. The surface of the main body 20 facing away from the upright portion 21 is the inspection surface 22. The longitudinal direction of the inspection surface 22 is set as the reference direction A. The upright portion 21 is provided in the center in the reference direction A.

[0011] (Configuration of fatigue test jig) The fatigue test jig 1 includes a jig body 3, a load applying section 4, a moving mechanism 5, an ultrasonic probe 6, a biasing member 7, a guide mechanism 8, and a spray device 9.

[0012] (Configuration of the jig body) The jig body 3 is a member for supporting the object to be inspected 2. The jig body 3 has a pair of gripping parts 30 that grip the main body part 20 of the object to be inspected 2 on both sides in the reference direction A, and a stage part 31 that connects the gripping parts 30 to each other in the reference direction A. The gripping parts 30 extend in a direction that intersects with the reference direction A. Preferably, the gripping parts 30 extend in a direction that is perpendicular to the reference direction A. In the following description, the direction that is perpendicular to the reference direction A (i.e., the direction in which the above-mentioned standing parts 21 extend) is referred to as the perpendicular direction B. The object to be inspected 2 is gripped at one end of the gripping parts 30 in the perpendicular direction B.

[0013] The stage part 31 connects one end of the pair of gripping parts 30 in the orthogonal direction B to each other in the reference direction A. Therefore, a space is formed between the pair of gripping parts 30 and the stage part 31. A screw hole 32 is formed in the center of the stage part 31 in the reference direction A. A fixing screw 33 fixed to the workbench is screwed into this screw hole 32. In other words, the jig body 3 is fixed so as not to move relative to the workbench.

[0014] (Configuration of load applying part) The load applying unit 4 has a chuck 40 that clamps the standing portion 21 of the object to be inspected 2, and a load generating unit (not shown) that generates a load in the orthogonal direction B on the chuck 40. With the standing portion 21 clamped by the chuck 40, the load generating unit can apply a compressive load or a tensile load in the orthogonal direction B to the standing portion 21 and the main body portion 20. In other words, the load applying unit 4 constitutes a load testing machine.

[0015] (Configuration of the moving mechanism) The movement mechanism 5 has a screw shaft 50, a moving body 51, and a drive device 52. The screw shaft 50 is rod-shaped and centered on a central axis X extending in a reference direction A. A male thread is formed on the outer circumferential surface of the screw shaft 50. The screw shaft 50 is preferably a trapezoidal screw. The screw shaft 50 extends between the pair of gripping parts 30 described above. One end of the screw shaft 50 penetrates the gripping parts 30 and extends to the outside of the gripping parts 30. A handle 53 serving as a drive device 52 for rotating the screw shaft 50 is attached to the one end. The other end of the screw shaft 50 is supported by the other gripping part 30 in a state where it can rotate around the central axis X.

[0016] The moving body 51 has a top 54 and a moving body main body 55. The top 54 has a female thread that screws onto the male thread of the screw shaft 50. In other words, when the screw shaft 50 is rotated, the top 54 can move along the screw shaft 50 in the reference direction A. The moving body main body 55 is provided integrally with this top 54. In other words, the moving body main body 55 can move together with the top 54 in the reference direction A. The moving body main body 55 is fixed to one side of the top 54 in the orthogonal direction B.

[0017] A biasing member 7 and the ultrasonic probe 6 are attached to the movable body main body 55. The biasing member 7 is, for example, a compression coil spring. One end of the biasing member 7 is fixed to the movable body main body 55, and the other end supports the ultrasonic probe 6. The biasing member 7 biases the ultrasonic probe 6 toward one side in the orthogonal direction B, that is, toward the inspection surface 22 of the object to be inspected 2. Note that, although the example in FIG. 1 shows an example in which a shoe 56 is interposed between the ultrasonic probe 6 and the inspection surface 22, the shoe 56 may be omitted.

[0018] (Ultrasonic probe configuration) Although not shown in detail, the ultrasonic probe 6 has an excitation coil and a detection coil. The excitation coil generates an eddy current near the inspection surface 22. If there is a defect such as a scratch or crack on the inspection surface 22, a disturbance occurs in the eddy current. The detection coil detects this disturbance in the eddy current and sends it as an electrical signal to an external measuring device, etc. This makes it possible to observe the properties of the scratch, crack, etc.

[0019] (Configuration of guide mechanism) The guide mechanism 8 is a mechanism for transitioning the ultrasonic probe 6 between a state in which the ultrasonic probe 6 is in contact with the inspection surface 22 (hereinafter, the position of the movable body 51 in this state will be referred to as the "first position P") and a state in which the ultrasonic probe 6 is separated from the inspection surface 22 (hereinafter, the position of the movable body 51 in this state will be referred to as the "second position Q") while the movable body 51 is moving in the reference direction A.

[0020] The guide mechanism 8 has a guide member 80 and a pin member 81. The guide member 80 extends in the reference direction A between the pair of gripping portions 30 of the jig body 3. The surface of the guide member 80 facing the stage portion 31 is a guide surface 82. The guide surface 82 has a first flat portion 83, a pair of inclined portions 84, and a pair of second flat portions 85.

[0021] Since the guide surface 82 is symmetrical with respect to the center of the reference direction A as the axis of symmetry, only the configuration of one side of the guide surface 82 in the reference direction A will be described below as a representative example. The second flat portion 85 extends from the gripping portion 30 in the reference direction A. The position of the second flat portion 85 in the orthogonal direction B corresponds to the second position Q described above. The end of the second flat portion 85 opposite the gripping portion 30 is connected to the inclined portion 84. The inclined portion 84 extends in a direction approaching the inspection surface 22 as it moves away from the gripping portion 30. The end of the inclined portion 84 opposite the second flat portion 85 is connected to the first flat portion 83. In other words, the first flat portion 83 is closer to the inspection surface 22 than the second flat portion 85 in the orthogonal direction B. The first flat portion 83 extends in the reference direction A. The position of the first flat portion 83 in the orthogonal direction B corresponds to the first position P described above.

[0022] The pin member 81 is fixed integrally to the movable body 51. The pin member 81 is attached at a position where it can slide on a guide surface 82 of the guide member 80. With the ultrasonic probe 6 biased toward the inspection surface 22 by the biasing member 7, the pin member 81 slides on the guide surface 82 in the reference direction A, whereby the position of the ultrasonic probe 6 in the orthogonal direction B changes between the first position P and the second position Q. Specifically, when the pin member 81 is located on a first flat portion 83 of the guide surface 82, the ultrasonic probe 6 is located at the first position P. At this time, the ultrasonic probe 6 is biased by the biasing member 7 and is in contact with the inspection surface 22. On the other hand, when the pin member 81 is located on a second flat portion 85 of the guide surface 82, the ultrasonic probe 6 is located at the second position Q (see FIG. 2 ). At this time, the ultrasonic probe 6 is separated from the inspection surface 22 against the biasing force of the biasing member 7.

[0023] (Configuration of spray device) The spray device 9 is a spray device for spraying a liquid agent such as water or oil toward the inspection surface 22. The spray device 9 is attached integrally to the movable body 51. The spray device 9 mainly sprays the liquid agent toward the inspection surface 22 when the movable body 51 is at the second position Q. By spraying the liquid agent onto the inspection surface 22, the adhesion between the ultrasonic probe 6 and the inspection surface 22 increases, making it possible to improve the inspection accuracy.

[0024] (Action and effect) Next, an example of how to use the fatigue test jig 1 will be described. When conducting a fatigue test, first, the moving body 51 is retracted to the second position Q, and a load is applied to the test object 2 by the load application unit 4. Note that a liquid agent may be sprayed onto the test surface 22 prior to the application of the load. After applying the load for a predetermined period or number of times, the screw shaft 50 is rotated to move the moving body 51 to the first position P. This brings the ultrasonic probe 6 into contact with the test surface 22. Note that the shoe 56 may be interposed between the ultrasonic probe 6 and the test surface 22 at this time. In this state, an ultrasonic flaw detection test is performed. If scratches or cracks due to the load are present on the test surface 22, their properties are observed by the ultrasonic flaw detection test. This fatigue test is repeatedly performed over a period of, for example, one week to several months. During the test, the moving body 51 is retracted to the second position Q, and a liquid agent is sprayed by the spray device 9. It is also possible to perform a fatigue test in which a load is repeatedly applied multiple times. In this case, too, when applying the load, the movable body 51 is retracted to the second position Q, and after the load application is completed, the movable body 51 is moved to the first position P to perform the ultrasonic flaw detection test.

[0025] In conventional devices, the ultrasonic probe 6 and the object to be inspected 2 are generally in constant contact with each other. For this reason, the object to be inspected 2 cannot be installed in the strength testing machine with the jig body 3 attached. In other words, for example, when repeatedly applying a load, the object to be inspected 2 must be removed from the strength testing machine each time. As a result, there is a problem that the contact position of the ultrasonic probe 6 shifts slightly each time a test is performed, making it impossible to perform accurate inspection and testing. To solve this problem, the present embodiment employs the above-described configurations.

[0026] According to the above configuration, when the load application unit 4 applies a load to the object under test 2, the ultrasonic probe 6 is retracted to the second position Q and separated from the inspection surface 22. On the other hand, after the load application is completed, the ultrasonic probe 6 is moved to the first position P and brought into contact with the inspection surface 22, thereby enabling fatigue testing. In other words, there is no need to detach the object under test 2 from the jig body 3 before and after the load application. This reduces the possibility of changes in the relative position between the ultrasonic probe 6 and the inspection surface 22 and other environmental conditions when performing a fatigue test that repeatedly applies loads. As a result, it becomes possible to conduct fatigue testing with higher accuracy over a long period of time. This further improves the reliability of fatigue test results and enables more precise strength design of the final product.

[0027] Furthermore, with the above configuration, the top 54 of the moving body 51 can be moved in the reference direction A along the screw shaft 50 simply by rotating the screw shaft 50 with the handle 53 serving as the driving device 52. In other words, a linear motion mechanism is formed by the screw shaft 50 and the driving device 52. In this way, the positions of the moving body 51 and the ultrasonic probe 6 can be freely changed with a simple configuration. Also, the position of the moving body 51 in the reference direction A can be precisely controlled based on the pitch of the screw shaft 50 and the number of rotations of the handle 53. Therefore, it is possible to expect even higher precision and accuracy when identifying defective areas on the inspection surface 22.

[0028] Furthermore, according to the above configuration, when the movable body 51 moves in the reference direction A between the first position P and the second position Q, the pin member 81 is guided while sliding on the guide surface 82. In other words, the guide member 80 and the pin member 81 function like a cam and a follower. As a result, the ultrasonic probe 6 abuts against the inspection surface 22 at the first position P, while the ultrasonic probe 6 is separated from the inspection surface 22 at the second position Q. In this way, it is possible to control the separation and contact between the ultrasonic probe 6 and the inspection surface 22 simply by moving the movable body 51 forward and backward in the reference direction A. Since such functions can be realized with a small number of parts, it is possible to improve the reliability of the device and also to keep manufacturing and maintenance costs low.

[0029] In addition, with the above configuration, when the movable body 51 is at the second position Q, that is, when a load is being applied to the object to be inspected 2, the spray device 9 can spray a liquid onto the inspection surface 22 prior to ultrasonic inspection. The presence of the liquid between the inspection surface 22 and the ultrasonic probe 6 increases the adhesion between them, improving the accuracy of the fatigue inspection. Furthermore, because the spray device 9 is integrally attached to the movable body 51, it is not necessary to remove the object to be inspected 2 from the jig body 3 in order to spray the liquid. Therefore, the relative position between the object to be inspected 2 and the ultrasonic probe 6 at the first position P where the fatigue inspection is performed does not change before and after the liquid spraying. As a result, the accuracy of the fatigue test can be further improved.

[0030] The first embodiment of the present disclosure has been described above. Note that various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure. For example, in the first embodiment, an example in which the object to be inspected 2 is T-shaped has been described. However, the shape of the object to be inspected 2 is not limited to this, and a simple plate-like or rod-like member, or other member having an L-shaped cross section, can also be used as the object to be inspected 2. In this case, it is possible to consider various changes to the shape and configuration of the load-applying unit 4.

[0031] Second Embodiment (Configuration of fatigue test system) Next, a fatigue testing system 200 according to a second embodiment of the present disclosure will be described with reference to Fig. 3. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted. The fatigue testing system 200 includes an environmental chamber 100 and a remote control mechanism 110 in addition to the fatigue test jig 1 described in the first embodiment.

[0032] (Configuration of environmental chamber) The environmental chamber 100 is a container having an internal storage space 101 for storing the fatigue test jig 1 and the specimen 2. In this environmental chamber 100, it is possible to change various environmental conditions such as the temperature, humidity, and pressure within the storage space 101. Specifically, a cryostat is used as the environmental chamber 100.

[0033] (Configuration of remote control mechanism) The remote control mechanism 110 is a mechanism that can externally operate the movement mechanism 5 and the load application unit 4 of the fatigue test fixture 1 in the accommodation space 101. Specifically, the remote control mechanism 110 has a servo motor 111 that drives the movement mechanism 5, and a controller 112 that is electrically connected to the servo motor 111, the load application unit 4, and the ultrasonic probe 6. An operator transmits appropriate commands to each device via the controller 112. These commands cause the application of a load, the movement of the moving body 51, and the operation of the ultrasonic probe 6 to be performed remotely.

[0034] (Action and effect) According to the above configuration, the moving mechanism 5 can be operated remotely while the fatigue test fixture 1, the load application unit 4, and the specimen 2 are housed in the environmental chamber 100. This allows the specimen 2 to be moved between the first position P and the second position Q while maintaining the environmental conditions inside the environmental chamber 100, such as the temperature, humidity, and pressure. In other words, it is possible to repeatedly apply a load to the specimen 2, or spray a liquid agent onto the inspection surface 22 when no load is being applied. In this way, various operations can be performed remotely without opening the environmental chamber 100, minimizing changes in the environmental conditions for each fatigue test. This further improves the accuracy of long-term fatigue tests.

[0035] The first embodiment of the present disclosure has been described above. Note that various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure. For example, in the second embodiment, an example was described in which a servo motor 111 is used as the drive device 52. However, a stepping motor or other electric motor can also be used as the drive device 52. Furthermore, similar to the first embodiment, members of various shapes can be used as the object to be inspected 2.

[0036] <Modifications common to all embodiments> Next, modifications common to each embodiment will be described with reference to FIGS. 4 and 5. A first modification of the fatigue test jig 1 can have a configuration as shown in FIG. 4. In the example shown in FIG. 4, the test object 2 is T-shaped, as in the first embodiment, but differs from the first embodiment in that a load is applied to both ends of the main body 20, rather than to the upright portion 21. The remaining configuration of the fatigue test jig 1 is the same as in the first embodiment. Furthermore, as shown in FIG. 5, a second modification is possible in which the tip of the ultrasonic probe 6 has an arc-shaped cross section, thereby enabling ultrasonic flaw detection of the rounded portion (corner) of the L-shaped test object 2. In this case, the ultrasonic probe 6 can be configured to be movable between a first position P and a second position Q by using the same moving mechanism 5 and guide mechanism 8 as in the above-described embodiments.

[0037] <Additional Notes> The fatigue test fixture 1 and the fatigue test system 200 described in each embodiment can be understood, for example, as follows.

[0038] (1) A fatigue test jig 1 according to a first embodiment includes a jig body 3 supporting an object to be inspected 2, a load application section 4 applying a load to the object to be inspected 2, a moving mechanism 5 integrally formed with the jig body 3 and having a moving body 51 that moves relative to the jig body 3 in a reference direction A along the inspection surface 22 of the object to be inspected 2, an ultrasonic probe 6 provided on the moving body 51, a biasing member 7 that applies a biasing force to the ultrasonic probe 6 toward the inspection surface 22, and a guide mechanism 8 that abuts the ultrasonic probe 6 against the inspection surface 22 in accordance with the biasing force when the moving body 51 is at a first position P in the reference direction A, and moves the ultrasonic probe 6 away from the inspection surface 22 against the biasing force when the moving body 51 is at a second position Q in the reference direction A.

[0039] According to the above configuration, when applying a load to the object to be inspected 2 by the load applying unit 4, the ultrasonic probe 6 is retracted to the second position Q, and when the load application is finished, the ultrasonic probe 6 is moved to the first position P and brought into contact with the inspection surface 22, thereby enabling fatigue testing. In other words, there is no need to detach the object to be inspected 2 from the jig body 3 before or after the load is applied. This reduces the possibility of environmental conditions changing when, for example, performing a fatigue test in which loads are applied repeatedly. As a result, it becomes possible to conduct fatigue testing with higher accuracy.

[0040] (2) The fatigue test jig 1 according to the second aspect is the fatigue test jig 1 of (1), wherein the moving mechanism 5 has a screw shaft 50 extending in the reference direction A and a drive device 52 that drives the screw shaft 50 to rotate around the central axis X, and the moving body 51 has a top 54 having a female thread that screws onto the screw shaft 50.

[0041] According to the above configuration, the top 54 of the moving body 51 can be moved in the reference direction A along the screw shaft 50 simply by rotating the screw shaft 50 with the driving device 52. In this way, the positions of the moving body 51 and the ultrasonic probe 6 can be freely changed with a simple configuration.

[0042] (3) The fatigue test jig 1 according to the third aspect is the fatigue test jig 1 of (1) or (2), wherein the guide mechanism 8 includes a guide member 80 extending in the reference direction A and having a guide surface 82 formed thereon that extends away from the inspection surface 22 as it moves from the first position P toward the second position Q, and a pin member 81 provided on the movable body 51 and sliding along the guide surface 82 of the guide member 80.

[0043] According to the above configuration, when the movable body 51 moves in the reference direction A between the first position P and the second position Q, the pin member 81 is guided while sliding on the guide surface 82. As a result, the ultrasonic probe 6 abuts on the inspection surface 22 at the first position P, while the ultrasonic probe 6 is separated from the inspection surface 22 at the second position Q. In this way, it is possible to control the separation and contact between the ultrasonic probe 6 and the inspection surface 22 simply by moving the movable body 51 forward and backward in the reference direction A.

[0044] (4) The fatigue test jig 1 of the fourth aspect is a fatigue test jig 1 of any one of the aspects (1) to (3), and further includes a spray device 9 provided on the movable body 51 and capable of spraying a liquid agent toward the inspection surface 22 when the movable body 51 is in the second position Q.

[0045] According to the above configuration, when the movable body 51 is at the second position Q, that is, when a load is being applied to the object to be inspected 2, the liquid can be sprayed onto the inspection surface 22 prior to ultrasonic flaw detection. The presence of the liquid between the inspection surface 22 and the ultrasonic probe 6 improves the accuracy of the fatigue inspection. In addition, there is no need to remove the object to be inspected 2 from the jig body 3 in order to spray the liquid. Therefore, the relative positions of the object to be inspected 2 and the ultrasonic probe 6 at the first position P where the fatigue inspection is performed do not change before and after the liquid spraying. As a result, the accuracy of the fatigue test can be further improved.

[0046] (5) A fatigue testing system 200 according to a fifth aspect includes a fatigue testing jig 1 according to any one of aspects (1) to (4), an environmental chamber 100 having an inspection space in which the fatigue testing jig 1, the load application section 4, and the test object 2 are accommodated, and a remote control mechanism 110 capable of operating the moving mechanism 5 from outside the environmental chamber 100.

[0047] According to the above configuration, the moving mechanism 5 can be operated by remote control while the fatigue test fixture 1, the load application unit 4, and the specimen 2 are housed in the environmental chamber 100. This allows the specimen 2 to be moved between the first position P and the second position Q while maintaining the conditions inside the environmental chamber 100. In other words, it is possible to repeatedly apply a load to the specimen 2 and spray a liquid agent onto the inspection surface 22 when no load is being applied. This minimizes changes in the environmental conditions for each test, further improving the accuracy of the fatigue test. [Explanation of symbols]

[0048] 1...Fatigue test fixture 2...Inspection object 3...Jig body 4...Load application section 5…Movement mechanism 6...Ultrasonic probe 7... Urging member 8...Guide mechanism 9...Spray device 20...Main body 21...Upright section 22...Inspection surface 30...Gripping part 31...Stage section 32...Screw hole 33...Fixing screw 40…Zipper 50...Screw shaft 51...Mobile 52...Drive unit 53...Handle 54...frame 55...Mobile body 56...Shoo 80...Guide member 81...Pin member 82...Guide surface 83...First flat part 84…Slope part 85…Second flat part 100...Environmental tank 101...containment space 110...Remote control mechanism 111...Servo motor 112...Controller 200...Fatigue test system A…Reference direction B: Perpendicular direction P…first position Q…Second position X…center axis

Claims

1. a jig body for supporting the object to be inspected; a load applying unit that applies a load to the object to be inspected; a moving mechanism provided integrally with the jig body and having a moving body that moves relative to the jig body in a reference direction along the inspection surface of the object to be inspected; an ultrasonic probe provided on the moving body; a biasing member that applies a biasing force to the ultrasonic probe toward the inspection surface; a guide mechanism that brings the ultrasonic probe into contact with the inspection surface in accordance with the biasing force when the movable body is at a first position in the reference direction, and moves the ultrasonic probe away from the inspection surface against the biasing force when the movable body is at a second position in the reference direction; A fatigue test fixture comprising:

2. The movement mechanism includes a screw shaft extending in the reference direction; a drive device that drives the screw shaft to rotate around its central axis; and 2. The fatigue test jig according to claim 1, wherein the moving body has a top having a female thread formed thereon to be threaded onto the screw shaft.

3. The guide mechanism includes: a guide member having a guide surface formed thereon, the guide surface extending in the reference direction and extending so as to move away from the inspection surface as the guide member moves from the first position to the second position; a pin member provided on the movable body and sliding along the guide surface of the guide member; 3. The fatigue test fixture according to claim 1, further comprising:

4. 2. The fatigue test fixture according to claim 1, further comprising a spray device provided on the movable body and capable of spraying a liquid agent toward the inspection surface when the movable body is in the second position.

5. The fatigue test fixture according to claim 1; an environmental chamber having an inspection space in which the fatigue test jig and the test object are accommodated; a remote control mechanism capable of operating the movement mechanism from outside the environmental chamber; A fatigue testing system comprising:

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