JP7781044B2 - Fatigue test fixture and fatigue test system - Google Patents

Description

This disclosure relates to a fatigue test fixture and a fatigue test system.

Tests in which tensile or compressive loads are applied to the test object are widely conducted to measure the fatigue strength of metallic materials and composite materials. A specific example of equipment used for this type of test is described in Patent Document 1 below. This equipment is equipped with a probe that can move along the side of the test object. After applying a load to the test object, the probe is moved to the test position and ultrasonic testing is performed.

Japanese Utility Model Application Laid-Open Publication No. 4-43262

However, with the device described in Patent Document 1, the probe and the object being inspected are constantly in contact. For this reason, the inspection device cannot be installed in a strength testing machine while still attached. This means that, for example, when repeatedly applying loads, the inspection device must be removed from the strength testing machine each time. As a result, the position where the probe comes into contact may shift slightly each time a test is performed, which could make it impossible to perform accurate inspections and tests.

The present disclosure has been made to solve the above-mentioned problems, and aims to provide a fatigue test jig and fatigue test system that enable more accurate fatigue testing.

In order to solve the above problems, the fatigue testing jig disclosed herein comprises a jig main body that supports an object to be inspected, a load application unit that applies a load to the object to be inspected, a movement mechanism that is integral 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 attached to the moving body, a biasing member that applies a biasing force to the ultrasonic probe toward the inspection surface, and a guide mechanism that brings the ultrasonic probe into contact with 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.

This disclosure provides a fatigue test jig and a fatigue test system that enable more accurate fatigue testing.

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. 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. FIG. 10 is a schematic diagram showing the configuration of a fatigue testing system according to a second embodiment of the present disclosure. 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. 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.

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

(Configuration of the object to be inspected)
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.

(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 .

(Configuration of 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 portions 30 that grip the main body portion 20 of the object to be inspected 2 on both sides in the reference direction A, and a stage portion 31 that connects the gripping portions 30 to each other in the reference direction A. The gripping portions 30 extend in a direction intersecting the reference direction A. Desirably, the gripping portions 30 extend in a direction perpendicular to the reference direction A. In the following description, the direction perpendicular to the reference direction A (i.e., the direction in which the above-mentioned standing portions 21 extend) is referred to as the orthogonal direction B. The object to be inspected 2 is gripped at one end of the gripping portions 30 in the orthogonal direction B.

The stage portion 31 connects the ends of the pair of gripping portions 30 on one side in the orthogonal direction B in the reference direction A. Therefore, a space is formed between the pair of gripping portions 30 and the stage portion 31. A screw hole 32 is formed in the center of the stage portion 31 in the reference direction A. A fixing screw 33 fixed to the workbench is threaded into this screw hole 32. In other words, the jig body 3 is fixed so that it does not move relative to the workbench.

(Configuration of Load-Applying Section)
The load applying unit 4 has a chuck 40 that clamps the standing portion 21 of the inspection object 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.

(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 thread. 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.

The moving body 51 has a top 54 and a moving body main body 55. The top 54 has a female thread that screws into 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 reference direction A. The moving body main body 55 is integrally formed with this top 54. In other words, the moving body main body 55 can move together with the top 54 in reference direction A. The moving body main body 55 is fixed to one side of the top 54 in the orthogonal direction B.

A biasing member 7 and an ultrasonic probe 6 are attached to the movable body main body 55. 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 of the orthogonal direction B, i.e., toward the inspection surface 22 of the object to be inspected 2. Note that while the example in Figure 1 shows an example in which a shoe 56 is interposed between the ultrasonic probe 6 and the inspection surface 22, the shoe 56 can also be omitted.

(Configuration of ultrasonic probe)
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.

(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.

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 the 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.

Because the guide surface 82 is symmetrical with respect to the center of the reference direction A as the axis of symmetry, the following description will representatively focus on the configuration of only one side of the guide surface 82 in the reference direction A. 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.

The pin member 81 is fixed integrally to the movable body 51. The pin member 81 is attached in a position that allows it to slide on the 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, causing the position of the ultrasonic probe 6 in the orthogonal direction B to change between the first position P and the second position Q. Specifically, when the pin member 81 is on the first flat portion 83 of the guide surface 82, the ultrasonic probe 6 is at the first position P. At this time, the ultrasonic probe 6 is biased by the biasing member 7 and abuts against the inspection surface 22. On the other hand, when the pin member 81 is on the second flat portion 85 of the guide surface 82, the ultrasonic probe 6 is at the second position Q (see Figure 2). At this time, the ultrasonic probe 6 is spaced apart from the inspection surface 22 against the biasing force of the biasing member 7.

(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 is increased, making it possible to improve the inspection accuracy.

(Action and effect)
Next, an example of how to use the fatigue test fixture 1 will be described. When conducting a fatigue test, first, the movable 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 movable 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 movable 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.

In conventional devices, the ultrasonic probe 6 and the object to be inspected 2 are generally in constant contact. 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, when repeatedly applying loads, for example, the object to be inspected 2 must be removed from the strength testing machine each time. As a result, the contact position of the ultrasonic probe 6 shifts slightly each time a test is performed, making it impossible to perform accurate inspections and tests. To solve this problem, the present embodiment employs the configurations described above.

With the above configuration, when a load is applied 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 the ultrasonic probe 6 is moved away from the inspection surface 22. On the other hand, once the load application is complete, the ultrasonic probe 6 is moved to the first position P and brought into contact with the inspection surface 22, allowing for 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 changes in the relative position between the ultrasonic probe 6 and the inspection surface 22 or other environmental conditions when performing a fatigue test that repeatedly applies loads. As a result, it becomes possible to conduct fatigue testing with greater 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.

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 drive device 52. In other words, the screw shaft 50 and drive device 52 form a linear motion mechanism. In this way, the positions of the moving body 51 and the ultrasonic probe 6 can be freely changed with a simple configuration. In addition, 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 achieve even greater precision and accuracy when identifying defects on the inspection surface 22.

Furthermore, with 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 along the guide surface 82. In other words, the guide member 80 and pin member 81 function like a cam and 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 back and forth in the reference direction A. Achieving such functionality with a small number of parts improves the reliability of the device and also makes it possible to keep manufacturing and maintenance costs low.

In addition, with the above configuration, when the movable body 51 is at the second position Q, i.e., 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 testing. The presence of the liquid between the inspection surface 22 and the ultrasonic probe 6 increases adhesion between them, improving the accuracy of the fatigue inspection. Furthermore, because the spray device 9 is integrally attached to the movable body 51, 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 position of the object to be inspected 2 and the ultrasonic probe 6 at the first position P where fatigue testing is performed does not change before or after the liquid spray. As a result, the accuracy of the fatigue test can be further improved.

The above describes the first embodiment of the present disclosure. Note that various changes and modifications can be made to the above configuration without departing from the spirit and scope of the present disclosure. For example, in the above first embodiment, an example was described in which the object to be inspected 2 is T-shaped. However, the shape of the object to be inspected 2 is not limited to this, and it is possible to use a simple plate-shaped or rod-shaped member, or other member with an L-shaped cross section, as the object to be inspected 2. In such cases, it is possible to consider various changes to the shape and configuration of the load-applying portion 4.

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 description 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 fixture 1 described in the first embodiment.

(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.

(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 within 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 remotely control the application of a load, the movement of the moving body 51, and the operation of the ultrasonic probe 6.

(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, such as the temperature, humidity, and pressure, 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. 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 testing.

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

<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 the configuration 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 embodiments.

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

(1) A fatigue test jig 1 according to a first aspect includes a jig body 3 supporting an object to be inspected 2, a load application unit 4 applying a load to the object to be inspected 2, a moving mechanism 5 integrally provided 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 brings the ultrasonic probe 6 into contact with 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.

With the above configuration, when applying a load to the test object 2 using the load application unit 4, the ultrasonic probe 6 is retracted to the second position Q, and when the load application is complete, the ultrasonic probe 6 is moved to the first position P and brought into contact with the test surface 22, allowing fatigue testing to be performed. In other words, there is no need to detach the test object 2 from the jig body 3 before or after the load is applied. This reduces the possibility of environmental conditions changing, for example, when performing a fatigue test in which loads are applied repeatedly. As a result, fatigue testing can be performed with greater precision.

(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 formed with a female thread that screws onto the screw shaft 50.

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 drive device 52. In this way, the positions of the moving body 51 and the ultrasound probe 6 can be freely changed with a simple configuration.

(3) The fatigue test fixture 1 according to the third aspect is the fatigue test fixture 1 according to (1) or (2), wherein the guide mechanism 8 includes a guide member 80 that extends in the reference direction A and has 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 that is provided on the movable body 51 and slides along the guide surface 82 of the guide member 80.

With 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 along the guide surface 82. 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.

(4) The fatigue test jig 1 according to the fourth aspect is the fatigue test jig 1 according to any one of 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.

With the above configuration, when the movable body 51 is at the second position Q, i.e., when a load is being applied to the object to be inspected 2, a liquid agent can be sprayed onto the inspection surface 22 prior to ultrasonic testing. The presence of the liquid agent 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 agent. 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 or after the liquid agent spraying. As a result, the accuracy of the fatigue test can be further improved.

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

With the above configuration, the moving mechanism 5 can be operated remotely while the fatigue test fixture 1, load application unit 4, and 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, or spray a liquid onto the inspection surface 22 when no load is being applied. This minimizes changes in environmental conditions between tests, further improving the accuracy of fatigue testing.

DESCRIPTION OF SYMBOLS 1...Fatigue test jig 2...Test object 3...Jig main body 4...Load application section 5...Moving mechanism 6...Ultrasonic probe 7...Biasing member 8...Guide mechanism 9...Spraying device 20...Main body 21...Upright section 22...Inspection surface 30...Gripping section 31...Stage section 32...Threaded hole 33...Fixing screw 40...Chuck 50...Screw shaft 51...Moving body 52...Drive device 53...Handle 54...Top 55...Moving body main body 56...Shoe 80...Guide member 81...Pin member 82...Guide surface 83...First flat section 84...Inclined section 85...Second flat section 100...Environmental chamber 101...Storage space 110...Remote control mechanism 111...Servo motor 112...Controller 200...Fatigue test system A...Reference direction B...Orthogonal direction P...First position Q...Second position X...Central axis

Claims (5)

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: 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. 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: The fatigue test fixture described in claim 1 further comprises a spray device attached to the movable body and capable of spraying a liquid agent toward the inspection surface when the movable body is in the second position. 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: