Fatigue test method under lateral force load condition

Abstract

The invention provides a fatigue test method under a lateral force load condition. The fatigue test method comprises the following steps: S1, connecting a to-be-tested piece between an upper fixed seat and a lower fixed seat; s2, driving a horizontal push rod to abut against the middle part of the to-be-tested piece through a double-guide-rod driving assembly; s3, obtaining the reading F1 of the first pressure sensor and the readings F2 and F3 of the two second pressure sensors, and calculating the lateral pressure F applied to the to-be-tested piece by the horizontal push rod 50; s4, the double-guide-rod driving assembly is driven, so that the lateral pressure F reaches a preset value F0; s5, driving the upper fixing seat to perform fatigue test on the to-be-tested piece; and S6, when the to-be-tested piece generates fatigue fracture, recording fatigue test data, and completing the fatigue test. According to the method, testing steps under two working conditions are provided, one is fatigue testing performed under the condition of keeping continuous lateral load, the other is fatigue testing performed under the condition of single lateral load, and the method can be matched with different use working conditions, so that a fatigue testing result closer to the real working condition can be obtained.

Description

Technical Field

[0001] This invention relates to the field of fatigue testing technology, and in particular to a fatigue testing method under lateral force loading conditions. Background Technology

[0002] Conventional fatigue testing systems perform axial tensile and compressive fatigue tests on fatigue specimens. No transverse stress load is applied during the test, so the test results only contain fatigue data in the axial direction of the test specimen.

[0003] Based on this current technological situation, the applicant has developed a fatigue testing system with lateral stress loads. However, this fatigue testing system still faces the problem of how to calibrate and detect lateral stress loads. Previously, there was no technical solution for calibrating and detecting lateral stress, making it impossible to accurately obtain fatigue test data under lateral stress conditions. Therefore, this technical problem needs to be solved. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a fatigue testing method under lateral force loading conditions, thereby solving the problem that existing fatigue testing equipment cannot calibrate and detect lateral stress, and therefore cannot accurately obtain fatigue test data under lateral stress.

[0005] To address the aforementioned technical problems, this invention provides a fatigue testing method under lateral force loading conditions, based on a fatigue testing system with lateral stress loading, comprising: S1. Connect the test piece (10) between the upper fixed base (12) and the lower fixed base (11); S2. Drive the horizontal push rod (50) to abut against the middle of the test piece (10) by the dual guide rod drive assembly (40); S3. Obtain the reading F1 of the first pressure sensor (40a) and the readings F2 and F3 of the two second pressure sensors, and calculate the lateral pressure F applied by the horizontal push rod (50) to the test piece (10), F = F1 - F2 - F3; S4. Drive the dual guide rod drive assembly (40) to make the lateral pressure F reach the preset value F0; S5. Drive the upper fixed seat (12) to perform fatigue testing on the test piece (10); S6. During step S5, the lateral pressure F is maintained at a preset value by driving the double guide rod drive assembly (40) until the test piece (10) undergoes fatigue fracture. S7. Record fatigue test data and complete the fatigue test.

[0006] It also includes a controller and a servo motor. The servo motor is used to drive the rotation of the drive handle, and the controller is used to control the servo motor according to the lateral pressure F. When F < F0 - δ, control the servo motor to drive the drive handle, so that the horizontal push rod (50) moves forward until F = F0; δ is the preset error value.

[0007] A speed reducer is also provided between the drive handle and the servo motor to reduce the output speed.

[0008] A fatigue testing method under lateral force loading conditions, based on a fatigue testing system with lateral stress loading, includes: S1. Connect the test piece (10) between the upper fixed base (12) and the lower fixed base (11); S2. Drive the horizontal push rod (50) to abut against the middle of the test piece (10) by the dual guide rod drive assembly (40); S3. Obtain the reading F1 of the first pressure sensor (40a) and the readings F2 and F3 of the two second pressure sensors, and calculate the lateral pressure F applied by the horizontal push rod (50) to the test piece (10), F = F1 - F2 - F3; S4. Drive the dual guide rod drive assembly (40) to make the lateral pressure F reach the preset value F0; S5. Drive the upper fixed seat (12) to perform fatigue testing on the test piece (10); S6. When the test piece (10) experiences fatigue fracture, record the fatigue test data to complete the fatigue test.

[0009] A fatigue testing system with lateral stress load includes a lower fixed seat (11), an upper fixed seat (12), and a horizontal push rod (50). The lower fixed seat (11) is connected to the base of the testing machine, and the upper fixed seat (12) is connected to the power output end of the testing machine. The upper fixed seat (12) and the lower fixed seat (11) clamp the upper and lower ends of the test piece (10). The horizontal push rod (50) is horizontally arranged between the upper fixed seat (12) and the lower fixed seat (11) and can move in the horizontal direction and contact the middle of the test piece (10) to apply a horizontal thrust to the test piece (10). The magnitude of the thrust is obtained through a pressure sensor.

[0010] The horizontal push rod (50) is connected to a fixed structure in the lower fixed seat (11) and the upper fixed seat (12), so that the height of the horizontal push rod (50) remains unchanged relative to the structure.

[0011] The fatigue testing system also includes: The system comprises a saddle seat (20), a fixed guide frame (30), a dual guide rod drive assembly (40), and a thrust measurement module. The saddle seat (20) is fitted onto the lower fixed seat (11), and the side of the saddle seat (20) is a vertical fixed surface for fixed connection with the fixed guide frame (30). The fixed guide frame (30) is a horizontally arranged square frame structure, and the height of the main body of the fixed guide frame (30) corresponds to the position between the upper fixed seat (12) and the lower fixed seat (11). The dual guide rod drive assembly (40) is connected to the fixed guide frame (30) and is used to drive the horizontal push rod (50) to move in the horizontal direction. The thrust measurement module is used to indirectly measure the stress between the horizontal push rod (50) and the test piece (10).

[0012] The saddle seat (20) includes a U-shaped seat (21) and a fixed side plate (22). The groove diameter of the U-shaped seat (21) is adapted to the column diameter of the lower fixed seat (11). The side fixed plate (22) is connected to the side of the U-shaped seat (21) to fix the U-shaped seat (21) to the column of the lower fixed seat (11).

[0013] The fixed guide frame (30) includes a fixed support plate (31), two guide optical axes (32) and a guide support plate (33). The two guide optical axes (32) are arranged in parallel vertically. The guide support plate (33) is fixedly connected to the fixed support plate (31) through the two guide optical axes (32) to form a rectangular frame structure. Both guide optical axes (32) point to the test piece (10). The height position of the fixed support plate (31) relative to the side fixed plate (22) is adjustable, so that the contact position between the horizontal push rod (50) driven by the dual guide rod drive assembly (40) and the test piece (10) is adjustable, thereby obtaining fatigue test data of lateral stress load at different contact positions of the test piece (10).

[0014] The dual-guide rod drive assembly (40) includes a threaded drive rod (41), a vertical drive plate (42), a horizontal push plate (43), a balance spring (44), and two sliding guide rods (45). The threaded drive rod (41) is threadedly connected to the symmetrical axis of the two guide optical axes (32) on the guide support plate (33). The vertical drive plate (42) is vertically arranged and slidably connected to the upper and lower guide optical axes (32). The front end of the threaded drive rod (41) abuts against the middle position of the vertical drive plate (42). The two sliding guide rods (45) are horizontally arranged and symmetrical about the two sides of the center plane of the two guide optical axes (32). The rear end of the sliding guide rod (45) is fixedly connected to the horizontal push plate (43). The two sliding guide rods (45) slidably pass through the sliding shaft hole on the fixed support plate (31). Each balance spring (44) is correspondingly sleeved. On the sliding guide rod (45), and located between the fixed support plate (31) and the horizontal push plate (43); the vertical drive plate (42) abuts against the horizontal push plate (43) through the first pressure sensor (40a), and each of the balance springs (44) is connected to the horizontal push plate (43) or the fixed support plate (31) through a second pressure sensor; the front ends of the two sliding guide rods (45) are connected to the horizontal push rod (50); the thrust measurement module is composed of the first pressure sensor (40a) and the two second pressure sensors, and the thrust measurement module calculates the pressure difference between the pressure F1 obtained by the first pressure sensor (40a) and the pressures F2 and F3 obtained by the two second pressure sensors: F1-F2-F3 to obtain the stress between the horizontal push rod (50) and the test piece (10).

[0015] The two guide optical axes (32), the two sliding guide rods (45) and the threaded drive rod (41) form a symmetrical cross shape in space. That is, the threaded drive rod (41) is located at the center of the two guide optical axes (32) in the vertical direction and at the center of the two sliding guide rods (45) in the horizontal direction.

[0016] The threaded drive rod (41) has a drive handle (46) at its rear end. The drive handle (46) is connected to a servo drive motor. The servo drive motor is used to control the drive handle (46) to rotate according to the pressure difference F1-F2-F3 obtained by the thrust measurement module, so as to make the threaded drive rod (41) move forward or backward.

[0017] The front end of the threaded drive rod (41) is connected to the vertical drive plate (42) via a rotating bearing.

[0018] The front end of the sliding guide rod (45) is connected to the test piece (10) via an adapter.

[0019] The adapter includes a first mating block (47) and a second mating block (48). The two mating blocks form a circular hole after mating, which is connected to the horizontal push rod (50). The rear end of the first mating block (47) is fixedly connected to the front end of the sliding rod (45).

[0020] The fatigue testing method under lateral force load conditions provided by this invention offers two testing procedures: one is a fatigue test conducted under continuous lateral load conditions, and the other is a fatigue test conducted under a single lateral load condition. This method can be adapted to different operating conditions, thereby obtaining fatigue test results that are closer to real-world conditions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the fatigue testing system with lateral stress load according to an embodiment of the present invention.

[0022] Figure 2 for Figure 1 The corresponding sectional view.

[0023] Figure 3 for Figure 1 The corresponding side view. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] likeFigures 1-3 As shown, the present invention provides a fatigue testing system with lateral stress load, including a lower fixed seat 11, an upper fixed seat 12, and a horizontal push rod 50. The lower fixed seat 11 is connected to the base of the testing machine, and the upper fixed seat 12 is connected to the power output end of the testing machine. The upper fixed seat 12 and the lower fixed seat 11 clamp the upper and lower ends of the test piece 10. The horizontal push rod 50 is horizontally arranged between the upper fixed seat 12 and the lower fixed seat 11 and can move in the horizontal direction to contact the middle of the test piece 10 to apply a horizontal thrust to the test piece 10. The magnitude of the thrust is obtained through a pressure sensor.

[0028] The horizontal push rod 50 is connected to a fixed structure among the lower fixed seat 11 and the upper fixed seat 12, so that the height of the horizontal push rod 50 remains unchanged relative to the structure.

[0029] The fatigue testing system also includes: The system comprises a saddle seat 20, a fixed guide frame 30, a dual-guide rod drive assembly 40, and a thrust measurement module. The saddle seat 20 is fitted onto the lower fixed seat 11, and the side of the saddle seat 20 is a vertical fixed surface for fixed connection with the fixed guide frame 30. The fixed guide frame 30 is a horizontally arranged rectangular frame structure, and the height of the main body of the fixed guide frame 30 corresponds to the position between the upper fixed seat 12 and the lower fixed seat 11. The dual-guide rod drive assembly 40 is connected to the fixed guide frame 30 and is used to drive the horizontal push rod 50 to move in the horizontal direction. The thrust measurement module is used to indirectly measure the stress between the horizontal push rod 50 and the test piece 10.

[0030] The saddle seat 20 includes a U-shaped seat 21 and a fixed side plate 22. The groove diameter of the U-shaped seat 21 is adapted to the column diameter of the lower fixed seat 11. The side fixed plate 22 is connected to the side of the U-shaped seat 21 to fix the U-shaped seat 21 to the column of the lower fixed seat 11.

[0031] The fixed guide frame 30 includes a fixed support plate 31, two guide optical axes 32, and a guide support plate 33. The two guide optical axes 32 are arranged vertically in parallel. The guide support plate 33 is fixedly connected to the fixed support plate 31 through the two guide optical axes 32 to form a rectangular frame structure. Both guide optical axes 32 point to the test piece 10. The height position of the fixed support plate 31 relative to the side fixed plate 22 is adjustable, thereby adjusting the contact position between the horizontal push rod 50 driven by the dual guide rod drive assembly 40 and the test piece 10, thereby obtaining fatigue test data of lateral stress load at different contact positions of the test piece 10.

[0032] The dual-guide rod drive assembly 40 includes a threaded drive rod 41, a vertical drive plate 42, a horizontal push plate 43, a balance spring 44, and two sliding guide rods 45. The threaded drive rod 41 is threadedly connected to the symmetrical axes of two guide optical axes 32 on the guide support plate 33. The vertical drive plate 42 is vertically arranged and slidably connected to the upper and lower guide optical axes 32. The front end of the threaded drive rod 41 abuts against the middle position of the vertical drive plate 42. The two sliding guide rods 45 are horizontally arranged and symmetrical about the two sides of the center plane of the two guide optical axes 32. The rear end of the sliding guide rods 45 is fixedly connected to the horizontal push plate 43. The two sliding guide rods 45 slidably pass through sliding shaft holes on the fixed support plate 31. Each balance spring 44 is correspondingly sleeved on the sliding guide rod. The guide rod 45 is located between the fixed support plate 31 and the horizontal push plate 43; the vertical drive plate 42 abuts against the horizontal push plate 43 through the first pressure sensor 40a; each balance spring 44 is connected to the horizontal push plate 43 or the fixed support plate 31 through a second pressure sensor; the front ends of the two sliding guide rods 45 are connected to the horizontal push rod 50; the thrust measurement module is composed of the first pressure sensor 40a and the two second pressure sensors, and the thrust measurement module calculates the pressure difference between the pressure F1 obtained by the first pressure sensor 40a and the pressures F2 and F3 obtained by the two second pressure sensors: F1-F2-F3 to obtain the stress between the horizontal push rod 50 and the test piece 10.

[0033] The saddle seat 20 is primarily fixed to the lower fixed seat 11, with the upper fixed seat 12 corresponding to it. Both the upper fixed seat 12 and the lower fixed seat 11 have cylindrical surfaces with push rods mounted at their centers, thus balancing the lateral forces and maintaining the overall fixture's stability. The fixed guide frame 30 is fixedly connected to the saddle seat 20 from the side, providing a mounting and working foundation for the dual-guide rod drive assembly 40. This allows the dual-guide rod drive assembly 40 to be positioned between the lower fixed seat 11 and the upper fixed seat 12. The fixed guide frame 30 forms a rectangular frame structure, with two horizontally arranged guide shafts 32 providing a moving track for the horizontal movement of the dual-guide rod drive assembly 40. The dual-guide rod drive assembly 40 is driven by a threaded drive rod 41. The two sliding guide rods 45 on both sides move horizontally along the two guide optical axes 32 of the fixed guide frame 30. The dual guide rod drive assembly 40 uses the vertical drive plate 42 to drive the horizontal push plate 43 to realize the transformation from the action of one threaded drive rod 41 to the action of two symmetrical sliding guide rods 45. The first pressure sensor 40a is set between the vertical drive plate 42 and the horizontal push plate 43, so that the total pressure applied by the threaded drive rod 41 can be detected. Furthermore, the pressure values ​​of the two second pressure sensors are detected by the two balance springs 44, so as to obtain the thrust obtained by the front horizontal push rod 50. During this period, the two balance springs can balance the forces on the left and right sliding guide rods 45 to avoid unilateral tilting.

[0034] The vertical drive plate 42 is provided with a shaft hole that allows the guide optical axis 32 to pass through, and a sliding sleeve can be provided on the inner wall of the shaft hole to reduce the frictional resistance of the guide optical axis 32; correspondingly, a shaft hole that allows the sliding guide rod 45 to pass through is also provided on the fixed support plate 31 between the two sliding guide rods 45 and the fixed support plate 31, and a sliding sleeve structure is also provided in the shaft hole.

[0035] The two guide optical axes 32, the two sliding guide rods 45, and the threaded drive rod 41 form a symmetrical cross shape in space. That is, the threaded drive rod 41 is located at the center of the two guide optical axes 32 in the vertical direction and at the center of the two sliding guide rods 45 in the horizontal direction.

[0036] The threaded drive rod 41 has a drive handle 46 at its rear end. The drive handle 46 is connected to a servo drive motor. The servo drive motor is used to control the rotation of the drive handle 46 according to the pressure difference F1-F2-F3 obtained by the thrust measurement module, so as to make the threaded drive rod 41 move forward or backward.

[0037] The front end of the threaded drive rod 41 is connected to the vertical drive plate 42 through a rotating bearing. The rotating bearing can reduce the rotational frictional resistance of the threaded drive rod 41.

[0038] The front end of the sliding guide rod 45 is connected to the test piece 10 via an adapter.

[0039] The adapter includes a first mating block 47 and a second mating block 48. The two mating blocks form a circular hole after mating, which is used to connect with the horizontal push rod 50. The rear end of the first mating block 47 is fixedly connected to the front end of the sliding rod 45.

[0040] The fatigue testing system with lateral stress load provided by the present invention applies a horizontal load to the test piece by a horizontal push rod that contacts the test piece laterally, and obtains the magnitude of the push force through a pressure sensor. Then, a horizontal lateral load is continuously applied during the fatigue test to obtain fatigue test data under lateral stress load conditions, which can simulate fatigue life under complex stress conditions.

[0041] The present invention also provides a fatigue testing method under lateral force loading conditions, providing test steps for two working conditions. One is a fatigue test performed under continuous lateral load conditions, and the other is a fatigue test performed under a single lateral load condition. This method can be adapted to different operating conditions, thereby obtaining fatigue test results that are closer to real operating conditions.

[0042] The fatigue testing method under lateral force loading conditions provided in this embodiment of the invention, based on the fatigue testing system with lateral stress loading described above, includes: S1. Connect the test piece 10 between the upper fixed base 12 and the lower fixed base 11; S2. The horizontal push rod 50 is driven by the dual guide rod drive assembly 40 to abut against the middle of the test piece 10. S3. Obtain the reading F1 of the first pressure sensor 40a and the readings F2 and F3 of the two second pressure sensors, and calculate the lateral pressure F applied by the horizontal push rod 50 to the test piece 10, F = F1 - F2 - F3; S4. Drive the dual guide rod drive assembly 40 to make the lateral pressure F reach the preset value F0; S5. Drive the upper fixed seat 12 to perform fatigue testing on the test piece 10; S6. During step S5, the lateral pressure F is maintained at a preset value by driving the dual guide rod drive assembly 40 until the test piece 10 undergoes fatigue fracture. S7. Record fatigue test data and complete the fatigue test.

[0043] The fatigue testing method under lateral force load provided in this embodiment of the invention obtains pressure values ​​from multiple pressure sensors to calculate the imaging force load, and then controls the contact force (i.e., lateral pressure) between the horizontal push rod and the test piece through a servo motor via a drive handle, so that the test piece can maintain the magnitude of the lateral pressure after bending, thereby simulating fatigue testing under continuous lateral force load conditions.

[0044] It also includes a controller and a servo motor. The servo motor is used to drive the rotation of the drive handle, and the controller is used to control the servo motor according to the lateral pressure F. When F < F0 - δ, control the servo motor to drive the drive handle, so that the horizontal push rod 50 moves forward until F = F0; δ is the preset error value.

[0045] A speed reducer is also provided between the drive handle and the servo motor to reduce the output speed.

[0046] This invention also provides a fatigue testing method under lateral force loading conditions, based on the fatigue testing system with lateral stress loading described above, including: S1. Connect the test piece 10 between the upper fixed base 12 and the lower fixed base 11; S2. The horizontal push rod 50 is driven by the dual guide rod drive assembly 40 to abut against the middle of the test piece 10. S3. Obtain the reading F1 of the first pressure sensor 40a and the readings F2 and F3 of the two second pressure sensors, and calculate the lateral pressure F applied by the horizontal push rod 50 to the test piece 10, F = F1 - F2 - F3; S4. Drive the dual guide rod drive assembly 40 to make the lateral pressure F reach the preset value F0; S5. Drive the upper fixed seat 12 to perform fatigue testing on the test piece 10; S6. When the test piece 10 experiences fatigue fracture, record the fatigue test data to complete the fatigue test.

[0047] The fatigue testing method under lateral force load provided in this embodiment of the invention differs from the first fatigue testing method in that the lateral pressure load is applied only once. After the horizontal push rod deforms under the lateral pressure load, the lateral pressure load also decreases or is cleared to zero, thereby simulating the fatigue load under the working condition after a single external force load.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A fatigue testing method under lateral force loading conditions, based on A fatigue testing system with lateral stress load, characterized in that it comprises: S1. Connect the test piece (10) between the upper fixed base (12) and the lower fixed base (11); S2. Drive the horizontal push rod (50) to abut against the middle of the test piece (10) by the dual guide rod drive assembly (40); S3. Obtain the reading F1 of the first pressure sensor (40a) and the readings F2 and F3 of the two second pressure sensors, and calculate the lateral pressure F applied by the horizontal push rod (50) to the test piece (10), F = F1 - F2 - F3; S4. Drive the dual guide rod drive assembly (40) to make the lateral pressure F reach the preset value F0; S5. Drive the upper fixed seat (12) to perform fatigue testing on the test piece (10); S6. During step S5, the lateral pressure F is maintained at a preset value by driving the double guide rod drive assembly (40) until the test piece (10) undergoes fatigue fracture. S7. Record fatigue test data and complete the fatigue test.

2. The fatigue testing method under lateral force loading conditions according to claim 1, characterized in that, It also includes a controller and a servo motor. The servo motor is used to drive the rotation of the drive handle, and the controller is used to control the servo motor according to the lateral pressure F. When F < F0 - δ, control the servo motor to drive the drive handle, so that the horizontal push rod (50) moves forward until F = F0; δ is the preset error value.

3. The fatigue testing method under lateral force loading conditions according to claim 2, characterized in that, A speed reducer is also provided between the drive handle and the servo motor to reduce the output speed.

4. Fatigue testing method under lateral force loading conditions, based on A fatigue testing system with lateral stress load, characterized in that it comprises: S1. Connect the test piece (10) between the upper fixed base (12) and the lower fixed base (11); S2. Drive the horizontal push rod (50) to abut against the middle of the test piece (10) by the dual guide rod drive assembly (40); S3. Obtain the reading F1 of the first pressure sensor (40a) and the readings F2 and F3 of the two second pressure sensors, and calculate the lateral pressure F applied by the horizontal push rod (50) to the test piece (10), F = F1 - F2 - F3; S4. Drive the dual guide rod drive assembly (40) to make the lateral pressure F reach the preset value F0; S5. Drive the upper fixed seat (12) to perform fatigue testing on the test piece (10); S6. When the test piece (10) experiences fatigue fracture, record the fatigue test data to complete the fatigue test.

5. The fatigue testing method under lateral force loading conditions according to any one of claims 1-4, characterized in that, The fatigue testing system with lateral stress load includes a lower fixed seat (11), an upper fixed seat (12), and a horizontal push rod (50). The lower fixed seat (11) is connected to the base of the testing machine, and the upper fixed seat (12) is connected to the power output end of the testing machine. The upper fixed seat (12) and the lower fixed seat (11) clamp the upper and lower ends of the test piece (10). The horizontal push rod (50) is horizontally arranged between the upper fixed seat (12) and the lower fixed seat (11) and can move in the horizontal direction and contact the middle of the test piece (10) to apply a horizontal thrust to the test piece (10) and obtain the magnitude of the thrust through a pressure sensor.

6. The fatigue testing method under lateral force loading conditions according to claim 5, characterized in that, The fatigue testing system also includes: The system comprises a saddle seat (20), a fixed guide frame (30), a dual guide rod drive assembly (40), and a thrust measurement module. The saddle seat (20) is fitted onto the lower fixed seat (11), and the side of the saddle seat (20) is a vertical fixed surface for fixed connection with the fixed guide frame (30). The fixed guide frame (30) is a horizontally arranged square frame structure, and the height of the main body of the fixed guide frame (30) corresponds to the position between the upper fixed seat (12) and the lower fixed seat (11). The dual guide rod drive assembly (40) is connected to the fixed guide frame (30) and is used to drive the horizontal push rod (50) to move in the horizontal direction. The thrust measurement module is used to indirectly measure the stress between the horizontal push rod (50) and the test piece (10).

7. The fatigue testing method under lateral force loading conditions according to claim 5, characterized in that, The saddle seat (20) includes a U-shaped seat (21) and a fixed side plate (22). The groove diameter of the U-shaped seat (21) is adapted to the column diameter of the lower fixed seat (11). The side fixed plate (22) is connected to the side of the U-shaped seat (21) to fix the U-shaped seat (21) to the column of the lower fixed seat (11).

8. The fatigue testing method under lateral force loading conditions according to claim 5, characterized in that, The fixed guide frame (30) includes a fixed support plate (31), two guide optical axes (32) and a guide support plate (33). The two guide optical axes (32) are arranged in parallel vertically. The guide support plate (33) is fixedly connected to the fixed support plate (31) through the two guide optical axes (32) to form a rectangular frame structure. Both guide optical axes (32) point to the test piece (10). The height position of the fixed support plate (31) relative to the side fixed plate (22) is adjustable, so that the contact position between the horizontal push rod (50) driven by the dual guide rod drive assembly (40) and the test piece (10) is adjustable, thereby obtaining fatigue test data of lateral stress load at different contact positions of the test piece (10).

9. The fatigue testing method under lateral force loading conditions according to claim 5, characterized in that, The dual-guide rod drive assembly (40) includes a threaded drive rod (41), a vertical drive plate (42), a horizontal push plate (43), a balance spring (44), and two sliding guide rods (45). The threaded drive rod (41) is threadedly connected to the symmetrical axis of the two guide optical axes (32) on the guide support plate (33). The vertical drive plate (42) is vertically arranged and slidably connected to the upper and lower guide optical axes (32). The front end of the threaded drive rod (41) abuts against the middle position of the vertical drive plate (42). The two sliding guide rods (45) are horizontally arranged and symmetrical about the two sides of the center plane of the two guide optical axes (32). The rear end of the sliding guide rod (45) is fixedly connected to the horizontal push plate (43). The two sliding guide rods (45) slidably pass through the sliding shaft hole on the fixed support plate (31). Each balance spring (44) is correspondingly sleeved. On the sliding guide rod (45), and located between the fixed support plate (31) and the horizontal push plate (43); the vertical drive plate (42) abuts against the horizontal push plate (43) through the first pressure sensor (40a), and each of the balance springs (44) is connected to the horizontal push plate (43) or the fixed support plate (31) through a second pressure sensor; the front ends of the two sliding guide rods (45) are connected to the horizontal push rod (50); the thrust measurement module is composed of the first pressure sensor (40a) and the two second pressure sensors, and the thrust measurement module calculates the pressure difference between the pressure F1 obtained by the first pressure sensor (40a) and the pressures F2 and F3 obtained by the two second pressure sensors: F1-F2-F3 to obtain the stress between the horizontal push rod (50) and the test piece (10); The two guide optical axes (32), the two sliding guide rods (45) and the threaded drive rod (41) form a cross-shaped symmetrical structure in space, that is, the threaded drive rod (41) is located at the center of the two guide optical axes (32) in the vertical direction and at the center of the two sliding guide rods (45) in the horizontal direction. The threaded drive rod (41) has a drive handle (46) at its rear end. The drive handle (46) is connected to a servo drive motor. The servo drive motor is used to control the drive handle (46) to rotate according to the pressure difference F1-F2-F3 obtained by the thrust measurement module, so as to make the threaded drive rod (41) move forward or backward.

10. The fatigue testing method under lateral force loading conditions according to claim 5, characterized in that, The front end of the threaded drive rod (41) is connected to the vertical drive plate (42) via a rotating bearing; The front end of the sliding guide rod (45) is connected to the test piece (10) via an adapter; The adapter includes a first mating block (47) and a second mating block (48). The two mating blocks form a circular hole after mating, which is connected to the horizontal push rod (50). The rear end of the first mating block (47) is fixedly connected to the front end of the sliding rod (45).

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