A fretting fatigue test apparatus and method

Abstract

The application discloses a kind of fretting fatigue test equipment and method, belong to fatigue test device technical field.A kind of fretting fatigue test equipment, comprising: operating platform, installation support being arranged on operating platform and test mechanism being arranged on installation support;Test mechanism includes the case being arranged on installation support, with the driving shaft of case sliding cooperation and towards operating platform and the drive assembly being arranged on case, intermediate connecting component, torsion mechanism and tension-compression mechanism;Intermediate connecting component is connected with drive assembly, intermediate connecting component is connected with torsion mechanism and / or tension-compression mechanism, and torsion mechanism and tension-compression mechanism are all connected with driving shaft.The application can carry out a variety of fretting fatigue test, when needing to carry out a variety of fretting fatigue test, not only reduce the use number of test equipment, reduce equipment cost, but also can carry out composite fretting fatigue test, improve practicality.

Description

Technical Field

[0001] This invention relates to the field of fatigue testing equipment technology, specifically to a fretting fatigue testing device and method. Background Technology

[0002] Fatigue testing machines are core testing equipment used in the industrial field to evaluate the fatigue resistance of materials, components, and structural parts. Their working principle is to continuously apply cyclic loads such as alternating stress, strain, or displacement to the specimen during actual service by simulating the alternating stress, strain, or displacement that the specimen may experience. Ultimately, key performance parameters such as fatigue life, fatigue limit, and fatigue strength of the specimen are obtained. This provides indispensable test data support for product structural design optimization, material selection verification, production quality control, and failure cause analysis. It is an important technical means to ensure the durability and safety of industrial products.

[0003] Existing fatigue testing machines are difficult to adapt to the testing needs of diverse specimens. Most existing fatigue testing machines adopt a fixed load output structure, which can only realize a single type of fatigue action. For example, some equipment can only complete uniaxial tensile or compressive cycle fatigue tests. Different fatigue testing machines are needed to perform fatigue tests for various fatigue tests. In addition, the output stroke of existing fatigue testing machines is relatively fixed, which makes it inconvenient to adjust the micro-motion stroke (such as torsional stroke or tensile-compression stroke) during the test. Summary of the Invention

[0004] The purpose of this invention is to provide a fretting fatigue testing device and method to solve the problem that existing fatigue testing machines are not suitable for fatigue testing under fretting conditions.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A fretting fatigue testing device includes: an operating table, a mounting bracket disposed on the operating table, and a testing mechanism disposed on the mounting bracket; the testing mechanism includes a chassis disposed on the mounting bracket, a drive shaft slidably fitted with the chassis and facing the operating table, and a drive assembly, an intermediate connecting assembly, a torsion mechanism, and a tension / compression mechanism disposed on the chassis; the intermediate connecting assembly is connected to the drive assembly, and the intermediate connecting assembly is connected to the torsion mechanism and / or the tension / compression mechanism, and both the torsion mechanism and the tension / compression mechanism are connected to the drive shaft; When the intermediate connecting component is connected to the torsion mechanism, the torsion mechanism drives the drive shaft to perform forward and reverse reciprocating torsion for torsion fretting fatigue testing. When the intermediate connecting component is connected to the tension and compression mechanism, the tension and compression mechanism drives the drive shaft to perform reciprocating linear motion in the vertical direction for tension and compression fretting fatigue testing or bending fretting fatigue testing. When the intermediate connecting component is connected to both the torsion mechanism and the tension and compression mechanism, a combined fretting fatigue test is performed.

[0006] Furthermore, the aforementioned drive assembly includes a drive motor mounted on the chassis, a drive wheel connected to the drive motor, an adjustment assembly mounted on the drive wheel, a connecting rod rotatably connected to the adjustment assembly, a rack connected to the connecting rod, a first gear meshing with the rack, a belt transmission assembly connected to the first gear, and the belt transmission assembly being connected to the intermediate connection assembly. The drive wheel is provided with a strip groove. The adjustment component includes a slider that slides in the strip groove and a screw that rotates in the slider. The slider is rotatably connected to the connecting rod, and the screw is threaded in the drive wheel. When the screw rotates, it drives the slider to slide in the strip groove, thereby adjusting the travel of the rack and thus adjusting the rotation angle of the intermediate connecting component.

[0007] Furthermore, the aforementioned chassis is equipped with a guide rod that slides with the rack, and the side wall of the chassis is provided with a strip-shaped hole for the connecting rod to pass through.

[0008] Furthermore, the aforementioned intermediate connecting component includes a vertically arranged intermediate shaft and clutch components respectively arranged at both ends of the intermediate shaft. The clutch components cooperate with the torsion mechanism and the tension / compression mechanism respectively to realize the connection between the intermediate connecting component and the torsion mechanism and / or the tension / compression mechanism.

[0009] Furthermore, the aforementioned clutch assembly includes a first toothed wheel mounted on an intermediate shaft, a second toothed wheel cooperating with the first toothed wheel, a sliding sleeve connected to the second toothed wheel, a spring mounted inside the sliding sleeve, and a shifting rod that rotatably engages with the sliding sleeve. The chassis has interconnected vertical and horizontal holes. The shift rod slides in the vertical and horizontal holes. When the shift rod is in the vertical hole, the spring rebounds under the action of elastic force. When the shift rod is in the horizontal hole, the spring remains in a compressed state.

[0010] Furthermore, the aforementioned torsion mechanism includes a torsion drive shaft vertically disposed within the housing, a second gear sleeved on the torsion drive shaft, and a third gear sleeved on the drive shaft and meshing with the second gear; the torsion drive shaft extends into the corresponding sliding sleeve and contacts the corresponding spring.

[0011] Furthermore, the aforementioned tensioning mechanism includes a tensioning drive shaft vertically disposed within the housing, a drive roller disposed on the tensioning drive shaft, and a lever disposed on the drive shaft; the tensioning drive shaft extends into the corresponding sliding sleeve and contacts the corresponding spring; the drive roller is provided with a spiral groove, and the lever extends into the spiral groove and slides within the spiral groove.

[0012] Furthermore, the aforementioned torsion drive shaft and tension / compression drive shaft are each equipped with a shaft locking device.

[0013] A fretting fatigue testing method based on the above-mentioned fretting fatigue testing equipment includes the following steps: S1: Place the workpiece on the operating table and connect the workpiece to the drive shaft; S2: Adjust the rotational speed of the intermediate connecting component through the drive component; S3: Connect the intermediate connecting component to the torsion mechanism, which drives the drive shaft to perform forward and reverse reciprocating torsion for torsion fretting fatigue testing; or connect the intermediate connecting component to the tension and compression mechanism, which drives the drive shaft to perform reciprocating linear motion in the vertical direction for tension and compression fretting fatigue testing or bending fretting fatigue testing; or connect the intermediate connecting component to both the torsion mechanism and the tension and compression mechanism for combined fretting fatigue testing.

[0014] Furthermore, in step S2 above, the screw is adjusted so that the slider slides in the groove, thereby adjusting the rotational speed of the intermediate connecting component; In step S3, the shifting rod is moved from the horizontal hole into the vertical hole. Under the action of the spring, the first toothed wheel and the second toothed wheel cooperate, so that the intermediate connecting assembly is connected to the torsion mechanism and / or the tension and compression mechanism.

[0015] The present invention has the following beneficial effects: (1) The drive component in the fretting fatigue testing equipment of the present invention can be connected to the torsion mechanism and the tension and compression mechanism separately through the intermediate connecting component, or it can be connected together with the torsion mechanism and the tension and compression mechanism through the intermediate connecting component. Thus, not only can torsion fretting fatigue test, tension and compression fretting fatigue test, and bending fretting fatigue test be performed, but also composite fretting fatigue test can be performed. The present invention integrates multiple fretting fatigue conditions in the same equipment, and multiple fretting fatigue tests can be performed through the same equipment or even the same drive mechanism. When multiple fretting fatigue tests are required, not only is the number of test equipment used reduced and the equipment cost reduced, but also composite fretting fatigue test can be performed, thus improving practicality.

[0016] (2) The present invention provides an adjustment component on the drive wheel of the drive assembly. The stroke of the connecting rod can be adjusted by adjusting the adjustment component, thereby adjusting the reciprocating stroke of the rack, and then adjusting the torsional or tensile stroke. It is particularly suitable for fretting fatigue test to obtain fatigue data under different fretting stroke conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the fretting fatigue testing equipment provided by the present invention; Figure 2 A schematic diagram of the external structure of the testing mechanism provided by the present invention; Figure 3 This is a schematic diagram of the structure of the adjustment mechanism provided by the present invention; Figure 4 A schematic diagram of the internal structure of the testing mechanism provided by the present invention; Figure 5 A schematic diagram of the structure of the intermediate connection component provided by the present invention; Figure 6 A schematic diagram of the torsion mechanism provided by the present invention; Figure 7 This is a schematic diagram of the tension / compression mechanism provided by the present invention; Figure 8 This is a schematic diagram of the clutch assembly provided by the present invention; Figure 9 This is a schematic diagram showing the position between the transposition rod and the housing provided by the present invention.

[0018] In the diagram: 10-Operating table; 20-Mounting bracket; 30-Testing mechanism; 31-Chassis; 32-Drive shaft; 33-Drive assembly; 34-Intermediate connecting assembly; 35-Torsion mechanism; 36-Tension mechanism; 311-Guide rod; 312-Strip hole; 313-Vertical hole; 314-Horizontal hole; 331-Drive motor; 332-Drive wheel; 333-Adjusting assembly; 334-Connecting rod; 335-Rack; 336-First gear; 337-Plate With transmission assembly; 341-intermediate shaft; 342-clutch assembly; 351-torsional drive shaft; 352-second gear; 353-third gear; 361-tension / compression drive shaft; 362-drive roller; 363-actuator; 364-spiral groove; 3321-strip groove; 3331-slider; 3332-screw; 3421-first toothed clutch; 3422-second toothed clutch; 3423-sliding sleeve; 3424-spring; 3425-shifting rod. Detailed Implementation

[0019] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] like Figure 1 As shown, this embodiment provides a fretting fatigue testing device, including: an operating table 10, a mounting bracket 20 disposed on the operating table 10, and a testing mechanism 30 disposed on the mounting bracket 20. The testing mechanism 30 includes a housing 31 mounted on the mounting bracket 20, a drive shaft 32 slidably engaged with the housing 31, and a drive assembly 33, an intermediate connecting assembly 34, and a torsion mechanism 35 disposed on the housing 31. The drive shaft 32 is vertically arranged and connected to all components. The intermediate connecting assembly 34 is connected to the drive assembly 33 and is also connected to the torsion mechanism 35 and / or the tension / compression mechanism 36.

[0021] The operating table 10 is used to place the specimen, and the drive shaft 32 is used to connect the specimen. When the intermediate connecting assembly 34 is connected to the torsion mechanism 35, the torsion mechanism 35 drives the drive shaft 32 to perform forward and reverse reciprocating torsion for torsion fretting fatigue testing. When the intermediate connecting assembly 34 is connected to the tension and compression mechanism 36, the tension and compression mechanism 36 drives the drive shaft 32 to perform reciprocating linear motion in the vertical direction for tension and compression fretting fatigue testing or bending fretting fatigue testing. When the intermediate connecting assembly 34 is connected to both the torsion mechanism 35 and the tension and compression mechanism 36, a combined fretting fatigue test is performed.

[0022] like Figures 2 to 4 As shown, the drive assembly 33 includes a drive motor 331, a drive wheel 332, an adjustment assembly 333, a connecting rod 334, a rack 335, a first gear 336, and a belt transmission assembly 337. The drive motor 331 is fixedly installed on the outside of the housing 31. The drive wheel 332 is connected to the motor shaft of the drive motor 331. The drive wheel 332 is provided with a strip groove 3321. The extension direction of the strip groove 3321 is towards the rotation center of the drive wheel 332. An adjustment component 333 is provided in the strip groove 3321. The adjustment component 333 is rotatably connected to one end of the connecting rod 334. The other end of the connecting rod 334 is rotatably connected to a rack 335. The housing 31 is provided with a guide rod 311. The rack 335 is slidably engaged with the guide rod 311. When the drive motor 331 is working, it will drive the rack 335 to reciprocate along the guide rod 311 through the adjustment component 333 and the connecting rod 334. The adjustment component 333 can also adjust the travel of the rack 335 along the guide rod 311. The first gear 336 is rotatably mounted inside the housing 31. The pulley at one end of the belt transmission assembly 337 is coaxially connected to the first gear 336, and the pulley at the other end of the belt transmission assembly 337 is connected to the intermediate connecting assembly 34.

[0023] In order to facilitate the movement of the connecting rod 334, in this embodiment, the side wall of the housing 31 is provided with a strip hole 312 for the connecting rod 334 to pass through.

[0024] The adjusting assembly 333 includes a slider 3331 and a screw 3332. The slider 3331 is rotatably engaged with the connecting rod 334 and can slide in the strip groove 3321. The screw 3332 is positioned towards the rotation center of the drive wheel 332. The screw 3332 is threadedly engaged with the edge of the drive wheel 332. The tail of the screw 3332 is rotatably engaged with the slider 3331. Tightening the screw 3332 can adjust the position of the slider 3331 in the strip groove 3321, thereby adjusting the travel of the rack 335 along the guide rod 311, and thus adjusting the forward and reverse rotation of the belt in the belt transmission assembly 337.

[0025] To ensure the fixed position of the screw 3332, in this embodiment, the screw 3332 is connected to a shaft locking device.

[0026] like Figure 5 As shown, the intermediate connecting assembly 34 includes an intermediate shaft 341 and clutch assemblies 342 respectively disposed at both ends of the intermediate shaft 341. The two clutch assemblies 342 cooperate with the torsion mechanism 35 and the tension and compression mechanism 36 respectively. The pulley at the other end of the belt transmission assembly 337 is fixedly sleeved on the intermediate shaft 341.

[0027] like Figure 6 As shown, the torsion mechanism 35 is vertically and rotatably mounted in the housing 31, with a torsion drive shaft 351, a second gear 352 mounted on the torsion drive shaft 351, and a third gear 353 mounted on the drive shaft 32 and meshing with the second gear 352.

[0028] like Figure 7 As shown, the tension / compression mechanism 36 includes a tension / compression drive shaft 361 that is vertically and rotatably mounted inside the housing 31, a drive roller 362 mounted on the tension / compression drive shaft 361, and a lever 363 mounted on the drive shaft 32. The drive roller 362 is provided with a spiral groove 364, and the lever 363 extends into the spiral groove 364 and slides in cooperation with the spiral groove 364.

[0029] like Figures 5 to 9 As shown, the clutch assembly 342 includes a first toothed wheel 3421 mounted on an intermediate shaft 341, a second toothed wheel 3422 cooperating with the first toothed wheel 3421, a sliding sleeve 3423 connected to the second toothed wheel 3422, a spring 3424 disposed within the sliding sleeve 3423, and a shifting rod 3425 rotatably cooperating with the sliding sleeve 3423. In the clutch assembly 342 connected to the torsion mechanism 35, the tension-pressure drive shaft 361 extends into the sliding sleeve 3423 and is connected to the spring 3424. In the clutch assembly 342 connected to the tension-pressure mechanism 36, the tension-pressure drive shaft 361 extends into the sliding sleeve 3423 and is connected to the spring 3424.

[0030] The chassis 31 is provided with a vertical hole 313 and a horizontal hole 314 that are interconnected. The shift rod 3425 is slidably engaged with the vertical hole 313 and the horizontal hole 314. The position and shape of the vertical hole 313 and the horizontal hole 314 meet the following requirements: when the shift rod 3425 is located in the vertical hole 313, the spring 3424 rebounds under the action of elastic force, so that the first toothed wheel 3421 and the second toothed wheel 3422 are engaged. When the shift rod 3425 is located in the horizontal hole 314, the spring 3424 is kept in a compressed state.

[0031] In order to ensure that the shift rod 3425 can be fixed in the transverse hole 314, in this embodiment, a groove is provided in the transverse hole 314 to limit the shift rod 3425.

[0032] To ensure the fixed positions of the torsion drive shaft 351 and the tension / compression drive shaft 361, in this embodiment, the torsion drive shaft 351 and the tension / compression drive shaft 361 are respectively connected to shaft locking devices.

[0033] In this embodiment, the drive component 33 of the fretting fatigue testing equipment can be connected to the torsion mechanism 35 or the tension / compression mechanism 36 separately through the intermediate connecting component 34, or it can be connected together with the torsion mechanism 35 and the tension / compression mechanism 36 through the intermediate connecting component 34. Thus, it can not only perform torsional fretting fatigue tests, tension / compression fretting fatigue tests, and bending fretting fatigue tests, but also perform composite fretting fatigue tests. When multiple fretting fatigue tests are required, it not only reduces the number of testing equipment used and lowers the equipment cost, but also enables composite fretting fatigue tests, thus improving practicality.

[0034] This embodiment also provides a fretting fatigue testing method based on the above-mentioned fretting fatigue testing equipment, including the following steps: S1: Place the workpiece on the operating table 10 and connect the workpiece to the drive shaft 32; S2: Adjust the screw 3332 to make the slider 3331 slide in the slot 3321, fix the slider 3331 to the set position, thereby adjusting the reciprocating stroke of the intermediate shaft 341, and then adjusting the torsional stroke of the drive shaft 32 and / or adjusting the reciprocating stroke of the drive shaft 32 in the vertical direction. S3: Conduct fretting fatigue testing, including: (1) Pull the shift rod 3425 to connect the intermediate connecting component 34 with the torsion mechanism 35 and separate the intermediate connecting component 34 from the tension and compression mechanism 36. The torsion mechanism 35 drives the drive shaft 32 to perform forward and reverse reciprocating torsion for torsion fretting fatigue test. (2) Pull the shift rod 3425 to separate the intermediate connecting component 34 from the torsion mechanism 35 and connect the intermediate connecting component 34 to the tension and compression mechanism 36. The tension and compression mechanism 36 drives the drive shaft 32 to perform reciprocating linear motion in the vertical direction for tension and compression fretting fatigue test or bending fretting fatigue test. (3) Pull the shift rod 3425 to connect the intermediate connecting component 34 with the torsion mechanism 35 and connect the intermediate connecting component 34 with the tension and compression mechanism 36. The torsion mechanism 35 drives the drive shaft 32 to perform forward and reverse reciprocating torsion, while the tension and compression mechanism 36 drives the drive shaft 32 to perform reciprocating linear motion in the vertical direction, thereby conducting a composite fretting fatigue test. During the connection or separation process of the intermediate connecting assembly 34 with the torsion mechanism 35 and the tension / compression mechanism 36, the shifting rod 3425 enters the vertical hole 313 from the horizontal hole 314, and the first toothed wheel 3421 and the second toothed wheel 3422 cooperate under the action of the spring 3424, so that the intermediate connecting assembly 34 is connected with the torsion mechanism 35 and / or the tension / compression mechanism 36; the shifting rod 3425 enters the horizontal hole 314 from the vertical hole 313, and the first toothed wheel 3421 and the second toothed wheel 3422 separate under the action of the spring 3424, so that the intermediate connecting assembly 34 is separated from the torsion mechanism 35 and / or the tension / compression mechanism 36.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fretting fatigue testing device, characterized in that, include: The test mechanism (30) includes a control panel (10), a mounting bracket (20) mounted on the control panel (10), and a test mechanism (30) mounted on the mounting bracket (20). The test mechanism (30) includes a chassis (31) mounted on the mounting bracket (20), a drive shaft (32) slidably fitted with the chassis (31) and facing the control panel (10), and a drive assembly (33), an intermediate connection assembly (34), a torsion mechanism (35), and a tension / compression mechanism (36) mounted on the chassis (31). The intermediate connection assembly (34) is connected to the drive assembly (33), and the intermediate connection assembly (34) is connected to the torsion mechanism (35) and / or the tension / compression mechanism (36). Both the torsion mechanism (35) and the tension / compression mechanism (36) are connected to the drive shaft (32). When the intermediate connecting component (34) is connected to the torsion mechanism (35), the torsion mechanism (35) drives the drive shaft (32) to perform forward and reverse reciprocating torsion for torsion fretting fatigue test. When the intermediate connecting component (34) is connected to the tension and compression mechanism (36), the tension and compression mechanism (36) drives the drive shaft (32) to perform reciprocating linear motion in the vertical direction for tension and compression fretting fatigue test or bending fretting fatigue test. When the intermediate connecting component (34) is connected to both the torsion mechanism (35) and the tension and compression mechanism (36), a composite fretting fatigue test is performed.

2. The fretting fatigue testing equipment according to claim 1, characterized in that, The drive assembly (33) includes a drive motor (331) mounted on the chassis (31), a drive wheel (332) connected to the drive motor (331), an adjustment assembly (333) mounted on the drive wheel (332), a connecting rod (334) rotatably connected to the adjustment assembly (333), a rack (335) connected to the connecting rod (334), a first gear (336) meshing with the rack (335), and a belt transmission assembly (337) connected to the first gear (336). The belt transmission assembly (337) is connected to the intermediate connection assembly (34). The drive wheel (332) is provided with a strip groove (3321). The adjustment component (333) includes a slider (3331) that slides with the strip groove (3321) and a screw (3332) that rotates with the slider (3331). The slider (3331) is rotatably connected to the connecting rod (334). The screw (3332) is threadedly connected to the drive wheel (332). When the screw (3332) rotates, it drives the slider (3331) to slide in the strip groove (3321), thereby adjusting the travel of the rack (335) and thus adjusting the rotation angle of the intermediate connecting component (34).

3. The fretting fatigue testing equipment according to claim 2, characterized in that, The housing (31) is provided with a guide rod (311) that slides with the rack (335), and the side wall of the housing (31) is provided with a strip hole (312) for the connecting rod (334) to pass through.

4. The fretting fatigue testing equipment according to any one of claims 1 to 3, characterized in that, The intermediate connecting assembly (34) includes a vertically arranged intermediate shaft (341) and clutch assemblies (342) respectively arranged at both ends of the intermediate shaft (341). The clutch assemblies (342) cooperate with the torsion mechanism (35) and the tension / compression mechanism (36) respectively to realize the connection between the intermediate connecting assembly (34) and the torsion mechanism (35) and / or the tension / compression mechanism (36).

5. The fretting fatigue testing equipment according to claim 4, characterized in that, The clutch assembly (342) includes a first toothed wheel (3421) disposed on the intermediate shaft (341), a second toothed wheel (3422) cooperating with the first toothed wheel (3421), a sliding sleeve (3423) connected to the second toothed wheel (3422), a spring (3424) disposed in the sliding sleeve (3423), and a shifting rod (3425) rotatably cooperating with the sliding sleeve (3423). The chassis (31) is provided with a vertical hole (313) and a horizontal hole (314) that are interconnected. The shift rod (3425) is slidably engaged with the vertical hole (313) and the horizontal hole (314). When the shift rod (3425) is located in the vertical hole (313), the spring (3424) rebounds under the action of elastic force. When the shift rod (3425) is located in the horizontal hole (314), the spring (3424) remains in a compressed state.

6. The fretting fatigue testing equipment according to claim 5, characterized in that, The torsion mechanism (35) includes a torsion drive shaft (351) vertically disposed in the housing (31), a second gear (352) sleeved on the torsion drive shaft (351), and a third gear (353) sleeved on the drive shaft (32) and meshing with the second gear (352); the torsion drive shaft (351) extends into the corresponding sliding sleeve (3423) and contacts the corresponding spring (3424).

7. The fretting fatigue testing equipment according to claim 6, characterized in that, The tension / compression mechanism (36) includes a tension / compression drive shaft (361) vertically arranged in the housing (31), a drive roller (362) arranged on the tension / compression drive shaft (361), and a lever (363) arranged on the drive shaft (32); the tension / compression drive shaft (361) extends into the corresponding sliding sleeve (3423) and contacts the corresponding spring (3424); the drive roller (362) is provided with a spiral groove (364), and the lever (363) extends into the spiral groove (364) and slides in cooperation with the spiral groove (364).

8. The fretting fatigue testing equipment according to claim 7, characterized in that, The torsion drive shaft (351) and the tension drive shaft (361) are respectively provided with shaft locking devices.

9. A fretting fatigue testing method based on the fretting fatigue testing equipment according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1: Place the workpiece on the operating table (10) and connect the workpiece to the drive shaft (32); S2: Adjust the rotational speed of the intermediate connecting component (34) by driving component (33); S3: Connect the intermediate connecting component (34) to the torsion mechanism (35), and the torsion mechanism (35) drives the drive shaft (32) to perform forward and reverse reciprocating torsion for torsion fretting fatigue test; or connect the intermediate connecting component (34) to the tension and compression mechanism (36), and the tension and compression mechanism (36) drives the drive shaft (32) to perform reciprocating linear motion in the vertical direction for tension and compression fretting fatigue test or bending fretting fatigue test; or connect the intermediate connecting component (34) to both the torsion mechanism (35) and the tension and compression mechanism (36) for compound fretting fatigue test.

10. The fretting fatigue test method according to claim 9, characterized in that... In step S2, the screw (3332) is adjusted so that the slider (3331) slides in the strip groove (3321) to adjust the rotation speed of the intermediate connecting component (34); In step S3, the shifting rod (3425) is moved from the horizontal hole (314) into the vertical hole (313). Under the action of the spring (3424), the first toothed wheel (3421) and the second toothed wheel (3422) cooperate, so that the intermediate connecting assembly (34) is connected to the torsion mechanism (35) and / or the tension and compression mechanism (36).

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