Fretting fatigue testing device and testing machine with same

Abstract

The invention discloses a fretting fatigue test device and a testing machine with the fretting fatigue test device, the fretting fatigue test device comprises a test bed, a load mechanism and an excitation mechanism, the test bed is suitable for being mounted on the testing machine, and the testing machine is provided with a test piece and comprises a hydraulic clamp for providing a load in a first direction for the test piece; the loading mechanism is arranged on the test bench and used for providing a load in a second direction for the test piece, and the excitation mechanism is arranged on the test bench and used for providing vibration excitation in a third direction for the test piece. According to the fretting fatigue test device disclosed by the embodiment of the invention, the test bed is mounted on the test machine, the integration of the test machine and the fretting fatigue test device is realized, so that the fretting fatigue test can be conveniently carried out on the test machine, and three-way loading on the test piece during the fretting fatigue test is realized through the cooperation of the hydraulic clamp, the loading mechanism and the excitation mechanism; a complex fretting fatigue condition of a test piece in use is accurately simulated, and the accuracy of a fretting fatigue test is improved, so that the working performance of the fretting fatigue test device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fretting fatigue testing, and in particular to a fretting fatigue testing device and a testing machine having the same. Background Art

[0002] Micromotion refers to the extremely small reciprocating motion that occurs between surfaces in contact with each other. It usually exists between mechanical parts that are nearly "stationary" (such as tightly fitting parts in the fields of automobiles, railways, ships, aerospace, etc.). The displacement amplitude is generally in the micron range, and studies have shown that micromotion fatigue has a huge impact on the material of parts, and its fatigue strength can be reduced by 2 to 5 times.

[0003] In the prior art, in order to study the fretting fatigue characteristics of part materials, fretting fatigue tests are usually carried out in laboratories. However, the prior fretting fatigue tests usually add a constant load in the normal direction of the testing machine to perform a bidirectional loading simulation test. This simulation test cannot accurately simulate the fretting fatigue of the specimen, thereby reducing the accuracy of the fretting damage test. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a micro-motion fatigue test device, which can load a specimen in three directions to simulate the complex micro-motion fatigue condition of the specimen when in use, improve the accuracy of the micro-motion fatigue test, and solve the technical problem of poor accuracy of micro-motion fatigue test in the prior art.

[0005] The present invention also aims to provide a testing machine having the above-mentioned micro-motion fatigue testing device.

[0006] A micro-motion fatigue testing device according to an embodiment of the present invention includes: a test bench, which is suitable for being installed on a testing machine, on which a test piece to be tested is provided, and the testing machine includes a hydraulic clamp, which is used to provide a load in a first direction for the test piece; a load mechanism, which is arranged on the test bench, and is used to provide a load in a second direction for the test piece; and an excitation mechanism, which is arranged on the test bench, and is used to provide vibration excitation in a third direction for the test piece, and the third direction and the second direction intersect with the first direction in pairs.

[0007] According to the micro-motion fatigue test device of the embodiment of the present invention, the test bench is installed on the testing machine to realize the integration of the testing machine and the micro-motion fatigue test device, so as to realize the micro-motion fatigue test on the testing machine. At the same time, because the testing machine includes a hydraulic clamp for providing a load in a first direction to the specimen, the micro-motion fatigue test device includes a load mechanism for providing a load in a second direction to the specimen and an excitation mechanism for providing vibration excitation in a third direction to the specimen, so as to realize three-way loading of the specimen when carrying out the micro-motion fatigue test, thereby simulating the complex micro-motion fatigue condition of the specimen when in use, improving the accuracy of the micro-motion fatigue test, and ensuring the working performance of the micro-motion fatigue test device.

[0008] In some embodiments, the fretting fatigue testing device further includes a positioning mechanism, and the positioning mechanism is used to position the test piece.

[0009] In some embodiments, the test bench is provided with a mounting groove running through it, and at least part of the test piece and the load mechanism are arranged in the mounting groove; the positioning mechanism is arranged on the load mechanism.

[0010] In some embodiments, the load mechanism includes a first driving member and multiple moving members, at least two of the moving members are arranged at opposite sides of the specimen along the second direction, and the first driving member is cooperatively connected to one of the moving members to drive the moving member to move along the second direction.

[0011] In some embodiments, the load mechanism includes a load sensor and a controller, wherein the load sensor is connected between the first driving member and one of the moving members, and is used to detect the load applied by the first driving member; the controller is electrically connected to the load sensor and the first driving member, respectively, and is used to receive the detection result of the load sensor, and the controller is also used to control the output load of the first driving member.

[0012] In some embodiments, the movable member includes a guide seat and a support seat, the guide seat is movably matched with the groove wall of the mounting groove, the support seat is arranged on the guide seat, and the first driving member is matched and connected with one of the support seats to use the support seat to clamp the specimen.

[0013] In some embodiments, the positioning mechanism includes a positioning pad and a plurality of micro-motion pads, the positioning pad is movably disposed on the support seat along the second direction, the positioning pad is provided with a positioning groove running through it, at least part of the micro-motion pad and at least part of the specimen are disposed in the positioning groove, and the positioning pad is used to position the micro-motion pad and the specimen; wherein at least two of the micro-motion pads are spaced apart on opposite sides of the specimen along the second direction and fixedly connected to the support seat, the support seat is used to drive the micro-motion pads to move so as to clamp the specimen using the micro-motion pads; the support seat is disposed on the guide seat through a plurality of screw members so that the position of the support seat in the first direction is adjustable.

[0014] In some embodiments, the positioning mechanism also includes a positioning clamp, and in the first direction, one end of the micro-motion pad stops at the support seat, and the other end of the micro-motion pad protrudes from the positioning groove, and the positioning clamp is arranged on the side of the micro-motion pad away from the support seat, and the positioning clamp is fixedly connected to the support seat to fix the micro-motion pad.

[0015] In some embodiments, the test bench includes a first support member and a second support member, the first support member is arranged on the radial inner side of the second support member, the first support member is provided with the mounting groove, the excitation mechanism includes a second driving member, the second driving member is arranged on the second support member and is arranged opposite to the test piece along the third direction, and the output shaft of the second driving member is connected to the test piece.

[0016] According to an embodiment of the present invention, the testing machine includes: a column; a micro-motion fatigue test device, which is the micro-motion fatigue test device mentioned above, and the test bench is cooperatively connected to the column; a plurality of hydraulic clamps, which are respectively connected to the opposite ends of the specimen in the first direction; wherein one of the plurality of hydraulic clamps is rotatably connected to the specimen, so that the excitation mechanism can provide vibration excitation in the third direction for the specimen.

[0017] According to the testing machine of the embodiment of the present invention, by adopting the aforementioned micro-motion fatigue testing device, three-way loading of the test piece can be realized during the micro-motion fatigue test, so as to simulate the complex micro-motion fatigue condition of the test piece during use, improve the accuracy of the micro-motion fatigue test, and ensure the working performance of the testing machine.

[0018] Additional aspects and advantages of the invention will become apparent from the following description, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 Schematic diagram of partial structure of a testing machine according to some embodiments of the present invention.

[0021] Figure 2 for Figure 1 The main view of the testing machine after some structures are omitted.

[0022] Figure 3 Schematic diagram of the cooperation of the load mechanism, the excitation mechanism and the hydraulic clamp in some embodiments of the present invention.

[0023] Figure 4 for Figure 3 A magnified view of the structure in the middle.

[0024] Figure 5 for Figure 3 Schematic diagram after omitting some structures.

[0025] Reference numerals:

[0026] 1000. Testing machine;

[0027] 100. Fretting fatigue test device;

[0028] 110. Test bench;

[0029] 111, mounting slot;

[0030] 112. A first support member;

[0031] 113, second support member; 1131, first support plate; 1132, second support plate;

[0032] 114, support block;

[0033] 115. Install components;

[0034] 1151, first mounting member; 1152, second mounting member; 1153, second fastening member;

[0035] 116. A first fastener;

[0036] 120. Load mechanism;

[0037] 121. A first driving member;

[0038] 122, moving part; 1221, guide seat; 1222, support seat; 1223, spiral part;

[0039] 123. Load sensor;

[0040] 124. Controller;

[0041] 125. Support shaft;

[0042] 126, fixed seat;

[0043] 130. Excitation mechanism; 131. Second driving member; 132. Support; 133. Control unit;

[0044] 140. Positioning mechanism;

[0045] 141, positioning pad; 142, micro-motion pad; 143, positioning clamp; 144, third fastener;

[0046] 200. Hydraulic clamp;

[0047] 300, pillar;

[0048] 400, transfer member; 410, transfer fixture; 420, transfer handle; 430, transfer pin;

[0049] 2000, specimen. DETAILED DESCRIPTION

[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] The fretting fatigue testing device 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0053] like Figure 1 As shown, a fretting fatigue testing device 100 according to an embodiment of the present invention includes: a test bench 110 , a load mechanism 120 and an excitation mechanism 130 .

[0054] Among them, Figure 1As shown, the test bench 110 is suitable for being installed on the test machine 1000. The test machine 1000 is provided with a test piece 2000 to be tested. The test machine 1000 includes a hydraulic clamp 200. The hydraulic clamp 200 is used to provide a load in a first direction for the test piece 2000. It should be noted that the first direction mentioned here can be understood as Figure 1 The Z direction is shown in FIG. 1 , that is, the hydraulic clamp 200 is used to provide a load in the Z direction to the specimen 2000 .

[0055] It should also be noted that, since the test bench 110 is suitable for being installed on the testing machine 1000, the micro-motion fatigue testing device 100 can be installed on the testing machine 1000 using the test bench 110 to achieve the integration of the micro-motion fatigue testing device 100 and the testing machine 1000, and since the testing machine 1000 includes a hydraulic clamp 200 for providing a load in a first direction to the specimen 2000, when the micro-motion fatigue testing device 100 is integrated into the testing machine 1000, the hydraulic clamp 200 can be directly used to provide a load in the first direction to the specimen 2000, thereby avoiding the need to set the hydraulic clamp 200 on the micro-motion fatigue testing device 100, which is beneficial to simplifying the structure of the micro-motion fatigue testing device 100 and reducing the production cost of the micro-motion fatigue testing device 100.

[0056] In some embodiments, the test bench 110 is also used to provide a loading test platform for other devices (such as a load mechanism 120 , an actuation mechanism 130 , and a positioning mechanism 140 described below).

[0057] like Figure 1 As shown, the load mechanism 120 is disposed on the test bench 110, and the load mechanism 120 is used to provide a load in a second direction to the test piece 2000. The second direction mentioned here can be understood as Figure 1 The X direction is shown in FIG. 1 , that is, the load mechanism 120 is used to provide the load in the X direction to the specimen 2000 .

[0058] like Figure 1 As shown, the excitation mechanism 130 is arranged on the test bench 110, and the excitation mechanism 130 is used to provide vibration excitation in the third direction for the test piece 2000, and the third direction, the second direction and the first direction intersect each other. The third direction mentioned here can be understood as Figure 1 That is, the excitation mechanism 130 is used to provide vibration excitation in the Y direction for the specimen 2000, thereby realizing three-way loading of the specimen 2000 in the micro-motion fatigue test, so as to simulate the complex micro-motion fatigue condition of the specimen 2000 in the actual working condition, improve the accuracy of the micro-motion fatigue test, and thereby improve the working performance of the micro-motion fatigue test device 100.

[0059] It can be seen from the above structure that the fretting fatigue testing device 100 of the embodiment of the present invention integrates the testing machine 1000 with the fretting fatigue testing device 100 by installing the test bench 110 to the testing machine 1000, thereby implementing the fretting fatigue test on the testing machine 1000.

[0060] At the same time, since the testing machine 1000 includes a hydraulic clamp 200 for providing a load in the Z direction to the specimen 2000, the micro-motion fatigue testing device 100 includes a load mechanism 120 for providing a load in the X direction to the specimen 2000 and an excitation mechanism 130 for providing vibration excitation in the Y direction to the specimen 2000, after the testing machine 1000 and the micro-motion fatigue testing device 100 are integrated, the specimen 2000 can be loaded in three directions when conducting the micro-motion fatigue test, which can accurately simulate the complex micro-motion fatigue conditions of the specimen 2000 in actual working conditions, improve the accuracy of the micro-motion fatigue test, and thereby ensure the working performance of the micro-motion fatigue testing device 100.

[0061] In addition, by utilizing the hydraulic clamp 200 on the testing machine 1000 to provide a load in the Z direction for the specimen 2000, it is also possible to eliminate the need to set up the hydraulic clamp 200 on the micro-motion fatigue testing device 100. While achieving three-dimensional loading of the specimen 2000, it is also possible to simplify the structure of the micro-motion fatigue testing device 100, thereby reducing the production cost of the micro-motion fatigue testing device 100.

[0062] In summary, the fretting fatigue testing device 100 of the present application can not only realize three-dimensional loading of the test piece 2000, but also has low production cost.

[0063] It can be understood that compared with the prior art, when the micro-motion fatigue testing device 100 of the present application and the integrated testing machine 1000 perform micro-motion fatigue testing, the specimen 2000 can be loaded in three directions to accurately simulate the complex micro-motion fatigue conditions of the specimen 2000 when in use, thereby improving the accuracy of the micro-motion fatigue test.

[0064] In the description of the present invention, features defined as “first” or “second” may explicitly or implicitly include one or more such features, and are used to distinguish and describe the features, without any distinction in order or importance.

[0065] In some embodiments, in combination Figure 2 , Figure 4 and Figure 5 As shown, the fretting fatigue test device 100 further includes a positioning mechanism 140, which is used to position the test piece 2000, so as to improve the position stability of the test piece 2000, thereby facilitating the fretting fatigue test on the test piece 2000 and ensuring the accuracy of the test to a certain extent.

[0066] At the same time, positioning the test piece 2000 by the positioning mechanism 140 can also reduce the difficulty of positioning the test piece 2000 .

[0067] That is to say, the micro-motion fatigue testing device 100 of the present application can not only perform three-dimensional loading on the specimen 2000 during the micro-motion fatigue test, but also solve the problem of positioning the specimen 2000 during the micro-motion fatigue test, so as to further improve the accuracy of the micro-motion fatigue test.

[0068] In some embodiments, in combination Figure 1 and Figure 3 As shown, the test bench 110 is provided with a mounting groove 111 which runs through it, and at least part of the test piece 2000 and the load mechanism 120 are arranged in the mounting groove 111. Thus, the load mechanism 120 is arranged on the test bench 110, so that the test bench 110 is used to support the load mechanism 120, the position stability of the load mechanism 120 is improved, and the working performance of the load mechanism 120 is guaranteed to a certain extent. At the same time, the load mechanism 120 can be arranged close to the test piece 2000, so that the load mechanism 120 is used to provide the test piece 2000 with a load in the second direction, so as to effectively simulate the complex micro-motion fatigue condition of the test piece 2000 in the actual working condition.

[0069] In addition, placing the load mechanism 120 in the installation groove 111 can also avoid the load mechanism 120 occupying the space outside the test bench 110 to a certain extent, which is beneficial to reducing the size of the micro-motion fatigue testing device 100 and reducing the difficulty of assembling the micro-motion fatigue testing device 100 and the testing machine 1000.

[0070] In some embodiments, in combination Figure 1 , Figure 2 and Figure 5 As shown, the specimen 2000 is inserted into the mounting groove 111 so that the opposite ends of the specimen 2000 are respectively located on the outside of the mounting groove 111. This is conducive to connecting the opposite ends of the specimen 2000 in the first direction with the hydraulic clamp 200, thereby facilitating the use of the hydraulic clamp 200 to provide the specimen 2000 with a load in the first direction and reducing the difficulty of matching the specimen 2000 with the hydraulic clamp 200.

[0071] Optionally, combined Figure 3 , Figure 4 and Figure 5As shown, the positioning mechanism 140 is arranged on the load mechanism 120. On the one hand, the load mechanism 120 can be used to support the positioning mechanism 140, thereby improving the position stability of the positioning mechanism 140 and ensuring the working performance of the positioning mechanism 140 to a certain extent. On the other hand, the positioning mechanism 140 can be arranged close to the specimen 2000, so that the positioning mechanism 140 can be used to position the specimen 2000, thereby improving the position stability of the specimen 2000 and reducing the difficulty of positioning the specimen 2000.

[0072] In addition, by placing the positioning mechanism 140 on the load mechanism 120 , the positioning mechanism 140 can be placed in the installation groove 111 , which can avoid the positioning mechanism 140 occupying the space outside the test bench 110 to a certain extent, and further reduce the size of the micro-motion fatigue testing device 100 .

[0073] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the load mechanism 120 includes a first driving member 121 and a plurality of moving members 122, at least two of which are spaced apart at opposite sides of the test piece 2000 along the second direction, and the first driving member 121 is connected with one of the moving members 122 to drive the moving member 122 to move along the second direction. In this way, the at least two moving members 122 cooperate to squeeze the test piece 2000, so as to achieve the purpose of using the load mechanism 120 to provide the test piece 2000 with a load in the second direction, thereby simulating the complex micro-motion fatigue condition of the test piece 2000 when in use.

[0074] The first driving member 121 mentioned here can be understood as a driving motor.

[0075] Of course, in some other embodiments, the first driving member 121 may also be a driving cylinder, a driving oil cylinder, etc.

[0076] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0077] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the load mechanism 120 includes two moving members 122, and the two moving members 122 and the first driving member 121 are all arranged in the installation groove 111. One end of the first driving member 121 is fixedly connected to the groove wall of the installation groove 111, and the other end of the first driving member 121 is connected to one of the moving members 122 through a support shaft 125, so that the first driving member 121 can be used to drive the moving member 122 to move along the second direction.

[0078] At the same time, one end of the other movable member 122 facing away from the specimen 2000 is fixedly connected to the groove wall of the mounting groove 111 through the support shaft 125 and the fixed seat 126 to achieve a fixed connection between the other movable member 122 and the mounting groove 111 and reduce the connection difficulty. The end of the other movable member 122 facing the specimen 2000 is stop-fitted with the specimen 2000.

[0079] In a specific example, the other movable member 122 is fixed, and the first driving member 121 is used to drive one of the movable members 122 to move along the second direction. When one of the movable members 122 moves and cooperates with the specimen 2000, the two movable members 122 can be used to cooperate to extrude the specimen 2000, so as to achieve the purpose of using the load mechanism 120 to provide the specimen 2000 with a load in the second direction, thereby simulating the complex micro-motion fatigue condition of the specimen 2000 when in use.

[0080] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the load mechanism 120 includes a load sensor 123 and a controller 124. The load sensor 123 is connected between the first driving member 121 and one of the moving members 122. The load sensor 123 is used to detect the load applied by the first driving member 121. Thus, the output load of the first driving member 121 can be accurately obtained, so that the output load of the first driving member 121 can be controlled according to the detection result of the load sensor 123, so that the first driving member 121 can output a constant load, thereby improving the accuracy of the fretting fatigue test.

[0081] In some embodiments, Figure 5 As shown, one end of the load sensor 123 is connected to the output shaft of the first driving member 121 through a fixed seat 126, and the other end of the load sensor 123 is connected to one of the moving members 122 through a support shaft 125, thereby connecting the load sensor 123 between the first driving member 121 and one of the moving members 122, so that the load sensor 123 can be used to detect the load applied by the first driving member 121.

[0082] Optionally, the controller 124 is electrically connected to the load sensor 123 and the first driving member 121, respectively, and the controller 124 is used to receive the detection result of the load sensor 123, and the controller 124 is also used to control the output load of the first driving member 121. In this way, the controller 124 can control the output load of the first driving member 121 according to the detection result of the load sensor 123, so that the first driving member 121 can output a constant load, so that the first driving member 121 can be used to apply a constant load in the X direction to the test piece 2000, so as to solve the problem of uneven load in the micro-motion fatigue test process in the prior art, so as to further improve the accuracy of the micro-motion fatigue test.

[0083] In a specific example, when the first driving member 121 drives one of the moving members 122 to move, the load sensor 123 detects the load applied by the first driving member 121 in real time and transmits the detection result to the controller 124. When the controller 124 determines that the load applied by the first driving member 121 is inconsistent with the preset load, the controller 124 is used to adjust the output load of the first driving member 121, so that the first driving member 121 can output a constant load.

[0084] In summary, the micro-motion fatigue testing device 100 of the present application cooperates with the testing machine 1000 to not only realize three-way loading of the test piece 2000 during the micro-motion fatigue test, but also simultaneously provides auxiliary devices for positioning and uniform loading (positioning mechanism 140 and load sensor 123), thereby solving the problems of positioning and uneven loading during the micro-motion fatigue test in the prior art, and effectively improving the accuracy of the micro-motion fatigue test.

[0085] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the moving member 122 includes a guide seat 1221 and a support seat 1222, the guide seat 1221 is movably matched with the groove wall of the installation groove 111, the support seat 1222 is arranged on the guide seat 1221, and the first driving member 121 is matched and connected with one of the support seats 1222, so as to clamp the test piece 2000 by using the support seat 1222. In this way, the purpose of using the load mechanism 120 to provide the test piece 2000 with a load in the second direction is achieved, and the difficulty of the load mechanism 120 applying the load to the test piece 2000 is reduced.

[0086] Among them, by movably cooperating the guide seat 1221 with the groove wall of the installation groove 111, the movable cooperation of the movable member 122 and the groove wall of the installation groove 111 is realized. While reducing the difficulty of movable cooperation between the movable member 122 and the groove wall of the installation groove 111, the position accuracy of the movable member 122 when moving along the second direction can be guaranteed, which is conducive to using the load mechanism 120 to provide a load in the second direction for the specimen 2000.

[0087] In some embodiments, a guide protrusion is provided on the guide seat 1221 and protrudes toward the groove wall of the mounting groove 111. A guide rail is provided on the groove wall of the mounting groove 111 to cooperate with the guide protrusion. The guide rail extends along the second direction. The guide rail and the guide protrusion cooperate to achieve movable cooperation between the guide seat 1221 and the groove wall of the mounting groove 111, and facilitate the use of the groove wall of the mounting groove 111 to limit the moving direction of the moving member 122, so that when the first driving member 121 drives the moving member 122, the moving member 122 can effectively move along the second direction, and facilitate the use of the load mechanism 120 to provide a load in the second direction for the specimen 2000.

[0088] In some embodiments, both ends of the guide seat 1221 in the third direction are movably matched with the groove wall of the installation groove 111 through guide protrusions, limiting the guide seat 1221 to move only along the second direction.

[0089] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the positioning mechanism 140 includes a positioning pad 141 and a plurality of micro-motion pads 142. The positioning pad 141 is movably disposed on the support seat 1222 along the second direction. The positioning pad 141 is provided with a positioning groove running through it. At least part of the micro-motion pad 142 and at least part of the test piece 2000 are disposed in the positioning groove. The positioning pad 141 is used to position the micro-motion pad 142 and the test piece 2000. In this way, the difficulty of assembling the micro-motion pad 142 and the test piece 2000 relative to the load mechanism 120 can be reduced, and the assembly accuracy of the micro-motion pad 142 and the test piece 2000 relative to the load mechanism 120 can be improved, so that the micro-motion pad 142 and the test piece 2000 can be accurately assembled to the load mechanism 120, which is conducive to using the load mechanism 120 to provide the test piece 2000 with a load in the second direction.

[0090] At the same time, by movably arranging the positioning pad 141 on the support seat 1222 along the second direction, on the one hand, it is possible to arrange the positioning mechanism 140 on the load mechanism 120, thereby improving the position stability of the positioning mechanism 140 and enabling the positioning mechanism 140 to be arranged close to the specimen 2000; on the other hand, it is also possible to prevent the positioning pad 141 from hindering the movement of the support seat 1222 along the second direction, so as to facilitate the use of at least two support seats 1222 to cooperate in extruding the specimen 2000, so as to achieve the purpose of using the load mechanism 120 to provide the specimen 2000 with a load in the second direction.

[0091] In some embodiments, an elongated hole extending along the second direction is provided on the support seat 1222, and the positioning pad 141 is connected to the support seat 1222 through the elongated hole to achieve movable cooperation between the positioning pad 141 and the support seat 1222 in the second direction, and reduce the difficulty of movable cooperation between the positioning pad 141 and the support seat 1222, so that the positioning pad 141 can be movably arranged on the support seat 1222 along the second direction.

[0092] Alternatively, if Figure 5 As shown, at least two micro-motion pads 142 are arranged at intervals on opposite sides of the specimen 2000 along the second direction and are fixedly connected to the support seat 1222. The support seat 1222 is used to drive the micro-motion pads 142 to move so as to clamp the specimen 2000 using the micro-motion pads 142. Thus, a constant load in the X direction is applied to the specimen 2000 to simulate the micro-motion wear or fatigue phenomenon of the specimen 2000 in actual working conditions.

[0093] In some embodiments, Figure 5 As shown, the positioning mechanism 140 includes two micro-motion pads 142, and the two micro-motion pads 142 are arranged at opposite sides of the specimen 2000 along the second direction. In the second direction, the positioning plate 141 is provided with a positioning groove extending therethrough, and the extension length thereof is greater than the sum of the extension length of the two micro-motion pads 142 and the thickness of the specimen 2000, so that the support seat 1222 can effectively drive the micro-motion pad 142 to move relative to the positioning plate 141, thereby realizing the use of the micro-motion pad 142 to clamp the specimen 2000.

[0094] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the support seat 1222 is arranged on the guide seat 1221 through a plurality of screw members 1223, so that the position of the support seat 1222 in the first direction is adjustable. In this way, on the one hand, the clamping position of the movable member 122 on the specimen 2000 can be adjusted, so as to accurately simulate the complex micro-motion fatigue condition of the specimen 2000 when in use, thereby improving the accuracy of the micro-motion fatigue test. On the other hand, because the positioning pad 141 is arranged on the support seat 1222 and the micro-motion pad 142 is arranged in the positioning groove, it is also possible to use the plurality of screw members 1223 to adjust the horizontal plane of the micro-motion pad 142 in the first direction, and make the plurality of micro-motion pads 142 be on the same horizontal plane, so that the plurality of micro-motion pads 142 can evenly load the load on the specimen 2000 in the X direction, so as to effectively simulate the complex micro-motion fatigue condition of the specimen 2000 when in use, thereby improving the accuracy of the micro-motion fatigue test.

[0095] It should be noted that the screw member 1223 mentioned here can be understood as a bolt or a stud, etc.

[0096] In some embodiments, a plurality of spiral members 1223 are provided on the circumference of the support seat 1222. The cooperation of the plurality of spiral members 1223 can not only make the position of the support seat 1222 in the first direction adjustable, but also adjust the plane of the support seat 1222 in the first direction, so as to adjust the horizontal plane of the micro-motion pad 142 in the first direction.

[0097] In some embodiments, the load mechanism 120 further includes a laser level instrument, which is used to detect the flatness of the support base 1222 in the first direction, thereby facilitating adjustment of the plane of the support base 1222 in the first direction through the screw member 1223.

[0098] In some embodiments, the first driving member 121 and the support seat 1222 are movably cooperated in the first direction. While the first driving member 121 is used to drive the support seat 1222 to move in the second direction, the position of the support seat 1222 in the first direction can be effectively adjusted through the spiral member 1223, thereby reducing the difficulty of adjusting the position of the support seat 1222 in the first direction, thereby achieving the adjustment of the clamping position of the movable member 122 on the specimen 2000 and the adjustment of the horizontal plane of the micro-motion pad 142 in the first direction, so as to accurately simulate the complex micro-motion fatigue condition of the specimen 2000 when in use.

[0099] In some embodiments, a long strip hole extending along the first direction is provided on the support seat 1222, and the output end of the first driving member 121 is connected to the support seat 1222 through the long strip hole to achieve movable cooperation between the first driving member 121 and the support seat 1222 in the first direction and reduce the difficulty of movable cooperation between the first driving member 121 and the support seat 1222.

[0100] Through the above arrangement, in a specific example, the first driving member 121 outputs a load force in the X direction, and transmits it to one of the support seats 1222 in turn through the load sensor 123 and the support shaft 125, so as to achieve the use of the support seat 1222 to clamp the specimen 2000, thereby achieving the application of an X-direction load to the specimen 2000. At this time, the load sensor 123 can accurately identify the load applied by the first driving member 121, and send it to the controller 124. The controller 124 can detect and control the output load force of the first driving member 121 during the test, so as to achieve the use of the first driving member 121 to apply a constant load in the X direction toward the specimen 2000.

[0101] In some embodiments, in combination Figure 4 and Figure 5 As shown, the positioning mechanism 140 further includes a positioning clamping plate 143. In the first direction, one end of the micro-motion pad 142 abuts against the support seat 1222, and the other end of the micro-motion pad 142 protrudes from the positioning groove. The positioning clamping plate 143 is arranged on the side of the micro-motion pad 142 away from the support seat 1222, and the positioning clamping plate 143 is fixedly connected to the support seat 1222 to fix the micro-motion pad 142. Thus, the micro-motion pad 142 is firmly mounted on the support seat 1222, and the micro-motion pad 142 is prevented from moving or loosening during the test to a certain extent, thereby ensuring the working performance of the micro-motion pad 142.

[0102] In some embodiments, in the first direction, the thickness of the micro-motion pad 142 is greater than the thickness of the positioning pad 141 , so that the other end of the micro-motion pad 142 can protrude from the positioning groove to facilitate fixing the micro-motion pad 142 and reduce the difficulty of fixing the micro-motion pad 142 .

[0103] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the positioning mechanism 140 also includes a third fastener 144, and the positioning clamp 143 is fixedly connected to the support seat 1222 through the third fastener 144 to achieve fixed connection between the positioning clamp 143 and the support seat 1222, and reduce the difficulty of fixed connection between the positioning clamp 143 and the support seat 1222, thereby facilitating the use of the positioning clamp 143 and the support seat 1222 to cooperate to fix the micro-motion pad 142, thereby ensuring the clamping effect of the micro-motion pad 142 on the specimen 2000 to a certain extent.

[0104] In some embodiments, the third fastener 144 includes multiple third fasteners 144, which are arranged at circumferential intervals along the positioning clamp 143 to increase the fixed connection effect between the positioning clamp 143 and the support seat 1222, thereby increasing the clamping effect of the positioning clamp 143 and the support seat 1222 on the micro-motion pad 142.

[0105] The third fastener 144 mentioned here can be understood as a bolt or a screw, etc.

[0106] It can also be understood here that the positioning clamp 143 and the support seat 1222 are used to clamp the positioning micro-motion pad 142, and the micro-motion pad 142 applies a constant load to the specimen 2000, so as to achieve the purpose of using the load mechanism 120 to provide the specimen 2000 with an X-direction load, thereby simulating the working environment of the specimen 2000.

[0107] In some embodiments, in combination Figure 1 and Figure 2 As shown, the test bench 110 includes a first support member 112 and a second support member 113, the first support member 112 is arranged at the radial inner side of the second support member 113, the first support member 112 is provided with a mounting groove 111, and the excitation mechanism 130 includes a second driving member 131, the second driving member 131 is arranged at the second support member 113 and is arranged opposite to the test piece 2000 along the third direction, and the output shaft of the second driving member 131 is connected to the test piece 2000. That is to say, at least part of the test piece 2000 and the load mechanism 120 are arranged in the first support member 112, and the second driving member 131 of the excitation mechanism 130 is arranged at the second support member 113, so that the load mechanism 120 and the excitation mechanism 130 are relatively independent, and to a certain extent, the load mechanism 120 and the excitation mechanism 130 are prevented from influencing each other (such as: the vibrations generated by the load mechanism 120 and the excitation mechanism 130 are transmitted to each other), thereby improving the working performance of the load mechanism 120 and the excitation mechanism 130.

[0108] At the same time, by arranging the second driving member 131 of the excitation mechanism 130 and the specimen 2000 to be arranged relative to each other along the third direction, it is beneficial to utilize the excitation mechanism 130 to provide vibration excitation in the third direction for the specimen 2000, thereby reducing the excitation difficulty of the excitation mechanism 130, thereby simulating the complex micro-motion fatigue condition of the specimen 2000 when in use and improving the accuracy of the micro-motion fatigue test.

[0109] The second driving member 131 mentioned here can be understood as a motor, which outputs the vibration excitation required for the test and transmits it to the test piece 2000 through the motor shaft, and then applies the vibration excitation in the third direction to the test piece 2000.

[0110] Of course, in some other embodiments, the second driving member 131 may also be a driving cylinder, a driving oil cylinder, etc.

[0111] In some embodiments, in combination Figure 1 and Figure 2 As shown, the second support member 113 includes a first support plate 1131 and a second support plate 1132. The first support member 112 is arranged on the radial inner side of the second support member 113 and abuts against the second support plate 1132 through a support block 114, so as to realize supporting the first support member 112 by the second support member 113 and improve the position stability of the first support member 112.

[0112] In some embodiments, in combination Figure 1 and Figure 2 As shown, both ends of the first support plate 1131 and the second support plate 1132 in the second direction are connected with the mounting assembly 115 through the first fastener 116, and the mounting assembly 115 includes a first mounting member 1151, a second mounting member 1152 and a second fastener 1153. The first mounting member 1151 and the second mounting member 1152 are matched and connected by the second fastener 1153, and a mounting hole is formed between the first mounting member 1151 and the second mounting member 1152. The mounting assembly 115 is installed on the column 300 of the testing machine 1000 through the mounting hole to realize the installation of the test bench 110 to the testing machine 1000, thereby realizing the integration of the micro-motion fatigue testing device 100 and the testing machine 1000 and reducing the assembly difficulty of the micro-motion fatigue testing device 100 and the testing machine 1000.

[0113] The first fastener 116 mentioned here can be understood as a connecting bolt or a connecting screw, etc.; the second fastener 1153 can be understood as a fastening bolt or a fastening screw, etc.

[0114] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3As shown, the excitation mechanism 130 includes a support 132, which is arranged on the second support member 113 and is arranged opposite to the specimen 2000 along the third direction. The second driving member 131 is arranged on the support 132 to realize that the second driving member 131 is arranged on the second support member 113, and the difficulty of matching the second driving member 131 with the second support member 113 is reduced, and it is convenient to improve the connection strength between the second driving member 131 and the second support member 113, thereby improving the position stability of the second driving member 131 and ensuring the working performance of the second driving member 131.

[0115] In a specific example, combined with Figure 1 , Figure 2 and Figure 3 As shown, the support 132 is disposed on the first support plate 1131 .

[0116] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, the excitation mechanism 130 also includes a control unit 133, and the control unit 133 is electrically connected to the second driving member 131. The control unit 133 can monitor and adjust the parameters of the output excitation of the second driving member 131, so as to control the second driving member 131 to provide vibration excitation in the third direction for the specimen 2000, reduce the driving difficulty of the second driving member 131, and ensure the accuracy of the output excitation vibration of the second driving member 131 to a certain extent, which is conducive to accurately simulating the complex micro-motion fatigue conditions of the specimen 2000 when in use, and improving the accuracy of the micro-motion fatigue test.

[0117] The testing machine 1000 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0118] like Figure 1 As shown, a testing machine 1000 according to an embodiment of the present invention includes: a column 300 , a fretting fatigue testing device 100 and a plurality of hydraulic clamps 200 .

[0119] The micro-motion fatigue test device 100 is the micro-motion fatigue test device 100 mentioned above, and the specific structure of the micro-motion fatigue test device 100 is not described here, and the test bench 110 is connected with the column 300. In this way, the test bench 110 is installed on the testing machine 1000, and the micro-motion fatigue test device 100 and the testing machine 1000 are integrated.

[0120] like Figure 1As shown, a plurality of hydraulic clamps 200 are respectively connected to opposite ends of the test piece 2000 in the first direction. The hydraulic clamps 200 are used to provide a load in the first direction for the test piece 2000. This avoids setting the hydraulic clamps 200 on the fretting fatigue test device 100, and can also realize three-dimensional loading of the test piece 2000 during the fretting fatigue test, thereby simulating the complex fretting fatigue condition of the test piece 2000 during use and improving the accuracy of the fretting fatigue test.

[0121] Among them, one of the multiple hydraulic clamps 200 is rotatably connected to the specimen 2000, so that the excitation mechanism 130 can provide vibration excitation in the third direction for the specimen 2000. That is to say, when the multiple hydraulic clamps 200 are respectively connected to the two opposite ends of the specimen 2000 in the first direction, one of the hydraulic clamps 200 is rotatably connected to the specimen 2000, so that while the hydraulic clamp 200 is used to provide the specimen 2000 with a load in the first direction, the mutual interference between the loading in the first direction and the excitation in the third direction can be avoided, so that the excitation mechanism 130 can provide the specimen 2000 with vibration excitation in the third direction, so as to achieve the purpose of three-way loading of the specimen 2000 during the fretting fatigue test, and improve the accuracy of the fretting fatigue test.

[0122] It can be seen from the above structure that the testing machine 1000 of the embodiment of the present invention, by adopting the aforementioned micro-motion fatigue testing device 100, can realize three-way loading of the test piece 2000 during the micro-motion fatigue test, thereby simulating the complex micro-motion fatigue condition of the test piece 2000 when in use, improving the accuracy of the micro-motion fatigue test, and ensuring the working performance of the testing machine 1000.

[0123] In some embodiments, in combination Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, an adapter 400 is provided between one of the hydraulic clamps 200 and the test piece 2000, and the adapter 400 includes a rotatably connected adapter clamp 410 and an adapter handle 420, the adapter clamp 410 is fixedly connected to the test piece 2000, and the adapter handle 420 is fixedly connected to the hydraulic clamp 200. In this way, the adapter 400 can be used to realize the rotational connection between one of the hydraulic clamps 200 and the test piece 2000, reducing the difficulty of the rotational connection between one of the hydraulic clamps 200 and the test piece 2000, thereby avoiding mutual interference between the loading in the first direction and the excitation in the third direction to a certain extent, facilitating the three-way loading of the test piece 2000 during the fretting fatigue test, and improving the accuracy of the fretting fatigue test.

[0124] In some embodiments, Figure 5As shown, the adapter 400 also includes an adapter pin 430 , and the adapter clamp 410 and the adapter handle 420 are connected via the adapter pin 430 to achieve a rotational connection between the adapter clamp 410 and the adapter handle 420 , thereby reducing the difficulty of the rotational connection between the adapter clamp 410 and the adapter handle 420 .

[0125] Alternatively, if Figure 5 As shown, the transfer pin 430 extends along the second direction to enable the transfer fixture 410 and the transfer handle 420 to rotate around the second direction, thereby avoiding mutual interference between the loading in the first direction and the excitation in the third direction.

[0126] It should be noted that when a transition piece 400 is provided between the hydraulic fixture 200 and the test piece 2000, Figure 3 and Figure 5 As shown, the second driving member 131 outputs the vibration excitation required for the test and transmits it to the adapter fixture 410 of the adapter 400 through the motor shaft, thereby achieving vibration excitation in the third direction applied to the test piece 2000, reducing the difficulty of transmitting the vibration excitation of the second driving member 131.

[0127] The testing machine 1000 of the present application will be described in detail below with reference to the accompanying drawings.

[0128] like Figure 1 As shown, a test piece 2000 to be tested is disposed on the testing machine 1000 , and the testing machine 1000 includes a fretting fatigue testing device 100 , a hydraulic fixture 200 , a column 300 and an adapter 400 .

[0129] Among them, combined Figure 1-Figure 5 As shown, the micro-motion fatigue test device 100 includes a test bench 110, a load mechanism 120, an excitation mechanism 130 and a positioning mechanism 140 (the specific structure of the positioning mechanism 140 can be found in Figure 4 and Figure 5 ), the test bench 110 includes a first support member 112 and a second support member 113, the second support member 113 includes a first support plate 1131 and a second support plate 1132, the first support member 112 is arranged on the radial inner side of the second support member 113 and is stopped on the second support plate 1132 by a support block 114, and a mounting groove 111 is provided in the first support member 112.

[0130] Combination Figure 1 and Figure 2As shown, both ends of the first support plate 1131 and the second support plate 1132 in the second direction are connected to the mounting assembly 115 through the first fastener 116, and the mounting assembly 115 includes a first mounting member 1151, a second mounting member 1152 and a second fastener 1153. The first mounting member 1151 and the second mounting member 1152 are matched and connected by the second fastener 1153, and a mounting hole is formed between the first mounting member 1151 and the second mounting member 1152. The mounting assembly 115 is installed on the column 300 of the testing machine 1000 through the mounting hole to realize the installation of the test bench 110 to the testing machine 1000, thereby realizing the integration of the micro-motion fatigue testing device 100 and the testing machine 1000.

[0131] like Figure 1 As shown, the hydraulic clamp 200 includes two hydraulic clamps 200, which are respectively connected to the opposite ends of the specimen 2000 in the first direction, and one of the hydraulic clamps 200 is rotatably connected to the specimen 2000 through an adapter 400. While the hydraulic clamp 200 is used to provide the specimen 2000 with a load in the first direction, the excitation mechanism 130 can also provide the specimen 2000 with vibration excitation in the third direction.

[0132] Combination Figure 3 , Figure 4 and Figure 5 As shown, the load mechanism 120 and the positioning mechanism 140 are both arranged in the installation groove 111, the load mechanism 120 includes a first driving member 121, two moving members 122, a load sensor 123 and a controller 124, the two moving members 122 are arranged at opposite sides of the test piece 2000 along the second direction, the moving member 122 includes a guide seat 1221 and a support seat 1222, the guide seat 1221 is movably matched with the groove wall of the installation groove 111, the support seat 1222 is arranged on the guide seat 1221 through a screw member 1223, so that the position of the support seat 1222 in the first direction is adjustable, one of the moving members 122 is matched and connected with the output end of the first driving member 121, and the other is matched and connected with the output end of the first driving member 121. A movable member 122 is fixedly connected to the side wall of the mounting groove 111 through a support shaft 125 and a fixed seat 126 respectively. The first driving member 121 is used to drive one of the movable members 122 to move along the second direction. The load sensor 123 is connected between the first driving member 121 and one of the movable members 122 through the fixed seat 126. The load sensor 123 is used to detect the load applied by the first driving member 121 and is electrically connected to the controller 124. The controller 124 is used to receive the detection result of the load sensor 123 and control the output load of the first driving member 121, so that the load mechanism 120 can provide the specimen 2000 with a load uniformly loaded in the second direction.

[0133] Combination Figure 4 and Figure 5As shown, the positioning mechanism 140 includes a positioning pad 141, two micro-motion pads 142 and a positioning clamping plate 143. The positioning pad 141 is movably arranged on the support seat 1222 along the second direction. A positioning groove is provided on the positioning pad 141, at least part of the micro-motion pad 142 and at least part of the test piece 2000 are arranged in the positioning groove, and the two micro-motion pads 142 are arranged at opposite sides of the test piece 2000 along the second direction and fixedly connected to the support seat 1222. The positioning pad 141 is used to move the support seat 1222 along the second direction. In order to position the micro-motion pad 142 and the specimen 2000, in a first direction, one end of the micro-motion pad 142 stops at the support seat 1222, and the other end of the micro-motion pad 142 protrudes from the positioning groove, and the positioning clamp 143 is arranged on the side of the micro-motion pad 142 away from the support seat 1222, and the positioning clamp 143 is fixedly connected to the support seat 1222 to fix the micro-motion pad 142, and the support seat 1222 is used to drive the micro-motion pad 142 to move so as to clamp the specimen 2000 using the micro-motion pad 142.

[0134] Combination Figure 1 , Figure 2 and Figure 3 As shown, the excitation mechanism 130 includes a second driving member 131, a support 132 and a control unit 133. The second driving member 131 is arranged on the first support plate 1131 through the support 132 and is electrically connected to the control unit 133. The output shaft of the second driving member 131 is connected to the specimen 2000. The control unit 133 is used to control the second driving member 131 to provide vibration excitation in the third direction for the specimen 2000.

[0135] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0136] Other structures of the fretting fatigue testing device 100 and the testing machine 1000 having the same according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0137] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0138] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fretting fatigue test device, characterized in that: include: A test bench (110), the test bench (110) being suitable for being installed on a test machine (1000), the test machine (1000) being provided with a test piece (2000) to be tested, the test machine (1000) comprising a hydraulic clamp (200), the hydraulic clamp (200) being used to provide a load in a first direction for the test piece (2000); a load mechanism (120), the load mechanism (120) being disposed on the test bench (110), and the load mechanism (120) being used to provide a load in a second direction for the test piece (2000); An excitation mechanism (130), the excitation mechanism (130) being arranged on the test bench (110), the excitation mechanism (130) being used to provide vibration excitation in a third direction for the test piece (2000), the third direction, the second direction and the first direction intersecting in pairs.

2. The fretting fatigue testing device according to claim 1, characterized in that: It also includes a positioning mechanism (140), wherein the positioning mechanism (140) is used to position the test piece (2000).

3. The fretting fatigue testing device according to claim 2, characterized in that: The test bench (110) is provided with a mounting groove (111) penetrating therethrough, and at least a portion of the test piece (2000) and the load mechanism (120) are arranged in the mounting groove (111); The positioning mechanism (140) is arranged on the loading mechanism (120).

4. The fretting fatigue testing device according to claim 3, characterized in that: The load mechanism (120) comprises a first driving member (121) and a plurality of moving members (122), at least two of the moving members (122) being arranged at intervals on opposite sides of the test piece (2000) along the second direction, and the first driving member (121) is cooperatively connected with one of the moving members (122) to drive the moving member (122) to move along the second direction.

5. The fretting fatigue testing device according to claim 4, characterized in that: The load mechanism (120) comprises a load sensor (123) and a controller (124), wherein the load sensor (123) is connected between the first driving member (121) and one of the moving members (122), and the load sensor (123) is used to detect the load applied by the first driving member (121); The controller (124) is electrically connected to the load sensor (123) and the first driving member (121) respectively. The controller (124) is used to receive the detection result of the load sensor (123). The controller (124) is also used to control the output load of the first driving member (121).

6. The fretting fatigue testing device according to claim 4, characterized in that: The movable member (122) comprises a guide seat (1221) and a support seat (1222); the guide seat (1221) is movably matched with the groove wall of the mounting groove (111); the support seat (1222) is arranged on the guide seat (1221); the first driving member (121) is matched and connected with one of the support seats (1222) so as to use the support seat (1222) to clamp the test piece (2000).

7. The fretting fatigue testing device according to claim 6, characterized in that: The positioning mechanism (140) comprises a positioning pad (141) and a plurality of micro-motion pads (142); the positioning pad (141) is movably arranged on the support seat (1222) along the second direction; a positioning groove is arranged on the positioning pad (141) and passes through the positioning pad (141); at least part of the micro-motion pad (142) and at least part of the test piece (2000) are arranged in the positioning groove; the positioning pad (141) is used to position the micro-motion pad (142) and the test piece (2000); At least two of the micro-motion pads (142) are arranged at intervals along the second direction on opposite sides of the test piece (2000) and are fixedly connected to the support seat (1222); the support seat (1222) is used to drive the micro-motion pad (142) to move so as to clamp the test piece (2000) using the micro-motion pad (142); The support seat (1222) is arranged on the guide seat (1221) via a plurality of screw members (1223), so that the position of the support seat (1222) in the first direction is adjustable.

8. The fretting fatigue testing device according to claim 7, characterized in that: The positioning mechanism (140) further comprises a positioning clamping plate (143); in the first direction, one end of the micro-motion pad (142) abuts against the support seat (1222), and the other end of the micro-motion pad (142) protrudes from the positioning groove; the positioning clamping plate (143) is arranged on a side of the micro-motion pad (142) away from the support seat (1222); the positioning clamping plate (143) is fixedly connected to the support seat (1222) to fix the micro-motion pad (142).

9. The fretting fatigue testing device according to claim 3, characterized in that: The test bench (110) comprises a first support member (112) and a second support member (113), wherein the first support member (112) is arranged radially inward of the second support member (113), and the first support member (112) is provided with the mounting groove (111). The excitation mechanism (130) comprises a second driving member (131), wherein the second driving member (131) is arranged on the second support member (113) and is arranged opposite to the test piece (2000) along the third direction, and an output shaft of the second driving member (131) is connected to the test piece (2000).

10. A testing machine, characterized in that: include: Column (300); A micro-motion fatigue test device, wherein the micro-motion fatigue test device is a micro-motion fatigue test device according to any one of claims 1 to 9, wherein the test bench (110) is cooperatively connected with the column (300); A plurality of hydraulic clamps (200), wherein the plurality of hydraulic clamps (200) are respectively connected to opposite ends of the test piece (2000) in the first direction; Wherein, one of the plurality of hydraulic clamps (200) is rotatably connected to the test piece (2000), so that the excitation mechanism (130) can provide vibration excitation in the third direction for the test piece (2000).

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