Device for testing interface mechanical properties under complex loads

Abstract

The present invention discloses a device for detecting mechanical properties of interfaces under complex loads, including a fixed workbench, on which a compression shear force loading unit and a detection unit are arranged, the compression shear force loading unit is used to clamp two samples, and simultaneously load positive pressure and friction force on the samples, the compression shear force loading unit includes a force sensor for detecting positive pressure and friction force, the detection unit includes a probe and a probe support, the probe support can drive the probe to move along the X-axis, the Y-axis, and the Z-axis, the probe is connected to an electrical measurement system through a wire, and the contact between the probe and the sample can detect the mechanical properties of the contact interface of the sample. The present invention can accurately measure the mechanical properties of the contact interface of two materials under the joint action of positive pressure and friction force through the compression shear force loading unit and the detection unit.

Description

Technical Field

[0001] The invention relates to the technical field of material detection, and in particular to a device for detecting interface mechanical properties under complex loads. Background Art

[0002] There are a large number of contact interfaces between the internal components of major engineering equipment. The contact interface is the key part for force transmission, electrical conduction and heat transfer between components. Due to the complexity, randomness and opacity of the rough interface, there are both positive pressure and friction inside the interface. The contact mechanical properties of the engineering structure interface under the combined action of compression and shear are different from those under the action of pressure only.

[0003] The existing theoretical model of contact mechanics represents the rough interface contact process as a positive contact between a rigid plane and an equivalent rough surface, which cannot take into account the effect of friction and cannot theoretically study the effect of friction on the mechanical properties of interface contact. Therefore, when we study the effect of friction on the mechanical properties of interface contact from an experimental perspective, one of the key problems we face is that the preparation of a hardware measurement platform for positive pressure, friction loading, and synchronous measurement and control is the key to accurately measuring the mechanical properties of interface contact under the combined action of compression and shear. The existing friction measurement devices mainly include: uniaxial friction measurement devices, multi-axis force sensor devices, friction coefficient measurement devices, pressure-friction integrated loading devices, and customized test platforms, etc. These devices generally have the same defects and shortcomings: it is difficult to achieve synchronous loading and measurement and control of positive pressure and friction. Summary of the invention

[0004] The purpose of the present invention is to provide a device for detecting interface mechanical properties under complex loads, aiming to accurately measure the mechanical properties of the contact interface of two samples under the combined action of normal pressure and friction force.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A device for detecting mechanical properties of an interface under complex loads, comprising a fixed workbench, on which a compressive shear force loading unit and a detection unit are arranged;

[0007] The compressive shear force loading unit comprises a fixed bracket, a first movable bracket, and a second movable bracket which are arranged in parallel in sequence, the first movable bracket is used to fix sample one, the second movable bracket is used to fix sample two, the fixed bracket is fixed on a fixed workbench, the first movable bracket is connected to the fixed bracket through a first guide rail module, the first guide rail module comprises a first guide rail and a first slider, the first guide rail is fixed on the fixed bracket, the first slider is fixed on the first movable bracket, the first guide rail and the first slider are slidably connected, a bracket two driving module is arranged at the bottom of the second movable bracket, the bracket two driving module drives the second movable bracket to move horizontally in a tangential direction, the bracket two driving module is fixed on a fixed workbench, a top plate is vertically connected to the end of the fixed bracket, the side end of the first movable bracket can be projected onto the top plate, and a first force sensor is arranged on the top plate; the compressive shear force loading unit also comprises a clamping module, the clamping module is used to vertically extrude the two side parts of the sample to apply positive pressure, and the extrusion force is adjustable;

[0008] The detection unit includes a probe and a probe holder. The probe holder drives the probe to move along the X-axis, Y-axis and Z-axis directions. The probe holder includes an X-axis drive module, a Y-axis drive module and a Z-axis drive module. The probe is fixed on the Z-axis drive module and points vertically to sample 2. The end of the probe is connected to an electrical measurement system through a wire.

[0009] Preferably, the second bracket driving module adopts a screw slider mechanism, which includes a screw slider, a screw, and a servo motor. The second movable bracket is fixed on the screw slider, the screw slider is slidably connected to the screw, and the servo motor drives the screw to rotate. The speed of the servo motor is controllable. Controlling the speed of the servo motor can realize the change of the relative sliding speed between sample one and sample two.

[0010] Preferably, the clamping module includes a third movable bracket, a first servo electric push rod, and a sample clamping bracket. The third movable bracket is connected to the fixed bracket through a second guide rail module. The second guide rail module includes a second guide rail and a second slider. The second guide rail is fixed on the fixed bracket, and the second slider is fixed on the third movable bracket. The second guide rail and the second slider are slidably connected. The other side of the third movable bracket is vertically connected to the first servo electric push rod, and the first servo electric push rod is connected to the sample clamping bracket. One end of the sample clamping bracket extends to the side of the second movable bracket. The second force sensor and the third force sensor are arranged perpendicular to the second movable bracket.

[0011] Preferably, the sample clamping bracket includes a first crossbeam, a second crossbeam, a connecting rod, and a push rod. The first crossbeam is horizontally arranged on one side of the third movable bracket and is parallel to the third movable bracket. The second crossbeam is arranged on the side of the second movable bracket and is parallel to the second movable bracket. The two ends of the first crossbeam and the two ends of the second crossbeam are respectively fixedly connected by connecting rods, and the connecting rods are arranged above the second movable bracket and the third movable bracket. Push rods are respectively arranged vertically downward at both ends of the second crossbeam; the second force sensor and the third force sensor are respectively installed on the sides of the push rods.

[0012] Preferably, the first movable bracket is L-shaped, including a long side section and a short side section, the short side section is provided with a top platform for contacting the first force sensor, the long side section is provided with a threaded hole for connecting the first guide rail module, and the long side section is also provided with two bosses for fixing sample one.

[0013] Preferably, the second movable bracket is T-shaped, including a bottom plate and a vertical plate, the vertical plate is L-shaped and used to fix the second sample, the long side of the vertical plate is vertically connected to the bottom plate, and the bottom plate is provided with a threaded hole, which is used to connect the screw slider.

[0014] Preferably, the X-axis drive module includes a first linear motor module, which includes a first stator, a first mover, a second mover, a third mover, and a fourth mover, and the first mover, the second mover, the third mover, and the fourth mover are all horizontally slidably connected to the first stator, and the first mover, the second mover, the third mover, and the fourth mover are respectively provided with mounting tables; the Z-axis drive module includes a second servo electric push rod, a third servo electric push rod, a fourth servo electric push rod, and a fifth servo electric push rod, and the second servo electric push rod, the third servo electric push rod, the fourth servo electric push rod, and the fifth servo electric push rod are respectively fixed on the first mover, the second mover, the third mover, and the fourth mover through the mounting table, and the probe includes a first probe, a second probe, a third probe, and a fourth probe, and the first probe, the second probe, the third probe, and the fourth probe are respectively fixed on the second servo electric push rod, the third servo electric push rod, the fourth servo electric push rod, and the fifth servo electric push rod.

[0015] Preferably, the Y-axis drive module includes a third guide rail module and a second linear motor module. The third guide rail module and the second linear motor module are respectively arranged at the bottom of the left and right ends of the first stator, and are both perpendicular to the first stator. The third guide rail module includes a third guide rail and a third slider. The third guide rail is fixed on a fixed workbench, the third slider is slidably connected to the third guide rail, and the first stator is fixed on the third slider. The second linear motor module includes a second stator and a fifth mover. The second stator is fixed on a fixed workbench, the fifth mover is slidably connected to the second stator, and the first stator is fixed on the fifth mover.

[0016] Preferably, the electrical measurement system adopts a Lake Shore 2-channel synchronous source measurement system.

[0017] Preferably, the first slider, the second slider and the third slider are all rolling sliders.

[0018] The use of a rolling slider can minimize the impact on the accuracy of friction loading.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention realizes synchronous loading of positive pressure and friction force on two samples through the ingenious and reasonable design of the first movable bracket, the second movable bracket, the third movable bracket and the sample clamping bracket, and the magnitude of the positive pressure and friction force can be accurately controlled by the force sensor; the probe of the detection unit can move along the X-axis, Y-axis and Z-axis directions with the probe support, so that each position of the contact interface of the two samples can be detected, the probe is connected to the electrical measurement system, and the mechanical properties of the interface can be further detected by detecting the resistivity of the interface. The sliders in the present invention all adopt rolling sliders, which can reduce the influence on the accuracy of friction force loading. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention at a first viewing angle;

[0022] Figure 2 is a schematic diagram of the overall structure of an embodiment of the present invention at a second viewing angle;

[0023] Figure 3 is a schematic diagram of the overall structure of an embodiment of the present invention at a third viewing angle;

[0024] Figure 4 It is a partial exploded view of a compression shear force loading unit according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the first movable bracket according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the second movable bracket according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the third movable bracket according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of a sample clamping bracket according to an embodiment of the present invention;

[0029] Figure numerals: 1, fixed workbench; 2, compression shear force loading unit; 2-1, fixed bracket; 2-2, first movable bracket; 2-2-1, long side segment; 2-2-2, short side segment; 2-2-3, top platform; 2-2-4, boss; 2-3, second movable bracket; 2-3-1, bottom plate; 2-3-2, vertical plate; 2-4, third movable bracket; 2-4-1, protrusion; 2-5, first servo electric push rod; 2-6, bracket second drive module; 2-6-1, screw slider; 2-6-2, Screw rod; 2-6-3, servo motor; 2-7, first force sensor; 2-8, second force sensor; 2-9, third force sensor; 2-10, first guide rail module; 2-10-1, first guide rail; 2-10-2, first slider; 2-11, second guide rail module; 2-11-1, second guide rail; 2-11-2, second slider; 2-12, sample clamping bracket; 2-12-1, first crossbeam; 2-12-2, second crossbeam; 2-12-3, connecting rod; 2-12-4, top rod; 2-12-5, connecting hole; 2-12-6, pin hole; 2-13, top plate; 3, detection unit; 3-1, first linear motor module; 3-1-1, first stator; 3-1-2, first mover; 3-1-3, second mover; 3-1-4, third mover; 3-1-5, fourth mover; 3-1-6, first mounting platform; 3-1-7, second mounting platform; 3-1-8, third mounting platform; 3-1-9, fourth mounting platform; 3-1-10, second servo electric push rod; 3-1 -11, the third servo electric push rod; 3-1-12, the fourth servo electric push rod; 3-1-13, the fifth servo electric push rod; 3-2, the third guide rail module; 3-2-1, the third guide rail; 3-2-2, the third slider; 3-3, the second linear motor module; 3-3-1, the second stator; 3-3-2, the fifth mover; 3-4, the probe; 3-4-1, the first probe; 3-4-2, the second probe; 3-4-3, the third probe; 3-4-4, the fourth probe; 4, sample one; 5, sample two. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] 1. Device structure

[0032] like Figures 1 to 8 As shown, a device for detecting mechanical properties of an interface under complex loads comprises a fixed workbench 1 on which a compressive shear force loading unit 2 and a detection unit 3 are arranged.

[0033] Among them, the compressive shear force loading unit 2 includes a fixed bracket 2-1, a first movable bracket 2-2, a second movable bracket 2-3, a third movable bracket 2-4, a sample clamping bracket 2-12, a first servo electric push rod 2-5, a bracket two driving module 2-6, a first force sensor 2-7, a second force sensor 2-8, and a third force sensor 2-9. The first movable bracket 2-2 is used to fix sample one 4, and the second movable bracket 2-3 is used to fix sample two 5.

[0034] In this embodiment, the fixed workbench 1 is a stepped structure with three steps, the top step is used to fix the fixed bracket 2-1, the second step is used to fix the bracket second drive module 2-6, and the detection unit 3 is arranged on the bottom step; Figures 4 to 8 As shown, the fixed bracket 2-1 is a flat structure, and a threaded hole is provided on the side, and the threaded hole is used to connect and fix the first guide rail module 2-10 and the second guide rail module 2-11; the first movable bracket 2-2 is an L-shaped structure, including a long side section 2-2-1 and a short side section 2-2-2 that are perpendicular to each other, and a raised top platform 2-2-3 is provided on the side of the short side section 2-2-2, and the top platform 2-2-3 is used to touch the first force sensor 2-7, and a threaded hole is provided on the side of the long side section 2-2-1, and the threaded hole is used to connect the first guide rail module 2-10, and two bosses 2-2-4 are also provided on the side of the long side section 2-2-1, and the boss 2-2-4 and the short side section 2-2-2 are located on the same side, and the boss 2-2-4 is used to fix Sample one 4; the second movable bracket 2-3 is a T-shaped structure, including a bottom plate 2-3-1 and a vertical plate 2-3-2, the vertical plate 2-3-2 is an L-shaped structure for fixing sample two 5, the long side of the vertical plate 2-3-2 is vertically connected to the bottom plate 2-3-1, and the bottom plate 2-3-1 is provided with threaded holes, and the threaded holes are used to connect the bracket two drive module 2-6; the third movable bracket 2-4 is a flat plate structure, and vertical upward protrusions 2-4-1 are provided on both sides of the top of the flat plate, and the protrusions 2-4-1 are used to connect the sample clamping bracket 2-12, and the third movable bracket 2-4 is provided with threaded holes on the side, and the threaded holes are used to connect the first servo electric push rod 2-5 and the second slider 2-11-2 in the second guide rail module 2-11.

[0035] In this embodiment, if Figure 4As shown, the second movable bracket 2-3, the first movable bracket 2-2, the fixed bracket 2-1, and the third movable bracket 2-4 are sequentially arranged parallel to each other, and the heights of the brackets are similar. The fixed bracket 2-1 is fixed on the fixed workbench 1, one side of the fixed bracket 2-1 is connected to the first movable bracket 2-2 through the first guide rail module 2-10, and the other side of the fixed bracket 2-1 is connected to the third movable bracket 2-4 through the second guide rail module 2-11. The second movable bracket 2-3 is arranged on the other side of the first movable bracket 2-2 One side; wherein, the first guide rail module 2-10 includes a first guide rail 2-10-1 and a first slider 2-10-2, the first guide rail 2-10-1 is fixed on the fixed bracket 2-1, and the first slider 2-10-2 is fixed on the first movable bracket 2-2; the second guide rail module 2-11 includes a second guide rail 2-11-1 and a second slider 2-11-2, the second guide rail 2-11-1 is fixed on the fixed bracket 2-1, and the second slider 2-11-2 is fixed on the third movable bracket 2-4.

[0036] In this embodiment, the first slider 2-10-2 and the second slider 2-11-2 are both rolling sliders, which can reduce errors.

[0037] like Figures 1 to 3 As shown, the second step of the fixed workbench 1 is provided with a second drive module 2-6 of the bracket. The second drive module 2-6 of the bracket adopts a screw slider mechanism. The screw slider mechanism includes a screw slider 2-6-1, a screw 2-6-2, and a servo motor 2-6-3. The second movable bracket 2-3 is fixed on the screw slider 2-6-1. The screw slider 2-6-1 slides on the screw 2-6-2. The servo motor 2-6-3 is used to drive the screw 2-6-2, and the speed of the servo motor 2-6-3 is controllable.

[0038] A first servo electric push rod 2-5 is horizontally installed on the side of the third movable bracket 2-4, and the top end of the push rod of the first servo electric push rod 2-5 is connected to the sample clamping bracket 2-12. In this embodiment, the sample clamping bracket 2-12 includes a first beam 2-12-1, a second beam 2-12-2, a connecting rod 2-12-3, and a top rod 2-12-4. The first beam 2-12-1 is horizontally arranged on one side of the third movable bracket 2-4 and is parallel to the side of the third movable bracket 2-4. The second beam 2-12-2 is arranged on one side of the second movable bracket 2-3 and is parallel to the side of the second movable bracket 2-3. The two ends of the first beam 2-12-1 are connected to the two ends of the second beam 2-12-2 by the connecting rod 2-12-3 respectively, and the connecting rod 2-12-3 is arranged on the second movable bracket 2 -3 and above the third movable bracket 2-4, push rods 2-12-4 are vertically arranged at both ends of the second crossbeam 2-12-2; a connecting hole 2-12-5 and a pin hole 2-12-6 are arranged on the first crossbeam 2-12-1, the top end of the push rod of the first servo electric push rod 2-5 is inserted into the connecting hole 2-12-5, and is connected by a pin shaft passing through the pin hole 2-12-6, and the second force sensor 2-8 and the third force sensor 2-9 are respectively installed on the sides of the two push rods 2-12-4, and the second force sensor 2-8 and the third force sensor 2-9 are connected to the data collection device through wires for detecting the size of the positive pressure. When the first servo electric push rod 2-5 is extended, the two push rods 2-12-4 drive the second force sensor 2-8 and the third force sensor 2-9 to apply positive pressure to the sample 25.

[0039] The end of the fixed bracket 2-1 is vertically connected with a top plate 2-13, and the top plate 2-13 extends to the top platform 2-2-3 position on the side of the first movable bracket 2-2. A first force sensor 2-7 is installed on the top plate 2-13, and the first force sensor 2-7 is connected to a data collection device through a wire for detecting the magnitude of friction force.

[0040] In this embodiment, the detection unit 3 is arranged on one side of the second movable bracket 2-3, and the detection unit 3 includes a first linear motor 3-1, a third guide rail module 3-2, a second linear motor 3-3, and a probe 3-4, wherein the third guide rail module 3-2 and the second linear motor 3-3 are respectively vertically arranged at the bottom of the left and right ends of the first linear motor 3-1, and the third guide rail module 3-2 and the second linear motor 3-3 are arranged in parallel, and the first linear motor 3-1 can slide on the third guide rail module 3-2 and the second linear motor 3-3.

[0041] The first linear motor includes a first stator 3-1-1, a first mover 3-1-2, a second mover 3-1-3, a third mover 3-1-4, and a fourth mover 3-1-5. The first mover 3-1-2, the second mover 3-1-3, the third mover 3-1-4, and the fourth mover 3-1-5 can slide horizontally on the first stator 3-1-1. The first mover 3-1-2, the second mover 3-1-3, the third mover 3-1-4, and the fourth mover 3-1-5 are respectively fixed with a first mounting table 3-1-6, a second mounting table 3-1-7, a third mounting table 3-1-8, and a fourth mounting table 3-1-9. The first mounting table 3-1-6, the second mounting table 3-1-7, the third mounting table 3-1-8, and the fourth mounting table 3-1-9 are respectively provided with a second servo electric push rod 3-1-10, a third servo electric push rod 3-1-11, and a fourth servo electric push rod The first probe 3-4-1, the second probe 3-4-2, the third probe 3-4-3, and the fourth probe 3-4-4 are connected to the second servo electric push rod 3-1-10, the third servo electric push rod 3-1-11, the fourth servo electric push rod 3-1-12, and the fifth servo electric push rod 3-1-13 respectively. The first probe 3-4-1, the second probe 3-4-2, the third probe 3-4-3, and the fourth probe 3-4-4 are all perpendicular to the side of the second movable bracket 2-3, and insulating sleeves and insulating sleeves are provided at the connection between the first probe 3-4-1, the second probe 3-4-2, the third probe 3-4-3, the fourth probe 3-4-4 and the second servo electric push rod 3-1-10, the third servo electric push rod 3-1-11, the fourth servo electric push rod 3-1-12, and the fifth servo electric push rod 3-1-13.

[0042] The third guide rail module 3-2 includes a third guide rail 3-2-1 and a third slider 3-2-2. The third slider 3-2-2 is a rolling slider, which can reduce errors. The left end of the first stator 3-1-1 is fixed on the third slider 3-2-2. The second linear motor 3-3 includes a second stator 3-3-1 and a fifth mover 3-3-2. The second stator 3-3-1 is horizontally fixed on the fixed workbench 1. The fifth mover 3-3-2 is slidably connected to the second stator 3-3-1. The right end of the first stator 3-1-1 is fixed on the fifth mover 3-3-2.

[0043] In this embodiment, the electrical measurement system adopts a Lake Shore 2-channel synchronous source measurement system, and the ends of the first probe 3-4-1, the second probe 3-4-2, the third probe 3-4-3, and the fourth probe 3-4-4 are all connected to the Lake Shore 2-channel synchronous source measurement system through wires.

[0044] 2. Description of the device usage process or principle

[0045] like Figures 1 to 3As shown, when the present embodiment is used, the first servo electric push rod 2-5 drives the sample clamping bracket 2-12 to move, and the two push rods 2-12-4 of the sample clamping bracket 2-12 drive the second force sensor 2-8 and the third force sensor 2-9 to apply positive pressure to the sample 2 5. At the same time, the servo motor 2-6-3 in the screw slider mechanism drives the screw 2-6-2 to rotate, and the screw 2-6-2 drives the screw slider 2-6-1 to move toward the first force sensor 2-7. The second movable bracket 2-3 fixed on the screw slider 2-6-1 drives the sample 2 5 to move in the same direction. During the movement of the second movable bracket 2-3, the sample clamping bracket 2-12 drives the third movable bracket 2-4 to move with the second movable bracket 2-3, and the fixed bracket 2-1 is fixed, and the sample 1 4 is fixed on the first bracket 2-2. Under the action of friction, the first movable bracket 2-2 drives the sample 1 4 to move forward together. During this process, the second force sensor 2-8 and the third force sensor 2-9 monitor and display the relationship between the sample 1 4 and the sample 2 5, the first force sensor 2-7 monitors and displays the friction force of the contact interface between the sample 1 4 and the sample 2 5. When the positive pressure or friction force reaches the set value, the first servo electric push rod 2-5 or the servo motor 2-6-3 is turned off, and then the measurement and control unit 3 is started to detect the contact mechanical properties of the contact interface between the sample 1 4 and the sample 2 5. The first probe 3-4-1, the second probe 3-4-2, the third probe 3-4-3, and the fourth probe 3-4-4 in the detection unit 3 can all move along the X The four probes move in the directions of the X-axis, Y-axis and Z-axis. The X-axis direction can be understood as the direction indicated by the length of the first stator 3-1-1, the Y-axis direction can be understood as the direction indicated by the length of the third guide rail 3-2-1, and the Z-axis direction can be understood as the driving direction of the second servo electric push rod 3-1-10 or the third servo electric push rod 3-1-11 or the fourth servo electric push rod 3-1-12 or the fifth servo electric push rod 3-1-13. When the four probes are in contact with the surface of sample 2 5, the mechanical properties of the contact interface between sample 1 4 and sample 2 5 can be detected. It should be noted that, in the present invention, the probe detects the mechanical properties of sample 1 4 and sample 2 5 under the combined action of positive pressure and friction. The probe can detect the mechanical properties of the contact interface by contacting the non-contact interface of sample 1 4 and sample 2 5. The probe does not need to contact the contact interface. The contact interface is only used to generate friction. It is based on the principle of high-density electrical method. By changing the electrode spacing, the potential of the upper rough interface and the lower rough interface are measured twice, the contact resistance is calculated, and the mechanical properties of the contact interface are further obtained through calculation and analysis.

[0046] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for testing interface mechanical properties under complex loads, comprising a fixed workbench, characterized in that: The fixed workbench is provided with a compressive shear force loading unit and a detection unit; The compressive shear force loading unit includes a fixed bracket, a first movable bracket, and a second movable bracket which are arranged in parallel in sequence. The first movable bracket is used to fix sample one, and the second movable bracket is used to fix sample two. The fixed bracket is fixed on a fixed workbench. The first movable bracket is connected to the fixed bracket through a first guide rail module. The first guide rail module includes a first guide rail and a first slider. The first guide rail is fixed on the fixed bracket. The first slider is fixed on the first movable bracket. The first guide rail is slidably connected to the first slider. A bracket two driving module is arranged at the bottom of the second movable bracket. The bracket two driving module drives the second movable bracket to move horizontally in a tangential direction. The bracket two driving module is fixed on the fixed workbench. The end of the fixed bracket is vertically connected to a top plate, and a first force sensor is arranged on the top plate. The compressive shear force loading unit also includes a clamping module, which vertically squeezes the two side portions of the sample to apply positive pressure, and the clamping module includes a third movable bracket, a first servo electric push rod, and a sample clamping bracket. The third movable bracket is connected to the fixed bracket through a second guide rail module, and the second guide rail module includes a second guide rail and a second slider. The second guide rail is fixed on the fixed bracket, and the second slider is fixed on the third movable bracket. The second guide rail is slidably connected to the second slider, and the other side of the third movable bracket is vertically connected to the first servo electric push rod, and the first servo electric push rod is connected to the sample clamping bracket. One end of the sample clamping bracket extends to the side portion of the second movable bracket, and the second force sensor and the third force sensor are arranged at one end of the sample clamping bracket extending to the side portion of the second movable bracket; The detection unit includes a probe and a probe holder. The probe holder drives the probe to move along the X-axis, Y-axis and Z-axis directions. The probe holder includes an X-axis drive module, a Y-axis drive module and a Z-axis drive module. The probe is fixed on the Z-axis drive module and points vertically to sample 2. The end of the probe is connected to an electrical measurement system through a wire.

2. The device for detecting mechanical properties of interfaces under complex loads according to claim 1, characterized in that: The second bracket driving module adopts a screw slider mechanism, which includes a screw slider, a screw, and a servo motor. The second movable bracket is fixed on the screw slider, the screw slider is slidably connected to the screw, and the servo motor drives the screw to rotate.

3. The device for detecting mechanical properties of interfaces under complex loads according to claim 2, characterized in that: The sample clamping bracket includes a first crossbeam, a second crossbeam, a connecting rod, and a push rod. The first crossbeam is horizontally arranged at one side of the third movable bracket and is parallel to the third movable bracket. The second crossbeam is arranged at the side of the second movable bracket and is parallel to the second movable bracket. The two ends of the first crossbeam and the two ends of the second crossbeam are respectively fixedly connected by connecting rods, and the connecting rods are arranged above the second movable bracket and the third movable bracket. Push rods are respectively arranged vertically downward at the two ends of the second crossbeam; the second force sensor and the third force sensor are respectively arranged on the sides of the push rods.

4. The device for detecting mechanical properties of interfaces under complex loads according to claim 3 is characterized in that: The first movable bracket is L-shaped, including a long side section and a short side section. The short side section is provided with a top platform for contacting the first force sensor, and the long side section is provided with a threaded hole for connecting the first guide rail module and two bosses for fixing sample one.

5. The device for detecting mechanical properties of interfaces under complex loads according to claim 4, characterized in that: The second movable bracket is T-shaped, including a bottom plate and a vertical plate. The vertical plate is L-shaped and used to fix the second sample. The long side of the vertical plate is vertically connected to the bottom plate. The bottom plate is provided with a threaded hole, which is used to connect the screw slider.

6. The device for detecting mechanical properties of interfaces under complex loads according to claim 1, characterized in that: The X-axis drive module includes a first linear motor module, which includes a first stator, a first mover, a second mover, a third mover, and a fourth mover. The first mover, the second mover, the third mover, and the fourth mover are all horizontally slidably connected to the first stator, and the first mover, the second mover, the third mover, and the fourth mover are respectively provided with mounting tables; the Z-axis drive module includes a second servo electric push rod, a third servo electric push rod, a fourth servo electric push rod, and a fifth servo electric push rod. The second servo electric push rod, the third servo electric push rod, the fourth servo electric push rod, and the fifth servo electric push rod are respectively fixed on the first mover, the second mover, the third mover, and the fourth mover through the mounting table. The probe includes a first probe, a second probe, a third probe, and a fourth probe. The first probe, the second probe, the third probe, and the fourth probe are respectively fixed on the second servo electric push rod, the third servo electric push rod, the fourth servo electric push rod, and the fifth servo electric push rod.

7. The device for detecting mechanical properties of interfaces under complex loads according to claim 6, characterized in that: The Y-axis drive module includes a third guide rail module and a second linear motor module. The third guide rail module and the second linear motor module are respectively arranged at the bottom of the left and right ends of the first stator, and are both perpendicular to the first stator. The third guide rail module includes a third guide rail and a third slider. The third guide rail is fixed on a fixed workbench. The third slider is slidably connected to the third guide rail. The first stator is fixed on the third slider. The second linear motor module includes a second stator and a fifth mover. The second stator is fixed on a fixed workbench. The fifth mover is slidably connected to the second stator. The first stator is fixed on the fifth mover.

8. The device for detecting mechanical properties of interfaces under complex loads according to claim 1, characterized in that: The electrical measurement system adopts Lake Shore 2-channel synchronous source measurement system.

9. The device for testing interface mechanical properties under complex loads according to claim 6, characterized in that: The first slider, the second slider and the third slider are all rolling sliders.

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