A fatigue resistance testing device for nickel titanium memory alloy additive manufacturing

Abstract

The present application belongs to the technical field of nickel-titanium memory alloy fatigue resistance testing, in particular to a nickel-titanium memory alloy additive manufacturing fatigue resistance testing device. The following scheme is proposed, including a test base and a clamp assembly. The clamp assembly is provided with two fixed clamps and two movable clamps. The movable clamps and the fixed clamps can move horizontally between the two sides. The movable clamps are connected with a moving assembly. The moving assembly is connected with the movable clamps through magnetic attraction. The movable clamps can move horizontally between the two ends through the moving assembly. The test base top is provided with a pressure sensor corresponding to the position of the movable clamps. The fixed clamps and the movable clamps arranged at four positions, the disconnection mode of the magnetic attraction of the moving assembly, and the pressure sensor detect and record the change of the impact force and the time period of the nickel-titanium memory alloy additive in the rebound reciprocation, so as to improve the accuracy of the actual test and improve the work efficiency.

Description

Technical Field

[0001] This invention relates to the field of fatigue resistance testing technology for nickel-titanium shape memory alloys, and more particularly to a fatigue resistance testing device for additive manufacturing of nickel-titanium shape memory alloys. Background Technology

[0002] Nickel-titanium alloy is a type of shape memory alloy. Shape memory alloys are special alloys that can automatically recover their original shape after plastic deformation at a specific temperature. They have good plasticity. Additive manufacturing (AM) is a type of precision manufacturing technology that has emerged in recent years and uses computer-aided manufacturing. It is carried out by melting or powder spraying. After nickel-titanium shape memory alloy is additively manufactured, it is often necessary to take samples for fatigue resistance testing.

[0003] Existing technologies typically test the fatigue resistance of nickel-titanium shape memory alloy additives by fixing both ends of the additive and repeatedly stretching and contracting it until it breaks. However, for wide sheet-like nickel-titanium shape memory alloy additives, fixing only the two ends can easily lead to uneven force application during stretching due to the large width, affecting the accuracy of the actual test. Furthermore, the fact that the test is usually conducted by using external force to repeatedly stretch and recover the additive also affects the accuracy of the actual test. Summary of the Invention

[0004] Based on the technical problems in the background art, the present invention proposes a fatigue resistance testing device for additive manufacturing of nickel-titanium shape memory alloys.

[0005] This invention proposes a fatigue resistance testing device for additive manufacturing of nickel-titanium shape memory alloy, comprising a test base and a clamp assembly. The clamp assembly is provided with two fixed clamps and two movable clamps, both of which can move horizontally between their sides. The movable clamps are connected to a movable component, which is magnetically connected to the movable clamps, allowing the movable clamps to move horizontally between their ends via the movable component. A pressure sensor is disposed on the top of the test base at a position corresponding to the movable clamps.

[0006] Preferably, a first slide groove is formed at the top of the test base corresponding to the position of the movable clamp, and a second slide groove is formed at the bottom of the first slide groove. A first slider is slidably connected to the inner wall of the first slide groove. The bottom of the movable clamp is fixedly connected to the top of the first slider. A threaded rod is rotatably connected between the inner walls of the two ends of the second slide groove. A motor is drivenly connected to one end of the threaded rod. A second slider is threadedly connected to the outer wall of the threaded rod. The outer wall of the second slider is slidably connected to the inner walls of the first and second slide grooves. An electromagnetic block is fixed to the side wall of the second slider facing the first slider. When the electromagnetic block is energized, it magnetically attracts the first slider.

[0007] Preferably, both the fixed clamp and the movable clamp are provided with an electric guide rail, a base plate and a pressure plate; the electric guide rail is arranged perpendicular to the moving direction of the movable component, and is connected to the base plate; a vertically upward extending mounting bracket is fixed to the top of the base plate, and a cylinder is fixed between the top of the mounting bracket and the pressure plate.

[0008] Preferably, a fixed partition is fixed to the bottom of the pressure plate near the side of the nickel-titanium shape memory alloy additive manufacturing, a rotating block is rotatably arranged at the center of the pressure plate, a second motor is connected to the top of the rotating block, and a movable partition is fixed to the bottom of the rotating block.

[0009] Preferably, the movable partition has multiple spring pieces fixed to the side facing the nickel-titanium shape memory alloy additive manufacturing process. The spring pieces have an outwardly arched arc structure, and a gap hole penetrating in the vertical direction is provided between the spring pieces and the movable partition.

[0010] Preferably, the movable partition has a filling cavity inside, an airbag is fixedly installed in the filling cavity, and a plurality of through slots corresponding to the position of the spring are opened on the side wall of the filling cavity facing the spring. A connecting rod is fixed to the side of the spring facing the airbag, and a pressing member is fixed to one end of the connecting rod and slidably connected to the inner wall of the through slot.

[0011] Preferably, multiple contact blocks are fixed at the top of the base plate and the bottom of the pressure plate near the nickel-titanium shape memory alloy additive manufacturing location. The contact blocks are made of silicone material, and the sidewalls of the contact blocks facing the nickel-titanium shape memory alloy additive manufacturing location have gap grooves. The top of the contact blocks is set to tilt downwards away from the center of the base plate.

[0012] Preferably, a mounting box and a movable box are provided at the top of the test base corresponding to the pressure sensor. The mounting box is fixed near the fixing fixture, and the outer wall of the movable box slides in contact with the inner wall of the mounting box. The pressure sensor is fixed at the end of the movable box away from the mounting box. The top of the movable box has mounting holes distributed at equal intervals, and the top of the mounting box away from the fixing fixture has an auxiliary hole. The inner walls of the mounting holes and the auxiliary hole are threaded with the same mounting bolt.

[0013] Preferably, the top of the mounting box has equidistantly distributed air holes, which are elliptical in shape extending toward the end. An elastic strip is fixed between the inner walls of the two ends of the air hole. Both sides of the mounting box have equidistantly distributed air grooves, which are spaced apart from the air holes. The air grooves are arc-shaped with the middle part arching downward.

[0014] Preferably, the top of the movable box has equidistantly distributed air holes II, which are elliptical in shape extending to both sides. The air holes II are spaced apart from the mounting holes. The inner wall of the air holes II is fixed with vertically extending elastic sheets, and adjacent elastic sheets are inclined in opposite directions. Multiple vertically arranged air slots II are provided on both sides of the movable box.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. In this embodiment of the invention, the uniformity of force applied across the width during the stretching process of nickel-titanium shape memory alloy additives is ensured by using fixed clamps and movable clamps at the four corners. The magnetic disconnection method of the movable component avoids the need to always use mechanical force to stretch and recover the additives, which would affect the accuracy of the test. Furthermore, the combination of pressure sensors and a computer detects and records the changes in impact force and time period of the nickel-titanium shape memory alloy additives during springback, thereby improving the accuracy of the actual test, reducing working time, and improving work efficiency.

[0017] 2. In this embodiment of the invention, the movable partition is rotated to clamp and fix the nickel-titanium shape memory alloy additive from the side. The inclined movable partition increases the stability and firmness of the nickel-titanium shape memory alloy additive in the direction between the two ends. In conjunction with the spring and airbag on the side wall of the movable partition, when the spring near the rotating block is squeezed, it exerts a counterforce with the bulging airbag, thereby further improving the stability and anti-loosening effect of clamping and fixing the nickel-titanium shape memory alloy additive.

[0018] 3. In this embodiment of the invention, the opposing rebound forces of the contact blocks on the fixed clamps and the movable clamps at both ends are used to improve the stability and firmness of clamping and fixing the nickel-titanium shape memory alloy additive, further preventing the nickel-titanium shape memory alloy additive from loosening, and further improving the accuracy of actual fatigue resistance testing.

[0019] 4. In this embodiment of the invention, by setting up the mounting box and the moving box, the airflow inside and outside the moving box and the mounting box is improved, thereby further improving the air circulation and heat dissipation effect on the position below the meshing shape memory alloy additive, so as to avoid heat accumulation and affect the accuracy of the test. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention.

[0021] Figure 2 This is a schematic diagram of the top structure of the test base of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing, as proposed in this invention.

[0022] Figure 3This is a schematic diagram of the moving mechanism of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention.

[0023] Figure 4 This is a schematic diagram of slide 1 and slide 2 of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention.

[0024] Figure 5 This is a schematic diagram of the base plate and pressure plate structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention;

[0025] Figure 6 This is a schematic diagram of the base plate structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention;

[0026] Figure 7 This is a schematic diagram of the contact block structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention;

[0027] Figure 8 This is a schematic diagram of the bottom structure of the pressure plate of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention;

[0028] Figure 9 This is a schematic diagram of the moving partition structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention.

[0029] Figure 10 This is a schematic diagram of the connecting rod and extrusion structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention;

[0030] Figure 11 This is a schematic diagram of the mounting box and moving box structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention.

[0031] Figure 12 This is a schematic diagram of the moving box structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention;

[0032] Figure 13 This is a schematic diagram of the elastic sheet distribution structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention;

[0033] Figure 14 This is a schematic diagram of the mounting box structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention;

[0034] Figure 15 This is a schematic diagram of the elastic strip structure of a fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing proposed in this invention.

[0035] In the diagram: 1 Test base, 2 Fixture assembly, 201 Fixed fixture, 202 Moving fixture, 3 Nickel-titanium shape memory alloy additive manufacturing, 4 Moving component, 5 Pressure sensor, 6 Slide 1, 7 Slide 2, 8 Limiting strip, 9 Slider 1, 10 Slider 2, 11 Threaded rod, 12 Motor 1, 13 Electromagnetic block, 14 Electric guide rail, 15 Slider 3, 16 Fixing bolt, 17 Base plate, 18 Pressure plate, 19 Mounting bracket, 20 Cylinder, 21 Perforation, 22 Fixed partition, 23 Rotating block, 24 Motor 2, 25 Moving partition, 26 Spring, 27 Airbag, 28 Connecting rod, 29 Extrusion piece, 30 Contact block, 31 Gap groove, 32 Mounting box, 33 Moving box, 34 Mounting hole, 35 Mounting bolt, 36 Air hole 1, 37 Air groove 1, 38 Elastic strip, 39 Air hole 2, 40 Elastic sheet, 41 Air groove 2. Detailed Implementation

[0036] Example 1

[0037] Reference Figures 1-2 A fatigue resistance testing device for additive manufacturing of nickel-titanium shape memory alloy includes a test base 1 and a clamp assembly 2. A nickel-titanium shape memory alloy additive 3 is placed and fixed on the test base 1 via the clamp assembly 2. The clamp assembly 2 has two fixed clamps 201 and two movable clamps 202. The two fixed clamps 201 are located at the same end of the test base 1, and the two movable clamps 202 are also located at the same end of the test base 1. Both the movable clamps 202 and the fixed clamps 201 can move horizontally between their respective sides. A movable component 4 is connected to each movable clamp 202, and the movable component 4 is magnetically connected to the movable clamp 202. The movable clamp 202 can move between its two ends via the movable component 4. Horizontal movement; A pressure sensor 5 is set at the position corresponding to the moving clamp 202 on the top of the test base 1. The pressure sensor 5 is set between the fixed clamp 201 and the moving clamp 202. The pressure sensor 5 is connected to the computer through a signal line. In actual use, the distance between the two fixed clamps 201 and the distance between the two moving clamps 202 are adjusted by moving them horizontally between the two sides. Then, the distance between the moving clamp 202 and the fixed clamp 201 is adjusted by moving them horizontally between the two ends, so that the four corners of the sheet-like nickel-titanium shape memory alloy additive are clamped and fixed on the two fixed clamps 201 and the two moving clamps 202 respectively.

[0038] During testing, the moving component 4 and the moving clamp 202 are magnetically attracted, and the moving component 4 pulls one end of the nickel-titanium shape memory alloy additive 3 horizontally between its two ends, causing the nickel-titanium shape memory alloy additive 3 to extend. After stretching a certain distance, the magnetic attraction is disconnected, allowing the nickel-titanium shape memory alloy additive 3 to recover according to its own elasticity and move horizontally back and forth a certain distance. The moving clamp 202 at the recovered position impacts the pressure sensor 5 at the corresponding position, recording the time period of the reciprocating motion of the moving clamp 202 and the change in impact force. Within a certain period of time, the moving component 4 is used to magnetically attract the moving clamp 202 again, stretching it to a predetermined length, and the test is repeated multiple times. By calculating the changes in data from multiple tests, inferences can be made. The fatigue resistance of the nickel-titanium shape memory alloy additive 3 is ensured by the uniform force applied across the width during the stretching process of the nickel-titanium shape memory alloy additive 3 through the fixed clamps 201 and the movable clamps 202 set at the four corners, thus avoiding deformation across the width caused by stretching at a single point and affecting the accuracy of the test. The magnetic disconnection of the movable component 4 allows the nickel-titanium shape memory alloy additive 3 to return to its position and reciprocate under its own elastic force, thus avoiding the need to use mechanical force to stretch and return the additive, which would affect the accuracy of the test. Furthermore, the pressure sensor 5 and the computer work together to detect and record the changes in impact force and time period of the nickel-titanium shape memory alloy additive 3 during the rebound and reciprocation, thereby improving the accuracy of the actual test, reducing working time, and improving work efficiency.

[0039] In this invention, reference is made to Figures 3-4 A slide groove 6 is provided at the top of the test base 1, corresponding to the position of the movable clamp 202. The slide groove 6 extends between its two ends. A parallel slide groove 7 is provided at the bottom of the slide groove 6. A slider 9 is slidably connected to the inner wall of the slide groove 6. The bottom of the movable clamp 202 is fixedly connected to the top of the slider 9. Limit strips 8 are fixed to the top of both sides of the slide groove 6. A threaded rod 11 is rotatably connected between the inner walls of the two ends of the slide groove 7. A motor 12 is drivenly connected to one end of the threaded rod 11. A slider 10 is threadedly connected to the outer wall of the threaded rod 11. The outer wall of the slider 10 is slidably connected to the inner walls of the slide groove 6 and the slide groove 7. The slider 10 faces... An electromagnetic block 13 is fixed to the side wall of slider 9. When the electromagnetic block 13 is energized, it magnetically attracts slider 9. In actual use, it is fixed to slider 9 by moving clamp 202, and the position of moving clamp 202 between the two ends is adjusted along slide groove 6 to fix the additive. During testing, the electromagnetic block 13 is energized and magnetically fixed to slider 9. Then, the moving distance of slider 9 and moving clamp 202 is precisely adjusted by rotating threaded rod 11 to determine the stretching distance of the additive. Then, the power supply to the electromagnetic block 13 is turned off for testing. After a certain period of time, slider 10 is moved to the predetermined position and the electromagnetic block 13 is used to attract slider 9 again for multiple tests.

[0040] In this invention, reference is made to Figure 2 , Figure 5 , Figure 6 and Figure 8 Both the fixed clamp 201 and the movable clamp 202 are equipped with an electric guide rail 14, a base plate 17, and a pressure plate 18. The bottom of the electric guide rail 14 slides in contact with the top of the test base 1, and the end of the electric guide rail 14 contacts the pressure sensor 5. The electric guide rail 14 is perpendicular to the moving direction of the moving component 4. The electric guide rail 14 on the fixed clamp 201 is directly fixed to the top of the test base 1, and the electric guide rail 14 on the movable clamp 202 is fixed to the slider 9. A movable slider 1 is provided on the electric guide rail 14. 5. A fixing bolt 16 is connected between the top of the slider 3 15 and the base plate 17; a vertically upward extending mounting bracket 19 is fixed to the top of the base plate 17; a through hole 21 is opened at the position corresponding to the mounting bracket 19 on the top of the pressure plate 18; a cylinder 20 is fixed between the top of the mounting bracket 19 and the pressure plate 18 to place the nickel-titanium shape memory alloy additive 3 between the base plate 17 and the pressure plate 18; the pressure plate 18 is lowered by the cylinder 20; and the nickel-titanium shape memory alloy additive 3 is clamped and fixed by the pressed base plate 17 and the pressure plate 18.

[0041] Example 2

[0042] Based on Example 1, referring to Figure 8 A fatigue resistance testing device for nickel-titanium shape memory alloy additive manufacturing is disclosed. A fixed partition 22 is fixed to the bottom of a pressure plate 18 near the nickel-titanium shape memory alloy additive 3. The fixed partition 22 extends to a position near the center of the pressure plate 18. A rotating block 23 is rotatably mounted at the center of the pressure plate 18. A motor 24 is connected to the top of the rotating block 23. A movable partition 25 is fixed to the bottom of the rotating block 23 away from the nickel-titanium shape memory alloy additive 3. In actual use, when placing the nickel-titanium shape memory alloy additive 3, the sheet-like nickel-titanium shape memory alloy is... The two ends of the alloy additive 3 are placed against the fixed partition 22. Then, the cylinder 20 lowers the pressure plate 18 to clamp and fix the nickel-titanium memory alloy additive 3. Then, the motor 24 rotates the rotating block 23 and the moving partition 25, so that the moving partition 25 rotates and clamps and fixes the nickel-titanium memory alloy additive 3 from the side. The inclined moving partition 25 increases the stability and firmness of the nickel-titanium memory alloy additive 3 between the two ends, thus ensuring the stability of the nickel-titanium memory alloy additive 3 during the tensile test.

[0043] In this invention, reference is made to Figure 9Multiple spring pieces 26 are fixed to the side of the movable partition 25 facing the nickel-titanium shape memory alloy additive 3. The spring pieces 26 have an outwardly arched arc structure. A gap hole penetrating in the vertical direction is provided between the spring pieces 26 and the movable partition 25. When the nickel-titanium shape memory alloy additive 3 is clamped and fixed by rotating the movable partition 25, the spring pieces 26 bend when squeezed and the corner of the nickel-titanium shape memory alloy is partially bent and fits with the bent part of the spring piece 26. This improves the stability of the clamping and fixing of the nickel-titanium shape memory alloy additive 3 by the actual clamping assembly 2 and avoids loosening during reciprocating stretching.

[0044] In this invention, reference is made to Figure 10 The movable partition 25 has a filling cavity inside, and an airbag 27 is fixedly installed in the filling cavity. The side wall of the filling cavity facing the spring piece 26 has multiple through slots corresponding to the position of the spring piece 26. A connecting rod 28 is fixed to the side of the spring piece 26 facing the airbag 27. One end of the connecting rod 28 is fixed to a pressing member 29 that is slidably connected to the inner wall of the through slot. In the actual process of clamping and fixing the nickel-titanium shape memory alloy additive 3, the spring piece 26, which is away from the rotating block 23, will first contact the nickel-titanium shape memory alloy additive 3 for clamping and fixing. The airbag 27 is first squeezed from the end away from the rotating block 23 by the connecting rod 28 and the pressing member 29 fixed to the spring piece 26. The airbag 27 inflates towards the position close to the rotating block 23. When the spring piece 26, which is close to the rotating block 23, is squeezed, it exerts a counterforce with the inflated airbag 27 to further improve the stability of clamping and fixing the nickel-titanium shape memory alloy additive 3 and the anti-loosening effect.

[0045] Example 3

[0046] Based on Example 1 or Example 2, refer to Figure 7 A fatigue resistance testing device for nickel-titanium shape memory alloy additive manufacturing is disclosed. Multiple spaced contact blocks 30 are fixed at the top of a base plate 17 and the bottom of a pressure plate 18 near the nickel-titanium shape memory alloy additive 3. The contact blocks 30 are made of silicone material. A gap groove 31 is formed on the sidewall of each contact block facing the nickel-titanium shape memory alloy additive 3. The top of each contact block 30 is angled downwards away from the center of the base plate 17. When the nickel-titanium shape memory alloy additive 3 is clamped and fixed using the base plate 17 and pressure plate 18, the contact blocks 30 are compressed during contact with the additive 3, causing the top of the contact blocks 30 to be pressed down and adhered to the gap groove 31. The opposing rebound forces of the contact blocks 30 on the fixed clamp 201 and the movable clamp 202 at both ends improve the stability and firmness of the clamping and fixing of the nickel-titanium shape memory alloy additive 3, further preventing the additive 3 from loosening and thus improving the accuracy of the actual fatigue resistance test.

[0047] Example 4

[0048] Based on the above embodiments, referring to Figures 11-12 A fatigue resistance testing device made of nickel-titanium shape memory alloy additive manufacturing is disclosed. The test base 1 has a mounting box 32 and a movable box 33 positioned at the top corresponding to the pressure sensor 5. Both the mounting box 32 and the movable box 33 extend at both ends. The mounting box 32 is fixed near the fixing fixture 201, with one end of the mounting box 32 opening towards the movable fixture 202. The outer wall of the movable box 33 slides in contact with the inner wall of the mounting box 32. The pressure sensor 5 is fixed at the end of the movable box 33 away from the mounting box 32. The top of the movable box 33 has evenly spaced mounting holes 34. The top end of the mounting box 32 away from the fixing fixture 201 has an auxiliary hole. The inner walls of the mounting holes 34 and the auxiliary hole are threaded with the same mounting bolt 35. The distance between the pressure sensor 5 and the movable fixture 202 can be adjusted by threading the mounting bolt 35 to the mounting holes 34 at different positions.

[0049] In this invention, reference is made to Figures 14-15 The top of the mounting box 32 has equidistantly distributed air vents 36, which are elliptical in shape extending towards the ends. An elastic strip 38 is fixed between the inner walls of the two ends of the air vents 36. Both sides of the mounting box 32 have equidistantly distributed air grooves 37, which are spaced apart from the air vents 36. The air grooves 37 are arc-shaped with the middle part arched downwards. When the pressure sensor 5 is reciprocated by the rebounding moving clamp 202, it causes the moving box 33 and the mounting box 32 to vibrate mechanically. The vertical vibration of the elastic strip 38, along with the spaced air vents 36 and air grooves 37, improves the airflow and heat dissipation effect at the bottom of the nickel-titanium shape memory alloy additive 3, thus avoiding heat accumulation at the bottom during the reciprocating stretching test of the nickel-titanium shape memory alloy additive 3, which would affect the accuracy of the test.

[0050] In this invention, reference is made to Figures 12-13The top of the movable box 33 has equidistantly distributed air vents 39, which are elliptical in shape extending to both sides. The air vents 39 and the mounting holes 34 are spaced apart. The inner wall of the air vents 39 is fixed with vertically extending elastic plates 40, and adjacent elastic plates 40 are inclined in opposite directions. Multiple vertically arranged air grooves 41 are provided on both sides of the movable box 33. When the pressure sensor 5 is subjected to reciprocating impact force and the mechanical vibration is transmitted to the movable box 33, the elastic plates 40 increase the airflow in the inner chambers of the movable box 33 and the mounting box 32. The vertical extension of the air vents 36 and 39, combined with the staggered arrangement of the air grooves 37 and 41, improves the airflow inside and outside the movable box 33 and the mounting box 32, thereby further improving the air circulation and heat dissipation effect below the meshing shape memory alloy additive 3, so as to avoid heat accumulation and affect the accuracy of the test.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fatigue resistance testing device for additive manufacturing of nickel-titanium memory alloys, comprising a test base (1) and a clamp assembly (2), characterized in that, The clamp assembly (2) is provided with two fixed clamps (201) and two movable clamps (202), and the movable clamps (202) and the fixed clamps (201) can move horizontally between two sides; The movable clamp (202) is connected with a moving assembly (4), and the moving assembly (4) and the movable clamp (202) are connected through magnetic attraction, and the movable clamp (202) can move horizontally between two ends through the moving assembly (4); The top of the test base (1) is provided with a pressure sensor (5) at the position corresponding to the movable clamp (202), the movable clamp (202) is stretched through the magnetic attraction of the moving assembly (4) and the movable clamp (202), then the magnetic attraction is disconnected after stretching a certain distance, so that the nickel-titanium memory alloy additive (3) is recovered and horizontally reciprocated a certain distance according to its own elastic force, the movable clamp (202) at the recovery position impacts on the pressure sensor (5) at the corresponding position, so as to record the time period and impact force change of the reciprocating movement of the movable clamp (202); The top of the test base (1) is provided with a sliding groove one (6) at the position corresponding to the movable clamp (202), the bottom of the sliding groove one (6) is provided with a sliding groove two (7), the inner wall of the sliding groove one (6) is slidably connected with a sliding block one (9), the bottom of the movable clamp (202) is fixedly connected with the top of the sliding block one (9), the both ends of the inner wall of the sliding groove two (7) are rotatably connected with a threaded rod (11), one end of the threaded rod (11) is drivingly connected with a motor one (12), the outer wall of the threaded rod (11) is threadedly connected with a sliding block two (10), the outer wall of the sliding block two (10) is slidably connected with the inner wall of the sliding groove one (6) and the sliding groove two (7), the side wall of the sliding block two (10) facing the sliding block one (9) is fixedly connected with an electromagnetic block (13), and the electromagnetic block (13) is magnetically attracted to the sliding block one (9) when electrified.

2. The fatigue resistance testing device of claim 1, wherein, The fixed clamp (201) and the movable clamp (202) are provided with an electric guide rail (14), a bottom plate (17) and a pressing plate (18); The electric guide rail (14) is arranged vertically to the moving direction of the moving assembly (4), and the electric guide rail (14) is provided with a movable sliding block three (15), and the top of the sliding block three (15) is connected with the bottom plate (17) through a fixing bolt (16); The top of the bottom plate (17) is fixedly connected with a mounting bracket (19) extending vertically upward, and the top of the mounting bracket (19) is fixedly connected with a cylinder (20) and the pressing plate (18).

3. The fatigue resistance testing device of claim 2, wherein, The bottom of the pressing plate (18) is fixedly connected with a fixed partition plate (22) close to the nickel-titanium memory alloy additive (3), a rotating block (23) is rotatably arranged at the center position of the pressing plate (18), the top of the rotating block (23) is connected with a motor two (24), and the bottom of the rotating block (23) is fixedly connected with a movable partition plate (25).

4. The fatigue resistance testing device of claim 3, wherein, The mobile partition (25) is fixed with a plurality of elastic sheets (26) towards the side of the nickel-titanium memory alloy additive (3), the elastic sheet (26) is an outwardly arched structure, and a gap hole penetrating in the vertical direction is arranged between the elastic sheet (26) and the mobile partition (25).

5. The fatigue resistance testing device of claim 4, wherein the nickel-titanium memory alloy is a nickel-titanium alloy having a nickel content of 55-65 atomic percent. The inside of the mobile partition (25) is provided with a filling cavity, the gas bag (27) is fixedly installed in the filling cavity, a plurality of through slots corresponding to the positions of the elastic sheet (26) are formed in the side wall of the filling cavity facing the elastic sheet (26), the connecting rod (28) is fixed to one side of the elastic sheet (26) facing the gas bag (27), and one end of the connecting rod (28) is fixed with the extrusion piece (29) in sliding connection with the inner wall of the through slot.

6. The fatigue resistance testing device of claim 2, wherein, A plurality of contact blocks (30) are fixed to the top of the bottom plate (17) and the bottom of the pressing plate (18) near the position of the nickel-titanium memory alloy additive (3), the contact block (30) is made of silica gel material, the side wall of the contact block (30) facing the nickel-titanium memory alloy additive (3) is provided with a gap slot (31), and the top of the contact block (30) is inclined downward away from the center position of the bottom plate (17).

7. The fatigue resistance testing device of claim 1, wherein, The top of the test base (1) is provided with a mounting box (32) and a moving box (33) corresponding to the position of the pressure sensor (5), the mounting box (32) is fixed to the position close to the fixed clamp (201), the outer wall of the moving box (33) is in sliding contact with the inner wall of the mounting box (32), and the pressure sensor (5) is fixed to the end position of the moving box (33) away from the mounting box (32). The top of the moving box (33) is provided with equidistantly distributed mounting holes (34), the end of the top of the mounting box (32) away from the fixed clamp (201) is provided with an auxiliary hole, and the inner walls of the mounting hole (34) and the auxiliary hole are threadedly connected with the same mounting bolt (35).

8. The fatigue resistance testing device of claim 7, wherein the nickel-titanium memory alloy is a nickel-titanium alloy having a nickel content of 55-65 atomic percent. The top of the mounting box (32) is provided with equidistantly distributed air holes (36), the air holes (36) are arranged in an elliptical structure extending towards the end, the elastic strips (38) are fixed between the inner walls of the two ends of the air holes (36), equidistantly distributed air grooves (37) are formed in the two sides of the mounting box (32), the air grooves (37) are arranged in an arc structure with the middle position arched downward, and the air grooves (37) are arranged in an interval distribution mode with the air holes (36).

9. The fatigue resistance testing device of claim 7, wherein, The top of the moving box (33) is provided with equidistantly distributed air holes (39), the air holes (39) are arranged in an elliptical structure extending towards the two sides, the air holes (39) are arranged in an interval distribution mode with the mounting holes (34), the inner walls of the air holes (39) are fixed with vertically extending elastic sheets (40), and the adjacent two elastic sheets (40) are arranged in an opposite inclined mode, and a plurality of vertically arranged air grooves (41) are formed in the two sides of the moving box (33).

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