A device and method for testing dynamic fatigue performance of thermoplastic elastomer

Abstract

The present invention discloses a device and method for testing the dynamic fatigue performance of a thermoplastic elastomer, belonging to the technical field of elastomer material testing. The device and method comprise: a test frame, the external assembly of which is provided with a transparent partition, the transparent partition sealing the test frame to form an experimental sealed chamber; loading units symmetrically distributed on the test frame and located in the experimental sealed chamber, with an elastic material connected between two loading units; a temperature sensor installed on the inner wall of the transparent partition; and a control mechanism horizontally fixed in the experimental sealed chamber of the test frame. The present invention mainly utilizes the loading unit to provide dynamic tensile stress to the elastic material, and an industrial camera records the entire fatigue fracture process. A steel knife mechanism can utilize a steel knife holder to pre-form a cut on the surface of the elastic material, so that fatigue damage is formed at a single point or multiple points in the middle of the elastic material, thereby significantly shortening the time required for the entire fatigue fracture process and improving the test efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of elastomer material testing, and in particular relates to a device and method for testing the dynamic fatigue performance of a thermoplastic elastomer. Background Art

[0002] Thermoplastic elastomers have good elasticity and plasticity and are widely used in the automotive, electronics, medical and other industries. Traditionally, fatigue testing of thermoplastic elastomers requires a long time to observe obvious crack propagation and fracture phenomena. This is especially true for thermoplastic elastomers, as their high toughness requires a long test cycle, which affects experimental efficiency. In addition, in existing technologies, the fatigue fracture location of elastic materials is often difficult to control manually, resulting in randomness in the generation of fracture surfaces, low repeatability of experimental results, and an inability to simulate specific damage in actual working conditions. Summary of the Invention

[0003] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dynamic fatigue performance testing device for a thermoplastic elastomer, comprising: a test frame, an external assembly of which is equipped with a transparent partition, the transparent partition seals the test frame to form an experimental sealed chamber; loading units are symmetrically distributed on the test frame and located in the experimental sealed chamber, and an elastic material is connected between the two loading units; a temperature sensor is installed on the inner wall of the transparent partition; a control mechanism is horizontally fixed in the experimental sealed chamber of the test frame, a steel knife mechanism is installed on one side of the control mechanism, and the elastic material is passed through the steel knife mechanism; the steel knife mechanism comprises: a machine base, an internal rotation of which is connected to a low roller for supporting the bottom of the elastic material; a steel knife seat is installed in the machine base and vertically slidably connected to the machine base through a top shaft fixed above it; a pressure loss unit is arranged in the machine base and is located on one side of the steel knife seat.

[0004] Preferably, a heater and a refrigerator are provided in the transparent partition; and an industrial camera is installed on the test stand.

[0005] Preferably, the loading unit includes: a hydraulic cylinder, a telescopic end of which is fixed with an outer shaft seat, and an inner shaft is slidably connected to the outer shaft seat; a coupling, fixed to one end of the inner shaft; a positioning sleeve, coaxially connected to the other end of the coupling, and the positioning sleeve is provided with a through hole for pulling the elastic material; a stress sensor, installed between the coupling and the positioning sleeve.

[0006] Preferably, an ultrasonic vibrator is provided in the outer shaft seat, and an output end of the ultrasonic vibrator is connected to the inner shaft.

[0007] Preferably, the steel knife seat is located directly above the low roller; and a knife body is fixed below the steel knife seat, and the blade of the knife body is arranged at an angle.

[0008] Preferably, the control mechanism includes: a horizontal frame, a track groove is opened on the surface of which, a movable plate is slidably installed outside the track groove of the horizontal frame, a screw mechanism is provided inside the horizontal frame, and the movable plate is threadedly driven by the screw mechanism; a carrier, horizontally fixed on the movable plate, and two guide rods are fixed in parallel on one side of the carrier; a machine plate, slidably installed on the guide rod, and the steel knife mechanism is fixed to the machine plate through a support rod seat; a fine-tuning cylinder, fixed on one side of the carrier, and the output end of the fine-tuning cylinder is fixed to the machine plate.

[0009] Preferably, a limiting spring is connected between the steel knife seat and the machine base, a transmission rod is rotatably connected inside the machine base, a straight slot hole is provided at one end of the transmission rod, and an axle pin is fixed on the side wall of the top shaft, and the axle pin is slidingly connected to the straight slot hole; a connecting rod is rotatably connected inside the machine base, and one end of the connecting rod abuts against the other end of the transmission rod; a propulsion cylinder is hinged on the machine base, and the output end of the propulsion cylinder is connected to the connecting rod; a transmission wheel is rotatably connected inside the machine base.

[0010] Preferably, the pressure loss unit includes: two fixed seats, which are symmetrically arranged and fixed in the machine base, and the fixed seats are connected to the shaft tube through axial rotation; a shaft pressure plate, which is coaxially arranged on one side of each fixed seat, and one end of the shaft pressure plate is fixed with a shaft sleeve, and the shaft sleeve is slidingly connected to the shaft tube; claws, which are circumferentially distributed in the shaft pressure plate, and each of the claws is synchronously radially slid and adjusted along the shaft pressure plate; a toggle rod, which is hinged on the lower end face of the fixed seat, and an electric telescopic cylinder is installed on the fixed seat, and one end of the electric telescopic cylinder is hinged to the toggle rod; an inner spring, which is sleeved on the outside of the shaft tube and located in the shaft sleeve.

[0011] Preferably, the two shaft pressure plates of the fixing seats move toward each other when pushed by the toggle rod;

[0012] A worm gear is fixed outside the shaft tube, and a control motor is arranged outside the machine base. The output end of the control motor is meshed with the worm gear through a worm.

[0013] Preferably, a method for testing the dynamic fatigue performance of a thermoplastic elastomer comprises the following steps:

[0014] Step 1: Select a strip of elastic material of standard specifications, stretch the elastic material horizontally and place it between the loading units, and fix the ends of the elastic material with the positioning sleeves in the loading units. At this time, the elastic material is inserted into the steel knife mechanism on the control mechanism;

[0015] Step 2: The steel knife mechanism selects one or more intermediate points on the surface of the elastic material to perform fatigue damage, so that the elastic material reaches a corresponding degree of fatigue damage. The steel knife seat in the steel knife mechanism can use the knife body to cut into the interior of the elastic material from the outer peripheral wall to form an incision of a specified depth. Then, the pressure loss unit uses two axial pressure plates distributed on the left and right to squeeze and compress the incision, so that the fiber layer of the elastic material expands and debonds at the incision position, thereby increasing the crack at the incision.

[0016] Step 3: Entering the test phase, the steel knife mechanism is separated from the pressure loss position on the surface of the elastic material and moved to its end without affecting the experimental observation. The test environment temperature in the experimental sealed chamber is adjusted using a heater or a refrigerator;

[0017] Step 4: The two loading units are slowly loaded and reach the test tension, and the ultrasonic vibrator can be used to apply axial high-frequency vibration to the coupling;

[0018] Step 5: The industry monitors the changes in the pressure loss position of the elastic material in real time, and finally records the overall process of fatigue fracture of the elastic material.

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

[0020] In the present invention, for the fatigue performance test of elastic materials, a loading unit is mainly used to provide dynamic tensile stress to the elastic material, and an industrial camera is used to record the entire fatigue fracture process. However, the steel knife mechanism mainly provided can use the steel knife holder to pre-form the incision on the surface of the elastic material, so that fatigue damage is formed at a single point or multiple points in the middle position of the elastic material, so that the elastic material enters the crack propagation stage faster, thereby significantly shortening the time required for the entire fatigue fracture process, improving the test efficiency, and eliminating the difficulty of finding or manually controlling the breakpoint during fatigue testing of elastic materials; and the pressure loss unit also provided therein can use two axial pressure plates to extrude and expand the incision position on the surface of the elastic material, so that the fibers at the incision can be debonded and accelerate crack initiation, effectively controlling the crack formation position, and allowing the initiation and propagation behavior of multiple cracks to be studied simultaneously in one test, focusing the fatigue test on the key parts or the areas most prone to failure of the elastic material, or used to simulate damage at specific positions in actual working conditions (such as seams, connection points, etc.), making the test more targeted. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 Schematic diagram of the structure of the steel knife mechanism and the pressure loss unit in the present invention;

[0023] Figure 3 Schematic diagram of the structure of the loading unit in the present invention;

[0024] Figure 4 Schematic diagram of the structure of the control mechanism of the present invention;

[0025] Figure 5 Schematic diagram of the structure of the steel knife mechanism of the present invention;

[0026] Figure 6 Schematic diagram of the structure of the pressure loss unit in the present invention;

[0027] In the figure: 1. Test frame; 11. Transparent partition; 2. Loading unit; 21. Hydraulic cylinder; 22. Outer shaft seat; 23. Coupling; 24. Positioning sleeve; 25. Stress sensor; 3. Control mechanism; 31. Cross frame; 32. Moving plate; 33. Guide rod; 34. Machine plate; 35. Fine adjustment cylinder; 4. Pressure loss unit; 41. Fixed seat; 42. Shaft tube; 43. Shaft pressure plate; 44. Shaft sleeve; 45. Claw; 46. Toggle rod; 47. Electric telescopic cylinder; 48. Inner spring; 49. Worm gear; 5. Steel knife mechanism; 51. Machine base; 52. Low roller; 53. Steel knife seat; 54. Top shaft; 55. Limit spring; 56. Transmission rod; 57. Connecting rod; 58. Propulsion cylinder; 59. Transmission wheel. DETAILED DESCRIPTION

[0028] See also Figures 1-6 In an embodiment of the present invention, a device for testing dynamic fatigue properties of a thermoplastic elastomer includes:

[0029] The test frame 1 is assembled with a transparent partition 11 on the outside. The transparent partition 11 seals the test frame 1 to form a sealed experimental chamber, which is convenient for providing a sealed environment for testing experiments.

[0030] The loading units 2 are symmetrically distributed on the test frame 1 and located in the test sealed chamber, and an elastic material is connected between the two loading units 2;

[0031] A temperature sensor is installed on the inner wall of the transparent partition 11 to monitor the internal temperature changes of the test environment in real time;

[0032] The control mechanism 3 is fixed horizontally in the experimental sealed chamber of the test frame 1. A steel knife mechanism 5 is installed on one side of the control mechanism 3. The elastic material is inserted into the steel knife mechanism 5. Therefore, in the early stage of the experiment, the elastic material needs to be manually bound or fixed between the loading units 2 and passed through the steel knife mechanism 5 by the experimenter;

[0033] The steel knife mechanism 5 comprises:

[0034] A machine base 51, internally of which a low roller 52 for supporting the bottom of the elastic material is rotatably connected;

[0035] The steel cutter holder 53 is mounted in the machine base 51 and is vertically slidably connected to the machine base 51 via a top shaft 54 ​​fixed above it; it can contact the surface of the elastic material during vertical sliding, thereby pre-treating the surface of the elastic material to prevent initial fatigue damage to the elastic material;

[0036] The pressure loss unit 4 is arranged in the machine base 51 and is located on one side of the steel knife base 53.

[0037] In this embodiment, a heater and a refrigerator (not shown in the figure) are provided in the transparent partition 11 to adjust the temperature change inside the experimental sealed chamber;

[0038] The test stand 1 is equipped with an industrial camera with high resolution, which can monitor the complete fatigue fracture process during the elastic material test.

[0039] As a preferred embodiment, the loading unit 2 includes:

[0040] The hydraulic cylinder 21 has an outer shaft seat 22 fixed to its telescopic end, which can provide stable stress loading in the horizontal direction. The inner shaft is slidably connected to the outer shaft seat 22;

[0041] A coupling 23, fixed to one end of the inner shaft;

[0042] A positioning sleeve 24 is coaxially connected to the other end of the coupling 23. The positioning sleeve 24 is provided with a through hole for pulling the elastic material so that the end of the elastic material is bound in the through hole to prevent the end of the elastic material from being separated during stress loading.

[0043] The stress sensor 25 is installed between the coupling 23 and the positioning sleeve 24 and can monitor the stress loading changes in real time.

[0044] In this embodiment, an ultrasonic vibrator is provided in the outer shaft seat 22, and the output end of the ultrasonic vibrator is connected to the inner shaft. Therefore, the ultrasonic vibrator can intervene in the work during the test process, and provide axial dynamic traction to the two ends of the elastic material through the coupling 23, thereby realizing dynamic testing of the elastic material and further shortening the test cycle.

[0045] In this embodiment, the steel knife seat 53 is located directly above the low roller 52; and a knife body is fixed below the steel knife seat 53, and the blade of the knife body is set at an angle, so that the tip of the blade of the knife body can cut into the elastic material to a specified depth, so that the surface of the elastic material forms different degrees of incision damage effects.

[0046] In this embodiment, the control mechanism 3 includes:

[0047] The cross frame 31 has a track groove on its surface. A movable plate 32 is slidably mounted outside the track groove of the cross frame 31. A screw mechanism is provided inside the cross frame 31. The movable plate 32 is threadedly driven by the screw mechanism.

[0048] The carrier is fixed horizontally on the movable plate, and two guide rods 33 are fixed parallel to one side of the carrier;

[0049] The machine plate 34 is slidably mounted on the guide rod 33, and the steel knife mechanism 5 is fixed to the machine plate 34 via a support rod seat;

[0050] The fine-tuning cylinder 35 is fixed on one side of the carrier, and the output end of the fine-tuning cylinder 35 is fixed to the machine plate 34. That is to say, in the initial stage of the test, the movable plate can be slidably adjusted to effectively control the horizontal positioning point of the steel knife mechanism 5, so that it can quickly reach the middle position of the elastic material. The fine-tuning cylinder 35 can provide sliding fine-tuning of the steel knife mechanism 5 under telescopic adjustment to improve the displacement accuracy. Therefore, it can control the horizontal displacement of the steel knife seat 53 when the steel knife seat 53 cuts the surface of the elastic material, thereby changing the incision length.

[0051] As a preferred embodiment, a limit spring 55 is connected between the steel knife seat 53 and the machine base 51, and a transmission rod 56 is rotatably connected in the machine base 51. A straight slot hole is opened at one end of the transmission rod 56, and an axle pin is fixed on the side wall of the top shaft 54, and the axle pin is slidably connected to the straight slot hole;

[0052] A connecting rod 57 is rotatably connected to the base 51 , and one end of the connecting rod 57 abuts against the other end of the transmission rod 56 ;

[0053] A propulsion cylinder 58 is hinged on the machine base 51, and the output end of the propulsion cylinder 58 is connected to the connecting rod 57; therefore, when the propulsion cylinder 58 contracts and pulls the end of the connecting rod 57 downward, its other end forms a lifting effect on the end of the transmission rod 56, and the transmission rod 56 can utilize the sliding action of the straight slot hole and the axle pin under corresponding deflection to gradually press the steel knife seat 53 downward, so that it cuts into the surface of the elastic material.

[0054] A transmission wheel 59 is rotatably connected to the base 51 .

[0055] In this embodiment, the pressure loss unit 4 includes:

[0056] The fixing bases 41 are symmetrically arranged and fixed in the machine base 51. The fixing bases 41 are connected to the shaft tube 42 through axial rotation.

[0057] A shaft pressure plate 43 is coaxially arranged on one side of each of the fixing seats 41 , and a shaft sleeve 44 is fixed to one end of each of the shaft pressure plates 43 , and the shaft sleeve 44 is slidably connected to the shaft tube 42 ;

[0058] The claws 45 are circumferentially distributed within the shaft pressure plate 43. Each of the claws 45 is synchronously slidably adjusted radially along the shaft pressure plate 43 (mechanical synchronization or hydraulic synchronization can be used, which belongs to the prior art and will not be described in detail). The claws 45 can clamp the surface of the elastic material.

[0059] The toggle rod 46 is hinged to the lower end surface of the fixed base 41. The fixed base 41 is equipped with an electric telescopic cylinder 47. One end of the electric telescopic cylinder 47 is hinged to the toggle rod 46. The other end of the toggle rod 46 contacts the shaft pressure plate 43.

[0060] The inner spring 48 is sleeved outside the shaft tube 42 and located in the shaft sleeve 44. Therefore, when the electric telescopic cylinder 47 is under telescopic adjustment, the shaft pressure plate 43 can slide axially under the toggle rod 46 to achieve axial pressure loading on the elastic material.

[0061] In this embodiment, the axial pressure plates 43 of the two fixing seats 41 move toward each other under the push of the toggle rod 46. Therefore, after the steel knife seat 53 completes the incision on the surface of the elastic material, the two axial pressure plates 43 perform high-intensity extrusion on the incision position of the elastic material during sliding. At this time, the fiber layer of the incision of the elastic material is debonded and expands to form cracks. The debonding cracks formed by such extrusion are closer to the delamination or interface failure mode in the actual working condition, making the test results more valuable for reference. In addition, the position and direction of the cracks formed by extrusion are strictly limited to the pre-incision area. The industrial camera can focus in advance to facilitate the complete capture of the fatigue test behavior from the first frame.

[0062] A worm gear 49 is also fixed to the outside of the shaft tube 42, and a control motor (not shown in the figure) is provided outside the machine base 51. The output end of the control motor is engaged with the worm gear 49 through a worm, which can control the two shaft pressure plates 43 to rotate in opposite directions, causing further distortion at the cut of the elastic material and enhancing the significance of fatigue damage.

[0063] A method for testing the dynamic fatigue performance of a thermoplastic elastomer comprises the following steps:

[0064] Step 1: Select a strip of elastic material of standard specifications, stretch the elastic material horizontally and place it between the loading units 2. The ends of the elastic material are fixed by the positioning sleeves 24 in the loading units 2. At this time, the elastic material is inserted into the steel knife mechanism 5 on the control mechanism 3.

[0065] Step 2: The steel knife mechanism 5 selects one or more intermediate points on the surface of the elastic material for fatigue damage, so that the elastic material reaches a corresponding degree of fatigue damage, wherein the steel knife seat 53 in the steel knife mechanism 5 can use the knife body to cut into the interior of the elastic material from the outer peripheral wall to form an incision of a specified depth, and then the steel knife mechanism 5 can slide horizontally along the cross frame 31 with the random plate 34 so that the two pressure loss units 4 in the machine seat 51 are respectively located on both sides of the incision, and the pressure loss unit 4 uses two axial pressure plates 43 distributed on the left and right to squeeze and compress the incision, so that the fiber layer of the elastic material is expanded and debonded at the incision position, and the crack at the incision is increased, thereby significantly shortening the time required for the entire fatigue fracture process, improving the test efficiency, and eliminating the difficulty of finding the breakpoint or difficult to control manually during fatigue testing of elastic materials;

[0066] Step 3: Entering the test phase, the steel knife mechanism 5 is separated from the pressure loss position on the surface of the elastic material and moved to its end without affecting the experimental observation. The test environment temperature in the experimental sealed chamber is adjusted using a heater or a refrigerator;

[0067] Step 4: The two loading units 2 are slowly loaded and reach the test tension. The ultrasonic vibrator can be used to apply axial high-frequency vibration to the coupling 23, thereby providing axial dynamic traction to both ends of the elastic material through the coupling 23, realizing dynamic testing of the elastic material and further shortening the test cycle.

[0068] Step 5: The industry monitors the changes in the pressure loss position of the elastic material in real time, and finally records the overall process of fatigue fracture of the elastic material.

[0069] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A thermoplastic elastomer dynamic fatigue performance testing device, characterized in that: It includes: The test frame (1) is assembled with a transparent partition (11) on the outside, and the transparent partition (11) seals the test frame (1) to form a sealed experimental chamber; The loading units (2) are symmetrically distributed on the test frame (1) and located in the test sealed chamber, and an elastic material is connected between the two loading units (2); A temperature sensor is mounted on the inner wall of the transparent partition (11); A control mechanism (3) is horizontally fixed in the experimental sealed chamber of the test frame (1); a steel knife mechanism (5) is installed on one side of the control mechanism (3); and an elastic material is inserted into the steel knife mechanism (5); The steel knife mechanism (5) comprises: A machine base (51) having a low roller (52) rotatably connected thereto for supporting the bottom of the elastic material; The steel knife seat (53) is installed in the machine base (51) and is vertically slidably connected to the machine base (51) through a top shaft (54) fixed above the steel knife seat (53); A pressure loss unit (4) is arranged in the machine base (51) and is located on one side of the steel knife base (53); The steel knife seat (53) is located directly above the low roller (52); and a knife body is fixed below the steel knife seat (53), and the blade of the knife body is arranged at an angle; A limit spring (55) is connected between the steel knife seat (53) and the machine base (51), and a transmission rod (56) is rotatably connected in the machine base (51), one end of the transmission rod (56) is provided with a straight slot hole, and an axis pin is fixed on the side wall of the top shaft (54), and the axis pin is slidably connected to the straight slot hole; A connecting rod (57) is rotatably connected in the machine base (51), and one end of the connecting rod (57) abuts against the other end of the transmission rod (56); A propulsion cylinder (58) is hingedly connected to the machine base (51), and an output end of the propulsion cylinder (58) is connected to the connecting rod (57); A transmission wheel (59) is rotatably connected in the machine base (51).

2. A thermoplastic elastomer dynamic fatigue performance testing device according to claim 1, characterized in that: A heater and a refrigerator are provided in the transparent partition (11); An industrial camera is installed on the test stand (1).

3. The dynamic fatigue performance testing device for thermoplastic elastomer according to claim 1, characterized in that: The loading unit (2) comprises: A hydraulic cylinder (21) having an outer shaft seat (22) fixed to its telescopic end, wherein an inner shaft is slidably connected to the outer shaft seat (22); A coupling (23) fixed to one end of the inner shaft; A positioning sleeve (24) is coaxially connected to the other end of the coupling (23), and a hole for pulling the elastic material is provided in the positioning sleeve (24); The stress sensor (25) is installed between the coupling (23) and the positioning sleeve (24).

4. A thermoplastic elastomer dynamic fatigue performance testing device according to claim 3, characterized in that: An ultrasonic vibrator is provided in the outer shaft seat (22), and an output end of the ultrasonic vibrator is connected to the inner shaft.

5. The dynamic fatigue performance testing device for thermoplastic elastomer according to claim 1, characterized in that: The control mechanism (3) comprises: A horizontal frame (31) is provided with a track groove on its surface, a movable plate (32) is slidably mounted outside the track groove of the horizontal frame (31), a screw mechanism is provided inside the horizontal frame (31), and the movable plate (32) is threadedly driven by the screw mechanism; The carrier is fixed horizontally on the movable plate, and two guide rods (33) are fixed in parallel on one side of the carrier; A machine plate (34) is slidably mounted on the guide rod (33), and the steel knife mechanism (5) is fixed to the machine plate (34) via a support rod seat; A fine adjustment cylinder (35) is fixed on one side of the carrier, and an output end of the fine adjustment cylinder (35) is fixed to the machine plate (34).

6. The thermoplastic elastomer dynamic fatigue performance testing device according to claim 3, characterized in that: The pressure loss unit (4) comprises: Two fixed seats (41) are symmetrically arranged and fixed in the machine base (51), and the interior of the fixed seat (41) is connected to the shaft tube (42) through axial rotation; An axial pressure plate (43) is coaxially arranged on one side of each of the fixing seats (41), and a shaft sleeve (44) is fixed to one end of each of the axial pressure plates (43), and the shaft sleeve (44) is slidably connected to the shaft tube (42); Clamping claws (45) are circumferentially distributed within the shaft pressure plate (43), and each of the clamping claws (45) is synchronously radially slidably adjusted along the shaft pressure plate (43); A toggle rod (46) is hinged to the lower end surface of the fixed seat (41); an electric telescopic cylinder (47) is mounted on the fixed seat (41); one end of the electric telescopic cylinder (47) is hinged to the toggle rod (46); An inner spring (48) is sleeved outside the shaft tube (42) and located in the shaft sleeve (44).

7. A thermoplastic elastomer dynamic fatigue performance testing device according to claim 6, characterized in that: The shaft pressure plates (43) of the two fixing seats (41) move toward each other under the push of the toggle rod (46); A worm gear (49) is fixed outside the shaft tube (42), and a control motor is provided outside the machine base (51). The output end of the control motor is meshed with the worm gear (49) through a worm.

8. A method for testing the dynamic fatigue performance of a thermoplastic elastomer, using the device for testing the dynamic fatigue performance of a thermoplastic elastomer according to claim 7, characterized in that: It includes the following steps: Step 1: Select a strip of elastic material of standard specifications, stretch the elastic material horizontally and place it between the loading units (2), and fix the ends of the elastic material with the positioning sleeve (24) in the loading unit (2). At this time, the elastic material is inserted into the steel knife mechanism (5) on the control mechanism (3); Step 2: The steel knife mechanism (5) selects one or more intermediate points on the surface of the elastic material to perform fatigue damage, so that the elastic material reaches a corresponding degree of fatigue damage, wherein the steel knife seat (53) in the steel knife mechanism (5) can use the knife body to cut into the interior of the elastic material from the outer peripheral wall, forming an incision of a specified depth, and then the pressure loss unit (4) uses two axial pressure plates (43) distributed on the left and right to squeeze and compress the incision, so that the fiber layer of the elastic material is expanded and debonded at the incision position, thereby increasing the crack at the incision; Step 3: Entering the test phase, the steel knife mechanism (5) is separated from the pressure loss position on the surface of the elastic material and moved to its end without affecting the experimental observation, and the test environment temperature in the experimental sealed chamber is adjusted using a heater or a refrigerator; Step 4: The two loading units (2) are respectively slowly loaded to reach the test tension, and the ultrasonic vibrator can be used to apply axial high-frequency vibration to the coupling (23); Step 5: The industry monitors the changes in the pressure loss position of the elastic material in real time, and finally records the overall process of fatigue fracture of the elastic material.

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