Metal material fatigue performance simulation test device and method

Abstract

The invention discloses a metal material fatigue performance simulation test device and method. Belongs to the field of metal testing devices and comprises a base, a clamping component, an adjusting component and a driving component, the clamping component is fixed on the base, the driving component is fixed above the base through a support, and the adjusting component is arranged on the support. The metal device needing to be tested is clamped and fixed through the clamping part, and the situation that the testing effect is affected due to loosening and displacement in the testing period is avoided. Meanwhile, the clamping part can be adjusted according to the sizes of different workpieces, and the requirements for testing the workpieces of different sizes are met. The driving part drives the metal test piece to shake and bend back and forth for fatigue performance testing, and the moving path of the driving part can be limited through the adjusting part. And the adjusting part can greatly drive the test metal to move, so that different test requirements are met.

Description

Technical Field

[0001] This invention belongs to the field of metal testing devices, and relates to a simulation testing device and method for fatigue performance of metallic materials. Background Technology

[0002] Metal fatigue testing refers to experiments used to determine the fatigue properties of metallic materials. It is a testing method used to evaluate the performance and lifespan of metallic materials under alternating loads. It simulates the stress conditions of materials or components under actual working conditions, measures the σ-1 of the metallic material, plots the SN curve, observes fatigue failure phenomena and fracture characteristics, and learns to determine the fatigue limit of metallic materials under symmetrical cyclic loading. It observes the fatigue failure state and fracture characteristics of the metallic material to obtain fatigue data. However, existing metal fatigue testing equipment has a fixed range of movement during testing, which cannot be flexibly adjusted according to different testing requirements, resulting in significant limitations. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simulation testing device and method for fatigue performance of metallic materials. The metal fatigue testing device has a fixed test range and cannot flexibly adjust the amplitude of alternating load during testing according to different test materials and test requirements. To achieve the above objectives, the present invention employs the following technical solution: A simulation testing device for fatigue performance of metallic materials includes a base, on which a first driving mechanism is provided, and on which a first clamping structure is provided; a limiting plate and a driving seat are fixed above the base and disposed opposite to each other. The limiting plate has an arc-shaped limiting groove, a sliding sleeve is fitted in the limiting groove, and a clamping rod is provided in the sliding sleeve; A second drive mechanism is installed on the drive base, and two opposing fixed plates are fixedly arranged on the second drive mechanism, with a spring installed on at least one fixed plate. A pressure bar is installed on each of the opposite ends of the spring and the fixed plate, or a pressure bar is installed on each of the opposite ends of the spring; One end of the clamping rod passes through the sliding sleeve, and the other end is clamped between the two pressure rods.

[0004] A further improvement of the present invention is that: Preferably, the first drive mechanism includes an adjusting motor and a first drive shaft, the power output end of the adjusting motor is connected to the first drive shaft, and the surface of the first drive shaft is provided with two sections of threads with opposite directions of rotation.

[0005] Preferably, the clamping structure includes a first clamping block and a second clamping block respectively disposed on the two sections of threads with opposite directions of rotation.

[0006] Preferably, the second drive mechanism includes a drive motor and a second drive shaft, the power output end of the drive motor is connected to the second drive shaft, a drive block is threadedly connected to the second drive shaft, and the two fixing plates are mounted on the drive block.

[0007] Preferably, the spring is provided with a clamping plate, and the pressure rod is connected to the spring through the clamping plate.

[0008] Preferably, a locking plate is installed at the front end of the drive block, and a second reverse tooth is installed on the locking plate. The second reverse tooth contacts the bottom of the pressure plate. The second reverse tooth is an inclined tooth shape, and the inclination direction is opposite to the spring compression direction.

[0009] Preferably, a locking plate is installed at the front end of the drive block, and a first reverse tooth is installed at the bottom of the clamping plate. The first reverse tooth contacts the upper end surface of the locking plate. The first reverse tooth is an inclined tooth shape, and the inclination direction is opposite to the compression direction of the spring.

[0010] Preferably, a locking plate is installed at the front end of the drive block, a first reverse tooth is installed at the bottom of the clamping plate, and a second reverse tooth is installed on the locking plate. The first and second reverse teeth are in contact, and the first and second reverse teeth are inclined teeth, with the inclination direction opposite to the compression direction of the spring.

[0011] Preferably, the length of the pressure rod is greater than the height of the limiting groove.

[0012] A testing method for the above-mentioned fatigue performance simulation testing device for metallic materials includes the following steps: S1, the lower end of the metal material to be tested is held by the first clamping structure, and the upper end is held by the clamping rod; S2, the second drive mechanism drives the upper end of the clamping rod to move back and forth along the limiting groove, thereby driving the upper end of the metal material to be tested to move back and forth, while the lower end of the clamping rod remains fixed. S3. Observe the changes in the state of the metal material to be tested, and whether cracks, plastic deformation or fractures occur.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a simulation testing device for the fatigue performance of metallic materials. A clamping component securely holds the metal part to be tested, preventing loosening and displacement during testing that could affect the test results. The clamping component can also be adjusted to accommodate different workpiece sizes, meeting the needs of testing workpieces of varying dimensions. A driving component moves the metal test piece back and forth, swaying and bending it to perform fatigue performance testing. An adjusting component can limit the movement path of the driving component; it can also allow for significant movement of the test metal, meeting different testing requirements. This invention achieves reciprocating motion through the cooperation of an arc-shaped limiting groove and a sliding sleeve. Combined with a bidirectional driving mechanism and an elastic clamping structure, it forms a variable load application method, capable of simulating the stress state of materials under complex working conditions. It has the advantages of adjustable test range, flexible clamping method, and the ability to simulate multi-directional load conditions.

[0014] Furthermore, the first drive mechanism is equipped with two threads with opposite directions of rotation, each thread having two speed-adjusting mechanisms with opposite directions but identical structures, which enables it to clamp the bottom of the metal material.

[0015] Furthermore, the second driving mechanism is driven by a drive motor and a drive shaft, which in turn drives a drive block mounted on it. The drive block enables the clamping rod to move the upper end of the metal material to be tested.

[0016] Furthermore, the connection force between the spring and the pressure rod is enhanced by the setting of the pressure plate.

[0017] Furthermore, by setting the second reverse tooth on the locking plate, the clamping rod is pushed to clamp, thereby enhancing the clamping force of the clamping rod.

[0018] Furthermore, by setting the first reverse tooth of the clamping plate, the clamping rod is pushed to hold the clamp, thereby enhancing the clamping force of the clamping rod. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a simulation testing device for fatigue performance of metallic materials provided in a specific embodiment of the present invention; Figure 2 yes Figure 1 A top view of the adjustment and drive components; Figure 3 This is a front view schematic diagram of the drive seat structure in this application; Figure 4 yes Figure 3 Enlarged structural diagram at point A in the middle.

[0020] In the diagram: 1. Base; 11. Clamping seat; 12. First clamping block; 13. Second clamping block; 14. Adjusting motor; 15. First drive shaft; 2. Bracket; 3. Adjusting component; 31. Limiting plate; 32. Limiting groove; 33. Sliding sleeve; 34. Clamping rod; 35. Pressing rod; 4. Driving component; 41. Driving seat; 42. Driving block; 43. First fixing plate; 44. Second fixing plate; 441. Pressing plate; 442. Spring; 45. Drive motor; 46. Second drive shaft; 47. Locking plate; 48. First reverse tooth; 49. Second reverse tooth. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings: Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] like Figures 1-4 As shown in the figure, an embodiment provides a simulation testing device for the fatigue performance of metallic materials, including a base 1, a clamping component 3, an adjusting component, and a driving component. The clamping component is fixed on the base 1, the driving component is fixed above the base 1 via a bracket 2, and the adjusting component is disposed on the bracket 2.

[0023] First, the bottom of the metal material to be tested is clamped and fixed onto the clamping component, while the top of the metal material is clamped onto the adjusting component. Then, the drive component is activated. The drive component moves the adjusting component, performing reciprocating bending motions on the material to achieve the fatigue performance test of the metal material.

[0024] The synergistic effect of the arc-shaped limiting groove and the sliding sleeve assembly enables precise control of the sample's swing angle and amplitude. The spring assembly and clamping structure allow for the clamping of metal parts of various sizes, and the spring assembly also buffers the impact load of the drive mechanism. The adjustable arc-shaped swing mode can simulate more complex real-world conditions, obtaining more accurate fatigue performance data.

[0025] Furthermore, the clamping component includes a clamping seat 11, a first clamping block 12, a second clamping block 13, and a first drive shaft 15. The clamping seat 11 has a sliding groove, and the first clamping block 12 and the second clamping block 13 are slidably connected to the sliding groove. The first drive shaft 15 is composed of two screws with opposite threads, and passes through one side of the clamping seat 11 and is threadedly connected to the first clamping block 12 and the second clamping block 13. Rotation of the first drive shaft 15 can drive the movement of the first clamping block 12 and the second clamping block 13. Since the first drive shaft 15 is composed of two screws with opposite threads, and each screw is threadedly engaged with the first clamping block 12 and the second clamping block 13, rotation of the first drive shaft 15 allows the first clamping block 12 and the second clamping block 13 to move towards each other or away from each other, thereby clamping or releasing the workpiece.

[0026] Furthermore, the clamping component also includes an adjusting motor 14, which is fixed to one side of the clamping base 11. The power output end of the adjusting motor 14 is fixedly connected to one end of the first drive shaft 15, and the other end of the first drive shaft 15 is rotatably connected to the slide groove. By using the adjusting motor 14 to drive the first drive shaft 15 to rotate forward and reverse, rapid clamping and releasing can be achieved. At the same time, the adjusting motor 14 is also a self-locking motor, which can lock after moving into position to prevent the clamping block from shifting.

[0027] Further, the adjusting component includes a limiting plate 31, a sliding sleeve 33, and clamping rods 34. The adjusting component is located above the clamping component. The limiting plate 31 is fixed to the bracket 2 and is located in front of the driving block 42. An arc-shaped limiting groove 32 is provided on the limiting plate 31, and a sliding sleeve 33 is slidably connected within the arc-shaped limiting groove 32. The sliding sleeve 33 is fitted into the arc-shaped limiting groove 32 and is barrel-shaped with both ends connected. Two clamping rods 34 are hinged together to form a clamping member. The clamping member extends through the sliding sleeve 33 to both sides of the sliding sleeve 33. One end of the clamping rod 34 is the first end, and the opposite end is the second end. The hinged part in the middle of the clamping rod 34 is in the sliding sleeve 33. The first end is between the adjusting component 3 and the driving component, and the second end is on the other side of the adjusting component 3. The first end of the clamping rod 34 clamps the upper end of the metal material. Driven by the driving component, the clamping rod 34 and the metal material slide on the limiting groove 32. The direction and width of the limiting groove 32 can be set according to the needs of the test. If different test effects and test paths are required, simply replace the limiting plate 31.

[0028] The driving component 4 includes a drive motor 45, a second drive shaft 46, a drive block 42, and a drive base 41. The drive base 41 is fixedly mounted on the bracket 2 and positioned on one side of the limiting plate 31. The second drive shaft 46 is configured as a screw. The drive motor 45 is fixed to the drive base 41, with one end of the second drive shaft 46 rotatably connected to the drive base 41 and the other end fixedly connected to the power output end of the drive motor 45. The drive block 42 is slidably connected to the drive base 41, and the second drive shaft 46 passes through the drive block 42 and is threadedly engaged with it. The drive motor 45 drives the second drive shaft 46 to rotate, and the rotating second drive shaft 46 drives the drive block 42 to move on the drive base 41 through the threaded engagement. By switching the forward and reverse rotation of the drive motor 45, the second drive shaft 46 is driven to rotate forward or reverse, thereby realizing the reciprocating movement of the drive block 42. The drive block 42 can also move one end of the clamping rod 34, which drives the sliding sleeve 33 to move along the limiting groove 32, and simultaneously moves the upper end of the test metal material.

[0029] The drive block 42 is equipped with clamping components, including a first fixing plate 43, a second fixing plate 44, a spring 442, and a pressure plate 441. Both the first fixing plate 43 and the second fixing plate 44 are fixed to the front end of the drive block 42. A spring is provided on the inner end face of either the first fixing plate 43 or the second fixing plate 44, or springs 442 are provided on both fixing plates. One end of each spring 442 is connected to a fixing plate, and the other end is connected to a pressure plate 441. The pressure plate 441 is slidably connected to the front end of the drive block 42. Each pressure plate 441 is fixedly connected to a pressure rod 35.

[0030] When the second drive mechanism moves the drive block 42, the spring transmits pressure evenly to the pressure rods through the clamping plate 441, ensuring that the clamping rod 34 remains stably clamped between the pressure rods 441. The planar structure of the clamping plate 441 can disperse the concentrated stress generated by the spring, preventing the pressure rod 35 from deforming due to localized stress. During the test, the elastic deformation of the spring 442 is converted into a flexible clamping force on the clamping rod 34 through the clamping plate 441, thereby adapting to the clamping requirements of samples of different sizes.

[0031] In one specific embodiment, pressure rods 35 are vertically fixed to one side of the pressure plate 441 and the left side of the first fixing plate 43.

[0032] In one specific embodiment, each of the two fixing plates is provided with a spring 442, and a pressing plate 441 is provided on the inner side of each spring. A vertical pressing rod is provided on the inner side of each pressing plate 441.

[0033] Two pressure rods 35 are fixedly connected to the outer sides of two clamping rods 34, respectively. The length of the pressure rods 35 is greater than the height of the entire limiting groove 32, ensuring that the ends of the clamping rods 34 held by the two pressure rods 35 can meet the vertical displacement requirements when the clamping rods 34 move in the limiting groove 32. The clamping plate 441 and the first fixing plate 43 press the two clamping rods 34 together through the pressure rods 35 to prevent them from loosening during the test. At the same time, the long design of the pressure rods 35 can maintain clamping even when the vertical position of the clamping rods 34 changes, and can maintain the fixation of the metal throughout the entire test.

[0034] In one specific embodiment, a locking plate 47 is installed at the front end of the drive block 42. A second reverse tooth 49 is installed on the locking plate 47, and the second reverse tooth 49 contacts the bottom of the clamping plate 441. The second reverse tooth 49 is inclined and pointed, and the inclination direction is opposite to the compression direction of the spring 442. This structure allows the clamping rod 34 to not only receive the outward elastic force of the spring, but also for the second reverse tooth 49 to provide a certain pushing force to the clamping plate 441. When the clamping rod 34 expands outward, the inclined and pointed second reverse tooth 49 can cooperate with the spring to push the clamping rod 34 inward, increasing the clamping force of the clamping rod 34. The inclined tooth structure of the second reverse tooth will form mechanical interference with the bottom of the clamping plate, preventing the clamping plate from moving in the opposite direction, thereby maintaining the stability of the clamping force of the clamping rod. This structure uses a toothed self-locking mechanism to offset the displacement deviation caused by the spring rebound, ensuring that the clamping position does not shift during the test.

[0035] In one specific embodiment, a locking plate 47 is installed at the front end of the drive block 42, and a first reverse tooth 48 is installed at the bottom of the clamping plate 441. The first reverse tooth 48 contacts the upper end of the locking plate 47, and the first reverse tooth 48 is inclined in the opposite direction to the compression direction of the spring 442. This structure allows the clamping rod 34 to not only receive the outward elastic force of the spring, but also for the first reverse tooth 48 to provide a certain pushing force to the clamping plate 441. When the clamping rod 34 expands outward, the inclined, pointed first reverse tooth 48 can cooperate with the spring to push the clamping rod 34 in the clamping direction, thereby increasing the clamping force of the clamping rod 34.

[0036] See Figure 4In one specific embodiment, a locking plate 47 is installed at the front end of the drive block 42, a first reverse tooth 48 is installed at the bottom of the clamping plate 441, and a second reverse tooth 49 is installed on the locking plate 47. The first reverse tooth 48 and the second reverse tooth 49 are in contact, and the inclination directions of the first reverse tooth 48 and the second reverse tooth 49 are opposite to the compression direction of the spring 442, and they can engage with each other. The engagement of the first reverse tooth 48 and the second reverse tooth 49 can prevent the clamping plate 441 from moving back and forth, thereby causing the clamping rod 34 to loosen. When the drive block drives the fixed plate to move, the spring is compressed and generates elastic force, and the clamping plate engages with the second reverse tooth on the locking plate through the first reverse tooth. Since the inclination directions of the first reverse tooth and the second reverse tooth are opposite to the compression direction of the spring, under the spring's rebound tendency, the contact surface of the first reverse tooth and the second reverse tooth generates a self-locking effect, preventing the clamping plate from moving in the opposite direction. Thus, the clamping rod maintains a stable clamping state under the action of the spring, avoiding clamping failure due to vibration or load changes.

[0037] Other techniques in this embodiment are based on existing technologies.

[0038] The working process of this invention is as follows: S1 Sample Installation The lower end of the metal material to be tested is fixed in the groove of the clamping seat 11 by the first clamping structure, specifically by the first clamping block 12 and the second clamping block 13 working together to clamp it. The first drive shaft 15 is rotated by the adjusting motor 14, causing the two clamping blocks to move towards each other, thereby achieving a stable clamping of the lower end of the metal material. The upper end of the metal material to be tested is placed between the clamping rods 34 of the adjusting component, and clamped and fixed by the clamping rods 34. The clamping rods 34 pass through the sliding sleeve 33, which can slide directionally along the arc-shaped limiting groove 32 of the limiting plate 31. The pressure rod 35 applies a pressing force to the clamping rods 34 from both sides to prevent them from unexpectedly loosening or shifting.

[0039] By adjusting the position of the first clamping structure, the clamping position of the lower end of the metal material to be tested can be adjusted.

[0040] S2 drive system preparation The drive motor 45 in the drive unit is started, which drives the second drive shaft 46 to rotate via the motor output shaft. The second drive shaft 46 and the drive block 42 are connected by a threaded transmission, and the drive block 42 achieves linear reciprocating motion under the guidance of the drive seat 41. When the motor rotates forward, the drive block advances in a set direction (forward / upward / downward, depending on the installation configuration); when the motor rotates in reverse, the drive block performs a reset action, thus forming a periodic reciprocating motion cycle.

[0041] When the upper end of the clamping rod 34 moves left and right within the limiting groove 32 via the sliding sleeve 33, it can also move vertically along the clamping rod 34.

[0042] During the periodic displacement of the drive block 42, the clamping connection mechanism drives the associated clamping rod 34 to move synchronously. The upper end of the clamping rod 34 is fixed to the upper end of the metal material to be tested, while the lower end is constrained within the arc-shaped limiting groove 32 by the sliding sleeve 33, allowing for controllable sliding. This motion mechanism causes the upper end of the metal material to move back and forth regularly, while the lower end remains fixed, thereby inducing periodic bending deformation of the material as a whole.

[0043] S3 Continuous Testing and Performance Evaluation The device maintains continuous operation, with the drive block continuously performing reciprocating motion, causing the metal material to withstand cyclic bending loads. After reaching a preset number of cycles, visual inspection or instrumental observation is used to check for failure phenomena such as crack initiation, plastic deformation, or complete fracture on the surface of the metal material, thereby assessing the material's fatigue life and mechanical strength characteristics. By replacing the limiting plates with different arc-shaped profiles (i.e., adjusting the spatial configuration of the arc-shaped limiting groove 32), diverse bending trajectories and acting angles can be simulated, thus enabling fatigue performance testing under multiple working conditions.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0045] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A simulation testing device for fatigue performance of metallic materials, characterized in that, Includes a base (1), on which a first driving mechanism is provided, and on which a first clamping structure is provided; a limiting plate (31) and a driving seat (41) are fixed above the base (1) and are disposed opposite to each other. The limiting plate (31) has an arc-shaped limiting groove (32), a sliding sleeve (33) is fitted in the limiting groove (32), and a clamping rod (34) is provided in the sliding sleeve (33). A second drive mechanism is installed on the drive base (41), and two opposing fixed plates are fixedly arranged on the second drive mechanism, with a spring (442) installed on at least one fixed plate. A pressure bar (35) is installed on each of the opposite ends of the spring (442) and the fixed plate, or a pressure bar (35) is installed on each of the opposite ends of the spring (442). One end of the clamping rod (34) passes through the sliding sleeve (33), and the other end is clamped between the two pressure rods (35).

2. The fatigue performance simulation testing device for metallic materials according to claim 1, characterized in that, The first drive mechanism includes an adjustment motor (14) and a first drive shaft. The power output end of the adjustment motor is connected to the first drive shaft. The surface of the first drive shaft is provided with two sections of threads with opposite directions.

3. The fatigue performance simulation testing device for metallic materials according to claim 2, characterized in that, The clamping structure includes a first clamping block (12) and a second clamping block (13) respectively disposed on the two sections of threads with opposite directions of rotation.

4. The fatigue performance simulation testing device for metallic materials according to claim 1, characterized in that, The second drive mechanism includes a drive motor (45) and a second drive shaft (46). The power output end of the drive motor (45) is connected to the second drive shaft (46). A drive block (42) is threaded onto the second drive shaft (46). The two fixing plates are mounted on the drive block (42).

5. The fatigue performance simulation testing device for metallic materials according to claim 4, characterized in that, A pressure plate (441) is provided on the spring (442), and the pressure rod (35) is connected to the spring (442) through the pressure plate (441).

6. The fatigue performance simulation testing device for metallic materials according to claim 5, characterized in that, The front end of the drive block (42) is equipped with a locking plate (47), and a second reverse tooth (49) is installed on the locking plate (47). The second reverse tooth (49) is in contact with the bottom of the pressing plate (441). The second reverse tooth (49) is an inclined tooth shape, and the inclination direction is opposite to the compression direction of the spring (442).

7. The fatigue performance simulation testing device for metallic materials according to claim 5, characterized in that, The front end of the drive block (42) is equipped with a locking plate (47), and the bottom of the pressing plate (441) is equipped with a first reverse tooth (48). The first reverse tooth (48) is in contact with the upper end face of the locking plate (47). The first reverse tooth (48) is an inclined tooth shape, and the inclination direction is opposite to the compression direction of the spring (442).

8. The fatigue performance simulation testing device for metallic materials according to claim 5, characterized in that, The front end of the drive block (42) is equipped with a locking plate (47), the bottom of the pressing plate (441) is equipped with a first reverse tooth (48), and the locking plate (47) is equipped with a second reverse tooth (49). The first reverse tooth (48) and the second reverse tooth (49) are in contact. The first reverse tooth (48) and the second reverse tooth (49) are inclined teeth, and the inclination direction is opposite to the compression direction of the spring (442).

9. The fatigue performance simulation testing device for metallic materials according to claim 1, characterized in that, The length of the pressure rod (35) is greater than the height of the limiting groove (32).

10. A testing method for the fatigue performance simulation testing device for metallic materials as described in claim 1, characterized in that, Includes the following steps: S1, the lower end of the metal material to be tested is clamped by the first clamping structure, and the upper end is clamped by the clamping rod (34); S2, the second drive mechanism drives the upper end of the clamping rod (34) to move back and forth along the limiting groove (32), thereby driving the upper end of the metal material to be tested to move back and forth, while the lower end of the clamping rod (34) remains fixed. S3. Observe the changes in the state of the metal material to be tested, and whether cracks, plastic deformation or fractures occur.

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