Stress testing device and method

Abstract

This invention discloses a stress testing device, relating to the field of fatigue testing equipment technology. It includes a test bench with a driving device and an adjusting slide. The output end of the driving device is connected to a deflection adjustment mechanism via a rotating spindle. The deflection adjustment mechanism enables a lateral displacement of the first end of the test piece relative to its second end, causing the test piece to bend. The adjusting slide includes a first slide, a second slide, and a third slide. The first slide can slide relative to the test bench in a first direction and can be locked in position. The second slide can slide relative to the first slide in a second direction and can be locked in position. The third slide can slide relative to the second slide in a third direction and can be locked in position. The first, second, and third directions are perpendicular to each other. The second slide is connected to the second end of the test piece. A stress testing method is also disclosed. Therefore, this device can improve the adjustment efficiency of the testing equipment.

Description

Technical Field

[0001] This invention relates to the field of fatigue testing equipment technology, and in particular to a stress testing device and method. Background Technology

[0002] Aircraft hydraulic conduits and connectors are critical components of aircraft hydraulic systems, responsible for transmitting high-pressure hydraulic oil and controlling vital systems such as landing gear, flaps, and brakes. Therefore, aircraft hydraulic conduits and connectors require rotational bending fatigue testing before use. With the increasing specifications of hydraulic piping components (≥... 18) With the increase in size and length, the coaxiality deviation of the hydraulic pipeline components increases after overall installation. Therefore, the requirements for the rigidity and installation accuracy of the experimental device are higher. However, most existing rotary bending fatigue testing devices can only adjust the coaxiality of the pipeline components under test in two or one of the X, Y, and Z directions. They cannot compensate for the coaxiality deviation in three-dimensional space at the same time. Operators need to repeatedly disassemble and reassemble and test multiple times to approach the ideal alignment state. The test preparation time is long and the adjustment efficiency is low. Summary of the Invention

[0003] The purpose of this invention is to provide a stress testing device and method to solve the problems existing in the prior art and improve the adjustment efficiency of the testing device.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a stress testing device, including a test bench, on which a driving device and an adjusting slide are provided. The output end of the driving device is connected to a deflection adjustment mechanism via a rotating spindle. The deflection adjustment mechanism enables a first end of the test piece to undergo lateral displacement relative to a second end, causing the test piece to bend. The adjusting slide includes a first slide, a second slide, and a third slide. The first slide is slidable relative to the test bench in a first direction and can be locked in position. The second slide is slidable relative to the first slide in a second direction and can be locked in position. The third slide is slidable relative to the second slide in a third direction and can be locked in position. The first direction, the second direction, and the third direction are perpendicular to each other. The third slide is connected to the second end of the test piece.

[0005] In some embodiments, the deflection adjustment mechanism includes an adjustment mechanism and a push block. The output end of the drive mechanism is connected to the adjustment mechanism. The push block contacts the first end of the test piece. The push block extends horizontally under the drive of the adjustment mechanism to squeeze the first end of the test piece, causing the test piece to bend and deform.

[0006] In some embodiments, a self-aligning device is also included, which is fixedly mounted on the first slide and connected to the second end of the workpiece being tested, for adjusting the workpiece being tested to coincide with the axis of the rotating spindle.

[0007] In some embodiments, the self-aligning device includes a self-aligning component and a mounting base. The mounting base is fixedly disposed on one side of the self-aligning component. The mounting base is provided with an installation port, an oil inlet, and an exhaust port. The installation port is used to connect to the second end of the test piece. The oil inlet is used to inject oil into the test piece. The exhaust port is used to discharge gas from the test piece.

[0008] In some embodiments, the self-aligning device further includes a support plate disposed on the other side of the self-aligning member, the support plate being fixedly connected to the second slide and movable relative to the first slide.

[0009] In some embodiments, a shock absorber is also included, one end of which is connected to the rotating spindle and the other end of which is connected to the deflection adjustment mechanism. The shock absorber is used to absorb and buffer the vibration and impact loads transmitted from the rotating spindle to the adjustment mechanism.

[0010] In some embodiments, the deflection adjustment mechanism is connected to a self-aligning bearing at one end near the test piece. The self-aligning bearing can be angled according to the position and orientation of the test piece so that the push block fits against the first end of the test piece through the self-aligning bearing.

[0011] In some embodiments, a base is also included, which is fixedly mounted on the test bench, and the driving device and the shock absorber are both fixedly mounted on the base.

[0012] In some embodiments, a stress testing device is provided on the test piece, the stress testing device including a circumferential stress sensing unit and an axial stress sensing unit, the circumferential stress sensing unit being used to collect the circumferential stress of the test piece, and the axial stress sensing unit being used to collect the axial stress of the test piece.

[0013] The present invention also provides a stress testing method based on the stress testing device described in any one of the above claims, characterized in that it includes the following steps: The first end of the test piece is connected to the deflection adjustment mechanism, and the second end of the test piece is connected to the adjustment slide. The position of the test piece is adjusted in the first direction, the second direction, and the third direction to make the axis of the test piece coincide with the axis of the rotating spindle; Test the tensile stress of the test piece; Bending stress is applied to the test piece through the deflection adjustment mechanism; The drive device is started, and the drive device drives the deflection adjustment mechanism to rotate through the rotating spindle, so that the test piece is subjected to bending fatigue test under bending stress.

[0014] The present invention achieves the following technical effects compared to the prior art: The stress testing device provided by this invention drives a deflection adjustment mechanism via a rotating spindle through a drive device. The deflection adjustment mechanism laterally and horizontally presses the first end of the test piece, forcing the test piece to bend. Simultaneously, by utilizing the independent sliding and locking functions of the first, second, and third slides in three mutually perpendicular directions, the test piece can be precisely positioned and fixed at any location in space. This allows for flexible adjustment of the centering position of the test piece, adapting to the testing requirements of test pieces of different specifications, and ensuring the accuracy of the applied bending stress and the reliability of the test results. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the stress testing device in one embodiment of the example; Figure 2 This is a side view of a stress testing device in one embodiment of the example.

[0017] Wherein: 1-Test bench; 2-Base; 3-Drive device; 4-Coupling; 5-Anti-vibration component; 6-Deflection adjustment mechanism; 7-Self-aligning bearing; 8-First slide; 9-Second slide; 10-Third slide; 11-Support plate; 12-Self-aligning component; 13-Mounting base; 14-Stress test piece; 15-Test piece; 16-Adapter. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1 This invention provides a stress testing device, such as... Figure 1-2 As shown, the test bench 1 includes a drive device 3 and an adjusting slide. The output end of the drive device 3 is connected to the deflection adjustment mechanism 6 via a rotating spindle. The deflection adjustment mechanism 6 can cause the first end of the test piece 15 to have a lateral displacement relative to the second end, and cause the test piece 15 to bend. The adjusting slide includes a first slide 8, a second slide 9, and a third slide 10. The first slide 8 can slide relative to the test bench 1 in a first direction and can be locked in position. The second slide 9 can slide relative to the first slide 8 in a second direction and can be locked in position. The third slide 10 can slide relative to the second slide 9 in a third direction and can be locked in position. The third direction is perpendicular to each other, and the third slide 10 is connected to the second end of the test piece 15. In this embodiment, the stress testing device drives the deflection adjustment mechanism 6 through the rotating spindle via the drive device 3, so that the deflection adjustment mechanism 6 presses the first end of the test piece 15 from the side horizontally, forcing the test piece 15 to bend and deform. At the same time, by utilizing the independent sliding and locking functions of the first slide 8, the second slide 9 and the third slide 10 in three mutually perpendicular directions, the test piece 15 can be accurately positioned and fixed at any position in space. This allows for flexible adjustment of the centering position of the test piece 15 to adapt to the testing requirements of test pieces 15 of different specifications, ensuring the accuracy of the bending stress application and the reliability of the test results.

[0021] In some embodiments of this example, the deflection adjustment mechanism 6 includes an adjustment mechanism and a push block. The output end of the drive device 3 is connected to the adjustment mechanism. The push block contacts the first end of the test piece 15. Driven by the adjustment mechanism, the push block extends horizontally to press the first end of the test piece 15, causing the test piece 15 to bend and deform. The drive device 3 drives the adjustment mechanism to rotate. The rotation of the adjustment mechanism pushes the push block to make horizontal radial reciprocating motion in a fixed linear guide rail through a connecting rod. The circular motion of the adjustment mechanism is decomposed into the linear displacement of the push block. By adjusting the effective arm length of the adjustment mechanism, the stroke and thrust of the push block can be changed to achieve precise adjustment of the deflection. Therefore, the deflection adjustment mechanism 6 can convert the rotational motion of the drive device 3 into the horizontal radial linear motion of the push block, so that the push block presses the first end of the test piece 15 horizontally from the side to produce bending deformation, realizing rotational input and linear output. The horizontal lateral pressing makes the force direction singular and clear, simplifying the bending stress analysis and calculation, and has strong versatility and adaptability.

[0022] In some embodiments of this example, the stress testing device further includes a self-aligning device, which is fixedly mounted on the first slide 8 and connected to the second end of the test piece 15. The self-aligning device is used to adjust the alignment of the test piece 15 with the axis of the rotating spindle. By adjusting the position of the slide 8, the second end of the test piece 15 can be adjusted in space, thereby aligning the axis of the test piece 15 with the axis of the rotating spindle. This ensures the coaxiality between the test piece 15 and the deflection adjustment mechanism 6, avoiding eccentric loading and additional torque caused by axis misalignment. It ensures that the pressing force applied by the push block to the test piece 15 acts in a predetermined direction, causing the test piece 15 to undergo pure bending deformation rather than a combination of bending and torsion deformation. This improves the accuracy of bending stress application and the reliability of the test results, while simplifying the clamping and positioning operation of the test piece 15 and reducing the skill requirements for operators.

[0023] In some embodiments of this example, the self-aligning device includes a self-aligning component 12 and a mounting base 13. The mounting base 13 is fixedly disposed on one side of the self-aligning component 12. The mounting base 13 is provided with an installation port, an oil inlet, and an exhaust port. The installation port is used to connect to the second end of the test piece 15, the oil inlet is used to inject oil into the test piece 15, and the exhaust port is used to expel gas from the test piece 15. The self-aligning device adopts an integrated design of the self-aligning component 12 and the mounting base 13. The mounting base 13 is fixedly disposed on one side of the self-aligning component 12 and is provided with an installation port, an oil inlet, and an exhaust port, so that the connection positioning, oil injection, and exhaust functions of the second end of the test piece 15 are highly integrated into one unit. The installation port enables the rapid connection of the test piece 15. The quick-clamping and fixing mechanism injects oil into the test piece 15 through the oil inlet and promptly vents the gas inside the cavity through the exhaust port, avoiding air resistance and uneven oil filling. This ensures that the oil fully fills all the internal cavities of the test piece 15. At the same time, the self-aligning component 12 can adaptively adjust its angle according to the actual position and posture of the test piece 15, automatically compensating for clamping deviations and ensuring that the axis of the test piece 15 is precisely aligned with the axis of the rotating spindle. Thus, the internal oil injection operation is completed while the test piece 15 is subjected to bending stress, realizing the simultaneous occurrence of mechanical loading and medium injection. This simplifies the testing process, improves work efficiency, and ensures the stability of the test state and the accuracy of the data.

[0024] In some embodiments of this example, the self-aligning device further includes a support plate 11, which is disposed on the other side of the self-aligning component 12. The support plate 11 is fixedly connected to the third slide table 10 and can move relative to the first slide table 8. The self-aligning component 12 is located between the support plate 11 and the mounting base 13. The fixed connection between the support plate 11 and the second slide table 10 realizes the overall position adjustment of the self-aligning device in the second direction. At the same time, by utilizing the movement function of the support plate 11 relative to the first slide table 8, the self-aligning component 12 can be synchronously displaced with the second slide table 9 in the second direction. Thus, after the test piece 15 is clamped and positioned, the sliding of the second slide table 9 drives the support plate 11 and the self-aligning component 12 to move as a whole, realizing the fine adjustment and locking of the lateral position of the test piece 15, ensuring the precise alignment of the axis of the test piece 15 with the axis of the rotating spindle. Moreover, the support plate 11 provides a stable installation reference and rigid support for the self-aligning component 12, avoiding deformation or displacement of the self-aligning component 12 under stress, and improving the load-bearing capacity and positional stability of the self-aligning device.

[0025] In some embodiments of this example, the stress testing device further includes a shock absorber 5. One end of the shock absorber 5 is connected to the rotating spindle, and the other end is connected to the deflection adjustment mechanism 6. The shock absorber 5 is used to absorb and buffer the vibration and impact loads transmitted from the rotating spindle to the adjustment mechanism. The shock absorber 5 is located in the middle of the power transmission path, which can effectively absorb and buffer the vibration and impact loads transmitted from the rotating spindle to the adjustment mechanism, isolate the periodic vibrations generated during the operation of the drive device and the impact fluctuations at the start and stop, avoid the vibration and impact being directly transmitted to the contact interface between the push block and the test piece 15, prevent the extrusion pressure fluctuations and bending stress instability caused by vibration interference, ensure that the bending load applied by the push block to the test piece 15 is stable, continuous, precise and controllable, and at the same time reduce the wear of the internal transmission pairs of the adjustment mechanism by vibration, extend the service life of the deflection adjustment mechanism 6, and improve the accuracy and repeatability of the test data.

[0026] The anti-vibration component 5 typically employs an elastic or flexible coupling structure (such as a swivel coupling, diaphragm coupling, or rubber buffer coupling). It rotates itself, following the main shaft, but absorbs and dampens vibrations during rotation through internal elastic elements (rubber pads, metal diaphragms, springs, etc.). The motor shaft is rigidly connected to one end of the anti-vibration component, while the other end is connected to the input shaft of the deflection adjustment mechanism 6. While transmitting torque, the anti-vibration component uses elastic deformation to isolate the motor's start-stop impact and running vibrations, ensuring a smooth rotary input for the deflection adjustment mechanism and thus guaranteeing a stable and unfluctuating radial thrust output by the push block.

[0027] In some embodiments of this example, a self-aligning bearing 7 is connected to one end of the deflection adjustment mechanism 6 near the test piece. The self-aligning bearing 7 can adjust its angle according to the position and orientation of the test piece 14, so that the push block is in contact with the first end of the test piece 15 through the self-aligning bearing 7. The self-aligning bearing 7 is disposed at the end of the deflection adjustment mechanism 5 near the test piece 15 and between the push block and the test piece 15. It can adaptively adjust its angle according to the actual position and surface orientation of the first end of the test piece 15, and automatically compensate for the positional deviation between the test piece 15 and the push block. The self-aligning bearing 7 ensures that the push block makes full contact with the first end side of the test piece 15 through the self-aligning bearing 7, transforming the original rigid point contact or line contact into surface contact. This ensures that the compressive force is evenly transmitted to the test piece 15 along the contact surface, avoiding local stress concentration and eccentric loading caused by poor contact. It also prevents surface indentation damage and uneven bending deformation of the test piece 15. At the same time, the adaptive adjustment of the self-aligning bearing 7 reduces the stringent requirements for the clamping and positioning accuracy of the test piece 15, simplifies the clamping operation process, and improves the testing efficiency and the reliability of the results.

[0028] In some embodiments of this example, the stress testing device further includes a base 2, which is fixedly mounted on the test bench 1. The drive device 3 and the anti-vibration component 4 are both fixedly mounted on the base 2. The base 2 is fixedly mounted on the test bench 1, and the drive device 3 is fixed to the anti-vibration component 5 via a coupling 4. By concentrating the drive device 3, coupling 4, and anti-vibration component 5 on the rigid platform of the base 2, the overall mass of the lower part of the device is increased, effectively lowering the center of gravity of the whole machine. This improves the anti-overturning stability and dynamic balance performance of the stress testing device during the application of load, and avoids the upper part of the device from shaking or displacing due to the reaction force generated when the push block horizontally squeezes the test piece 15. At the same time, the base 2 provides a unified installation reference for the drive device 3 and the anti-vibration component 5, ensuring the coaxiality and relative position accuracy between the rotating spindle and the deflection adjustment mechanism 6, reducing the gap and flexible deformation in the vibration transmission path, and making the power transmission more stable and reliable.

[0029] In some embodiments of this example, a stress testing element 14 is provided on the test piece 15. The stress testing element 14 includes a circumferential stress sensing unit and an axial stress sensing unit. The circumferential stress sensing unit is used to collect the circumferential stress of the test piece 15, and the axial stress sensing unit is used to collect the axial stress of the test piece 15. The stress testing element 14 is provided on the test piece 15 and includes a circumferential stress sensing unit and an axial stress sensing unit. By arranging stress detection units in two directions simultaneously at the same position on the test piece 15, the simultaneous acquisition and real-time monitoring of circumferential and axial stress are realized. This allows for the comprehensive acquisition of stress response data in different directions of the test piece 15 during bending deformation, revealing the anisotropic characteristics and coupling relationship of stress distribution. This avoids information loss and judgment bias caused by single-direction measurement. At the same time, the dual-unit integrated design reduces the number of sensors and installation procedures, simplifies the wiring structure and data acquisition process of the test system, improves test efficiency and data synchronization, and provides complete and accurate stress field information for the mechanical performance analysis and structural optimization design of the test piece 15.

[0030] Example 2 The present invention also provides a stress testing method based on the stress testing device of Embodiment 1, comprising the following steps: S1. First, seal the tubular connector and adapter 16 to both ends of the test piece 15, and then seal the tubular connector on the test piece 15 to the mounting base 13 to complete the installation of the test piece 15. S2. Then install two stress test pieces 14 onto one side and the top of the test piece 15, then connect the oil inlet to the external oil pump, and connect the pressure sensor through the pressure sensor connection port. S3. Perform a stamping test on the test piece 15. Fill the test piece 15 with oil using an external oil pump. Stop filling the test piece 15 with oil when the pressure sensor connected to the pressure sensor port detects the corresponding value. Detect the corresponding value of the test piece 15 using the stress test piece 14 to obtain the first set of values, namely the tensile stress S. p ; S4. Then, one end of the adapter 16 on the test piece 15 is inserted into the deflection adjustment mechanism 6. When inserting one end of the adapter 16 on the test piece 15 into the deflection adjustment mechanism 6, the position of the test piece 15 needs to be adjusted. During adjustment, the second adjusting screw rotates to drive the second slide 10 to move in the second direction, thereby adjusting the position of the test piece 15 in the second direction. After adjusting to the corresponding position, it is locked with bolts. Then, the third adjusting screw drives the third slide 9 to move up and down, and the third slide 9 drives the test piece 15 to move in the third direction, thereby adjusting the position of the test piece 15 in the third direction. During adjustment, a dial indicator is used to check to determine that the axis of the test piece 15 and the axis of the deflection adjustment mechanism 6 are on the same straight line. Then, the first adjusting screw drives the first slide 8 to move, and the first slide 8 drives the test piece 15 to move, thereby inserting one end of the adapter 16 on the test piece 15 into the deflection adjustment mechanism 6. When adapter 16 enters the self-aligning bearing 7, the strain deviation measured by stress test piece 14 should not exceed ±20. If the value is higher than 20 during the process of entering... After pushing out, gently tap the tailstock, then insert the self-aligning bearing 7 until the collected strain deviation is less than ±20. ; S5. The drive unit 3 outputs rotational motion, which is transmitted to the deflection adjustment mechanism 6 via the rotating spindle. The rotating spindle is connected to the adjustment mechanism through the anti-vibration component 5. The anti-vibration component 5 absorbs and buffers the vibration and impact loads during the transmission process to ensure the smoothness of power transmission.

[0031] S6. The rotational motion is converted into the horizontal radial displacement of the push block through the internal threaded pair, so that the push block extends horizontally towards the test piece 15. The end of the push block near the test piece 15 is connected to a self-aligning bearing 7. The self-aligning bearing 7 can adaptively adjust its angle according to the actual position and surface posture of the first end of the test piece 15, automatically compensating for the positional and angular deviations between the test piece 15 and the push block, so that the self-aligning bearing 7 and the side of the first end of the test piece 15 are fully in contact, ensuring that the extrusion force is transmitted evenly and avoiding local stress concentration caused by point contact or line contact.

[0032] S7. The pusher continues to extend horizontally and presses the side of the first end of the test piece 15 from the side through the self-aligning bearing 7. Since the second end of the test piece 15 is fixed and constrained by the adjusting slide, the test piece 15 undergoes lateral bending deformation under the action of horizontal extrusion force. The first end shifts in the direction of the pusher's extension, and the test piece 15 as a whole forms a bent state.

[0033] S8. During the lateral bending deformation of the test piece 15, the material fibers on one side of the neutral axis are stretched and shortened on the other side, thereby generating bending stress linearly distributed along the cross-sectional height inside the test piece 15. The stress is zero at the neutral axis position, and the stress increases with distance from the neutral axis. The maximum tensile stress and the maximum compressive stress appear on the convex and concave surfaces of the test piece 15 during bending, respectively.

[0034] S9. Precisely adjust the horizontal extension displacement of the pusher block to control the lateral deflection of the test piece 15. According to the bending theory in mechanics of materials, the bending stress of the test piece 15 is directly proportional to its deflection. Therefore, by precisely controlling the displacement of the pusher block, the internal bending stress of the test piece 15 can be quantitatively applied and adjusted. The corresponding values ​​of the test piece 15 are detected by the stress test piece 14, thereby obtaining the second set of values, namely the bending stress S. S10. Refill the test piece 15 with oil using an external oil pump. Stop filling the test piece 15 with oil when the pressure sensor connected to the pressure sensor port detects the corresponding value. Detect the corresponding value of the test piece 15 using the stress test piece 14 to obtain the third set of values. Calculate the bending fatigue stress S of the test piece 15 based on these values. f The calculated bending stress has an error of less than 5% compared to the specified value.

[0035] During calculation, the maximum permissible bending fatigue stress of the tested component 15 is determined by the combined stress S. f The combined stress consists of tensile stress S p It consists of bending stress S, i.e., S f = S + S p ; Generally, the combined stress is taken as σ according to the bending strength design requirements of the conduit and connectors. b / 4. If there are special requirements, they can be specified separately.

[0036] Tensile stress S p It is caused by internal pressure, and its magnitude is related to the internal pressure and the inner and outer diameters of the tested part 15. Tensile stress can be measured by a strain gauge or calculated. If a measurement method is used, at least one stress test piece 14 should be attached to the test piece 15 in both the axial and circumferential directions, and the stress-strain formula should be used for calculation (based on the first set of data): formula In the formula: —Axial strain obtained by measurement; —Circumferential strain obtained by measurement; E – Elastic modulus of the conduit material; μ—Poisson's ratio of the conduit material; If a calculation method is used, the following formula for axial tensile stress should be applied: S p = P·d 2 / (D 2 -d 2 ) In the formula: p — internal pressure of the conduit, Pa; D – Outer diameter of the catheter, mm; d——inner diameter of the catheter, mm.

[0037] The error between the tensile stress obtained from strain measurement and the tensile stress obtained by calculation is no more than 5%.

[0038] S11. After depressurization, turn off the strain gauge; Turn on the strain gauge and zero it. The formula for calculating bending stress is as follows: Bending stress is generated by the bending applied externally to the test piece 15, and its magnitude is determined by... Sure.

[0039] The bending stress is calculated by collecting the maximum strain, using the following formula: E=σ / ε; the error between the applied bending stress and the calculated bending stress should not exceed ±1%. Set system pressure, pressure replenishment limit, and leakage shutdown limit; The test is conducted by starting the rotation at a specified constant speed until the specified number of cycles or failure occurs.

[0040] Where: σ is stress; ε is strain; σ b Tensile strength; E (elastic modulus); S (tensile strength) f Combined stress; S bending stress; S p Tensile stress.

[0041] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A stress testing device, comprising a test bench, characterized in that: The test bench is equipped with a drive device and an adjustable slide. The output end of the drive device is connected to the deflection adjustment mechanism via a rotating spindle. The deflection adjustment mechanism can cause the first end of the test piece to have a lateral displacement relative to the second end and cause the test piece to bend. The adjusting slide includes a first slide, a second slide, and a third slide. The first slide is slidable relative to the test bench in a first direction and can be locked in position. The second slide can slide relative to the first slide in the second direction and can lock its position. The third slide can slide relative to the second slide in a third direction and can lock its position. The first direction, the second direction and the third direction are perpendicular to each other. The second slide is connected to the second end of the test piece.

2. The stress testing device according to claim 1, characterized in that: The deflection adjustment mechanism includes an adjustment mechanism and a push block. The output end of the drive mechanism is connected to the adjustment mechanism. The push block contacts the first end of the test piece. The push block extends horizontally under the drive of the adjustment mechanism to squeeze the first end of the test piece, so as to cause the test piece to bend and deform.

3. The stress testing device according to claim 1, characterized in that: It also includes a self-aligning device, which is fixedly mounted on the first slide and connected to the second end of the workpiece being tested, for adjusting the workpiece being tested to coincide with the axis of the rotating spindle.

4. The stress testing device according to claim 3, characterized in that: The self-aligning device includes a self-aligning component and a mounting base. The mounting base is fixedly disposed on one side of the self-aligning component. The mounting base is provided with an installation port, an oil inlet, and an exhaust port. The installation port is used to connect to the second end of the test piece. The oil inlet is used to inject oil into the test piece. The exhaust port is used to discharge gas from the test piece.

5. The stress testing device according to claim 4, characterized in that: The self-aligning device further includes a support plate, which is disposed on the other side of the self-aligning component. The support plate is fixedly connected to the second slide and can move relative to the first slide.

6. The stress testing device according to claim 1, characterized in that: It also includes a shock absorber, one end of which is connected to the rotating spindle and the other end of which is connected to the deflection adjustment mechanism. The shock absorber is used to absorb and buffer the vibration and impact loads transmitted from the rotating spindle to the adjustment mechanism.

7. The stress testing device according to claim 2, characterized in that: The deflection adjustment mechanism is connected to a self-aligning bearing at one end near the test piece. The self-aligning bearing can adjust the angle according to the position and posture of the test piece so that the push block fits against the first end of the test piece through the self-aligning bearing.

8. The stress testing device according to claim 6, characterized in that: It also includes a base, which is fixedly mounted on the test bench, and the driving device and the anti-vibration component are both fixedly mounted on the base.

9. The stress testing device according to claim 1, characterized in that: A stress testing device is provided on the test piece. The stress testing device includes a circumferential stress sensing unit and an axial stress sensing unit. The circumferential stress sensing unit is used to collect the circumferential stress of the test piece, and the axial stress sensing unit is used to collect the axial stress of the test piece.

10. A stress testing method based on the stress testing device according to any one of claims 1-9, characterized in that: Includes the following steps The first end of the part to be tested is connected to the deflection adjustment mechanism, and the second end of the part to be tested is connected to the adjustment slide. The position of the test piece is adjusted in the first direction, the second direction, and the third direction to make the axis of the test piece coincide with the axis of the rotating spindle; Test the tensile stress of the test piece; Bending stress is applied to the test piece through the deflection adjustment mechanism; The drive device is started, and the drive device drives the deflection adjustment mechanism to rotate through the rotating spindle, so that the test piece is subjected to bending fatigue test under bending stress.

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