A method for testing the stiffness and fatigue of a composite stabilizer bar

Abstract

The present application relates to a kind of composite material stabilizer rigidity and fatigue test method, comprising the following steps: stabilizer is placed on base plate, and stabilizer is positioned by rubber bushing;After adjusting in place, stabilizer is fixed on rack by end clamp or joint;Test rack is connected with test host;Start test host, servo motor is controlled by controller, and rated load is applied to test joint, then it is transmitted to stabilizer by test rack, and displacement and load in loading process are recorded;Stabilizer rigidity value is calculated by formula K=F / S;Or the frequency of host test joint reciprocating motion is set by controller, and the number of final stabilizer periodic motion is recorded;The number of final stabilizer periodic motion is recorded as T, and it is the fatigue life of stabilizer.The present application solves the problems that stiffness and fatigue performance cannot be tested simultaneously in prior art, and structure is large and operation is complex.

Description

TECHNICAL FIELD

[0001] The present application relates to a performance test method of an automobile part, in particular to a method for testing the rigidity and fatigue of a composite stabilizer bar, and belongs to the technical field of material performance detection. BACKGROUND

[0002] When producing automobile parts, a series of tests need to be performed on the produced samples to meet the performance requirements of the parts. Among them, the rigidity and fatigue of the parts are the most important test items, which are used to detect the torsion resistance and fatigue resistance of the parts.

[0003] The stabilizer bar, also known as the anti-roll bar or balance bar, is an auxiliary elastic element in the suspension of an automobile. The existing technology uses a large-sized device to test the rigidity and fatigue of the stabilizer bar, which is complex in mechanism and operation and inconvenient to use. Moreover, the rigidity and fatigue need to be tested by different devices, which consumes a large amount of resources. In addition, the performance of the composite stabilizer bar is damaged, and different stabilizer bar joints cannot be tested.

[0004] Therefore, in order to solve the above technical problems, it is necessary to provide an innovative method for testing the rigidity and fatigue of a composite stabilizer bar to overcome the defects in the prior art. SUMMARY

[0005] The present application aims to provide a method for testing the rigidity and fatigue of a composite stabilizer bar to solve the problems of the prior art test device, such as being unable to test the rigidity and fatigue performance at the same time, being large in size, being complex in operation, and being damaged to the stabilizer bar.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: a method for testing the rigidity and fatigue of a composite stabilizer bar, which is used to test the rigidity and fatigue of the stabilizer bar, adopts a stabilizer bar rigidity and fatigue testing device, which includes a test host, a test bench, and a control cabinet. The test bench is connected to the test host through a universal joint. The control cabinet and the test host are connected by signals and can control the movement of the test host.

[0007] When testing the rigidity of the stabilizer bar, the following steps are included:

[0008] 1-1), place the stabilizer bar on the bottom plate and position it through the rubber bushing;

[0009] 1-2), after adjusting to the appropriate position, fix the stabilizer bar on the bench through the end clamp or joint;

[0010] 1-3), connect the test bench to the test host;

[0011] 1-4), start the test host, control the servo motor through the controller, apply the rated load to the test joint, then transmit the load to the stabilizer through the test bench, and record the displacement and load during the loading process;

[0012] 1-5), the rigidity value of the stabilizer is calculated through the formula K=F / S, wherein K is the linear rigidity value of the stabilizer, F is the load applied by the host, and S is the displacement amount of the end of the stabilizer;

[0013] When the fatigue test is performed on the stabilizer, the following steps are included:

[0014] 2-1), the stabilizer is placed on the bottom plate, and the stabilizer is positioned through the rubber bushing;

[0015] 2-2), after being positioned at a suitable position, the stabilizer is fixed on the test bench through the end clamp or joint;

[0016] 2-3), the test bench is connected with the test host;

[0017] 2-4), the host is started, the frequency of the reciprocating motion of the test joint of the host is set through the controller, and the number of cycles of the final stabilizer is recorded;

[0018] 2-5), the number of cycles of the final stabilizer is recorded as T, that is, the fatigue life of the stabilizer.

[0019] The method for testing the rigidity and fatigue of the composite stabilizer further comprises that the test host comprises an upper cross beam, a middle cross beam, a base, a workbench and a servo motor; wherein the upper cross beam and the workbench are tightly connected together through a plurality of columns; the bottom of the column is fixed on the base; a vertically arranged ball screw is pivotally connected to the base; the middle cross beam is matched with the ball screw and is driven to move up and down through the rotation of the ball screw; a test joint is arranged on the middle cross beam; a sensor is arranged on the upper portion of the test joint; the servo motor is arranged on the base and drives the rotation of the ball screw through a transmission device;

[0020] The output signal of the control cabinet controls the servo motor, the motor drives the rotation of the ball screw, the ball screw drives the up and down movement of the middle cross beam, the linkage swing rod moves up and down, and then the stabilizer moves up and down through the connected clamp or joint, and the frequency of the output signal of the controller is set to repeatedly load the stabilizer.

[0021] The method for testing the rigidity and fatigue of the composite stabilizer further comprises that the transmission device is a synchronous belt reducer; the sensor adopts a CZL-L-1000 type pressure sensor and a KS15-400-01-L type displacement sensor, and the range is 1000KN and 1000mm respectively.

[0022] The method for testing the rigidity and fatigue of the composite stabilizer bar of the application further comprises a swing bar, a support frame, a clamp, a base plate and a rubber bushing; the swing bar is connected to the test joint of the middle cross beam through a universal joint; the upper part of the support frame is fastened to the swing bar through a pin shaft, and the bottom part is welded to the base plate; the rubber bushing connects the stabilizer bar to the base plate through a bolt, so that the stabilizer bar is axially positioned; the base plate is fixed to the workbench; the lower part of each end of the swing bar is also provided with a universal joint, and the lower universal joint is connected to the stabilizer bar through a clamp or a joint.

[0023] The method for testing the rigidity and fatigue of the composite stabilizer bar of the application further comprises that the clamp adopts a symmetrical semicircular structure, and the two sides are fastened through a bolt and a nut to clamp the stabilizer bar.

[0024] The method for testing the rigidity and fatigue of the composite stabilizer bar of the application further comprises that the universal joint is specifically a double-joint universal joint; the swing bar adopts a hollow aluminum alloy swing bar, the cross section of which is in a concave structure, and the universal joint can slide in the concave groove.

[0025] The method for testing the rigidity and fatigue of the composite stabilizer bar of the application further comprises that the joint is provided with a corresponding connecting hole at the connecting position of the stabilizer bar according to the diameter of the rod body, a pin hole with a corresponding size of the universal joint is formed at the other end of the joint; before connection, the surface of the joint at the connecting position of the stabilizer bar is subjected to plasma surface treatment, and then 3MDP460 structural adhesive is applied; after the joint and the end of the composite stabilizer bar are solidly connected, the other end of the joint is fixed through pin connection with the universal joint.

[0026] The method for testing the rigidity and fatigue of the composite stabilizer bar of the application further comprises that the joint is provided with a corresponding connecting hole with a certain length at the connecting position of the stabilizer bar according to the diameter of the rod body, and then a threaded hole with a corresponding size of the metal connecting piece is formed at the other end; before connection, the front connecting hole is subjected to plasma treatment, and then 3MDP460 structural adhesive is applied; after the joint and the stabilizer bar are solidly connected, the metal connecting piece and the universal joint are connected through pin connection.

[0027] The method for testing the rigidity and fatigue of the composite stabilizer bar of the application further comprises that the joint adopts a U-shaped structure, the thickness of the joint is greater than the thickness of the hollow composite stabilizer bar, and connecting holes corresponding to the metal connecting piece are formed at both sides of the joint; before connection, the surface of the joint is pretreated, and then 3MDP460 structural adhesive is applied at the connecting hole; finally, the metal connecting piece and the universal joint are connected through pin connection.

[0028] The method of the composite material stabilizer rigidity and fatigue test also has the following: the test bench carries out load analysis before the test: according to the load condition of the stabilizer, stress analysis is carried out in the finite element abaqus, the position of the end clamp at the maximum stress position of the bench during work is calculated, and the maximum stress is less than the yield stress of the clamp.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] 1. The test device adopted by the present application can not only test the rigidity of the stabilizer, but also test the fatigue resistance of the stabilizer, thereby reducing the number of detection equipment; at the same time, the test precision is higher, and the load can be applied at one end to ensure that the forces at both ends of the stabilizer are balanced.

[0031] 2. The method of the composite material stabilizer rigidity and fatigue test can stably clamp the stabilizer during the test, and does not damage the performance of the stabilizer.

[0032] 3. The test bench of the present application uses hollow aluminum alloy, which not only meets the strength requirement of the test, but also is light in weight and small in size, thereby saving resources; the swing lever adopts a concave structure to meet the measurement of stabilizers of various sizes.

[0033] 4. The present application adopts different clamps and joints for different composite material stabilizers to meet the test of stabilizers of different structures. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a general schematic view of the stabilizer rigidity and fatigue test device of the present application.

[0035] Figure 2 It is a structure schematic view of the test host in Figure 1

[0036] Figure 3 It is a structure schematic view of the test bench in Figure 1

[0037] Figure 4 It is an assembly schematic view of the stabilizer and the clamp.

[0038] Figure 5-1 and Figure 5-2 It is a structure schematic view of the clamp in Figure 4

[0039] Figure 6 It is an assembly schematic view of the stabilizer and the joint.

[0040] Figure 7 It is a structure schematic view of the joint in Figure 6 ​​​​

[0041] Figure 8 is an assembly view of the stabilizer bar and another joint.

[0042] Figure 9 is a structure view of the joint in Figure 8

[0043] Figure 10 is an assembly view of the stabilizer bar and the composite joint.

[0044] Figure 11 is a structure view of the joint in Figure 10

[0045] Figure 12 is a perspective view of the metal connector.

[0046] Figure 13 is a perspective view of the swing bar.

[0047] Figure 14 is a perspective view of the rubber bushing. [DETAILED DESCRIPTION]

[0048] Referring to the drawings, the composite stabilizer bar rigidity and fatigue testing device of the present application is shown in the accompanying drawings, which is composed of a testing host, a test bench and a control cabinet. Figure 1 Figure 14 The composite stabilizer bar rigidity and fatigue testing device of the present application is shown in the accompanying drawings, which is composed of a testing host, a test bench and a control cabinet.

[0049] The testing host is of a frame structure, which not only ensures the sufficient rigidity of the frame, but also realizes the efficient and stable transmission. The testing host is composed of an upper cross beam 10, a middle cross beam 1, a base 9, a workbench 6 and a servo motor 8. The upper cross beam 10 and the workbench 6 are fastened together by a plurality of vertical columns 5, and in the embodiment, the vertical columns 5 are specifically provided with four vertical columns. The bottom of the vertical column 5 is fixed on the base 9.

[0050] Further, the base 9 is pivotally connected with a vertically arranged ball screw 4. The middle cross beam 1 is horizontally arranged, and is provided with a nut. The nut and the ball screw 4 are matched, and the middle cross beam 1 is driven to move up and down by the rotation of the ball screw 4. The ball screw and the nut are matched to eliminate the gap structure, and greatly improve the transmission accuracy of the whole machine.

[0051] The middle cross beam 1 is provided with a testing joint 2, which is linked with the middle cross beam 1. The upper part of the testing joint 2 is provided with a sensor 3. The sensor 3 is a CZL-L-1000 type pressure sensor and a KS15-400-01-L type displacement sensor, and the measuring range is 1000KN and 1000mm respectively. The measuring range is increased, and the accuracy is also high.

[0052] ​​​The servo motor 8 is installed on the base 9, which drives the ball screw 4 to rotate through the transmission device 7. The transmission device 7 is a synchronous belt reducer.

[0053] The related parameters of the test host are summarized as follows:

[0054]

[0055] Further, the test bench is connected with the test host through the universal joint 18, which is composed of the swing rod 11, the support frame 12, the clamp 13, the bottom plate 14 and the rubber bushing 15. The swing rod 11 is connected to the test joint 2 of the middle cross beam 1 through the universal joint 18. The upper part of the support frame 12 is fastened and connected to the swing rod 11 through the pin shaft, and the bottom is welded and fixed on the bottom plate 14, which provides sufficient strength support. The rubber bushing 15 connects the stabilizing rod 19 to the bottom plate 14 through the bolt, so that the stabilizing rod 19 is axially positioned. The rubber of the rubber bushing 15 causes little damage to the composite rod body, ensures the performance of the rod body, the inner layer of the bushing is connected through a circular hole slightly smaller than the outer diameter of the rod body, which positions and limits the rod body, the outer layer is fixed on the bottom plate through the metal clamping piece and the bolt and nut at both ends, which strengthens the fixation of the rod body. The bottom plate 14 is fixed on the workbench 6 through the bolt 16.

[0056] Further, the lower part of the swing rod 11 at both ends is also provided with the universal joint 18, and the lower universal joint 18 is connected with the stabilizing rod 19 through the clamp or joint. The universal joint 18 is a double-joint universal joint, which ensures the freedom of the stabilizing rod during measurement, so that the stabilizing rod moves according to the actual motion trajectory, increases the outer diameter while keeping the inner diameter unchanged, improves the strength of the universal joint, and avoids damage during measurement. The swing rod 11 is a hollow aluminum alloy swing rod 11, which ensures the strength of the test bench while reducing the weight. The cross section of the swing rod 11 is concave, and the universal joint 18 can slide in the groove.

[0057] As shown in the description accompanying drawings Figure 4 , accompanying drawings Figure 5-1 and 5-2 , the clamp 13 adopts a symmetrical semi-arc structure, and the two sides are connected and fastened through the bolt and nut to clamp and fasten the stabilizing rod 19, which also avoids damaging the performance of the composite stabilizing rod by drilling. The other end of the clamp is fixed with the universal joint 18 through the pin connection.

[0058] As shown in the description accompanying drawings Figure 6 and 7As shown in the drawings, it is the first embodiment of the joint 20, which connects the stabilizer bar 19 at the corresponding connecting hole according to the diameter of the shaft, and the pin hole of the corresponding size of the universal joint 18 is opened at the other end of the joint. Before connection, the surface of the joint 20 and the stabilizer bar 19 is treated by plasma surface treatment, and then 3MDP460 structural adhesive is applied. After the joint 20 and the composite stabilizer bar 19 are solidified and connected, the other end of the joint 20 is connected with the universal joint 18 through the pin to fix, which ensures the reliability of the connection between the stabilizer bar and the test bench.

[0059] As shown in the drawings, it is the first embodiment of the joint 20, which connects the stabilizer bar 19 at the corresponding connecting hole according to the diameter of the shaft, and the pin hole of the corresponding size of the universal joint 18 is opened at the other end of the joint. Before connection, the surface of the joint 20 and the stabilizer bar 19 is treated by plasma surface treatment, and then 3MDP460 structural adhesive is applied. After the joint 20 and the composite stabilizer bar 19 are solidified and connected, the other end of the joint 20 is connected with the universal joint 18 through the pin to fix, which ensures the reliability of the connection between the stabilizer bar and the test bench. Figure 8 9 As shown in the drawings, it is the second embodiment of the joint 21, which is connected with the stabilizer bar 19 at the corresponding connecting hole according to the diameter of the shaft, and then the threaded hole of the corresponding size of the metal connecting piece 23 is opened at the other end. Before connection, the connecting hole is treated by plasma, and then 3MDP460 structural adhesive is applied. The adhesive expands when it is solidified, which can make the connection better and the adhesive has a larger breaking strain, can bear higher fatigue limit stress, increase the fatigue life, and improve the reliability of the joint and the composite stabilizer bar. After the joint 21 and the stabilizer bar 19 are solidified and connected, the metal connecting piece 23 is connected with the universal joint 18 through the pin, which ensures the reliability of the connection between the stabilizer bar and the test bench.

[0060] As shown in the drawings, it is the third embodiment of the joint 22, which adopts a U-shaped structure, the thickness of the joint 22 is greater than that of the hollow composite stabilizer bar 19, and the connecting hole corresponding to the metal connecting piece 23 is opened at both sides of the joint 22. Before connection, the surface of the joint 22 is pretreated, and then 3MDP460 structural adhesive is applied at the connecting hole; finally, the metal connecting piece 23 is connected with the universal joint 18 through the pin, which ensures the reliability of the connection between the stabilizer bar and the test bench. Figure 10 11 The test bench is analyzed before testing: according to the load condition of the stabilizer bar, the stress analysis is carried out in the finite element abaqus, the position of the maximum stress of the bench during work is calculated, and the maximum stress is less than the yield stress of the clamp, which ensures the reliability of the bench device.

[0061] The test bench is analyzed before testing: according to the load condition of the stabilizer bar, the stress analysis is carried out in the finite element abaqus, the position of the maximum stress of the bench during work is calculated, and the maximum stress is less than the yield stress of the clamp, which ensures the reliability of the bench device.

[0062] ​​Further, the control cabinet and the test host are connected by signals and can control the movement of the test host. Meanwhile, the control cabinet transmits control signals to the sensor 3, thereby controlling the movement of the stabilizer. At the same time, the sensor 3 also feeds back signals to the control cabinet. Specifically, the control cabinet outputs signals to control the servo motor 8, the motor 8 drives the ball screw 4 to rotate, the ball screw 4 drives the middle cross beam 1 to move up and down, the linkage swing rod 11 moves up and down, and then the stabilizer 19 moves up and down through the connected clamps 13, 17 or joints 21, 21, 22. The frequency of the controller output signal is set to repeatedly load the stabilizer 19. The sensor 3 transmits the measured displacement and force signals to the control cabinet, and the control cabinet compares the test signals with the command signals to determine the results, so that a closed loop is formed between the test host and the controller, the control of the entire test device is realized, and the required output parameters are recorded by the computer in the control cabinet.

[0063] When the above device is used to test the stiffness of the stabilizer, the following steps are included:

[0064] 1-1), place the stabilizer 19 on the base plate 14 and position the stabilizer through the rubber bushing 15;

[0065] 1-2), after adjusting to the appropriate position, fix the stabilizer 19 on the test bench through the end clamps 13, 17 or joints 20, 21, 22;

[0066] 1-3), connect the test bench with the test host;

[0067] 1-4), start the test host, control the servo motor 8 through the controller according to the provisions of JB / T 12794.1-2016, apply the rated load to the test joint, then transmit the load to the stabilizer 19 through the test bench, and record the displacement and load during the loading process;

[0068] 1-5), calculate the stiffness value of the stabilizer by the formula K=F / S, where K is the linear stiffness value of the stabilizer, F is the load applied by the host, and S is the displacement of the end of the stabilizer;

[0069] When the above device is used to test the fatigue of the stabilizer, the following steps are included:

[0070] 2-1), place the stabilizer 19 on the base plate 14 and position the stabilizer through the rubber bushing 15;

[0071] 2-2), after adjusting to the appropriate position, fix the stabilizer on the test bench through the end clamps or joints;

[0072] 2-3), connect the test bench with the test host;

[0073] 2-4), start the test host, and set the frequency of the reciprocating motion of the host test connector through the controller according to JB / T 12794.1-2016, and record the number of final stable rod periodic motion;

[0074] 2-5), record the number of final stable rod periodic motion as T, which is the fatigue life of the stable rod.

[0075] The above specific embodiments are only the preferred embodiments of the present application, and are not used to limit the present application, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of composite stabilizer bar stiffness and fatigue testing for testing a stabilizer bar for stiffness and fatigue, the method comprising: The device comprises a test main machine, a test bench and a control cabinet; the test bench is connected with the test main machine through a universal joint; the control cabinet is connected with the test main machine through signals and can control the movement of the test main machine; ​ The test main machine comprises an upper crossbeam, a middle crossbeam, a base, a workbench and a servo motor; the upper crossbeam and the workbench are fastened together through a plurality of columns; the bottom of the column is fixed on the base; a vertically arranged ball screw is pivotally connected to the base; the middle crossbeam is matched with the ball screw and is driven to move up and down through the rotation of the ball screw; a test connector is arranged on the middle crossbeam; a sensor is mounted on the upper part of the test connector; the servo motor is mounted on the base and drives the ball screw to rotate through a transmission device; The test bench comprises a swing rod, a support frame, a clamp, a bottom plate and a rubber bushing; the swing rod is connected to the test connector of the middle crossbeam through a universal joint; the upper part of the support frame is fastened to the swing rod through a pin shaft, and the bottom part is welded and fixed on the bottom plate; the rubber bushing connects the stabilizer rod to the bottom plate through bolts, so as to axially position the stabilizer rod; the bottom plate is fixed on the workbench; the lower parts of the two ends of the swing rod are also respectively provided with universal joints, and the lower universal joints are connected with the stabilizer rod through the clamp or the connecting connector; When the stiffness of the stabilizer rod is tested, the following steps are included: 1-1), place the stabilizer rod on the bottom plate and position it through the rubber bushing; 1-2), after adjusting to a suitable position, fix the stabilizer rod on the test bench through the clamp or the connecting connector; 1-3), connect the test bench with the test main machine; 1-4), start the test main machine, control the servo motor through the controller, apply the rated load to the test connector, then transmit the load to the stabilizer rod through the test bench, and record the displacement and load during the loading process; 1-5), calculate the stiffness value of the stabilizer rod through the formula K=F / S, wherein K is the linear stiffness value of the stabilizer rod, F is the load applied by the main machine, and S is the displacement of the end of the stabilizer rod; When the fatigue test of the stabilizer rod is performed, the following steps are included: 2-1), place the stabilizer rod on the bottom plate and position it through the rubber bushing; 2-2), after adjusting to a suitable position, fix the stabilizer rod on the test bench through the clamp or the connecting connector; 2-3), connect the test bench with the test main machine; 2-4), start the test main machine, set the frequency of the reciprocating motion of the test connector of the main machine through the controller, and record the number of cycles of the final stabilizer rod; 2-5), record the number of cycles of the final stabilizer rod as T, which is the fatigue life of the stabilizer rod.

2. The method of composite material stability rod stiffness and fatigue testing of claim 1, wherein: The control cabinet outputs signals to control the servo motor, the motor drives the ball screw to rotate, the ball screw drives the middle crossbeam to move up and down, the swing rod moves up and down in linkage, and then the stabilizer rod moves up and down through the connected clamp or connecting connector, and the frequency of the controller output signal is set to repeatedly load the stabilizer rod.

3. The method of composite material stability rod stiffness and fatigue testing of claim 1, wherein: The clamp adopts a symmetrical semicircular structure, and the two sides are fastened through bolts and nuts to clamp the stabilizer rod.

4. The method of composite material stability rod stiffness and fatigue testing of claim 1, wherein: The universal joint is a double-joint universal joint; the swing rod adopts a hollow aluminum alloy swing rod, the cross section of which is a concave structure, and the universal joint can slide in the concave groove.

5. The method of composite material stability rod stiffness and fatigue testing of claim 1, wherein: The connecting joint is provided with a connecting hole of a certain length at the connecting position of the connecting joint and the stabilizer rod according to the diameter of the rod body, and a pin hole of a corresponding size is formed at the other end of the connecting joint; before connection, the surface of the connecting joint at the connecting position of the connecting joint and the stabilizer rod is subjected to plasma surface treatment, and then 3MDP460 structural adhesive is applied; after the connecting joint and the composite stabilizer rod are solidly connected, the other end of the connecting joint is fixed with the universal joint through pin connection.

6. The method of composite material stability rod stiffness and fatigue testing of claim 1, wherein: The connecting joint is provided with a connecting hole of a certain length at the connecting position of the connecting joint and the stabilizer rod according to the diameter of the rod body, and a pin hole of a corresponding size is formed at the other end of the connecting joint; before connection, the surface of the connecting joint at the connecting position of the connecting joint and the stabilizer rod is subjected to plasma surface treatment, and then 3MDP460 structural adhesive is applied; after the connecting joint and the composite stabilizer rod are solidly connected, the other end of the connecting joint is fixed with the universal joint through pin connection.

7. The method of composite material stability rod stiffness and fatigue testing of claim 1, wherein: The connecting joint adopts a U-shaped structure, the thickness of the connecting joint is greater than the thickness of the hollow composite stabilizer rod, and connecting holes corresponding to the metal connecting piece are formed on both sides of the connecting joint; before connection, the surface of the connecting joint is pretreated, and then 3MDP460 structural adhesive is applied at the connecting holes; finally, the metal connecting piece is used for pin connection with the universal joint.

8. The method of composite material stability bar rigidity and fatigue testing of claim 1, wherein: The test bench is subjected to load analysis before testing: according to the load condition of the stabilizer rod, stress analysis is carried out in the finite element abaqus, the position of the end clamp at the maximum stress position of the bench during work is calculated, and the maximum stress is less than the yield stress of the clamp.

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