Cable fatigue test methods, devices, computer equipment and media

Abstract

The embodiments of the present application provide a cable fatigue test method, apparatus, computer equipment, and medium. The method includes: constructing a bending moment stress amplitude relationship equation, obtaining multiple sets of experimental parameters for cables of different diameters, inputting the diameter and center point bending moment of the cable in each set of experimental parameters into the bending moment stress amplitude relationship equation to output the experimental stress amplitude corresponding to each set of experimental parameters, optimizing the preset angle stress amplitude relationship equation based on the diameter, length, bending angle, and experimental stress amplitude of the cable in each set of experimental parameters to obtain a target stress amplitude relationship equation, and using the target stress amplitude relationship equation to perform a cable fatigue test on any cable to be tested. Based on the method provided by the present application, the accuracy of fatigue testing on wires can be improved.

Description

Technical Field

[0001] The present application relates to the field of materials science, and in particular to a cable fatigue test method, apparatus, computer equipment, and medium. Background Art

[0002] Fatigue testing of wires and cables helps to detect the performance and durability of wires and cables in actual use. However, the cost of wire fatigue test bench tests is high and the efficiency is low. In addition, fatigue testing of wires and cables started late, and there is a serious lack of equipment and experimental data for wire fatigue testing.

[0003] Currently, in traditional wire fatigue experiments, it is impossible to accurately solve the stress amplitude under the coupling of bending moment and pressure, resulting in a large gap between the experimental results and the actual performance of the material, and unable to accurately reflect the actual performance of the wire. Summary of the Invention

[0004] The embodiments of the present application provide a cable fatigue test method, apparatus, computer equipment, and medium, which can improve the accuracy of fatigue testing on wires.

[0005] In a first aspect, an embodiment of the present application provides a cable fatigue test method, comprising:

[0006] Constructing a bending moment stress amplitude relationship formula, wherein the bending moment stress amplitude relationship formula is used to characterize the correspondence between the stress amplitude of the cable and the diameter and center point bending moment of the cable; comprising: determining a difference relationship formula between a preset maximum tensile stress relationship formula and a preset maximum compressive stress relationship formula, wherein the maximum compressive stress relationship formula is used to characterize the correspondence between the maximum compressive stress of the cable and the center point bending moment, the diameter of the cable, and the pressure experienced; and the maximum tensile stress relationship formula is used to characterize the correspondence between the maximum tensile stress of the cable and the center point bending moment, the diameter of the cable, and the pressure experienced; determining the bending moment stress amplitude relationship formula as the ratio between the difference relationship formula and a first preset value, wherein the first preset value is a constant of 2;

[0007] Obtain multiple sets of experimental parameters for cables of different diameters, where each set of experimental parameters includes the cable's diameter, length, pressure on the cable, and the center-point bending moment and bending angle of the cable caused by the pressure;

[0008] Inputting the cable diameter and center point bending moment in each set of experimental parameters into the bending moment stress amplitude relationship formula to output the experimental stress amplitude corresponding to each set of experimental parameters;

[0009] Based on the diameter, length, bending angle and experimental stress amplitude of the cable in each set of experimental parameters, a preset angle-stress amplitude relationship formula is optimized to obtain a target stress amplitude relationship formula; the method comprises: transforming the preset angle-stress amplitude relationship formula according to preset conditions to obtain a corresponding parameter formula, wherein the parameter formula represents the ratio between the product of the diameter, bending angle and elastic modulus parameter of the cable and the product of the stress amplitude and the length of the cable, wherein the elastic modulus parameter is a preset value; inputting the diameter, length, bending angle and experimental stress amplitude of the cable in each set of experimental parameters into the parameter formula respectively to output a ratio result corresponding to each set of experimental parameters; determining the average value between the ratio results corresponding to each set of experimental parameters to obtain a target constant; replacing a default constant in the preset angle-stress amplitude relationship formula with the target constant to obtain the target stress amplitude relationship formula;

[0010] A cable fatigue test is performed on any cable to be tested using the target stress amplitude relationship.

[0011] In a possible implementation, the maximum compressive stress relationship is:

[0012]

[0013] in, is the maximum compressive stress of the cable, M is the bending moment at the center of the cable, r is the radius of the cable, and F is the pressure on the cable.

[0014] In a possible implementation, the maximum tensile stress relationship is:

[0015]

[0016] in, is the maximum tensile stress of the cable, M is the bending moment at the center of the cable, r is the radius of the cable, and F is the pressure on the cable.

[0017] In a possible implementation, the center point bending moment is determined by a preset center point bending moment relationship formula, wherein the center point bending moment relationship formula represents the correspondence between the center point bending moment of the cable and the pressure and bending height, bending angle and clamping length of the cable.

[0018] In a possible implementation, the center point bending moment relationship is:

[0019]

[0020] Where M is the bending moment at the center of the cable, F is the pressure on the cable, and L is the clamping length. is the bending angle, is the bending height at the center point.

[0021] In a second aspect, the present application provides a cable fatigue test device, comprising:

[0022] a processing module for constructing a bending moment stress amplitude relationship equation, wherein the bending moment stress amplitude relationship equation is used to characterize the correspondence between the stress amplitude of the cable and the diameter and center point bending moment of the cable; the processing module includes: determining a difference relationship equation between a preset maximum tensile stress relationship equation and a preset maximum compressive stress relationship equation, wherein the maximum compressive stress relationship equation is used to characterize the correspondence between the maximum compressive stress of the cable and the center point bending moment, the diameter of the cable, and the pressure experienced; and the maximum tensile stress relationship equation is used to characterize the correspondence between the maximum tensile stress of the cable and the center point bending moment, the diameter of the cable, and the pressure experienced; and determining the bending moment stress amplitude relationship equation as a ratio between the difference relationship equation and a first preset value, wherein the first preset value is a constant of 2;

[0023] An acquisition module is used to obtain multiple sets of experimental parameters of cables with different diameters, where each set of experimental parameters includes the diameter and length of the cable, the pressure exerted on the cable, and the center point bending moment and bending angle of the cable caused by the pressure;

[0024] The processing module is further configured to input the cable diameter and center point bending moment in each set of experimental parameters into the bending moment stress amplitude relationship equation to output the experimental stress amplitude corresponding to each set of experimental parameters;

[0025] The processing module is further configured to optimize a preset angle-stress amplitude relationship expression based on the diameter, length, bending angle, and experimental stress amplitude of the cable in each set of experimental parameters to obtain a target stress amplitude relationship expression; the processing module comprises: transforming the preset angle-stress amplitude relationship expression according to preset conditions to obtain a corresponding parameter expression, wherein the parameter expression represents the ratio between the product of the diameter, bending angle, and elastic modulus parameter of the cable and the product of the stress amplitude and the length of the cable, wherein the elastic modulus parameter is a preset value; inputting the diameter, length, bending angle, and experimental stress amplitude of the cable in each set of experimental parameters into the parameter expression respectively to output a ratio result corresponding to each set of experimental parameters; determining an average value between the ratio results corresponding to each set of experimental parameters to obtain a target constant; and replacing a default constant in the preset angle-stress amplitude relationship expression with the target constant to obtain the target stress amplitude relationship expression;

[0026] The processing module is further configured to perform a cable fatigue test on any cable to be tested using the target stress amplitude relationship.

[0027] In a third aspect, the present application provides a computer device, comprising: a memory, a processor;

[0028] The memory stores computer-executable instructions;

[0029] The processor executes the computer-executable instructions stored in the memory, so that the processor performs the above-mentioned method.

[0030] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to implement the method as described above when executed by a processor.

[0031] In a fifth aspect, the present application provides a computer program product, comprising a computer program, which implements the method described above when executed by a processor.

[0032] The cable fatigue test method, apparatus, computer equipment, and medium provided in the embodiments of the present application optimize the stress amplitude relationship by obtaining multiple sets of experimental parameters for a large number of cables with different diameters. This allows the optimized target stress amplitude relationship to more accurately obtain the results of the cable fatigue test, more accurately reflect the actual performance of the cable, and thus improve the accuracy of the cable fatigue test. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0034] Figure 1 Schematic diagram of the scenario provided for this application;

[0035] Figure 2 Schematic diagram of the cable fatigue test method provided for this application Figure 1 ;

[0036] Figure 3 Schematic diagram of the force on the cable as an example Figure 1 ;

[0037] Figure 4 Schematic diagram of cable bending deformation degree;

[0038] Figure 5 Schematic diagram of stress distribution of an example cable bending deformation;

[0039] Figure 6 The experimental parameters for example 1;

[0040] Figure 7 This is the experimental parameter 2 for the example;

[0041] Figure 8 Schematic diagram of the force on the cable as an example Figure 2 ;

[0042] Figure 9The experimental parameters for example three;

[0043] Figure 10 Schematic diagram of the structure of the cable fatigue test device provided in this application;

[0044] Figure 11 This is a schematic diagram of the structure of the electronic device provided in this application.

[0045] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0046] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0047] First, let’s explain the terms involved in this application:

[0048] Stress amplitude: refers to the quantitative indicator of the stress variation range of a material or structure when it is subjected to cyclic loads.

[0049] Bending moment: refers to the internal moment that causes an object to bend due to external force. It is a key parameter for measuring an object's ability to resist bending deformation.

[0050] Figure 1 The scenario diagram provided for this application shows that modeling software can be used to model the cable that needs to be fatigue tested. A clamp is placed at both ends of the cable to perform a fatigue test on the cable. The clamp and motor are rigid and do not deform by default. The clamps at both ends of the cable can be clamped by the motor to apply pressure in the opposite direction to the cable to cause the cable to deform under stress. This allows the stress amplitude of each mass point on the cable to be analyzed under the coupled action of pressure and bending moment. The cable length L outside the clamp is determined as the experimental length for fatigue analysis. L and the cable diameter d can be determined according to actual conditions.

[0051] Currently, in traditional wire fatigue experiments, it is impossible to accurately solve the stress amplitude under the coupling of bending moment and pressure, resulting in a large gap between the experimental results and the actual performance of the material, and unable to accurately reflect the actual performance of the wire.

[0052] This application optimizes the stress amplitude relationship by obtaining multiple sets of experimental parameters for a large number of cables with different diameters, so that the optimized target stress amplitude relationship can more accurately obtain the results of cable fatigue tests, and can more accurately reflect the actual performance of the cable, thereby improving the accuracy of cable fatigue tests.

[0053] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0054] Figure 2 Schematic diagram of the cable fatigue test method provided for this application Figure 1 ,like Figure 2 As shown, including:

[0055] S201. Construct a bending moment stress amplitude relationship formula, wherein the bending moment stress amplitude relationship formula is used to characterize the correspondence between the stress amplitude of the cable and the diameter and center point bending moment of the cable; including: determining a difference relationship formula between a preset maximum tensile stress relationship formula and a preset maximum compressive stress relationship formula, wherein the maximum compressive stress relationship formula is used to characterize the correspondence between the maximum compressive stress of the cable and the center point bending moment, the diameter of the cable and the pressure it is subjected to, and the maximum tensile stress relationship formula is used to characterize the correspondence between the maximum tensile stress of the cable and the center point bending moment, the diameter of the cable and the pressure it is subjected to; and determining the ratio between the difference relationship formula and a first preset value as the bending moment stress amplitude relationship formula, wherein the first preset value is a constant of 2.

[0056] In combination with the scenario example, the execution subject of the embodiment of the present application can be a computer device, such as a server with computing capabilities. The cable bends and deforms under pressure. Figure 3 Schematic diagram of the force on the cable as an example Figure 1 ,like Figure 3 As shown in the figure, A, B, Q and P are the end points of the clamps at both ends of the cable, C and D are the center points of the clamps, F is the pressure applied to the cable, E is the midpoint of the cable, and M is the bending moment at E. is the bending angle of the cable, is the angle between the tangent line at point C and the horizontal line, is the distance between the center point E and the horizontal line AB, which can represent the bending height of the center point E. The bending moment stress amplitude relationship can be shown as follows:

[0057]

[0058] in, is the stress amplitude of the cable, M is the bending moment at the center of the cable, that is, the bending moment at point E, d is the diameter of the cable, and I is a constant related to the diameter, which is:

[0059]

[0060] Specifically, combined with scenario examples, Figure 4 A schematic diagram of cable bending deformation is shown as follows: Figure 4 As shown, after the cable is bent and deformed, the position where the cable is bent to the maximum is the midpoint E of the cable, and the bending degree decays to both sides. The closer to the clamp, the smaller the bending degree. Figure 5 The following diagram illustrates the stress distribution of a cable during bending deformation. When a cable is bent, tensile stress is applied to its upper surface and compressive stress to its lower surface. The maximum tensile and compressive stresses occur at the cable's midpoint E and decrease toward the sides, decreasing toward the fixture. Therefore, the maximum tensile stress is the tensile stress on the upper surface corresponding to the cable's center point E, and the maximum compressive stress is the compressive stress on the lower surface corresponding to the center point E.

[0061] The difference between the maximum tensile stress relationship and the maximum compressive stress relationship is:

[0062]

[0063] The first preset value is 2, so after comparing the difference between the maximum tensile stress relationship and the maximum compressive stress relationship with 2, the following bending moment stress amplitude is obtained:

[0064]

[0065] S202 , obtaining multiple sets of experimental parameters for cables with different diameters, wherein each set of experimental parameters includes the diameter and length of the cable, the pressure exerted on the cable, and the center point bending moment and bending angle of the cable caused by the pressure.

[0066] Combined with the scene example, Figure 6 For example, the experimental parameters are Figure 6 The figure shows the center-point bending moment and bending angle of two cables with different diameters under different pressures. The cable diameters are 3.98mm and 3.57mm, respectively. The corresponding pressures are applied to the two cables to obtain the center-point bending moment and bending angle values ​​under different pressures.

[0067] S203 , inputting the cable diameter and center point bending moment in each set of experimental parameters into the bending moment stress amplitude relationship formula to output the experimental stress amplitude corresponding to each set of experimental parameters.

[0068] Combined with the scenario example and the above bending moment stress amplitude relationship, the values ​​corresponding to the cable diameter d and the center point bending moment M can be input into the bending moment stress amplitude relationship to obtain the stress amplitude The value of the stress amplitude can be obtained from the bending moment stress amplitude relationship. The value of is taken as the experimental stress amplitude.

[0069] S204. Based on the diameter, length, bending angle and experimental stress amplitude of the cable in each set of experimental parameters, the preset angle-stress amplitude relationship formula is optimized to obtain a target stress amplitude relationship formula; including: transforming the preset angle-stress amplitude relationship formula according to preset conditions to obtain a corresponding parameter formula, wherein the parameter formula represents the ratio between the product of the diameter, bending angle and elastic modulus parameter of the cable and the product of the stress amplitude and the length of the cable, wherein the elastic modulus parameter is a preset value; inputting the diameter, length, bending angle and experimental stress amplitude of the cable in each set of experimental parameters into the parameter formula respectively to output the ratio result corresponding to each set of experimental parameters; determining the average value between the ratio results corresponding to each set of experimental parameters to obtain a target constant; replacing the default constant in the preset angle-stress amplitude relationship formula with the target constant to obtain the target stress amplitude relationship formula.

[0070] Combined with the scenario example, you can refer to the relevant manual to determine the initial angle stress amplitude relationship as follows:

[0071]

[0072] Where d is the diameter of the cable, is the bending angle of the cable, is the angle between the tangent line at point C and the horizontal line, E is the elastic modulus, which is a preset fixed value, and L is the length of the cable. In this example, L can be determined to be 400 mm.

[0073] However, according to the initial angle stress amplitude relationship in the manual, the stress amplitude data obtained is too small. Then, we considered using pure bending moment to solve the cantilever beam large deflection equation to optimize the angle stress amplitude relationship. The constant was optimized from 357.7 to 57.3, and the following angle stress amplitude relationship was obtained:

[0074]

[0075] The large deflection equation of the cantilever beam is as follows:

[0076]

[0077] Where d is the cable diameter, refer to Figure 3 , is the distance between the center point E and the horizontal line AB, which can represent the bending height of the center point E. It represents the bending moment corresponding to a certain point on the cable. E is the elastic modulus, which is a preset fixed value. I is a constant related to the diameter d of the cable, which is:

[0078]

[0079] However, the stress amplitude data obtained from the angle stress amplitude relationship after the optimization of the cantilever beam large deflection equation is still too small. Therefore, the angle stress amplitude relationship after the optimization of the cantilever beam large deflection equation can be used as the preset angle stress amplitude relationship. The numerical simulation method is used to refer to Figure 6 The cable diameter, length, bending angle and experimental stress amplitude in each set of experimental parameters are further optimized, and the constant is optimized from 57.3 to 41.4 to obtain the target stress amplitude relationship. The target stress amplitude relationship is as follows:

[0080]

[0081] S205: Perform a cable fatigue test on any cable to be tested using the target stress amplitude relationship.

[0082] In this scenario example, since the target stress amplitude equation represents the relationship between the bending angle and stress amplitude after a cable is bent and deformed, the bending angle of any cable under test can be directly captured during a cable fatigue test. After determining the length and diameter of the cable under test, the captured bending angle, length, diameter, and preset elastic modulus are input into the target stress amplitude equation to obtain the corresponding stress amplitude.

[0083] This example optimizes the stress amplitude relationship by obtaining multiple sets of experimental parameters for a large number of cables with different diameters. This allows the optimized target stress amplitude relationship to more accurately obtain the results of cable fatigue tests, more accurately reflecting the actual performance of the cables, and thus improving the accuracy of cable fatigue tests.

[0084] Optionally, the maximum compressive stress relationship is:

[0085]

[0086] in, is the maximum compressive stress of the cable, M is the bending moment at the center of the cable, r is the radius of the cable, and F is the pressure on the cable.

[0087] Combined with the scenario example, the relationship between the initial maximum compressive stress and the initial maximum compressive stress is as follows:

[0088]

[0089] Among them, M is the bending moment at the center of the cable, that is, the bending moment at point E, r is the radius of the cable, and F is the pressure on the cable.

[0090] I and A are constants related to the diameter d of the cable, where I and A are:

[0091]

[0092]

[0093] Therefore, the maximum compressive stress relationship is obtained as follows:

[0094]

[0095] Optionally, the maximum tensile stress relationship is:

[0096]

[0097] in, is the maximum tensile stress of the cable, M is the bending moment at the center of the cable, r is the radius of the cable, and F is the pressure on the cable.

[0098] Combined with the scenario example, the relationship between the initial maximum tensile stress and the initial maximum tensile stress is as follows:

[0099]

[0100] In the maximum tensile stress relationship and the maximum compressive stress relationship, M is the bending moment at the center of the cable, that is, the bending moment at point E, r is the radius of the cable, and F is the pressure on the cable.

[0101] I and A are constants related to the diameter d of the cable, where I and A are:

[0102]

[0103]

[0104] Therefore, the maximum tensile stress relationship is:

[0105]

[0106] Combined with the above, Figure 7 For example, the experimental parameter 2 is Figure 7 As shown, in Figure 6 Based on the experimental parameters of the example, the bending moment at the center point of the cable, the diameter, radius and pressure of the cable can be input into the above-mentioned maximum tensile stress relationship and maximum compressive stress relationship respectively to obtain the maximum tensile stress and maximum compressive stress corresponding to point E.

[0107] Optional, such as Figure 7 As shown, the stress amplitude It can also be determined based on the maximum tensile stress and maximum compressive stress obtained. Specifically, the value corresponding to half of the maximum tensile stress minus the maximum compressive stress can be determined as the stress amplitude. .

[0108] Based on the method provided in this example, the relationship between the maximum tensile stress and the maximum compressive stress can be obtained, and the stress amplitude of the cable can be determined by the determined maximum tensile stress and maximum compressive stress.

[0109] Optionally, the center point bending moment is determined by a preset center point bending moment relationship formula, wherein the center point bending moment relationship formula represents the correspondence between the center point bending moment of the cable and the pressure and bending height, bending angle and clamping length of the cable.

[0110] Combined with the scenario example, the bending moment expression at any point on the cable is:

[0111]

[0112] Where x refers to a point on the cable, F is the pressure on the cable, and L is the length of the cable. is the bending angle of the cable, is the angle between the tangent line at point C and the horizontal line, is the bending height corresponding to a certain point on the cable.

[0113] Based on the above expression of the bending moment at any point on the cable, the center point bending moment relationship can be obtained. Today, the center point bending moment of the cable, that is, the bending moment of point E, is obtained through the center point bending moment relationship.

[0114] Based on the method provided in this example, the cable center point bending moment can be obtained through the center point bending moment relationship.

[0115] Optionally, the center point bending moment relationship is:

[0116]

[0117] Where M is the bending moment at the center of the cable, F is the pressure on the cable, and L is the clamping length. is the bending angle, is the bending height at the center point.

[0118] Combined with the scene example, Figure 8 Schematic diagram of the force on the cable as an example Figure 2 ,like Figure 8 As shown, The value of point E is e, and the corresponding for , so the center point bending moment relationship can be:

[0119]

[0120] Based on the above content, the constant in the angle stress amplitude relationship is optimized from 57.3 to 41.4 to obtain the target stress amplitude relationship, which is:

[0121] The relationship between the angular stress amplitude is:

[0122]

[0123] Combined with the scenario example, the default constant in the preset angle stress amplitude relationship is 57.3. The preset condition can be to move the default constant to the left of the equal sign. Move to the right side of the equal sign, and after transformation according to the above preset conditions, determine the right side of the equal sign as a parametric expression, so the obtained parametric expression is:

[0124]

[0125] Where d is the diameter of the cable, is the bending angle of the cable, is the angle between the tangent line at point C and the horizontal line, E is the elastic modulus, is the experimental stress amplitude obtained, and L is the length of the cable.

[0126] Figure 9 For example, the experimental parameters are three, such as Figure 9 As shown, the cable diameter, length, bending angle, and experimental stress amplitude in the experimental parameters are input into the obtained parameter formula to obtain the corresponding ratio results. The ratio results corresponding to each set of experimental parameters are basically constant, so the average value can be calculated, and the target constant is approximately 41.4. 41.4 is replaced with 57.3 in the preset angle stress amplitude relationship to obtain the target stress amplitude relationship formula:

[0127]

[0128] Based on the method provided in this example, a more accurate target stress amplitude relationship can be obtained by optimizing the preset angle stress amplitude relationship by obtaining multiple sets of experimental parameters for a large number of cables with different diameters.

[0129] The method embodiment provided in the present application can use the optimized target stress amplitude relationship to perform fatigue tests on cables, which can more accurately obtain the results of cable fatigue tests and more accurately reflect the actual performance of the cables, thereby improving the accuracy of cable fatigue tests.

[0130] Figure 10 The structural diagram of the cable fatigue test device provided in this application is as follows: Figure 10 As shown, including:

[0131] Processing module 101 is configured to construct a bending moment stress amplitude relationship equation, wherein the bending moment stress amplitude relationship equation is used to characterize the correspondence between the stress amplitude of the cable and the cable diameter and center point bending moment; the process includes: determining a difference relationship equation between a preset maximum tensile stress relationship equation and a preset maximum compressive stress relationship equation, wherein the maximum compressive stress relationship equation is used to characterize the correspondence between the maximum compressive stress of the cable and the center point bending moment, the cable diameter, and the pressure experienced; and the maximum tensile stress relationship equation is used to characterize the correspondence between the maximum tensile stress of the cable and the center point bending moment, the cable diameter, and the pressure experienced; and determining the bending moment stress amplitude relationship equation as a ratio between the difference relationship equation and a first preset value, wherein the first preset value is a constant of 2.

[0132] An acquisition module 102 is configured to acquire multiple sets of experimental parameters for cables of different diameters, wherein each set of experimental parameters includes the diameter and length of the cable, the pressure exerted on the cable, and the center point bending moment and bending angle of the cable caused by the pressure;

[0133] The processing module 101 is further configured to input the cable diameter and center point bending moment in each set of experimental parameters into the bending moment stress amplitude relationship equation to output the experimental stress amplitude corresponding to each set of experimental parameters;

[0134] The processing module 101 is further configured to optimize a preset angle-stress amplitude relationship equation based on the diameter, length, bending angle, and experimental stress amplitude of the cable in each set of experimental parameters to obtain a target stress amplitude relationship equation; the processing module 101 comprises: transforming the preset angle-stress amplitude relationship equation according to preset conditions to obtain a corresponding parameter equation, wherein the parameter equation represents the ratio between the product of the diameter, bending angle, and elastic modulus parameter of the cable and the product of the stress amplitude and the length of the cable, wherein the elastic modulus parameter is a preset value; inputting the diameter, length, bending angle, and experimental stress amplitude of the cable in each set of experimental parameters into the parameter equation respectively to output a ratio result corresponding to each set of experimental parameters; determining an average value between the ratio results corresponding to each set of experimental parameters to obtain a target constant; and replacing a default constant in the preset angle-stress amplitude relationship equation with the target constant to obtain the target stress amplitude relationship equation;

[0135] The processing module 101 is further configured to perform a cable fatigue test on any cable to be tested using the target stress amplitude relationship.

[0136] The cable fatigue test device provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effects are similar, and are not described in detail in this embodiment.

[0137] Figure 11This is a schematic diagram of the structure of the electronic device provided in this application. Figure 11 As shown, the electronic device 50 provided in this embodiment includes: at least one processor 501 and a memory 502. Optionally, the electronic device 50 further includes a communication component 503. The processor 501, the memory 502 and the communication component 503 are connected via a bus.

[0138] In a specific implementation process, at least one processor 501 executes the computer-executable instructions stored in the memory 502, so that the at least one processor 501 performs the above method.

[0139] The specific implementation process of the processor 501 can be found in the above method embodiment. Its implementation principle and technical effects are similar and will not be repeated here in this embodiment.

[0140] In the above embodiments, it should be understood that the processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASICs), etc. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the present invention may be directly executed by a hardware processor or by a combination of hardware and software modules within the processor.

[0141] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage.

[0142] A bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Buses can be categorized as address buses, data buses, and control buses. For ease of illustration, the buses in the drawings of this application are not limited to just one bus or just one type of bus.

[0143] The present application also provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0144] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0145] The readable storage medium may be implemented by any type of volatile or non-volatile memory device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0146] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0147] The division of units is merely a logical functional division; actual implementations may employ alternative divisions, such as combining or integrating multiple units or components into another system, or omitting or disabling certain features. Furthermore, any direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units, either through an interface, electrical, mechanical, or other means.

[0148] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0149] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0150] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of the present invention. The aforementioned storage medium includes various media that can store program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0151] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0152] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

Claims

1. A cable fatigue test method, characterized in that: include: Constructing a bending moment stress amplitude relationship formula, wherein the bending moment stress amplitude relationship formula is used to characterize the correspondence between the stress amplitude of the cable and the diameter and center point bending moment of the cable; comprising: determining a difference relationship formula between a preset maximum tensile stress relationship formula and a preset maximum compressive stress relationship formula, wherein the maximum compressive stress relationship formula is used to characterize the correspondence between the maximum compressive stress of the cable and the center point bending moment, the diameter of the cable, and the pressure experienced; and the maximum tensile stress relationship formula is used to characterize the correspondence between the maximum tensile stress of the cable and the center point bending moment, the diameter of the cable, and the pressure experienced; determining the bending moment stress amplitude relationship formula as the ratio between the difference relationship formula and a first preset value, wherein the first preset value is a constant of 2; Obtain multiple sets of experimental parameters for cables of different diameters, where each set of experimental parameters includes the cable's diameter, length, pressure on the cable, and the center-point bending moment and bending angle of the cable caused by the pressure; Inputting the cable diameter and center point bending moment in each set of experimental parameters into the bending moment stress amplitude relationship formula to output the experimental stress amplitude corresponding to each set of experimental parameters; Based on the diameter, length, bending angle and experimental stress amplitude of the cable in each set of experimental parameters, a preset angle-stress amplitude relationship formula is optimized to obtain a target stress amplitude relationship formula; the method comprises: transforming the preset angle-stress amplitude relationship formula according to preset conditions to obtain a corresponding parameter formula, wherein the parameter formula represents the ratio between the product of the diameter, bending angle and elastic modulus parameter of the cable and the product of the stress amplitude and the length of the cable, wherein the elastic modulus parameter is a preset value; inputting the diameter, length, bending angle and experimental stress amplitude of the cable in each set of experimental parameters into the parameter formula respectively to output a ratio result corresponding to each set of experimental parameters; determining the average value between the ratio results corresponding to each set of experimental parameters to obtain a target constant; replacing a default constant in the preset angle-stress amplitude relationship formula with the target constant to obtain the target stress amplitude relationship formula; A cable fatigue test is performed on any cable to be tested using the target stress amplitude relationship.

2. The method according to claim 1, characterized in that The maximum compressive stress relationship is: in, is the maximum compressive stress of the cable, M is the bending moment at the center of the cable, r is the radius of the cable, and F is the pressure on the cable.

3. The method according to claim 1, characterized in that The maximum tensile stress relationship is: in, is the maximum tensile stress of the cable, M is the bending moment at the center of the cable, r is the radius of the cable, and F is the pressure on the cable.

4. The method according to claim 2 or 3, characterized in that The center point bending moment is determined by a preset center point bending moment relationship formula, wherein the center point bending moment relationship formula represents the corresponding relationship between the center point bending moment of the cable and the pressure and bending height, bending angle and clamping length of the cable.

5. The method according to claim 4, characterized in that The center point bending moment relationship is: Where M is the bending moment at the center of the cable, F is the pressure on the cable, and L is the clamping length. is the bending angle, is the bending height at the center point.

6. A cable fatigue test device, characterized in that: include: a processing module for constructing a bending moment stress amplitude relationship equation, wherein the bending moment stress amplitude relationship equation is used to characterize the correspondence between the stress amplitude of the cable and the diameter and center point bending moment of the cable; the processing module includes: determining a difference relationship equation between a preset maximum tensile stress relationship equation and a preset maximum compressive stress relationship equation, wherein the maximum compressive stress relationship equation is used to characterize the correspondence between the maximum compressive stress of the cable and the center point bending moment, the diameter of the cable, and the pressure experienced; and the maximum tensile stress relationship equation is used to characterize the correspondence between the maximum tensile stress of the cable and the center point bending moment, the diameter of the cable, and the pressure experienced; and determining the bending moment stress amplitude relationship equation as a ratio between the difference relationship equation and a first preset value, wherein the first preset value is a constant of 2; An acquisition module is used to obtain multiple sets of experimental parameters of cables with different diameters, where each set of experimental parameters includes the diameter and length of the cable, the pressure exerted on the cable, and the center point bending moment and bending angle of the cable caused by the pressure; The processing module is further configured to input the diameter and center point bending moment of the cable in each set of experimental parameters into the bending moment stress amplitude relationship equation to output the experimental stress amplitude corresponding to each set of experimental parameters; The processing module is further configured to optimize a preset angle-stress amplitude relationship expression based on the diameter, length, bending angle, and experimental stress amplitude of the cable in each set of experimental parameters to obtain a target stress amplitude relationship expression; the processing module comprises: transforming the preset angle-stress amplitude relationship expression according to preset conditions to obtain a corresponding parameter expression, wherein the parameter expression represents the ratio between the product of the diameter, bending angle, and elastic modulus parameter of the cable and the product of the stress amplitude and the length of the cable, wherein the elastic modulus parameter is a preset value; inputting the diameter, length, bending angle, and experimental stress amplitude of the cable in each set of experimental parameters into the parameter expression respectively to output a ratio result corresponding to each set of experimental parameters; determining an average value between the ratio results corresponding to each set of experimental parameters to obtain a target constant; and replacing a default constant in the preset angle-stress amplitude relationship expression with the target constant to obtain the target stress amplitude relationship expression; The processing module is further configured to perform a cable fatigue test on any cable to be tested using the target stress amplitude relationship.

7. A computer device, characterized in that: include: Memory, processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor performs the method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 5 when executed by a processor.

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