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A method for analyzing fatigue life of steering knuckle

A technology of fatigue life analysis and fatigue life, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of ignoring plastic strain, increasing development cycle and cost, lack of fatigue life analysis methods, etc., to achieve fatigue analysis The result is precise effect

Active Publication Date: 2019-01-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the fatigue performance verification of parts, there are usually laboratory bench tests, proving ground road tests and actual road fatigue durability tests. Development cycle and cost, if the fatigue simulation analysis can be carried out in the design stage, and the structure can be improved in time, the test cost can be reduced to a certain extent and the product development cycle can be shortened
[0004] However, at present, when conducting part-level tests on steering knuckles, there are few simulation verifications in the design stage. When performing fatigue simulations that simulate the actual road load spectrum, most current methods only consider the elastic phase of the material and ignore In order to avoid the plastic strain generated under some relatively extreme working conditions, the prior art also lacks a more effective fatigue life analysis method when there is no actual road load spectrum of the steering knuckle

Method used

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  • A method for analyzing fatigue life of steering knuckle
  • A method for analyzing fatigue life of steering knuckle
  • A method for analyzing fatigue life of steering knuckle

Examples

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Embodiment 1

[0044] like figure 1 As shown, in the embodiment of the present invention, a steering knuckle fatigue life analysis method includes the following steps:

[0045] Obtain the fatigue load of the steering knuckle. If it is a combined static load condition, it is necessary to obtain the load of each static load condition. The method is to calculate the contact point of the wheel or the center of the wheel by defining the dynamic load coefficient of the vehicle driving condition. Force, and then obtain the load of each installation point of the steering knuckle by inputting the force of the wheel contact point or the wheel center in the multibody dynamics model.

[0046] As an example, Table 1 shows the loads of the steering knuckle and the control arm installation point under six working conditions. Because the installation point is connected by a spherical joint, there are only three translational force components and no torque.

[0047] Table 1

[0048]

[0049] like figu...

Embodiment 2

[0066] In this embodiment of the present invention, as figure 1 As shown, a steering knuckle fatigue life analysis method includes the following analysis process:

[0067] Obtain the fatigue load of the steering knuckle, if it is the actual road load spectrum, because the actual road load spectrum directly measures the six-component force at the four wheel centers of the car, so the wheel center force needs to be decomposed to obtain the load spectrum of each installation point of the steering knuckle, The method is to establish the vehicle dynamics model in the multi-body dynamics software, take the wheel center force load spectrum as the iterative target, obtain the excitation signal of the virtual vertical wheel cylinder, and use the excitation signal as the input of the dynamics simulation, and then Obtain the load spectrum of each installation point of the steering knuckle, such as the load spectrum obtained in the x direction of the load of the steering knuckle and the c...

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Abstract

The invention discloses a method for analyzing the fatigue life of a steering knuckle, comprising the following steps: 1) obtaining the fatigue load of the steering knuckle; 2) carrying out uniaxial tensile material test on the use material; 3) if the fatigue load is under the static load condition, the elastic-plastic finite element analysis method is adopted to solve the problem; or, if it is the actual pavement load spectrum, the elastic-plastic finite element analysis is carried out on the points exceeding the yield strength by elastic finite element method and linear superposition method,and the modified stress-strain results are obtained. 4) analyzing the biaxiality of the obtained stress response in time domain to determine the load state of the steering knuckle; 5) calculating thedamage accumulation and life of steering knuckle. The present invention solves the problem of time-consuming finite element solution under the input of actual pavement load spectrum, at the same time, the stress and strain of the material entering the plastic phase are considered, so that the result is more accurate, and fatigue analysis is carried out by combining the static load condition or the single channel static load condition, and more references are provided in the design phase.

Description

technical field [0001] The invention relates to a method for analyzing the fatigue life of automobile parts, in particular to a method for analyzing the fatigue life of an automobile steering knuckle. Background technique [0002] Automobile steering knuckle is an important safety component in automobile suspension. Its function is mainly to connect the wheel and the body and carry the sprung mass. At the same time, the steering knuckle of the steering bridge is also responsible for driving the wheels to turn. The vertical force, lateral force, longitudinal force and braking torque of the wheel are directly transmitted to the steering knuckle. If the steering knuckle breaks and breaks during use, serious accidents are likely to occur, so there are greater requirements for the structural performance of the steering knuckle. During the actual use of the car, the loads on the parts of the car are all alternating loads, and their amplitudes vary randomly. Under the action of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/04G06F30/15Y02T90/00
Inventor 上官文斌曾文豪
Owner SOUTH CHINA UNIV OF TECH
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