Method for predicting multiaxial fatigue of automobile rear suspension

A rear suspension and automobile technology, which is applied in the direction of measuring devices, vehicle testing, mechanical parts testing, etc., can solve problems such as inability to count cycles, fatigue damage, etc., and achieve the effect of improving calculation accuracy

Inactive Publication Date: 2009-12-02
TONGJI UNIV
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Problems solved by technology

But in fact, the road condition of the car is bad, and the rear suspension of the car is subjected to multi-axis cyclic loads. The fatigue behavior of the rear suspension under non-proportional loading is far different from that of single-axis or multi-axis proportional fatigue loading, especially under non-proportional variable amplitude loading. , cannot perform simple cycle counting as in the case of uniaxial loading, so it will be very difficult to predict its fatigue damage simply by using the traditional uniaxial fatigue theory

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  • Method for predicting multiaxial fatigue of automobile rear suspension
  • Method for predicting multiaxial fatigue of automobile rear suspension
  • Method for predicting multiaxial fatigue of automobile rear suspension

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Embodiment Construction

[0023] Please refer to the attached drawings to further describe the present invention.

[0024] The following briefly explains the principle:

[0025] 1. Theory of elastoplastic deformation

[0026] 1) Yield criterion

[0027] The yield criterion is used to determine the magnitude of the stress at the beginning of plastic deformation. The common yield criteria are the Von Mises criterion and the Tresca criterion. For most metals, the Von Mises criterion is more consistent with the experimental data than the Tresca criterion.

[0028] The Von Mises criterion believes that for isotropic materials, when J 2 The material yields when reaching a certain value, that is

[0029] J 2 =K (1)

[0030] Among them, K is the material parameter to be determined. The test proves that K is equal to the uniaxial test yield stress σ s One-third of the square, i.e. K = 1 3 σ s 2 ...

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Abstract

The invention discloses a method for predicting multiaxial fatigue of an automobile rear suspension, which comprises the following steps: performing rear suspension elastic plasticity finite element analysis based on a uniaxial cyclic stress-strain relationship, performing biaxiality analysis on the rear suspension, determining a rear suspension bearing multiaxial nonproportional load condition and possible crack propagation form thereof, and selecting a Bannantine model and a Wang-Brown model based on a critical plane method to test the multiaxial fatigue life of the rear suspension. The method has the advantages of avoiding the problem that an actual load condition of the automobile rear suspension cannot be truly considered in the conventional uniaxial fatigue life test, considering nonlinear factors of a rear suspension structure, rubber connecting elements and wheel tyres, contacting condition of the tyres and the ground and the like, and improving calculation accuracy.

Description

Technical field [0001] The invention relates to a prediction method, in particular to a method for predicting multi-axle fatigue of an automobile rear suspension. Background technique [0002] At present, the fatigue analysis methods of automobile rear suspension are based on the traditional uniaxial fatigue theory to predict the life of the rear suspension. But in fact, the road conditions of the car are bad, and the rear suspension of the car is subjected to multi-axis cyclic loading. The fatigue behavior of the rear suspension under non-proportional loading is far different from the uniaxial or multi-axis proportional fatigue loading characteristics, especially under non-proportional variable amplitude loading. , The simple cycle counting cannot be performed like the uniaxial loading situation, so it will be very difficult to predict the fatigue damage by simply using the traditional uniaxial fatigue theory. Summary of the invention [0003] The technical problem of the prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01M17/007G01N3/00
Inventor 吴光强李运超盛云王平鞠丽娟
Owner TONGJI UNIV
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