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Evaluation method of residual strength and service life under strengthening and damaging combined action

A technology of joint action and evaluation method, applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve problems such as cars that have not been seen on the market, and achieve the effect of saving resources

Inactive Publication Date: 2010-06-02
UNIV OF SHANGHAI FOR SCI & TECH
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AI Technical Summary

Problems solved by technology

[0004] At present, the whole world is discussing effective methods and ways to reduce the weight of automobiles, but so far, no lightweight and low-cost automobiles have been launched on the market.

Method used

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  • Evaluation method of residual strength and service life under strengthening and damaging combined action
  • Evaluation method of residual strength and service life under strengthening and damaging combined action
  • Evaluation method of residual strength and service life under strengthening and damaging combined action

Examples

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0015] Taking the tractor half shaft (medium-strength parts. The material is 40Cr, the yield limit is 905.5MPa, and the tensile strength is 1000.3MPa) in the random load spectrum life test as an example. All tests are carried out on the electro-hydraulic servo torsional fatigue testing machine. The sample clamping method is fixed by the spline at the left end, and the pure torsional load is applied to the spline at the right end. The slight movement of the specimen in the axial direction is not restricted during the loading process, so as to ensure that the axial deformation of the specimen is not restricted when it is torsion. The evaluation method of residual strength and life under the joint action of tractor half shaft strengthening and damage is as follows:

[0016] (A) Obtain the original stress-life curve of the material or part by test...

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Abstract

The invention relates to an evaluation method of residual strength and service life under strengthening and damaging combined action, which is characterized in that: (A) virtual stress-life curve of a material or a part is obtained by test or technical resources, and the fatigue strength and low amplitude loading range are determined; (B) the low-load strengthening general rule of the material or the part with different strength grades are built according to low-load strengthening performance data of low-strength and high-strength materials or parts by virtue of a numerical method of spline interpolation; (C) the fatigue strength changing rule is built according to the stress-life curve of the material or the part under the strengthening and damaging combined action; in addition, according to the loading grade and frequency of a loading spectrum, the instantaneous fatigue strength value, that is, the residual fatigue strength of the part with given using mileage is calculated; (D) according to the instantaneous stress-life curve, the life evaluation of the material or the part is carried out according to Miner linear damage theory. The invention provides a specific method for the service life of the part and the light-weight design.

Description

technical field [0001] The present invention relates to a method for evaluating the remaining strength and life of materials or mechanical parts, in particular to an evaluation method for low-load strengthening law, remaining strength and life of materials or parts of different strength levels under the joint action of strengthening and damage method. Background technique [0002] In the field of vehicle engineering, the traditional linear and nonlinear fatigue damage theory is only based on the S-N curve or the strain-life curve. The damage of the structure, the residual strength and life evaluation of the structure based on it are often on the safe side, which is not conducive to the lightweight structure design of the car. [0003] 80% of the random loads encountered in the use of automobiles are low-amplitude loads (that is, the amplitude is lower than the fatigue limit), and these loads may strengthen the structure before crack initiation occurs in the structure. (In ...

Claims

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Application Information

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IPC IPC(8): G01N3/00
Inventor 郑松林冯金芝卢曦
Owner UNIV OF SHANGHAI FOR SCI & TECH
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