Method for rapidly and nondestructively prediction of residual strength and residual lifetime

A prediction method and strength technology, applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve the problem that the prediction of the remaining strength and remaining life of parts is too safe, and does not consider small loads, etc., to achieve fast and non-destructive remaining fatigue life predicted effect

Inactive Publication Date: 2010-07-07
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the traditional fatigue theory is still used and the strengthening of small loads is not considered, the prediction of the remaining strength and remaining life of the parts is often on the safe side

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The present invention will be further described below in conjunction with specific examples.

[0014] Taking the constant-amplitude strengthening load spectrum of No. 20 steel material sample as an example, the fast and non-destructive prediction method of residual strength and residual fatigue life is as follows:

[0015] The non-destructive prediction steps of remaining strength and remaining fatigue life are:

[0016] (1) Measure the stress-life curve of the material, that is, the S-N curve;

[0017] (2) Measure the change of surface hardness and residual strength of materials in different strengthening processes, analyze and establish the corresponding relationship between the change of surface hardness and residual strength of materials or parts in strengthening, damage and random loads containing small load strengthening through test data ;

[0018] (3) The surface hardness is measured under different strengthening times, and the residual strength is quickly and...

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PUM

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Abstract

The invention discloses a method for predicting the residual intensity and the residual service life rapidly and intactly, comprising the following steps that: firstly, the stress-service life curve of a material or a part, i.e. the S-N curve, is measured; secondly, the corresponding relation between the surface hardness and the residual intensity of the material or the part under a random load spectrum of reinforcing, damaging and considering small load strengthening is established; thirdly, the surface hardness in the process of using the material or the part is measured, according to the corresponding relation between the surface hardness and the residual intensity of the material or the part, the residual intensity of the material or the part is predicted rapidly and intactly; forthly, the residual service life of the material or the part under the different load spectrum is predicted rapidly and intactly by adopting the predicted residual intensity and the stress-service life curve of the material or the part, that is the S-N curve. The rapid and intact prediction of the residual intensity and the residual service life of the material or the part can be realized by the simplemeasurement of the surface hardness by adopting the method.

Description

technical field [0001] The present invention relates to a non-destructive prediction method of remaining strength and remaining life, in particular to a non-destructive prediction method of remaining strength and remaining fatigue life based on surface hardness. Fast, non-destructive prediction of process hardening, strengthening of non-process hardened steel materials or components, damage, and residual strength and remaining fatigue life in a random load spectrum. Background technique [0002] For a long time, a lot of work has been done on the prediction of the remaining strength and remaining fatigue life of steel materials or parts at home and abroad, and a variety of methods for predicting the remaining strength and remaining fatigue life of steel materials or parts have been obtained. However, the existing methods do not consider the strengthening of small loads below the fatigue limit during use, but only consider the damage caused by the load, and most of them separ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00
Inventor 卢曦郑松林
Owner UNIV OF SHANGHAI FOR SCI & TECH
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