Structural part remaining life predicting method based on multi-factor fusion correction

Abstract

The invention discloses a structural part remaining life predicting method based on multi-factor fusion correction. By taking multiple factors influencing the structural part remaining life into account, the structural part remaining life predicting method comprises the following steps: measuring and correcting stress intensity and residual stress of a structural part, calculating stress ratio, calculating size correcting parameters, selecting stress concentration correcting parameters and surface manufacturing quality correcting parameters, and the like. By the structural part remaining life predicting method, the accuracy of a prediction result is greatly improved, so that accurate and effective prediction of the structural part remaining life is achieved.

Description

technical field [0001] The invention belongs to the field of mechanical detection, in particular to a method for predicting the crack growth of structural parts. Background technique [0002] With the progress of society, a large number of equipment are developing in the direction of large-scale. Under such a background, tiny failures will cause huge losses, so it is necessary and urgent to predict the remaining life of equipment or components. With the development of science and technology, people have a deeper understanding of the subject of fatigue, and a series of fatigue life prediction methods have been widely used: such as nominal stress method, local stress-strain method, critical region method, etc. The critical area method is a kind of fatigue life estimation method with engineering application prospect. The stress field strength method and the critical distance method, as two common methods in the critical area method, have been applied in some cases. In engine...

AI Technical Summary

Problems solved by technology

These existing prediction techniques mainly have the following deficiencies: (1) Most of the stress field strength method and critical distance method are only for planar structures, and few structural parts are used as analysis objects. (2) For the traditional nominal stress method, Due to the difference in fatigue performance parameters between structural parts and material samples, the estimation accuracy of fatigue life cannot be guaranteed

(3) The estimation accuracy of the local stress-strain method is high, but its applicability is narrow

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