Fatigue life prediction method considering laser shock peening effect

Abstract

The invention discloses a fatigue life prediction method considering a laser shock peening effect, and the method comprises the following steps: obtaining the distribution of a residual stress field and a work hardening field after the surface peening of a material after the laser shock peening; the method comprises the following steps: introducing a residual stress field and a work hardening field caused by laser shock peening into a finite element model, simulating stress-strain distribution and evolution under a fatigue load through a finite element, and establishing SWT damage parameters based on a critical plane method; residual stress and work hardening are considered in the SWT fatigue life prediction criterion; fitting unknown material parameters in the corrected SWT fatigue life prediction criterion to obtain material parameters in the corrected SWT fatigue life prediction criterion; and utilizing the obtained corrected SWT fatigue life prediction criterion to predict the fatigue life of the material after laser shock peening. According to the method, the service life of the laser shock peening structure can be accurately predicted.

Description

technical field [0001] The invention relates to a fatigue life prediction model which can consider the influence of residual stress field and work hardening field caused by laser shock strengthening, and belongs to the field of structural strength and finite element numerical simulation. Background technique [0002] The aero-engine turbine disk is subjected to high temperature and high stress during the working state. Although most of the turbine disk is guaranteed to be in an elastic state during operation during the design process, such as the position of the hole edge of the turbine disk and the connection parts of the tongue and groove are The stress concentration area is often in a plastic state during operation, so it is easy to become a crack initiation location and lead to fatigue failure of the roulette. In order to reduce the risk of fatigue failure caused by stress-concentrated parts of the turbine disk, laser shock strengthening treatment can be carried out on t...

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Problems solved by technology

[0003] At present, there have been many research results on the fatigue performance of various metal materials after laser shock strengthening under different conditions, but there are few patents on the fatigue life prediction model of materials after laser shock strengthening. Currently, there are only application numbers The CN202110067373.0 patent "Rapid prediction method and device for crack propagation life of laser shock strengthening components" considers the impact of laser shock strengthening on the extended life of components, and there is no technology for predicting the life of materials by laser shock strengthening, so it needs to be actively developed and considered Fatigue Life Prediction Model of Material Structures Based on Laser Shock Hardening Effect

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