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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >Eigenstrain-based model for prediction of laser peening residual stresses in arbitrary three-dimensional bodies. Part 1: model description
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Eigenstrain-based model for prediction of laser peening residual stresses in arbitrary three-dimensional bodies. Part 1: model description

机译：基于Eigenstrain的模型，用于预测任意三维物体中的激光喷丸残余应力。第1部分：模型说明

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摘要

This paper presents a methodology for predicting the residual stress within three-dimensional parts caused by laser peening treatment. The inputs to the model are the elastic material properties and shape of the part as well as an eigenstrain (also called ‘initial strain’ or ‘stress-free strain’) field specific to the material and parameters of laser peening treatment. The eigenstrain field is known from a library of fields developed prior to the residual stress prediction, either from detailed physical process modelling or from residual stress measurements of simple coupons of the parent material subject to the same laser peening treatment. The eigenstrain is assumed insensitive to part geometry, depending only on the part material and the laser peening treatment parameters. Given the eigenstrain field, residual stress is predicted by an elastic finite element analysis of the part that includes its detailed geometry and material composition. The eigenstrain is input into the finite element model in stated treatment areas where laser peening is applied. Solving for stress equilibrium provides an estimate of the residual stress field at all points within the treated part. The proposed modelling procedure is verified through a test on flat-plate geometry, where measured residual stress compares favourably with model predictions. In addition, the model is used to predict the residual stress produced by laser peening of a specimen containing a corner fillet. A companion paper (Part 2) presents detailed experimental verification of the model over a range of common part geometry.
机译：本文提出了一种预测由激光喷丸处理引起的三维零件内残余应力的方法。该模型的输入是零件的弹性材料属性和形状，以及特定于激光喷丸处理材料和参数的特征应变（也称为“初始应变”或“无应力应变”）场。从残余应力预测之前开发的领域库中可以获知本征场，可以从详细的物理过程建模中，也可以从经受相同激光喷丸处理的母体材料的简单试样的残余应力测量中获得。假定本征应变对零件的几何形状不敏感，仅取决于零件的材料和激光喷丸处理参数。在给定特征应变场的情况下，可通过对零件进行弹性有限元分析（包括其详细的几何形状和材料成分）来预测残余应力。在指定的应用激光喷丸处理的区域，将本征应变输入到有限元模型中。解决应力平衡问题可以估算出被处理零件内所有点的残余应力场。通过对平板几何形状的测试对提出的建模程序进行了验证，其中测得的残余应力与模型预测相吻合。此外，该模型还用于预测通过激光喷丸处理包含角圆角的样品而产生的残余应力。随附的论文（第2部分）介绍了在一系列常见零件几何图形上对该模型进行的详细实验验证。

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