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首页> 外文期刊>Materials Science and Engineering >Prediction of residual stress relaxations in shot-peened specimens and its application for the rotor disc assessment
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Prediction of residual stress relaxations in shot-peened specimens and its application for the rotor disc assessment

机译：喷丸样品中残余应力松弛的预测及其在转子盘评估中的应用

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摘要

Quantification of shot peening effects in fatigue life prediction becomes increasingly important in industry. The goal of the present work is to find out an engineering method for predicting the residual stress variations and to give a quantitative conservative estimate about the improvement from shot peening. The variations of residual stress caused by shot peening can be described by three sets of ordinary differential equations which have to be solved with the initial residual stresses and the initial plastic strain. It is shown that the equations are valid for materials on free surface and in position where the residual stress reaches maximum value. The equations provide the basis for predicting residual stress variations in the whole shot-peened layer. The nonlinear residual stress variations can be replaced by a multi-linear uniaxial method introduced in the present work. The accuracy of the multi-linear method is verified by detailed finite element computations for uniaxial tension bars and notched specimens. The applicability of the present method to rotor disc is investigated. Discrepancy between the finite element analysis and the multi-linear method is trivial for engine design if the maximum loading strain is limited by 2.5%.
机译：在疲劳寿命预测中，喷丸效果的量化在工业中变得越来越重要。本工作的目的是找到一种预测残余应力变化的工程方法，并对喷丸硬化的改进给出定量的保守估计。喷丸引起的残余应力变化可以用三组常微分方程描述，必须用初始残余应力和初始塑性应变来求解。结果表明，该方程式适用于自由表面和残余应力达到最大值的位置的材料。这些方程式为预测整个喷丸硬化层中的残余应力变化提供了基础。非线性残余应力变化可以用本工作中介绍的多线性单轴方法代替。多线性方法的准确性通过对单轴拉杆和带缺口试样的详细有限元计算得到了验证。研究了本方法对转子盘的适用性。如果最大载荷应变限制为2.5％，则对于发动机设计而言，有限元分析与多线性方法之间的差异是微不足道的。

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