A simplified FEM eigenstrain residual stress reconstruction for surface treatments in arbitrary 3D geometries
A simplified FEM eigenstrain residual stress reconstruction for surface treatments in arbitrary 3D geometries
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DOI：
10.1016/j.ijmecsci.2018.02.016
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发表时间：
2018-04-01
影响因子：
7.3
通讯作者：
Korsunsky, A. M.
中科院分区：
文献类型：
--
作者：
Salvati, E.;Korsunsky, A. M.
残余应力对零部件和装配体的结构完整性具有重要意义。其适当的评估和集成到故障准则可以大大提高工程部件的性能。虽然残余应力的实验测量提供了重要的输入，关键的下一步是将获得的信息纳入数值模拟。本征应变法是一种自洽确定结构残余应力的有效方法，能满足应力平衡和应变协调的力学要求。该方法还能够验证实验数据的一致性。结合本征应变的可转移性原理，它允许将良好表征的材料加工条件应用于不同的固体几何形状，以预测残余应力。在目前的工作中，提出了一种新的用户友好的实施框架，能够预测由于材料表面处理的任意三维几何形状的残余应力场。在第一种情况下，进行了详细的分析潜在的误差来源，然后通过分析文献中的相关案例进行验证的程序的有效性：激光冲击喷丸和渗碳淬火相结合。这里提出的工作开辟了新的途径，使用本征应变方法的真实的工业应用中的机械部件的几何形状通常是复杂的。特别是，它使残余应力集成到完善的有限元疲劳预测代码时，实验数据是有限的。(C)2018爱思唯尔有限公司版权所有
Residual stress is of great significance for the structural integrity of components and assemblies. Its proper evaluation and integration into failure criteria may considerably enhance the engineering parts performance. Although experimental measurements of residual stress provide important input, the crucial next step is the incorporation of the information obtained into numerical modelling. Eigenstrain method is a powerful way of specifying residual stress in structures in a self consistent way that satisfies the mechanics requirements of stress equilibrium and strain compatibility. This approach also enables the verification of experimental data consistency. In combination with the principle of transferability of eigenstrain, it allows the application of well-characterised material processing conditions to different solid geometries with the purpose of predicting residual stress. In the present work, a novel user-friendly implementation framework is presented that is able to predict the residual stress fields arising due to material surface treatment of arbitrary three-dimensional geometries. In the first instance, detailed analysis of potential sources of error was conducted, followed by verification of the validity of the procedure conducted by analysing relevant cases from the literature: laser shock peening and carburising combined with quenching. The work presented here opens new ways to use the eigenstrain method for real industrial applications where the mechanical components geometry is generally complex. Particularly, it enables the integration of residual stress into well-established FEM fatigue prediction codes when the experimental data available is limited. (C) 2018 Elsevier Ltd. All rights reserved.