Residual stress in geometric features subjected to laser shock peening
Residual stress in geometric features subjected to laser shock peening
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DOI：
10.1177/0954406214550511
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发表时间：
2015-08
期刊：
影响因子：
--
通讯作者：
M. Achintha;D. Nowell
中科院分区：
文献类型：
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作者：
M. Achintha;D. Nowell
本文报道了激光冲击强化（LSP）应用于关键机体和航空发动机合金时的基本认识的合作研究结果。开发的分析包括明确的模拟喷丸过程中，连同一个简单的本征应变的方法，它可以用来提供一个近似的残余应力场在一些几何形状。这些被选择来代表与服务应用相关的条件下的结构部件的部分。本文表明，本征应变方法可以提供很好的近似应力场在大多数情况下，并可能提供一个计算效率高的工具，探索不同的喷丸策略。显式和本征应变结果表明，LSP过程和几何特征之间的相互作用是很重要的理解组件的后续性能。与工程应用特别相关的是，并非LSP应用的所有实例都可以提供结构完整性的改善。
This article reports selected findings from a collaborative research study into the fundamental understanding of laser shock peening (LSP), when applied to key airframe and aero-engine alloys. The analyses developed include explicit simulations of the peening process together with a simpler eigenstrain approach, which may be used to provide an approximation to the residual stress field in a number of geometries. These are chosen to represent parts of structural components under conditions relevant to service applications. The article shows that the eigenstrain approach can provide good approximations to the stress field in most circumstances and may provide a computationally efficient tool for exploring different peening strategies. Both explicit and eigenstrain results demonstrate that the interaction between the LSP process and geometric features is important for understanding the subsequent performance of components. Particularly relevant for engineering applications is that not all instances of LSP application may provide an improvement in structural integrity.