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Residual stress redistribution in shot peened samples subject to mechanical loading

机译：机械载荷作用下喷丸处理后样品中的残余应力重新分布

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摘要

Shot peening is a well-established surface treatment process that imparts large compressive residual stresses onto the surface and at shallow depths to retard initiation and growth of fatigue cracks. The plastic deformation developed during the surface treatment sets up a constraint that retains compressive stresses on the surface balanced by tensile residual stresses in the interior. However, component service histories that produce subsequent plastic deformation may redistribute these residual stresses. In most engineering components, this additional plastic deformation is localized to stress concentration sites such as holes, notches, and fillets. In the case of gross plastic deformation where the entire cross section experiences material yielding the residual stress profile may redistribute, resulting in tensile stresses on the outside surface balanced by compression in the interior. This paper describes a series of experiments combined with models to explain the redistribution in residual stress depth profiles subject to applied stresses producing gross plastic strains in shot peened laboratory specimens. The initial room temperature residual stress and plastic strain profiles provide initial conditions for predictions. Model predictions correlate well with experimental results on shot peened dogbone specimens subject to single cycle and fatigue loading conditions at elevated temperature. Experiments on shot peened notched specimens do not exhibit the same stress redistribution even for larger applied stresses.
机译：喷丸处理是一种行之有效的表面处理工艺，可将较大的压缩残余应力施加到表面和浅深度，以延缓疲劳裂纹的产生和扩展。在表面处理过程中产生的塑性变形建立了一个约束条件，该约束条件使表面上的压缩应力保持与内部的拉伸残余应力平衡。但是，产生后续塑性变形的零件使用历史可能会重新分布这些残余应力。在大多数工程组件中，这种额外的塑性变形仅限于应力集中部位，例如孔，缺口和圆角。在大塑性变形的情况下，整个横截面都会经历材料屈服，残余应力分布可能会重新分布，从而导致外部表面上的拉应力通过内部压缩而平衡。本文介绍了一系列与模型相结合的实验，以解释在喷丸处理后的实验室样本中，施加外加应力时会产生总塑性应变的残余应力深度分布的重新分布。初始室温残余应力和塑性应变曲线为预测提供了初始条件。模型预测与喷丸处理的狗骨标本在高温下承受单周期和疲劳载荷条件下的实验结果密切相关。在喷丸处理的缺口试样上进行的实验即使在更大的施加应力下也不会表现出相同的应力重新分布。

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