Clarification of the mechanism of fatigue strength improvement by material surface modification based on finite element modeling

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The present study investigated the mechanism of fatigue strength improvement by peening technology used for weight reduction and strength enhancement of metallic materials, such as the materials for aeronautic components, based on finite element modeling. Especially, focusing on the cavitation peening (CP) using locally high impact force generated by the bubble collapsing in a high-speed water-jet, the relationship between the mechanical properties (residual stress, yield stress) evaluated on the surface of the material after CP and its fatigue properties was clarified. Since the grain boundary much affects the plastic properties of polycrystalline metals, the effect of the microscopic factors including grain boundary on the surface mechanical properties after peening were also clarified using crystal-plasticity analyses.