熱応力解析理論に基づくショットピーニング面の残留応力深さ分布推定

Abstract

In the shot peening process, the residual stress on the shot-peened surface and its distribution under the surface are important evaluation items for the high value-added surface creation. In this paper, it was proposed that the residual stress distribution under the shot-peened surface for a thin plate was non-destructively estimated from the measured value of residual stress on the surface and that of the arc height, by applying the theory of linear thermal stress analysis for a thin plate. The analyzed residual stress profile showed good agreement with that of the experimental results obtained from the surface removal by electro-polishing. From the results of analysis, it was found that the depth of compressive residual stress (the depth which changes from the compressive stress to the tensile stress), the residual stress at the depth of the inherent strain and the residual stress on the opposite surface to the shot-peened surface characterizing the profile of residual stress distribution had a relationship with the ratio of a thickness of plate to an inherent strain depth.