X-Ray Measurement of Residual Stresses in a Multi-Layered Sphere

概要

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Many theories of residual stress measurement have already been proposed for plate and cylinder, but only two methods such as the mechanical method by Kawaguchi and the specific volume method by Yonetani are published for a single-layered sphere. In this paper, the authors propose a general formula to calculate residual stresses in a multi-layered sphere by a new method using X-ray, and the formula of industrial use for a single sphere is shown to be reduced to a special case of general one. As the linear expansion coefficient of each spherical layer is different in a general multi-layered sphere, residual stress distributions are affected by thermal stress due to temperature change, so that the authors show also a stress compensating formula for temperature. Finally the authors give two examples of residual stress measurements by applying their new method to chromium deposited steel spheres (SUJ-2) which have been quenched and tempered in different conditions.
一般社団法人日本機械学会の論文