コースティックス法によるモード I, II および III 荷重下における応力拡大係数の測定に関する実験的・数値解析的検討

概要

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The experimental method of caustics is a useful technique for the determination of the stress intensity factor K. In this paper, the stress intensity factors under mode I, II and III loadings are measured by the method of caustics, and the effect of those loading modes on the measurement accuracy is experimentally and numerically examined. Furthermore, a numerical method based on the 3-D finite element method (3D-FEM), which can directly simulate the caustic images, is proposed. As a result, it is found that the minimum initial curve radius γ^<min>_0 obtained in this study depends on the type of loading that is of mode I or mode II. In the case of mode III loading, however, the measured value of K agrees with the theoretical one regardless of the change of the initial curve radius γ_0. And the simulated results are in good agreement with the experimental images.
社団法人日本材料学会の論文
2003-12-15