応力場の等価性に基づく界面き裂問題の高精度解析法

抄録

This paper deals with the analysis of the stress intensity factor for interfacial crack in dissimilar materials by using the finite element method. In the present method, the stress values at the crack tip calculated by FEM are used under the same mesh pattern and the stress intensity factors are evaluated from the ratio of stress values at the crack-tip-node between a given and a reference problems. This method is based on the fact that the singular stress field near the interface crack tip is controlled by the stress values at the crack tip calculated by FEM. As the reference problems, a single interface crack in an infinite bi-material plate subjected to tension and shear is selected in this study. The usefulness of the present analysis is verified by the comparing the singular stress distribution of the given problem with that of the reference problem. The calculation shows that the present method has the sufficient accuracy in the interface crack problems under various boundary conditions.