界面き裂モデルの検討および界面き裂の古典解と修正解の定量的比較

概要

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This paper is concerned with the elasticity solution of a bimaterial interface crack. First, a critical analysis was performed on various interface crack models which were proposed to resolve the well-known contradiction of overlapping of crack surfaces associated with the classical solution by England et al. It was shown that Comninou's model was the most reasonable. Second, the elastic stress field obtained by the classical solution was compared quantitatively with that by Comninou's model for the case of pure tension. It was shown that the former agrees with the latter in the region of r &gsirn; 2_S with accuracy of about 90 % where r is the distance from the crack tip and s is the contact zone size. This result, together with the fact that s is quite small, shows clearly that the classical solution is actually valid in the case of pure tension. Accuracy of the r^<-1/2>-type expression of the stress field of the interface crack was also examined. Finally, definition of the stress intensity factors based on the classical solution was discussed, and a reasonable system of definition was indicated.
一般社団法人日本機械学会の論文
1991-06-25