コースティックス法に関する境界要素解析 : 高速き裂進展鞭性K_<ID>の評価

概要

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An elastodynamic boundary element analysis of a fast crack propagation test is performed. A propagating crack subject to a time-dependent uniform pressure on its surfaces is considered. The crack speed is determined in such a way that the dynamic stress intensity factor K_1(t, v) is equal to the fast crack propagation toughness K_<ID>. Caustics in reflection are generated by making the assumption of plane stress. The time variation of the "measured" K_<ID> is obtained from the diameter of the generated caustics. The K_<ID> thus obtained is found to depend on crack propagation history due to the transient nature of the elastic stress field near a propagating crack tip. This may explain to some extent the physical meaning of the experimental data showing the dependence of K_<ID> on crack acceleration.
社団法人日本機械学会の論文
1992-09-25