3次元き裂の応力拡大係数の数値解析評価精度の向上について

概要

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A new numerical technique for evaluating the stress intensity factor (SIF) of arbitary 3-D crack is proposed in this paper. This method is based on the solution of an elliptical crack in infinite elastic body under Mode I loading. In an elliptical crack, partial SIFs, K_<Iσ> and K_<Iω>, are derived by fitting the near tip stress and displacement, respectively, distribution in a certain direction to the definition of SIF in plane strain state. A complete SIF, K_I, is calculated with K_<Iσ> and/or K_<Iω> in some arbitrary directions. Because the local front of an arbitary 3-D crack can be approximated by a part of an ellipse, K_I for an arbitrary crack can be calculated approximately by the same technique. These K_I's calculated in some directions include the residual, and need to be evaluated by the value of these residuals. Selected the direction that this value is minimum, a calculated K_I can be optimized. This paper shows some example calculated by this method.
一般社団法人日本機械学会の論文
1999-01-25