不静定破壊力学の延性破壊強度評価への拡張と応用

概要

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This paper presents a new scheme for the prediction of unstable ductile fracture of statically indeterminate structures. In our previous studies, the method called `statically indeterminate fracture mechanics' was proposed for such structures to evaluate the stress intensity factor and to predict brittle fracture. In this paper, the above method is, at first, extended to evaluate the J-integral of an axially cracked cylinder under body force and internal pressure where a complimentary energy concept based on the deformation theory of plasticity is used to evaluate the J-integral and the deformation of both cracked and uncracked members of structure. Next, the proposed method is applied to the ductile fracture prediction of an axially cracked spinning cylinder, and the following results are obtained. Comparison with round-robin analysis shows the accuracy and the applicable limitation of the proposed method. Discussion on the stress distribution of the cracked section during the present analysis shows the new suggestion of J-controlled crack growth conditions of unstable ductile fracture analysis.
一般社団法人日本機械学会の論文
1991-01-25