主として全体的Jスカラーの使用による有限要素三次元J積分解析

概要

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The local J-vector, J_<local>, can be defined for three-dimensional cracks at any point on a crack front. The numerical determination of the J-value along the crack front is usually based this expression of J_<local>. The authors have previously proposed an alternative method, i.e. the global J-scalar method, for determining the J-distribution along the crack front. In this paper, elastic and elastic-plastic stress-strain and J-integral analyses were performed for center-cracked panels and plates with semi-circular surface cracks, by combining three-dimensional FEM techniques with the global J-scalar method. The J-distribution was expressed by a series of functions. It was found that good accuracies can be obtained if suitable functions are selected for the description of the J-distribution. The global J-scalar method was rather insensitive to intrinsic numerical errors involved in the FEM calculations, as compared with the usually employed local J-vector method, and is thought to be a promising J-evaluation method.
1986-04-25