種々の荷重を受ける共線き裂群および平行き裂群 : ある漸近特性と最大応力拡大係数の計算式

抄録

Previously, Isida analysed a row of equal cracks distributed with equal spacings subjected to tension, in-plane shear, longitudinal shear and classical bending. In all the problems, the stress intensity factors were found to be nearly linear with 1/N for fixed values of λ, where N and λ are the number of cracks and the length-spacing ratio, respectively. In this paper, the relationships between the stress intensity factors and N are given in a more refined manner with theoretical proofs. They apply not only to cracks, but also to holes and inclusions of arbitrary shapes. Based on these relationships, reliable formulae of the stress intensity factors are proposed for collinear and parallel cracks under various loads.