き裂面に集中荷重が作用する場合のK値推定法について

概要

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Estimating stress intensity factor is essential to discuss a crack growth of welding structure subjected to various external forces and residual stress. Calculating above stress intensity factor of growing cracks by FEM or BEM are almost impossible because the number of element subdivisions renewals of FEM or BEM due to crack growth is so many that it spend long calculation time. On the other hand, if stress intensity factor subjected to concentrated force on crack surfaces is known, we can calculate stress intensity factors subjected to various external forces and residual stress by integrating stress intensity factor subjected to concentrated force on crack surfaces taking into account of stress distributions of noncracked problem of same structural element. In this paper, we suggest a simple estimation method of stress intensity factor subjected to concentrated force on crack surfaces by using stress intensity factor and crack opening profile at one loading condition and some crack length conditions. Then we investigate the validity of this method by showing examples of single edge cracked (SEC) specimen and compact tension (CT) specimen. As a result, it becomes clear that this method gives good estimation results of stress intensity factor subjected to concentrated force on crack surfaces.
社団法人日本船舶海洋工学会の論文
1997-03-29