ボイド材の構成式を用いたき裂先端近傍の解析

概要

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Large deformation finite element analysis with modified Gurson's constitutive relation was applied to the I void and 2 voids models. Deformation, distribution of equivalent plastic strain and void volume fraction were obtained, and the condition of the localization of deformation given by Rudnicki and Rice was applied to study the possibility of the ductile fracture by the localization. Furthermore, the relation between the diameter of voids and J was compared with the experiments. The results show that the large deformation area, the region of high equivalent plastic strain and the void volume fraction coincide with the localized area. These phenomena are thought to be the precursor phenomena of shear banding. The width of the ligament of cracks and voids becomes narrower due to an increase in J, but it has a certain limit, and this result of analysis shows a quite similar tendency with the experiments.
社団法人日本材料学会の論文
1988-08-15