Investigation on ductile fracture in fine-blanking process by finite element method

来源期刊：中国有色金属学报(英文版)2002年第5期

论文作者：李昱明 彭颖红

文章页码：941 - 946

Key words：fine-blanking; ductile fracture; finite element method; Gurson plastic potential

Abstract: In order to continuously analyze the whole fine-blanking process, from the beginning of the operation up to the total rupture of the sheet-metal, without computational divergence, a 3-D rigid visco-plastic finite-element method based on Gurson void model was developed. The void volume fraction was introduced into the finite element method to document the ductile fracture of the sheet-metal. A formulation of variation of the rigid visco-plastic material was presented according to the virtual work theory in which both the effects of equivalent stress and hydrostatic pressure in the deformation process were considered. The crack initiation of the sheet was predicted and the crack propagation was geometrically fulfilled in the simulation by separating the nodes according to the stress state. Furthermore, the influences of different state-variables on the deformation process were also studied.