中国有色金属学会会刊(英文版)
中國有色金屬學會會刊(英文版)
중국유색금속학회회간(영문판)
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2002年
5期
941-946
,共6页
fine-blanking%ductile fracture%finite element method%Gurson plastic potential
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.
