A linked FEM-damage percolation model of aluminum alloy sheet forming

被引:21
作者
Chen, ZT
Worswick, MJ [1 ]
Cinotti, N
Pilkey, AK
Lloyd, D
机构
[1] Univ Waterloo, Dept Mech Engn, Waterloo, ON N2L 3G, Canada
[2] Queens Univ, Dept Mech Engn, Kingston, ON K7L 3N6, Canada
[3] Alcan Int Ltd, Kingston Res & Dev Ctr, Kingston, ON K7L 5L9, Canada
关键词
ductile damage; damage percolation; metal forming; strain gradient; stretch flange; aluminum alloy sheet;
D O I
10.1016/S0749-6419(03)00061-5
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A so-called damage percolation model is linked with a finite element model of a sheet forming process to offer a comprehensive study of ductile damage evolution. In the current study, a damage percolation code is linked with LS-DYNA, an explicit dynamic FEM code used to introduce local strain gradients and compliance effects due to damage-induced softening. The linked model utilizes a Gurson-based yield surface to account for the softening effects of void damage, while the local damage development and void linkage events are modeled using the damage percolation code. The percolation code accepts detailed second phase particle fields from image analysis of a 2.0 x 1.6 mm optical micrograph of AA5182 aluminum alloy sheet. The model is applied to a stretch-flange stamping process which is known to be a damage-sensitive operation. The critical conditions for fracture are predicted for various initial stretch flange hole sizes. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2099 / 2120
页数:22
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