BIFURCATION AND FRACTURE IN SHEET-METAL FORMING WITH VOID GROWTH EFFECT
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摘要: 用平面应力有限元方法分析空洞模型以模拟一种双相钢板材在成型过程中所遇到的微空洞损伤,经试算可使模型的总体和局部的响应与已有的实验相一致,由此可提供描述该材料的损伤本构参数并研究局部剪切带和扩散型颈缩等分叉现象,临界应变值的分布形成了成型极限图中的下限曲线,当空洞模型的总体应力急剧下降或微裂纹开始出现,其相应的总体应变值提供了上限曲线。Abstract: A plane-stress finite element void model has been employed to simulate the void growth damage during the proportional straining process of a dual-phase sheet metal. The ov-erall and local responses of the model are carefully handled to accord with some existing testing results This procedure provides the means of determining the constitutive parameters that characterize ductile damage. Then, bifurcations intothe modes of localized shear bands and diffuse necking are investigated. The critical strains determ...
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Key words:
- sheet-metal forming /
- void /
- shear band /
- necking
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