摘要
对铝合金管的冲切过程进行了有限元模拟,刀具采用刚体模型,工件采用弹塑性模型,材料断裂破坏采用Normalized Cockcroft&Latham破坏准则。分析了冲切过程中冲切力、等效应力的变化,得出了弹性变形、塑性变形、塑性变形至裂纹扩展、断裂始终贯穿于整个冲切过程之中。通过模拟切口与实际切口的对比、模拟切屑形状与实际切屑形状的对比,说明了模拟过程的有效性。
FEM simulation has been executed on punching process for aluminum alloy tube. The tool adopts the rigid material model and the work piece adopts elastic-plastic material model. Ductile fracture of model takes use of Normalized Cockcroft ＆ Latham criteria. The variation of punching force and flow stress has been analyzed. It is concluded that elastic deformation, plastic deformation, plastic deformation to crack propagation, and material fracture separation are throughout the punching process. Through comparison of simulation incision ＆ chip breaking with the actual ones, the effectiveness of the simulation process has been proved.
出处
《锻压装备与制造技术》
2012年第5期72-75,共4页
China Metalforming Equipment & Manufacturing Technology
