Numerical Study on the Size Effect in the Ultra-thin Sheet’s Micro-bending Forming Process

摘要：

Size effect is the most challenging problem for the development of metal micro-forming technologies, and the urgent requirement for understanding the size effect is presented. In this paper, size effect phenomena in the ultra-thin sheets micro-bending forming process are studied numerically based on the strain gradient plasticity. Results showed that sheets mechanical behaviors are strongly influenced by the sheet thickness. When the sheets thickness is close to the material characteristic length, the deflection curve and the distributions of stress and strain are greatly different from those predicted by classical plasticity. If the sheets thickness is greatly larger than the material characteristic length, the size effect disappears and the results tend to be the same as those predicted by classical plasticity. Hence, in the micro-forming process, the size effect should be considered for the selection of the technical parameters.

关键词： micro-forming size effect strain gradient plasticity finite element method

作者: LI Lei ZHOU Qian ZHOU Yiying CAO Jianguo

作者单位: School of Materials Science & Engineering, Henan Polytechnic University, Jiaozuo, 454000, China;Zhej School of Materials Science & Engineering, Henan Polytechnic University, Jiaozuo, 454000, China Zhejiang Copper Processing Research Institute, Hailiang Corporation, Zhuji, 311814, China

会议类型: 国际会议

会议名称: The Fifth International Conference on Physical and Numerical Simulation of Materials Processing(第五届材料与热加工物理模拟及数值模拟国际会议)

会议地点: 郑州

会议语种:英文

在线出版日期: 2007-10-23（万方平台首次上网日期，不代表论文的发表时间）