Material Intrinsic Length in Plastic Strain Gradient Theory and Microbending Process of Metal Foils

摘要：

In microbending experiments of metal foils an increase of non-dimensional bending moment with decreasing foil thickness has been observed, which indicates the obvious presence of size effects. It is attributed to plastic strain gradient So a constitutive model taking into account plastic strain gradient together with conventional plastic strain hardening is proposed to analyze the non-dimensional bending moment in microbending process. It is confirmed that the predictions by using the proposed hardening model agree well with the experimental data, while those determined by using conventional elastoplastic model cannot capture such size effects. A semi-empirical expression is reasonable to determine the material intrinsic length as a function of shear modulus, initial yield strength, length of Burgers vector, grain size, and macro geometrical characteristic scale of the specimen.

关键词： microbending plastic strain gradient material intrinsic length

作者: Li Hezong Dong Xianghuai Huang Suxia Alexander Diehl Hinnerk Hagenah

作者单位: Dept. of Plasticity Technology, Shanghai Jiao Tong University, Shanghai, China Dept. of Mechanical and Electrical Engineering, Hebei University of Engineering, Handan, China Chair of Manufacturing Technology University of Erlangen-Nuremberg Erlangen, Germany

会议类型: 国际会议

会议名称: 2010 6th International Conference on MENS NANO,and Smart System(2010年微机电纳米、智能系统国际会议 ICMENS 2010)

会议地点: 长沙

会议语种:英文

页码: 218-221

在线出版日期: 2010-12-14（万方平台首次上网日期，不代表论文的发表时间）