Development of Micro/meso-cale Forming Analysis

提出了一种在微细观尺度上考虑变形和摩擦尺寸效应的成形分析方法。利用第一性原理电子态计算确定的工具/材料界面原子间相互作用势进行分子动力学计算，估算了材料表面各晶向的摩擦系数。将这些摩擦系数应用于考虑晶体塑性的有限元多晶模型方法。该方法可以分析局部和历史不同摩擦状态对变形各向异性的影响。为了验证这一分析方法，还提出了用接触电势差测量粘着过程的方法和直接测量作用在刀具表面的摩擦力的方法。

A forming analysis method considering size effects of deformation and friction appearing in micro/meso-scale has been developed. Molecular dynamics calculations using interatomic potentials for tool/material interfaces that were determined by first principles electronic state calculation were used to estimate the friction coefficients for each crystallographic orientation of material surface. These friction coefficients were applied to the finiteelementpolycrystal-model method considering crystal plasticity. The developed method can analyze the effect of locally and historically different friction states on deformation anisotropy. For verification of this analysis method, a measuring method for adhesion process using contact potential difference and a direct measuring method for friction force acting at tool surface were also developed.