自動車用板材の塑性特性評価のためのEBSD・結晶均質化有限要素解析(<小特集>結晶回折法および電子線後方散乱法による材料評価)

概要

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In this study, multi-scale analyses, by using the crystallographic homogenization based semi-implicit finite element code, have been carried out to indicate initial yield surfaces, r-values, plastic strain induced texture evolutions and macro-continuum yield loci of five kinds of automotive sheets, such as DQSK, DP600, HSLA, A6022s, which are NUMISHEET 2005 benchmark materials. We measure the crystal orientation distributions, shapes and boundaries of crystal grains by using scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) apparatus. It can characterize the inhomogeneity of the crystal aggregation, and simultaneously the representative volume element (RVE) of micro-structure, which satisfy the periodicity condition, can be defined. This procedure is featured as a scaling up from the micro-crystal to macro-continuum structures. The Kinematic hardening crystal plasticity constitutive equation is introduced to our multi-scale FE code for evaluating the above mentioned macro properties of sheet metals. The comparison of the plastic anistoropy and formability of these automotive sheets reveals that a newly proposed asymmetrically rolled aluminum sheet has a possibility for the light weight sheet with a high drawability material.
社団法人日本機械学会の論文
2008-03-25