Multi-scale crystalline plasticity Finite Element analysis of texture evolution in drawing process

Authors

  • Eiji Nakamachi Doshisha University, Kyotanabe, Kyoto, Japan
  • Takashi Yoshida Doshisha University, Kyotanabe, Kyoto, Japan
  • Hiroyuki Kuramae Osaka Institute of Technology, Osaka, Japan
  • Toshishiko Yamaguchi Doshisha University, Kyotanabe, Kyoto, Japan
  • Yusuke Morita Doshisha University, Kyotanabe, Kyoto, Japan

Keywords:

two-scale analysis, Finite Element Method, optimum design, drawing process, texture evolution, crystal plasticity, process metallurgy

Abstract

The crystallographic control technology in the aluminum wire drawing process is a key technology in the aluminum industries, which produces high-strength bars and wires for the electric, automotive and aircraft parts. A newly proposed “process metallurgy” computational technology in the industrial forming process consists of the two-scale finite element (FE) analyses and the texture evolution prediction scheme. We developed two-scale FE analyses code based on the crystallographic homogenization method by considering the hierarchical structure of polycrystal aluminum material. It can be characterized as the combination of two-scale structure, such as the microscopic polycrystal structure and the macroscopic elastic plastic continuum. Micro polycrystal structure is modelled as a three dimensional representative volume element (RVE). RVE is featured as 3×3×3 (totally 27) eight-nodes solid finite elements, which has totally 216 crystal orientations. This FE analyses code can predict the deformation, strain and stress evolutions in the wire drawing processes in the macro-scale, and simultaneously the crystal texture and hardening evolutions in the micro-scale. In this study, we analyzed the texture evolution in the “three passes” wire drawing processes under conditions of specified drawing angles of die. We evaluated the texture evolution in the surface and center regions of the wire cross section, and to clarify the effects of processing conditions on the texture evolution.

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Published

2018-05-01