Title: Load predictions for non-isothermal ECAE by finite element analyses

Authors: Il Heon Son, Young Gwan Jin, Jeong Ho Lee, Yong-Taek Im

Addresses: Wire Rod Research Group, Technical Research Laboratories, POSCO, Pohang, Gyeongbuk 790-785, Korea. ' National Research Laboratory for Computer Aided Materials Processing, Department of Mechanical Engineering, ME3227, KAIST, Daejeon 305-701, Korea. ' LG Research Laboratory, Digital Appliance Company, Changwon, Gyeongnam 641-711, Korea. ' National Research Laboratory for Computer Aided Materials Processing, Department of Mechanical Engineering, ME3227, KAIST, Daejeon 305-701, Korea

Abstract: This study is to investigate material flow and load predictions due to different interface conditions between dies and the workpiece for non-isothermal Equal Channel Angular Extrusion (ECAE) process of pure titanium CP-Ti Gr-1 alloy. The change of friction conditions was carefully investigated in terms of variation of load requirements at the beginning stage of deformation and remeshing. In order to validate the numerical results obtained, finite element simulation results were compared with the experimental data. The current investigation clearly showed the importance of proper handling of friction conditions to improve the solution accuracy especially for the ECAE process simulations. The approach will be beneficial in understanding the deformation mechanics and determining the load requirements for the ECAE with the larger specimen for industrial applications to obtain ultra-fine-grained bulk materials. [Received 30 March 2006, Accepted from 22 January 2007]

Keywords: finite element analysis; FEA; modelling; material flow; load predictions; equal channel angular extrusion; non-isothermal ECAE: friction; titanium alloys; load requirements; deformation; remeshing; simulation; ultrafine grained bulk materials.

DOI: 10.1504/IJCMSSE.2007.014875

International Journal of Computational Materials Science and Surface Engineering, 2007 Vol.1 No.2, pp.242 - 258

Published online: 13 Aug 2007 *

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