Title: Physically based constitutive framework for precision metal forming processes

Authors: Zhengfang Qian, Sheng Liu, Han C. Wu

Addresses: Department of Mechanical Engineering Wayne State University, Detroit, MI 48202, USA. ' Department of Mechanical Engineering Wayne State University, Detroit, MI 48202, USA. ' Department of Civil and Environmental Engineering, The University of Iowa, Iowa City, IA 52240, USA

Abstract: A physically based constitutive framework is proposed in this paper for precision metal forming processes. Texture evolution plays a key role for both fully plastic anisotropy and the trigger of deformation bifurcation, which is believed as a bridge to link Rice|s localisation analysis with the M-K analysis for FLD (Forming Limit Diagram). Comparing with the finite element discretisation of 3-D crystal orientations, the proposed analytical approach to texture evolution via ODF (Orientation Distribution Function) can reduce computational time tremendously, in addition to enforcing both numerical stability and accuracy. The constitutive framework has potential for the computer-aided simulation of metal forming processes such as springback prediction, FLD calculation, and optimal die design by implementing the framework in a commercial finite element code. A 2-D analysis of localisation and forming limit is presented to illustrate the proposed approach.

Keywords: deformation bifurcation; metal forming; texture evolution; plastic anisotropy; simulation; forming limit diagrams; die design; springback prediction; net shape manufacturing; crystal orientations.

DOI: 10.1504/IJVD.1999.005599

International Journal of Vehicle Design, 1999 Vol.21 No.4/5, pp.491 - 509

Published online: 21 Oct 2004 *

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