Abstract
A new temperature-dependent anisotropic hardening and yield function based on non-associated flow rule (NAFR) which accurately describes the anisotropic properties of aluminium alloy sheet metal is presented in this paper. This new NAFR coupling yield function has been successfully implemented in commercial FEM software Abaqus via user material subroutine UMAT to model warm forming of AA5086-H111 aluminium alloy and good agreement was found in the predicted earing profiles and spring-back compared with experiments. The new NAFR coupling yield function has been shown be superior to the existing Hill48 (associated flow rule) yield function making it suitable for FEA of warm deep drawing and design of tooling for various automotive panels and components.
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