Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-1199-C7-1209
Numerical modelling of thermomechanical processes related to bulk forming operationsM. SCHÖNAUER1, T. RODIC1, 2 and D.R.J. OWEN1
1 Institute for Numerical Methods in Engineering, University College of Swansea, Singleton Park, Swansea SA2 8PP, Wales, U.K.
2 Faculty for Natural Science and Technology, University of Ljubljana, Askerceva 20, 61000 Ljubljana, Slovenia
A thermomechanically sound, decoupled model, numerically unified for cold and hot bulk metal forming is cast into a finite element formulation. The mechanical module is based on elasto-(visco) plastic material costitutive laws and general interface frictional contact conditions with the assumption of rigid tools. Introduction of a logarithmic strain based finite strain model in the contex of a geometrically nonlinear assumed strain ntethod characterizes the numerical treatment of incompressibility at large deformations. A non-associated slip rule is employed in the contex of the plasticity theory of friction, with nonlinear master segment geometry describing the contact kinematics. Consistent linearisation in all aspects of algorithmic development provides robust and quadratically convergent solutions. This is shown in 2-D plane strain and axisymmetric numerical examples, where simulations of both cold and hot bulk metal forming processes are performed.
© EDP Sciences 1993