Numerical modelling of thermomechanical processes related to bulk forming operations

A therir~oir~echanically sound, deco~ipled inodel, nunierically unified for cold and hot bulk metal forming is cast into a finite eleme7it fonttulalioii. Tlie irlechanical niodale is based on elasto(visco)plastic niaterial costztutive laws and general interface frictional contact conditions with the assumption of rigid tools. ~ntroductiolz of a logarithn~ic strain based finite strain iriodel in the contex of a geometrically nonlinear assumed strain niethod characterizes the nu?nerical treatnient of inconipres.sibi~ity at large deformations. A non-associated .slip rule is eniployed in the contex of the plasticity theory of friction, with nonlinear niasler segnlent geometry describing the contact kinematics. Consistent linearisation in all aspects of algorithniic developrrient provides robust and quadratically convergent solutions. This is shown in 2-D plane strain and axisyniirietric n~inlerical exaniples, where sirriulations of both cold and hot bulk nietal fornling processes are perforirird.