Resumen de A constitutive model for cold deformation of aluminium at large strains and high strain rates

• A temperature-dependent constitutive model for viscoplastic deformation of aluminium based on a single, scalar internal variable is presented. The model is designed particularly for the strains, strain rates, and temperatures important for cold forging. Special attention is paid to the underlying physical processes that determine the flow stress in the metal. The kinetic constitutive equation is based on thermal activation of dislocations over an average potential barrier from various kinds of obstacles. Strain hardening is modelled through the internal variable which represents the increasing height of these barriers. The model is generalized to three dimensions, and it has been implemented in the finite-element code ABAQUS. Simulations of simple forging operations are presented.