A STEADY-STATE THERMO-ELASTOVISCOPLASTIC FINITE-ELEMENT MODEL OF ROLLING WITH COUPLED THERMOELASTIC ROLL DEFORMATION

A coupled model of thermo-elastoviscoplastic strip deformation and the rmo-elastic roll deformation is presented. It is based on the 3D FEM. Its purpose is the prediction of profile defects, strain and stress ma ps, including residual stresses, in a hot or cold rolled strip. The em phasis of the present paper is on the development of a pseudo-steady-s tate version of the model, the only way to allow fine enough 3D meshes to be used with acceptable computing times. Non-uniform interstand te nsion fields can be predicted. It is shown that this non-uniformity ma y have a large influence on the computed contact stress maps (3D frict ion hills) and therefore on computed roll deformation and strip profil e. The influence of material behaviour is examined: elastic-plastic or elastic-viscoplastic laws result in very different interstand stress patterns, just as the presence or absence of a yield stress.