Numerical model for bond strength prediction of a cold rolled bimetal plate

Controlling the adherence of a cold roll bonded bimetal plate requires a good understanding of in-bite adhesion mechanisms, as well as of their interaction with macroscopic rolling conditions. A 2D plane strain finite element model simulating bonding and predicting the bimetal plate adherence has been developed for this purpose. It includes an elastoplastic constitutive law (Prandtl-Reuss equations) for he materials to be bonded; rheological and tribological properties of the components have been determined by tension and plane strain compression tests. Contact conditions (including non-penetration) are imposed by a nodal penalty method allowing for a tangential slip at the strip-strip interface as well as on the tool-strips contact surfaces. Bay's welding criterion is used; some modifications have been included for generalization, in accordance with experimental observations. The developed software is tested, and the resulting adherence strength of the bimetal plate is predicted under of roll bonding conditions. (authors)