A study of deformation during cold rolling using visioplasticity

A study of the deformation occurring during cold rolling using the experimentally-based visioplasticity technique is described. Aluminium specimens of different work-hardening characteristics and of various thicknesses were rolled with different reductions and various back and/or front tensions. The geometry of the work-piece was such that plane strain was approximated. A grid on the side of the specimen was photographed and its deformation was analysed using the visioplasticity technique. Slip line fields constructed from this information accorded generally with the predictions of Firbank and Lancaster1] and of Collins3], showing similar profiles of roll pressure; similar variations in strain rate were observed.Plastic deformation producing an increase in the thickness of the specimen was found to occur on the exit side of the deformation zone.