A plane-strain elastoplastic finite-element model for cold rolling of thin strip

Abstract In cold rolling of thin strip, elastic roll deformation is a prominent phenomenon which may indeed govern the whole process. Analysis of the literature suggests a number of methods to solve this coupled problem; for the most severe operations, the coupling technique is more important than the precision of the computation of stress and strain. To perform as general an analysis as possible, a completely coupled finite element model is formulated, meshing a global strip-roll system with internal interface with sliding and friction. The model is two-dimensional and only analyzes roll flattening. The basic equations and numerical formulation are described. Application to several kinds of rolling passes is examined (temper rolling, thin foil rolling) with special emphasis on roll deformed shape and behaviour of metal in the roll gap (sliding/sticking zones, elastic/plastic zones).

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