FLATNESS DEFECTS IN SHEET ROLLING MODELISED BY ARLEQUIN AND ASYMPTOTIC NUMERICAL METHODS

摘要: Rolling of thin sheets generally induces flatness defects due to thermo-elastic deformation rolls. This leads heterogeneous plastic deformations throughout the strip width and then out plane displacements relax residual stresses. In this work we present a new numerical technique model buckling phenomena under stresses induced by rolling process. consists in coupling two finite element models: first one three dimensional based on 8-node tri-linear hexahedron which is used behaviour sheet roll bite; introduce model, from full simulation (a plane-strain elastoplastic model) or an analytical profile. The second shell formulation well adapted large rotations; it will be compute bite. We propose couple these models using Arlequin method. originality proposed algorithm that context method, area varies during Furthermore use asymptotic method (ANM) perform computations taking into account geometrical nonlinearities model. allows solve nonlinear problems high order algorithms presence instabilities. applied some cases where ``edges-waves'' ``center-waves'' are observed.