Behavior of sheet metal submitted to cyclic bending and stationary drawingdeformation

A sheet metal deformation process based upon bending combined with drawing has been developed with FEM numerical simulation assisted with simple exper imental device. Careful experimental measurements combined with 3D numerica l simulation identified the more relevant parameters and pointed out to sev eral applications, among them controlled work hardening and plastic anisotr opy measurement. Combining a nearly cyclic bending deformation path with a steady-state drawing promotes very high levels of effective strain and stre ss, even without apparent macrostrains. The numerical simulation of bend/drawing forecasts that deformation ratio e psilon (2)/epsilon (3) on the strip is related to the Lankford anisotropy p lastic coefficient measured by the uniaxial tensile test. Experimental meas urements confirm this trend, pointing out to a new method to estimate Lankf ord coefficients. (C) 2001 Elsevier Science B.V. All rights reserved.