Identification of sheet metal plastic anisotropy, and optimization of initial blank shape in deep drawing

Abstract

The present paper first aims of identifying the anisotropic plastic behavior of metal sheets by combining the results of classical uniaxial tensile tests and of heterogeneous biaxial tensile tests on cruciform specimens. The analysis was performed for both steel sheets and aluminum alloy sheets. Then, the material parameters are used in finite element simulations to predict the formation of ears in the cup drawing test. Very good predictions of experimentally-measured ears are obtained for all materials. Finally, a correction of the initial contour is proposed, which allows us to prevent the formation of ears at the end of the drawing process.