Modeling plastic anisotropy evolution of AISI 304 steel sheets by a polynomial yield function

Abstract In this study, a numerical model for the evolution of plastic anisotropy is investigated purpose stamping method design by Finite Element (FE) analysis and proved experimentally via process simulations cold-rolled austenitic stainless steel (AISI 304) sheet. The sheets described with fourth-order homogenous polynomial yield function modelling approach enhanced strain dependent material coefficients. Tensile tests coupon specimens taken along different directions from rolling direction, flow strength deformation anisotropies are planar variations stress ratio computed at four levels (0.002, 0.02, 0.05 0.18). A new is, then, applied to identify coefficients ensuring an orthotropic positive-definite, convex surface well-defined gradient every loading point on plane subspace. developed computational implemented into general explicit FE software Ls-Dyna user-defined subroutine (UMAT) in simulation AISI 304 rectangular cups house-hold applications. thickness distributions flange geometries were compared measurements it was observed that best predictions done parameters %5 level.