NUMERICAL SIMULATION OF THE FORMING LIMIT CURVES OF A HEAT TREATED AA110-H14 ALUMINIUM ALLOY SHEET USING AN EFFICIENT IMPLEMENTATION OF A VPSC BASED MK MODEL

A. DURAN; J.W. SIGNORELLI; D. CELENTANO; M.A. CRUCHAGA; M. FRANCOIS

Barcelona

Congreso; 11th World Congress on Computational Mechanics (WCCM XI); 2014

The objective of this work is to numerically simulate the forming limit curves (FLCs) of a heat treated AA1100-H14 aluminum alloy cold-rolled sheet. To this end, a viscoplastic polycrystalline self-consistent (VPSC) model coupled with the well-known Marciniak and Kuczynski (MK) technique are used. Although the MK-VPSC approach has been successful in predicting realistic FLCs of different materials, the solution process of its classical implementation becomes computationally expensive and is not exempt from some complications of convergence near the failure stage. In order to avoid the resulting iterative procedure, an efficient algorithm is proposed and briefly described in this paper. Moreover, the numerical predictions obtained in this context are experimentally validated with measurements corresponding to hourglass-type (Nakazima) and bulge samples taken at 0°, 45° and 90° with respect to the sheet rolling direction.