Influence of damage and texture evolution on limit strain in biaxially stretched aluminum alloy sheets

A numerical code has been developed to calculate limit strains of textured aluminum alloy sheets. This code is based on the Marciniak-Kuczynski (M-K) model, but allows for void nucleation and growth so that both limit strain and fracture strain can be predicted. The strain induced void nucleation model was employed together with the Cocks and Ashby's void growth model. The influences of initial texture, texture evolution, and void nucleation and growth during deformation on the limit strains of an A-Mg alloy were all investigated. Satisfactory agreement was obtained between the predictions and measured data. It was also shown that the introduction of void damage into the old M-K model can lead to more reasonable and accurate predictions. (C) 1998 Elsevier Science S.A. All rights reserved.