CAVITY DAMAGE AND DEFOBMATION LOCALIZATION BEHAVIORS OF THE CONSTRAINED BULGIN OF SUPERPLASTIC METAL SHEETS

In this paper, the cavity damage and deformation localization behaviors of the constrained bulging of the cavity-sensitive superplastic metal sheets into cone-desk shape dies are numerically studied by using a largestrain rigid visco-plastic finite element method. Based on the simulation of practical alloy sheets,the influences of the superimposed pressure Ph,the initial cavity growth rate β_0 and the geomletrical shapes of the dies(the cone angle θ and the die heightHp)on the localization and cavity fract...