Failure assessments of porous aluminum sheets under stretching procedures
Journal
Advanced Science Letters
Journal Volume
4
Journal Issue
8-10
Pages
2991-2995
Date Issued
2011
Author(s)
Abstract
A finite element analysis is carried out to assess damage evolution and crack occurrence of aluminum sheets under the hemispherical stretching procedures in the present study. A modified Gurson yield criterion is adopted to account for macroscopic behaviors of the sheet metal with porosity. Plastic responses of the matrix surrounding voids are assumed to follow the planar anisotropic yield function YLD2000-2D. Various void evolution mechanisms including nucleation, growth, and coalescence are implemented into the numerical simulations. The ultimate void volume fraction is set to characterize the failure of elements without load-carrying capacity. Calculated results show that the void growth following the Cocks and Ashby model dominates the corresponding damage accumulation. Rupture locations of the sheet based on the simulations are in fair agreement with those based on the experimental measurements reported in the literature. © 2011 American Scientific Publishers All rights reserved.
Type
journal article