Mixed-mode ductile failure analysis of V-notched Al 7075-T6 thin sheets

First, several rectangular thin sheets made of Al 7075-T6 and weakened by blunt V-notches were tested for mixed mode I/II fracture, and the load-carrying capacity and the fracture initiation angles were experimentally recorded. Then, the Equivalent Material Concept (EMC), proposed originally by the first author, was utilized in conjunction with the maximum tangential stress (MTS) and the mean-stress (MS) criteria to predict the experimental results. By approximately 9% and 6.5% discrepancies for the VMTS-EMC and VMS-EMC criteria, respectively, it was found that both criteria could predict successfully the mixed-mode ductile fracture of Al 7075-T6 thin sheets without performing elastic-plastic analyses. (C) 2015 Elsevier Ltd. All rights reserved.