Influence of Flaw Location on Fracture of A6061-T6 Aluminum-alloy Plate with a Fillet under Monotonic and Cyclic Bending

Abstract

Bending of a less ductile aluminum alloy A6061-T6 is conducted to investigate the effect of initial surface flaw on fracture. A prediction of surface cracking by means of Oyane's criterion, which is based on void growth and under triaxial stress state, is attempted. The initiation and growth of crack is strongly affected by the location and the depth of the initial surface flaw. The cracking deflection predicted by Oyane's criterion is much smaller than the experimental observation.