Ductile Failure Under Combined Tension and Shear

Abstract

Recent tension-torsion experiments on Al-6061-T6 tubes have shown that strains inside localization zones that precede failure are much higher than previously reported. Furthermore, contrary to some other results, the measured strain at failure monotonically decreases as the triaxiality increases. This paper will review these results and subsequently present numerical simulations that demonstrate that suitably calibrated plasticity models can reproduce the measured deformations. The strains in the simulations approach the values measured at failure without the introduction of damage.