Numerical modeling of failure in magnesium alloys during crush simulations
Abstract
Numerical modeling of failure of magnesium tubes during crush simulations is performed for extruded AZ31 magnesium alloy. LS-DYNA material model MAT-124 along with experimental stress-strain data from tensile and compression tests of the extruded tube have been used to capture the asymmetry in the tension and compression response for any strain rate. A combination of three different strain-based and stress based failure criteria has been implemented in the finite element code to trigger element erosion to simulate fracture. The simulations reproduce the experimental observations during axial compression tests of round tubes as well as tubes with square cross section.