Deformation and fracture behavior of magnesium structural components

The deformation and fracture behavior of the magnesium cast alloy AM 50 was characterized by tension tests with round and flat tension specimens as well as by punch tests. The influence of the stress triaxiality on the damage development was systematically investigated. Both the forming limit diagram and the Gurson damage model were applied to simulate the fracture behavior of the material. To validate the applicability of both damage concepts to crash simulations, component tests under three point bending and compression were performed and simulated with the finite element program PAM-CRASH. The global and local responses of the components predicted by the Gurson model agree with the measurements very well. The important advantages of the Gurson damage model are that it describes the influence of the deformation history and the experimental expenditure for the determination of the damage parameters is much smaller than for the forming limit diagram.