Abstract: A plane-stress finite element void model has been employed to simulate the void growth damage during the proportional straining process of a dual-phase sheet metal. The ov-erall and local responses of the model are carefully handled to accord with some existing testing results This procedure provides the means of determining the constitutive parameters that characterize ductile damage. Then, bifurcations intothe modes of localized shear bands and diffuse necking are investigated. The critical strains determ...