%0 conference paper,conference lecture %@ %A Siegmund, T.,Bernauer, G.,Brocks, W. %D 1998 %J ECF 12: Fracture from Defects; Proceedings of the 12th Bienniel Conference on Fracture - ECF 12 %N %P 933-938 %T Two models of ductile fracture in contest: porous metal plasticity and cohesive elements %U %X