%0 conference lecture (invited) %@ %A Brocks, W.,Negre, P.,Scheider, I.,Schoedel, M.,Steglich, D. %D 2003 %J Recent Developments in the Modeling of Rupture in Solids, International Symposium %N %P %T Phenomenological and Micromechanical Models for Simulating Ductile Crack Extension in Sheet Metal %U %X