Abstract
During sheet metal forming operations, internal damage occurs as a result of nucleation, growth and coalescence of cavities around particles, inclusions or second phase. In this work, this phenomenon is experimentally studied by relative density change measurements and scanning electron microscope observations in a dual-phase steel sheet. It is observed that the distribution of cavities is not homogeneous. A model of plastic flow localization is proposed taking account of a non-uniform void distribution. The results show a substantial reduction in the formability of the sheet as well as anisotropic effects due to the heterogeneous distribution of voids.
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