Abstract
The plastic deformation of sheet metals with circular perforations in a hexagonal pattern was investigated. The equivalent continuum approach was employed to develop a theoretical model for the global analysis, which includes defining a yield criterion and the associated flow rules in terms of apparent stresses and apparent strains. Detailed investigations, including finite-element analysis and experimental tension tests, were performed also to analyze the local deformation of the subject sheet metal, and the validity of the proposed yield criterion and flow rules was examined.
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