Surfaces produced by guillotining

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Abstract
It is shown that surfaces produced by guillotining steel and lead sheet have distinct regions which reflect the mechanisms by which the edge is produced, namely a period of blade indentation in which the plastic flow field becomes highly localized which in turn causes crack initiation and subsequent separation by fracture. Evidence is produced which hints at the existence of cracks in the soft ductile lead which merely keep pare with the blade and which are not observed in cross-sections through the cut. These observations are related to mechanisms of ductile fracture and continuum mechanics methods of predicting load/penetration behaviour.

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