On the dependence of crack surface morphology and energy dissipation on microstructure in ductile plate tearing

The two distinct tearing mechanisms observed in ductile metal plates are the void-by-void advance of crack tip, and simultaneous interaction multiple voids on plane ahead tip. Void-by-void advance, which leads to a cup-cup surface morphology, is dominant mechanism if plate contains low number small void nucleation sites (i.e., second phase particles). Conversely, large and/or size trigger resulting slanted crack. present work aims provide further insight into parameters controlling energy dissipation by focusing shape and, thereby, orientation sites. study uses two-dimensional strain finite element domain model cross section plate, subject mode I tearing, with discretely modeled, randomly distributed, finite-sized elliptic developed setup can capture dependence morphology microstructure plate. simulation results confirm that propagation develops intense plastic straining throughout thinning region cup-cone cracks propagate thin localized shear deformation bands. is, therefore, greater for cracks. demonstrates damage-related has significant role determining overall hardening capacity turn dictates energy.