Experimental revelation of superblunting along plane strain predominant crack tip segment is re- ported here for modified polyproplene.As elucidated by a heuristic model of progressive circumferential cold-draw,the fo...Experimental revelation of superblunting along plane strain predominant crack tip segment is re- ported here for modified polyproplene.As elucidated by a heuristic model of progressive circumferential cold-draw,the formation of superblunting crack tip depends critically on the ratio between the cold-draw prop- agation speed and the loading speed,and contributes significantly to the material toughening,especially for the improvement in impact toughness.Detailed numerical calculations are conducted based on a hyperelastic-viscoplastic and anisotropic damage constitutive model at finite deformation.The simulated results recapitulate the essential features of crack tip superblunting.展开更多
基金The project supported by the National Natural Science Foundation of China
文摘Experimental revelation of superblunting along plane strain predominant crack tip segment is re- ported here for modified polyproplene.As elucidated by a heuristic model of progressive circumferential cold-draw,the formation of superblunting crack tip depends critically on the ratio between the cold-draw prop- agation speed and the loading speed,and contributes significantly to the material toughening,especially for the improvement in impact toughness.Detailed numerical calculations are conducted based on a hyperelastic-viscoplastic and anisotropic damage constitutive model at finite deformation.The simulated results recapitulate the essential features of crack tip superblunting.
