CRACK TIP SUPERBLUNTING: EXPERIMENT, THEORY AND NUMERICAL SIMULATION
裂尖超钝化:实验、理论与数值模拟

Experimental revelation of superblunting along plane strain predominant crack tip segment is reported 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 propagation speed and the loading speed, and contributes significantly to the material toughening,especially for the improvement on 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.