Crack tip superblunting: experiment,theory and numerical simulation |
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| Authors: | Yang Wei Guo Tianfu Fu Zengli |
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| Institution: | (1) Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, China;(2) Department of Chemical Engineering, Tsinghua University, 100084 Beijing, China |
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| Abstract: | Experimental revelation ofsuperblunting 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 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.
The project supported by the National Natural Science Foundation of China |
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| Keywords: | crack tip superblunting polyproplene toughening numerical simulation |
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