Abstract
We develop a precise experimental method to measure the full-field heat-generating process near moving (mode I) crack tips in polycarbonate films and present the experimental image of crack tip structure in viscoplastic polymers. A viscoplastic cohesive model is constructed to analyze the mechanical state and temperature increase in near-tip zone during steady crack propagation. The cohesive stress in this model is uniquely characterized by viscoplastic constitutive equation instead of traction-separation displacement relationship or constant yield stress, which greatly differs from previous models. Our proposed model's prediction of temperature increase agrees well with the experimental result.
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