Rapid Crack Propagation and Arrest in Polymers.
WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING
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Published fracture dynamic properties of four birefringent polymers, i.e. polyester resin Homalite-100, epoxy resin Araldite B, modified epoxy resins and polycarbonate, determined by dynamic photoelasticity and dynamic caustics are reviewed. Despite mounting evidence of unique dynamic fracture toughness, KID, versus crack velocity, A, relations of these polymers fractured under static loading, such relations could not be duplicated in fracture specimens loaded dynamically. The existence of unique KID versus A relations and the validity of a minimum dynamic fracture toughness, KIM, as a conservative estimate of the crack arrest stress intensity factor for polymers subjected to dynamic loading remains in doubt. Author