The time‐temperature dependence of the cohesive fracture energy is deduced from experiments on a centrally cracked sheet of butadiene‐acrylonitrile‐acrylic acid viscoelastic terpolymer crosslinked with an epoxy curing agent. Analytic results based upon a cylindrical flaw model of the crack permit the segregation of the fracture energy time dependence from that of the relaxation modulus.
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Bennett et al. (1970) studied this question.
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