Abstract

Single edge notch fracture tests have been carried out on rigid polyurethane foam in the density range 32 to 360 kg/m 3. Fracture properties were characterized in terms of the fracture toughness parameter ( K Ic ), the critical strain energy release rate ( G Ic ) and crack opening displacement (c.o.d.). The values of crack opening displacement lead to a proposed mechanism of crack propagation in foams of density greater than about 140 kg/m 3.

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