A Study of the J-Integral Method Using Polycarbonate.

Abstract
In this experimental program the crack-growth resistance of a model material, polycarbonate, was investigated using the J-integral method. Deeply cracked, three-point-bend specimens having crack lengths ranging from 0.6 to 0.8 of the specimen width and thicknesses ranging from 1 to 0.125 in. were tested. The J-integral was found to provide a good measure of crack initiation and growth in polycarbonate. Over these ranges, no effect of thickness or crack length on the fracture behavior was found. The J-integral value of the fracture toughness was 9 psi-in. at the beginning of crack growth, 25 psi-in. at 2% crack growth, and 41 psi-in. at pop-in. The crack growth followed an exponential relation with J. Data in the literature on other materials also obeyed an exponential relation. This relation was used to evaluate J(IC) and to extend the application of the tearing modulus.

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