Critical assessment of methods for evaluatingJICfor a medical grade ultra high molecular weight polyethylene

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Abstract
Various methods for the evaluation of the critical J‐integralJICbased on the standard ASTM E813–89 are analyzed by conducting investigations on a ductile medical grade ultra high molecular weight polyethylene (UHMW‐PE) at room temperature. Differences inJICreaching almost 50% were recorded between the methods investigated. The controversy surrounding the construction of the crack blunting line is discussed in terms of the stretch zone width together with the size requirements of ASTM E813–89. The findings of this investigation suggest that an R‐curve construction based on mid‐thickness crack growth and ultimate tensile strength (UTS) combined with a blunting line of slope m = 2 and modified exclusion lines provides consistent and conservativeJICvalues. Using this technique, a near plane strain value, smaller than previously published data, of 66.5 kJ/m2was obtained at 23°C.

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