Abstract
The ductile instability characterization of medium density polyethylene (MDPE) has been studied with theJ integralR curve method. The loading of variously notched samples in three-point bending using a compliant test fixture showed that sudden unstable cracking occurred after the commencement of stable ductile cracking. The tearing modulus which is obtained from theR curve can describe the transition from stable to unstable crack. Instability occurs when an applied situation depending on loading system and/or sample geometry exceeds the tearing modulus of MDPE.
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