Kosari, Oliphant, Vibien,
Material Science RCP # 2006 Washington DC
The Small Scale Steady State (S4) Rapid Crack Propagation (RCP) test methodology has proven to be an effective tool in assessing resistance to rapid crack propagation. At the same time, an evolution in polyethylene material performance has occurred that has produced materials with increasingly higher resistance to rapid crack propagation. This has resulted in RCP testing of materials at increasingly lower temperatures and increasingly higher pressures, pushing the limits of the S4 test methodology. This paper presents results for developmental PE materials demonstrating the phenomenon of 'false arrest' in S4 Critical Temperature testing and supporting the proposed revision to ISO 13477 of limiting the test pressure in Critical Temperature testing to 5 bar (72.5 psi). A higher Critical Temperature is observed for testing at 10 bar (145 psi) relative to testing at 5 bar (72.5 psi).