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PENT test versus time to rupture curve for HDPE
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SYSNO ASEP 0354122 Document Type O - Others R&D Document Type Others Title PENT test versus time to rupture curve for HDPE Author(s) Nezbedová, E. (CZ)
Hutař, Pavel (UFM-A) RID, ORCID
Knésl, Zdeněk (UFM-A)Year of issue 2010 Language eng - English Country CA - Canada Keywords HDPE ; crack propagation ; PENT test Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GA106/09/0279 GA ČR - Czech Science Foundation (CSF) GC101/09/J027 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) Annotation The service life for HDPE (PE 80, PE 100) materials used in plastic pipes application covers a time span of up 50 years. The new type of PE 100 (PE 100 RC) should achieve the life time over 100 years. Conventional hydrostatic pressure test to qualify a new resin must last 104 hours (ISO 1167). In the last twenty years two accelerated tests that produce the same type of brittle fracture that occurs in pipes after long time in service were developed and standardized (PENT and FNCT tests). In contrast to FNCT, PENT enables to follow the kinetics of slow crack growth (SCG) and estimates some relevant parameters (time for SCG initiation, rate of SCG and time to failure). These experimentally data, which can be described by exponential relationship in combination with numerical simulation of slow crack growth enable to described the part of time to rupture curve that is responsible for service lifetime. This procedure can substitute time consuming and expensive testing. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2012
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