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Lifetime prediction of HDPE pipes grade
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SYSNO ASEP 0354108 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Lifetime prediction of HDPE pipes grade Author(s) Nezbedová, E. (CZ)
Hutař, Pavel (UFM-A) RID, ORCID
Ševčík, Martin (UFM-A) RID
Náhlík, Luboš (UFM-A) RID, ORCID
Knésl, Zdeněk (UFM-A)Number of authors 5 Source Title European Conference on Fracture, 18. - Berlin : Deutscher Verband fur Materialforschung und prufung e.V, 2010 / Klingbeil D. ; Vormwald M. ; Eulitz G. - ISBN 978-3-00-031802-3 Pages s. 1-9 Number of pages 9 s. Publication form CD-ROM - CD-ROM Action 18th European Conference on Fracture Event date 30.08.2010-03.09.2010 VEvent location Dresden Country DE - Germany Event type WRD Language eng - English Country DE - Germany Keywords HDPE ; creep crack ; time to rupture curve ; PENT test ; pipe failure Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GA106/08/1409 GA ČR - Czech Science Foundation (CSF) GC101/09/J027 GA ČR - Czech Science Foundation (CSF) GA106/09/0279 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) Annotation This paper presents the results of notch tests on single edge notch specimen under condition corresponding to the PENT approach, i.e. at temperature 80°C and nominal stress 2,4 MPa. Tests were performed for one monomodal and two bimodal HDPE materials, both from structural and fracture mechanics point of view. The dependence of a crack opening displacement COD vs. time was measured and the values of the rate of the stable crack growth rate da/dt and time to fracture tf were estimated. To estimate the residual life of pipes the finite element model with an initial defect was suggested and the values of the stress intensity factor K have been calculated. The computation took into account the change of the crack shape during its growth in the pipe. For assessment of the residual service life of pipes the relation da/dt = A (K)m was applied. The values of the pipe life-time for three studied materials are compared and diagram of the hoop stress versus failure time is presented. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2011
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