Fracture Mechanics Lifetime Prediction of Polyethylene Pipes
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 10, Issue 1
Abstract
Polyethylene pressure pipes are designed for service lives of at least 50 years. While so far lifetimes have been assessed by pipe pressure tests, due to improved slow crack growth (SCG) resistance and increased testing times such tests are not suitable anymore for modern pipe grades. The paper presents an alternative methodology for lifetime prediction, combining practical advantages of the cyclic cracked round bar (CRB) test and linear elastic fracture mechanics. A major advantage of this procedure is that material characterization is done at ambient temperatures. The key challenge in this context is to measure SCG rates in CRB specimens. After determination of crack kinetics at different dynamic loading ratios, material laws for SCG at static loading are extrapolated. Based on the stress intensity factor concept and realistic considerations of initial defect size and changing crack front geometry, pipe lifetimes of four different PE pipe grades are predicted. The results show that for all materials the required minimum lifetime of 50 years will be reached and under practical assumptions even 100 years will be exceeded.
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Acknowledgments
The research study described in this paper was performed at the Polymer Competence Center Leoben GmbH (PCCL, Austria) within the framework of the COMET-program of the Federal Ministry for Transport, Innovation, and Technology, and the Federal Ministry for Economy, Family, and Youth with contributions by the Department of Polymer Engineering and Science, University of Leoben (Austria). The PCCL is funded by the Austrian government and the state governments of Styria and Upper Austria.
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Journal of Pipeline Systems Engineering and Practice
Volume 10 • Issue 1 • February 2019
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©2018 American Society of Civil Engineers.
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Received: Aug 24, 2017
Accepted: Jul 10, 2018
Published online: Oct 31, 2018
Published in print: Feb 1, 2019
Discussion open until: Mar 31, 2019
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