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Shannon, Benjamin
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2018New laboratory test facility developed to investigate the leak-before-break window of large-diameter cast iron water pipescitations
- 2017Introduction of the leak-before-break (LBB) concept for cast iron water pipes on the basis of laboratory experimentscitations
- 2017Classification of major cohorts of Australian pressurised cast iron water mains for pipe renewalcitations
- 2017Experimental evaluation of bursting capacity of corroded grey cast iron water pipelinecitations
- 2017Numerical interpretation of pressurized corroded cast iron pipe testscitations
- 2016Lessons learnt on pipe failure mechanisms from observation of exhumed cast iron pipes
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article
Numerical interpretation of pressurized corroded cast iron pipe tests
Abstract
<p>Pitting/patch corrosion is a major and common cause of leaks and (or) bursts in cast iron (CI) pipes that consist of over 50% of global pipelines. The determination of the remaining life of a CI pipe is a major challenge facing water utilities requiring an estimate of the impact of pitting corrosion on the degradation of structural pipe capacity. This paper uses an efficient finite element analysis (FEA) to model the behaviour of large diameter CI pipes with natural or simulated corrosion pits and patches. The test results were obtained through laboratory pressure testing. Laser scanning was used to develop three dimensional geometric models of pipe specimens for direct use in the numerical modelling. The CI material was simulated by a non-linear hyperbolic elastic model (termed MHM-CI) recently developed by the authors for CI pipe modelling. The numerical results showed that the proposed FEAs with the MHM-CI model are reasonably capable to predict the measured responses with increasing water pressure, importantly at the critical pipe corrosion patches, such as hoop strains, initiation of leak and burst failures. The initiation of fracture was explained by material failure purely by tension, which can form a crack that could lead to water leakage. Final burst possibility was modelled by using a simplified fracture mechanics approach to determine the critical crack length for spontaneous fast fracture as in a burst. Our numerical findings suggest that the proposed simplified numerical approach may be used to determine whether a corroded cast iron pipe would leak before break provided that the corrosion condition of the pipe and the relevant material properties are available. However, the window of time for leak before break would require further testing since this would be governed by sub critical fracture growth subject to repetitive external and internal pipe loadings.</p>