The effect of corrosion patch geometry on stress intensity factors for external surface cracks in cast iron water mains

Chamal Randeniya, D. J. Robert, Guoyang Fu, Chun Qing Li

Research output: Contribution to journalConference articleOther

Abstract

Stress intensity factors play a vital role in predicting the failures of cast iron water mains which are being utilised as buried water pipes worldwide since several decades. The corrosion patterns which can vary from uniform, pitting and/or patch, may result uneven pipe thickness affecting the prediction of stress intensity factors. An inaccurate prediction of stress intensity of the corroded pipes can mislead condition assessments/failure predictions of buried pipes, resulting severe socio-economic losses due to unexpected failures. The objective of this paper is to study the effect of external corrosion geometry on stress intensity factors for external surface cracks in cast iron water mains using finite element (FE) modelling. In this study, spherical patch geometry is adopted using a 3-D FE model to characterise external corrosion of buried pipes. Results from the study revealed that corrosion geometry has a significant effect on the stress intensity induced due to external surface cracks. The findings can be used to evaluate the variation of stress intensity factor of external surface cracks with variation of corrosion geometry.

Original languageEnglish
JournalSustainable Construction Materials and Technologies
Volume2016-August
Publication statusPublished - 1 Jan 2016
Externally publishedYes
EventInternational Conference on Sustainable Construction Materials and Technologies 2016 - Las Vegas, United States of America
Duration: 7 Aug 201611 Aug 2016
Conference number: 4th

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