Stress intensity factors for external corrosions and cracking of buried cast iron pipes

Published on Jun 1, 2021in Engineering Fracture Mechanics3.426
· DOI :10.1016/J.ENGFRACMECH.2021.107778
Atika Hossain Akhi (MUN: Memorial University of Newfoundland), Ashutosh Sutra Dhar8
Estimated H-index: 8
(MUN: Memorial University of Newfoundland)
Abstract The municipal water distribution systems across the world include a significant amount of cast-iron pipes. Many of the buried cast-iron pipes are over fifty years old and require rehabilitation. Municipalities decide on a rehabilitation solution between the replacement and re-use of the existing pipes based on the remaining strengths of the pipes. Fracture mechanics has appeared as the most viable tool for remaining strength assessment of the deteriorating pipes. However, a method of assessing the stress intensity factor (SIF) is often not available to municipal engineers to apply fracture mechanics. This paper presents a method for calculating the SIFs of buried cast iron pipes subjected to corrosion and crack on the exterior surface. Different semi-elliptical-shaped defects were characterized using various aspect ratios (crack-depth to crack-length ratio) and relative depths (crack-depth to pipe thickness ratio). The SIFs were assessed for invert/crown and springline position cracks under internal pressure and vertical surface loads. A simplified method is proposed for evaluating the SIFs of buried pipes subjected to the exterior surface defects.
#1Suborno DebnathH-Index: 1
#2Ismail Muftah Ali (MUN: Memorial University of Newfoundland)H-Index: 1
Last. Premkumar Thodi (St. John's University)H-Index: 8
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Municipal water distribution systems in Canada and other countries include a large number of cast iron pipes that were installed almost 50 years ago. For structural integrity assessment of these pi...
#1Weigang Wang (RMIT: RMIT University)H-Index: 5
#2Wei Yang (University of Melbourne)H-Index: 23
Last. Shangtong Yang (University of Strathclyde)H-Index: 14
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Abstract Steel pipes have been widely used in the water and petroleum industries where crack-like flaws have long been recognised as a major cause of their failures. This paper intends to develop a new method for determining the elasto-plastic J-integral of cracked pipes made of all types of steel. A solution to elasto-plastic J-integrals is derived for external longitudinal semi-elliptical surface cracks in pressurised steel pipes. A meshing technique is developed in the detailed three-dimensio...
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#2Chunshun ZhangH-Index: 13
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Field evidence revealed that buried cast iron water pipes can deteriorate through large localized corrosion patches with lengths greater than 1 m, formed by a cluster of small pits. This study inve...
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This study presents a three dimensional finite element method analysis of semi-elliptical surface cracks in pipes under internal pressure load. In the elastic–plastic case, estimates of the J-integral are presented for various ratios including crack depth to pipe thickness (a/t) and strain hardening index in the (R-O) Ramberg-Osgood (n). Finally, failure probability is accessed by a statistical analysis for uncertainties in loads and material properties, and structural reliability and crack size...
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#1Muhammad Wasim (University of Melbourne)H-Index: 8
#2Chun-Qing Li (RMIT: RMIT University)H-Index: 21
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Abstract Corrosion induced degradation of fracture toughness in buried cast iron pipes is a serious concern for structural integrity and smooth operation of buried pipes. External corrosion of pipes is fundamentally governed by the corrosivity of soil which may vary depending on the type of soil and its specific properties. While the corrosion assessments of pipes buried in soil can provide realistic behaviour, the investigations of pipe corrosion in simulated soil solutions are becoming popular...
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#1Bipul Chandra Mondal (MUN: Memorial University of Newfoundland)H-Index: 5
#2Ashutosh Sutra Dhar (MUN: Memorial University of Newfoundland)H-Index: 8
Abstract In the conventional method of analysis for the remaining strength assessment of a corroded pipeline, von Mises failure criterion is used. This continuum-based modelling approach is unable to assess the cracking of the pipeline. In this study, a fracture mechanics approach is used for the assessments of burst pressures of pipelines with corrosion only defects, pipelines with crack-like defects and pipelines with crack-in-corrosion defects. The fracture mechanics approach with the J-integ...
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#2D. Benzerga (University of the Sciences)H-Index: 1
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#1Kasuni T. H. Liyanage (MUN: Memorial University of Newfoundland)H-Index: 2
#2Ashutosh Sutra Dhar (MUN: Memorial University of Newfoundland)H-Index: 8
A number of water main breaks occur every year in municipalities due to ageing, aggressive environmental conditions and undesirable soil conditions. However, the failure mechanism observed in cast iron water mains is often obscure. Non-uniform soil support conditions resulting from the erosion of the surrounding soil by the water escaping from leaks may induce excessive stresses on the pipe wall. Due to partial erosion of backfill soil or the presence of large rock pieces, the localised point su...
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