Electrofusion (EF) technique has been widely used in polyethylene and its composite pipeline system. The strength of the EF joint is regarded as higher than that of present pipe, for the EF joints are usually failed at the pipe when subjected to internal pressure. However, several recent studies from different researchers have revealed that the EF joint may fail by cracking through the fitting in the long-term hydraulic pressure tests. In this study, the structure parameter and loading condition were taken into consideration to investigate the failure mechanism of this failure mode. The progress of crack initiation and propagation was studied by FEA method and linear elastic fracture mechanics theory. EF joints with different structure and welding parameters were analyzed to find out the design factors which would have major influence on the failure mode of cracking through the fitting. The analytical results show a reasonable agreement with experimental observations, and also reveal that the length of inner cold welding zone has a great influence and should be carefully determined in the designation of EF fittings.
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ASME 2013 Pressure Vessels and Piping Conference
July 14–18, 2013
Paris, France
Conference Sponsors:
- Pressure Vessels and Piping Division
- Nondestructive Evaluation Engineering Division
ISBN:
978-0-7918-5563-8
PROCEEDINGS PAPER
Study on the Failure Mode of Cracking Through the Fitting of Electrofusion Joint
Jinyang Zheng,
Jinyang Zheng
Zhejiang University, Hangzhou, Zhejiang, China
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Xiangpeng Luo,
Xiangpeng Luo
Zhejiang University, Hangzhou, Zhejiang, China
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Jianfeng Shi,
Jianfeng Shi
Zhejiang University, Hangzhou, Zhejiang, China
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Sijia Zhong
Sijia Zhong
Zhejiang University, Hangzhou, Zhejiang, China
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Jinyang Zheng
Zhejiang University, Hangzhou, Zhejiang, China
Xiangpeng Luo
Zhejiang University, Hangzhou, Zhejiang, China
Jianfeng Shi
Zhejiang University, Hangzhou, Zhejiang, China
Sijia Zhong
Zhejiang University, Hangzhou, Zhejiang, China
Paper No:
PVP2013-97172, V01AT01A010; 6 pages
Published Online:
January 17, 2014
Citation
Zheng, J, Luo, X, Shi, J, & Zhong, S. "Study on the Failure Mode of Cracking Through the Fitting of Electrofusion Joint." Proceedings of the ASME 2013 Pressure Vessels and Piping Conference. Volume 1A: Codes and Standards. Paris, France. July 14–18, 2013. V01AT01A010. ASME. https://doi.org/10.1115/PVP2013-97172
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