Damage Analysis of Pe Gas Pipelines Under Point Loads

16 Pages Posted: 1 Jun 2023

See all articles by Qiang Pu

Qiang Pu

Southwest Petroleum University

Xia He

Southwest Petroleum University

Wang Guorong

Southwest Petroleum University

Gang Hu

Southwest Petroleum University

Peng An

Southwest Petroleum University

Abstract

Point loads can easily cause stress concentration in pipelines, leading to defects and failures. The proportion of gas pipeline failures caused by point loads has been relatively high in recent years. To investigate the damage of polyethylene (PE) pipes under point loads, tensile tests were conducted at different rates to fit the Suleiman constitutive model parameters. A finite element model of the pipe-soil coupling was then established under point loads. Analyzed the impact of point load position, point load size, internal pressure of the pipeline, and pipeline geometry on the mechanical performance of PE pipes. Based on the DFDI (Ductile Failure Damage Indicator) model and finite element simulation results, the damage of PE pipes under point loads was calculated. The results indicate that the stress-strain relationship of SDR 11 (Standard dimension ratio 11) series PE pipes under the same load conditions are consistent, and the stress-strain curves along the axial direction almost coincide, while the damage degree is also roughly the same. Further analysis showed that the presence of point loads increases pipeline damage, whereas changes in internal pressure have a greater impact.

Keywords: PE gas pipeline, point load, Suleiman model, DFDI model, damage assessment

Suggested Citation

Pu, Qiang and He, Xia and Guorong, Wang and Hu, Gang and An, Peng, Damage Analysis of Pe Gas Pipelines Under Point Loads. Available at SSRN: https://ssrn.com/abstract=4466373 or http://dx.doi.org/10.2139/ssrn.4466373

Qiang Pu

Southwest Petroleum University ( email )

8# Xin du Avennue
Chengdu
China

Xia He

Southwest Petroleum University ( email )

8# Xin du Avennue
Chengdu
China

Wang Guorong

Southwest Petroleum University

8# Xin du Avennue
Chengdu
China

Gang Hu (Contact Author)

Southwest Petroleum University ( email )

8# Xin du Avennue
Chengdu
China

Peng An

Southwest Petroleum University ( email )

8# Xin du Avennue
Chengdu
China

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