Mechanical behavior analysis of buried glass fiber reinforced epoxy composites used in pipelines and comparison with steel

Authors

Master of Mechanical Engineering, Razi University, Kermanshah, Iran.

Abstract

Replacing steel pipes with composites is one way to combat corrosion in fluid transfer pipelines. Glass fiber polymer composites are corrosion resistant and in addition to having high strength, they are a cheaper option than steel pipes. In this paper, the mechanical behavior of composite and steel pipes used in oil transmission pipelines for fault angles at 45, 61, 75° under reverse fault is investigated using Abaqus software. The mechanical strength and maximum displacement size of composite pipes buried under reverse faulting are compared with steel pipes. The onset of damage in GREs and the yielding point of steel were predicted using Hashin’s initiation criteria considering four failure modes and the von Mises Stress, respectively. Quasi-static solution was used to analyze the soil’s behavior due to nature of loading. The yield point of soils was calculated according to Mohr-coulomb. The results showed that In reverse faulting, the compressive force will often be the yielding factor of buried pipes and In order to safely operate the buried pipe, steel pipes should be used at angles above 61° of reverse fault and unidirectional composite pipes at angles less than 61°. In addition, the maximum allowable displacement of the reverse fault at different angles of the fault is at least 70% higher for the unidirectional composite pipes of glass-epoxy fibers than the steel pipes. The results of this study can be used in the design studies of composite buried pipelines in areas with corrosive soils and active fault crossings.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 12, Issue 1
March and April 2022
Pages 35-50

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