Full Scale Fatigue Experiment on Submarine Pipelines

Zong Tao Fang; De Yu Tang; Yan Hua Hu; Hu Li Niu

doi:10.4028/www.scientific.net/AMM.633-634.659

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 633-634Full Scale Fatigue Experiment on Submarine...

Full Scale Fatigue Experiment on Submarine Pipelines

Abstract:

This paper focus on fatigue problem of submarine pipelines, four points bending full scale fatigue experiment were conducted on X65 pipelines butt joints specimens, utilizing pipeline full scale fatigue test machine developed by CNPC. Meanwhile contrast test was also carried out on small specimens. The results show that the fatigue strength of full scale welded joints is lower than the small scale joints. Owing to having no regard for the influence of residual stress and size effect, the small test would provide dangerous results. The fatigue property of full scale welded joints only meets the requirement of DNV C203 W3 curve, and meets the needs of DNV C203 F3 curve basically while not meet BS 7608 F2 curve’s requirements which relatively demand higher. Weld toe and geometric discontinuous near weld root is the weak point for the whole welded joints.

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Periodical:

Applied Mechanics and Materials (Volumes 633-634)

Pages:

659-664

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.633-634.659

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Online since:

September 2014

Authors:

Zong Tao Fang*, De Yu Tang, Yan Hua Hu, Hu Li Niu

Keywords:

Full Scale Fatigue, S-N Curve, Weld Toe, Welded Joints, X65 Pipeline

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References

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