Abstract
Statistical analysis reveals that mechanical damage is the first cause of incidents on gas transmission pipelines. They can be created by third party activities such as excavator tooth impact or by interaction between the pipe and rocks. To manage the damaged pipeline safely without useless cost, there is a need to investigate the mechanical behaviour of dented pipelines under a varying internal pressure. The purpose of this study is to characterize the stress and strain field around defects in pipes submitted to cyclic pressure loadings in order to estimate their residual lifetime. Full 3D finite element analyses of the denting process followed by cyclic loading are performed. Full-scale experiments on dented sections are planned.
Highlights
Statistical analysis reveals that mechanical damage is the first cause of incidents on gas transmission pipelines
To describe the indentation process, smooth tensile bars and plane strain specimens were tested with a monotonous loading
Due to the production process of spirally welded steel pipes, the supposed anisotropy of the material was tested by testing smooth tensile bars in eight different directions defined by the angle with respect to the rolling direction ( = −26◦, 0◦, 16◦, 32◦, 48◦, 64◦, 77◦, 90◦)
Summary
Statistical analysis reveals that mechanical damage is the first cause of incidents on gas transmission pipelines. The purpose of this study is to characterize the stress and strain field around defects in pipes submitted to cyclic pressure loadings in order to estimate their residual lifetime. Full 3D finite element analyses of the denting process followed by cyclic loading are performed. A series of specimens are machined in pipes from field in order to characterize the mechanical behavior.
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