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Failure evaluation of high strength pipeline with equal depth circumferential surface crack

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Document pages: 11 pages

Abstract: In the long-distance oil and gas transportation system, the application of high-strength pipeline steel can effectively reduce the construction and operation cost by increasing the operating pressure and reducing the thickness of small pipe wall. Failure assessment is an important issue in pipeline design, construction and maintenance. The annular surface small crack with constant depth in welded pipeline has practical significance. This work provides an engineering estimation program based on Ge EPRI method, which is used to determine the J-integral of thin-walled pipeline with small equal depth circumferential surface crack under tensile and bending loads. The elastic influence function value of stress intensity factor and the plastic influence function value of total stress intensity factorlastic J-integral estimation are derived in tabulated forms through a series of three-dimensional finite element calculations for different crack geometries and material properties. To check confidence of the J-estimation solution in practical application, J-integral values obtained from detailed finite element (FE) analyses are compared with those estimated from the new influence functions. Excellent agreement of FE results with the proposed J-estimation solutions for both tension and bending loads indicates that the new solutions can be applied for accurate structural integrity assessment of high-strength pipelines with constant-depth circumferential surface cracks.

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