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Structural integrity of pipelines: T-stress by line-spring

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The elastic T-stress is an important constraint parameter for characterizing elastic–plastic crack-tip fields and in fracture assessment procedures. However, many of the methods reported in the literature for estimating T-stress are not easily suited for surface-cracked pipes because these are three-dimensional in nature. Here, the line-spring method is demonstrated to be an efficient and accurate tool for the constraint estimation in surface-cracked pipes. Detailed three-dimensional analyses are performed to verify the line-spring results. Using the line-spring method, the effects of different crack geometries and diameter-to-thickness ratio on stress-intensity factor (SIF) and T-stress in circumferentially surface-cracked pipes are examined. Further, a compendium of normalised SIF and T-stress values for surface-cracked pipes in remote tension and bending, calculated from a total of 1000 analyses, is tabulated. Finally, the application of an ‘elastic–plastic’ T-stress under large-scale plasticity is explored.

Keywords: constraint effects; elastic T-stress; line-spring method; surface-cracked pipes; two-parameter fracture mechanics

Document Type: Research Article


Affiliations: 1: The Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, N-7491 2: Sintef Material Technology, N-7465 3: LINKftr AS, N-7491, Trondheim, Norway

Publication date: May 1, 2005

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