STP969

    Mixed-Mode Stress-Intensity Factor Solutions for Offshore Structural Tubular Joints

    Published: Jan 1988


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    Abstract

    Accurate calculations of the stress-intensity factors (K) are essential for assessment of the integrity of structural components containing crack-like defects. For the complex tubular joints used in the construction of offshore structures, accurate K solutions do not exist. Only limited results using empirically derived K values are available in the literature. This paper presents a methodology for the mixed-mode K solutions for a surface crack at the weld toe of tubular joints. Example solutions were developed for tubular X-joints under brace tension and in-plane bending using three-dimensional finite-element analyses. The complex finite-element mesh was generated using a special mesh generator. The K values were obtained from the displacement solutions of quarter-point crack-tip elements. The results demonstrate the validity of the solution scheme and contribute to the understanding of the crack-tip behavior of tubular joints.

    Keywords:

    stress-intensity factors, mixed mode, tubular joints, offshore structures, fatigue analysis, fracture mechanics


    Author Information:

    Rhee, HC
    Senior engineering scientist and section director, Production Research and Development, Marine and Materials Section, Conoco Inc., Ponca City, OK

    Salama, MM
    Senior engineering scientist and section director, Production Research and Development, Marine and Materials Section, Conoco Inc., Ponca City, OK


    Paper ID: STP33100S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP33100S


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