STP1480: A Robust Structural Stress Parameter for Evaluation of Multiaxial Fatigue of Weldments

    Dong, P.
    Center for Welded Structures Research, Columbus, OH

    Hong, J. K.
    Center for Welded Structures Research, Columbus, OH

    Pages: 17    Published: Jan 2007


    In this paper, the applicability of a new mesh-insensitive structural stress method is examined for the evaluation of multiaxial fatigue behaviors in welded joints. The mesh-insensitive structural stress method proves to be effective in characterizing stress concentration effects in multi-axial fatigue of welded components. In seeking an effective structural stress based fatigue parameter, some well-known published test data were analyzed. These include those published by researchers, e.g., from the Electric Power Research Intitute (EPRI), the Fraunhofer-Institute for Structural Durability (LBF), the University of Illinois at Urbana-Champaign (UIUC), and the Welding Institute (TWI) under bending, torsion, and in-phase and out-of-phase loading combinations. An effective structural stress parameter has then been formulated in a form of a proposed modified Gough's ellipse for considering both in-phase and out-of-phase multiaxial loading conditions. The aforementioned multiaxial fatigue data from a total of five independent sources can be effectively correlated with a structural stress based parameter presented in this paper, without introducing any other material-related empirical parameters. The present method is rather simple to use for day-to-day finite element based fatigue evaluation of welded joints in actual structures subjected to multiaxial loading conditions.


    multiaxial fatigue, mesh-insensitive structural stress method, modified Gough's ellipse, finite element analysis, welded joint

    Paper ID: STP45516S

    Committee/Subcommittee: E08.09

    DOI: 10.1520/STP45516S

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