STP1526: Experimental and Numerical Analyses of Fatigue Behavior of Welded Cruciform Joints

    Erny, C.
    EA 4325 ENSIETADCNS Ingénierie Navires Armés, Brest Cedex 9Lorient Cedex,

    Thévenet, D.
    EA 4325 ENSIETA, Brest Cedex 9,

    Cognard, J. Y.
    EA 4325 ENSIETA, Brest Cedex 9,

    Korner, M.
    DCNS Ingénierie Navires Armés, Lorient Cedex,

    Pages: 21    Published: Jan 2011


    Abstract

    Ship structures are commonly assembled by using welding process. Due to the swell, all ships are submitted to some variable and complex loadings. The welding process creates specific geometries at the weld toe where local stress concentrations are generated and also creates various mechanical properties in the heat affected zone. Accordingly, welded joints could be a critical area for fatigue damage. In a previous work, a methodology to predict fatigue life has been developed and tested on butt-welded joints. To go further, the present work focuses on more complex assemblies in order to validate this strategy and be able to estimate the fatigue life of representative naval structures. First, the methodology consists of the elastic shakedown study and then of a post-treatment which predicts the fatigue crack initiation. A comparison between experimental and numerical results is proposed in order to present the accuracy of the proposed strategy to predict fatigue life time of welded assemblies typical of shipbuilding applications.

    Keywords:

    fatigue, welded joint, two-scale model, damage, crack initiation


    Paper ID: STP49301S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP49301S


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