The present study develops a model to correlate the self-excited panel motion with the cyclic elastoplastic behaviour of the material causing fatigue failure. The analysis takes into account the elastic and plastic responses of materials to estimate the fatigue life of the panels subjected to limit-cycle oscillations (LCO). A damage-dynamics analysis is performed to correlate the fatigue life of a two-dimensional panel as it is subjected to the dynamic bending-stretching loads due to air flowing above the panel. From dynamic time history of the panel motion, the cyclic strain/stress histories required for fatigue damage analysis have been obtained. To assess the fatigue life of panels, an energy-critical plane fatigue damage parameter has been applied. The total damage accumulation in the loading history is computed from the summation of the normal and shear energies on the basis of cycle-by-cycle analysis. The fatigue parameter used in this study has been used to successfully predict the life of thin aluminium 7075-T6 panel subjected to the dynamic bending-stretching loads due to air flowing above the panel.


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    Title :

    Material cyclic behaviour of panels at supersonic speeds


    Contributors:

    Published in:

    Publication date :

    2004


    Size :

    7 Seiten, 6 Bilder, 1 Tabelle, 19 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English