A Software system has been developed which permits fatigue life predictions to be made for automotive spot welds joining two steel sheets, based on finite-element analyses. The method requires the spot welds in a structure to be modelled as stiff bar elements in a relatively coarse mesh, with the bar elements acting as force transducers. The method uses the bar element cross sectional forces and moments to calculate the “structural stresses” in each spot-weld nugget and the adjacent sheets.The system permits the user to play complex loading histories through a finite element model, using either a quasi-static or transient approach to stress history determination. The method provides a convenient way to predict the locations and lives of fatigue sensitive spot welds, and includes graphical tools to assist in interpretation of results. Studies so far indicate that in a typical application such as an automotive body structure, the system correctly identifies all the spot welds that are likely to give rise to durability problems. Using generic S-N curves, life predictions made so far have tended to be somewhat conservative. When S-N curves are used which are more representative of the material from which the component is constructed, more accurate life predictions can be made.


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    Titel :

    A Program for the Fatigue Analysis of Automotive Spot-Welds Based on Finite Element Calculations


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Fermer, Mikael (Autor:in) / Heyes, Peter (Autor:in)

    Kongress:

    Symposium on International Automotive Technology ; 1996



    Erscheinungsdatum :

    1996-10-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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