This paper summarizes the results of a recent study on a fatigue predictive technique for spot-welded automotive structures. The technique makes use of an equivalent stress intensity factor (Keq) as fatigue parameter for life predictions. A series of fatigue tests were conducted by using different types of fatigue specimens and weld arrangements. Using the raw test data collected, fatigue properties were processed in the form of ΔKeq versus fatigue life by a fracture mechanics based stress intensity factor technique. It is demonstrated that the fatigue properties are consistent among all the specimens tested and relatively geometry-independent. With the stress intensity factor based fatigue properties, the predictive technique was applied to more complex specimens with non-symmetric weld configurations and non-uniform loading conditions (resulting in mixed-mode loading on each weld). The results indicate good correlation between life predictions and test data. Finally, the results of a series of sensitivity studies are presented concerning the effects of various FE modeling details on the accuracy of the predictive technique.


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    Titel :

    Evaluation of Stress Intensity Factor-Based Predictive Technique for Fatigue Life of Resistance Spot Welds


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Zhang, Jinmiao (Autor:in) / Dong, Pingsha (Autor:in) / Gao, Yi (Autor:in)

    Kongress:

    SAE 2001 World Congress ; 2001



    Erscheinungsdatum :

    2001-03-05




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Evaluation of Stress Intensity Factor-Based Predictive Technique for Fatigue Life of Resistance Spot Welds

    Zhang, J. / Dong, P. / Gao, Y. et al. | British Library Conference Proceedings | 2001


    Stress Intensity Factor Based Spot Welds Fatigue Life Prediction Model

    Guo, Haiding / Shi, Yandong | SAE Technical Papers | 2013




    Closed-form stress intensity factor solutions for spot welds in various types of specimens

    Lin,P.C. / Pan,J. / National Chung Cheng Univ.,TW et al. | Kraftfahrwesen | 2008