Separation of spot welded joints under impact is investigated with regard to geometry, loading configuration, steel grades and the rate effect. Test data were analyzed to reveal the governing parameters that could be useful in predicting dynamic structural behavior of spot welded vehicles. The following conclusions are obtained: For the first time, the loading rate is identified as a critical parameter in quantifying the dynamic pullout separation of spot welded joints. Impact speeds, both before and after the impact, alone are not sufficient. In addition, the stiffness of the combined specimen/ loading fixture also plays an important role in the interpretation of the test results. Strain rate effect on the dynamic ultimate strength (peak load) of spot welds is investigated and the Chao- Wang (CW) Model was developed and validated. The model can be used to predict the dynamic separation load of a spot weld in a structure provided the static fracture load and the loading rate at the spot weld are known. When static fracture load is not known a priori, a simple formula is recommended for estimating the dynamic fracture load for LS, CT, or combined/mixed mode spot welded specimens. Note that all discussions in this work are for spot welds failed by pullout failure mode. The sizes of all welds in the experimental study were intentionally made such that they are larger than the minimum button size required by auto industry. Conditions for guaranteeing a pullout failure are discussed. Dynamic fracture of spot welds with interfacial failure mode obviously warrants further investigation.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Dynamic separation of resistance spot welded joints: Part II - Analysis of test results and a model


    Beteiligte:
    Wang, K. (Autor:in) / Chao, Y.J. (Autor:in) / Zhu, X. (Autor:in) / Miller, K.W. (Autor:in)

    Erschienen in:

    Experimental Mechanics ; 50 , 7 ; 901-913


    Erscheinungsdatum :

    2010


    Format / Umfang :

    13 Seiten, 14 Bilder, 3 Tabellen, 27 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Dynamic separation of resistance spot welded joints: Part I - Experiments

    Chao, Y.J. / Wang, K. / Miller, K.W. et al. | Tema Archiv | 2010


    Dynamic modelling of spot welded joints

    Silva, Julio M.M. / Batista, Fernando C. / Maia, Nuno M.M. | Tema Archiv | 2005



    Self-Piercing Riveted Joints and Resistance Spot Welded Joints in Steel and Aluminium

    Olivier, C. A. / Liebrecht, F. / Booth, G. S. et al. | SAE Technical Papers | 2000


    DOE analysis and factors affecting ultimate strength of multiple resistance spot welded joints

    Zhang,X. / Barkey,M.E. / Lee,Y.L. et al. | Kraftfahrwesen | 2007