The r-value is a very important parameter in the forming simulations of high strength steels, especially for steels with prominent anisotropy. R-values for sheet steels conventionally measured by extensometers were found neither consistent nor accurate due to difficulties in measuring the width strain. In this study, the Digital Image Correlation (DIC) technique was applied to determine r-values in Longitudinal (L), Transverse (T) and Diagonal (D) directions for cold rolled DP980 GI, DP780 GI, DP600 GI and BH250 GI sheet steels. The r-values measured from DIC were validated by finite element analysis (FEA) of a uniaxial tensile test for BH250. The simulation results of the load-displacement for two plasticity models were compared to experimental data, with one being the isotropic yield (von-Mises) and the other being an anisotropic model (Hill-48) using the r-value measured from DIC. The comparison showed that the simulation using anisotropic model yielded much better accuracy than isotropic model. It served as a strong indication of the advantages of using DIC to generate accurate r-values along different orientations for simulating the deformation behavior of anisotropic steels.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Measurement of r-values of High Strength Steels Using Digital Image Correlation


    Weitere Titelangaben:

    Sae Int. J. Mater. Manuf
    Sae International Journal of Materials and Manufacturing


    Beteiligte:
    Yan, Benda (Autor:in) / Huang, Gang (Autor:in) / Xia, Z. (Autor:in)

    Kongress:

    SAE 2011 World Congress & Exhibition ; 2011



    Erscheinungsdatum :

    12.04.2011


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Measurement of r-values of high strength steels using digital image correlation

    Huang,G. / Yan,B. / Xia,Z. et al. | Kraftfahrwesen | 2011


    Measurement of r-values of High Strength Steels Using Digital Image Correlation

    Huang, G. / Yan, B. / Xia, Z. et al. | British Library Conference Proceedings | 2011