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        Predicting ductile failure of advanced high strength steel with shell element models

        2018-10-26 10:28:00
        LUQIMENG
        Original
        2483

        Focus on simplicity and robustness of experimental technique:

        ? All experiments can be performed in a uniaxial testing machine
        ? Strains to fracture can be directly measured on specimen surface (no FEA needed)








        ? Localized necking criterion for arbitrary loading conditions e.g. combination of bending and membrane loading

        ? What if localized necking does not occur?


        ? Three point bending of hot stamped martensitic hat section



        ? Developed HC ductile fracture model accounting for (a) stress state, (b) strain rate, (c) anisotropy, and (d) loading history


        ? Basic version of HC model requires results from three calibration experiments only


        ? All calibration experiments can be performed in a uniaxial testing frame and fracture strain is directly measured using digital image correlation


        ? Presented SHPB technique for oscillation-free measurements at intermediate and high strain rates


        ? By combining the Domain of Shell-to-Solid Equivalence and HC model, ductile failure is conveniently predicted with shell finite elements




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