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

          2018-10-26 10:28:00
          LUQIMENG
          Original
          2214

          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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