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

2018-10-26 10:28:00
LUQIMENG
Original
2558

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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