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|저자명||Yanshan Lou Hoon Huh Gihyun Bae Seokbong Kim Younki Ko|
This paper proposes a new ductile fracture criterion for finite element analysis (FEA) to predict limit dome height (LDH) in punch-stretch tests. The new ductile fracture criterion is suggested for the accurate prediction of a forming limit diagram (FLD) of sheet metals, which is characterized by two material constants. To implement the new criterion into FEA, a user subroutine for ABAQUS/Explicit was developed with the Yld89 yield function. Finite element (FE) models were constructed for the simulation of punch-stretch tests. Punch-stretch tests are simulated to predict the fracture initiation by the new criterion for SPCC. LDHs are measured when fracture initiates in simulations. Fracture location and LDHs are also estimated by simulation with other ductile fracture criteria such as the Cockcroft-Latham, Brozzo, Oh, Oyane-Sato, Clift and Ko-Huh criteria for comparison with experimental results. The comparison demonstrates that LDHs predicted by all criteria match with the experimental results for arc-shaped specimens while the new criterion predicts more accurate LDHs than other ductile fracture criteria for square-shaped specimens.