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루얀산(Yanshan Lou),박명준(Mingjun Piao),허훈(Hoon Huh) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
This paper is concerned with evaluation of various ductile fracture criteria in a general three dimensional (3D) stress state of stress triaxiality, the Lode parameter and the equivalent plastic strain to fracture. Evaluation is carried out by comparing fracture loci constructed by fracture criteria to experimental results of Al2024- T351. Comparison demonstrates that the Modified Mohr-Coulomb criterion and a newly proposed criterion provide sufficient predictability of fracture strain. Moreover, evaluation is emphasized on the predicted cut-off value for stress triaxiality. Evaluation suggests that the Cockcroft-Latham, Brozzo, Oh, KoHuh and the new criteria coupled a reasonable cut-off value for ductile materials.