EVALUATION OF DUCTILE FRACTURE CRITERIA IN A GENERAL THREE-DIMENSIONAL STRESS STATE CONSIDERING THE STRESS TRIAXIALITY AND THE LODE PARAMETER

This paper is concerned with evaluation of various ductile fracture criteria in a general three-dimensional 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 e...

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Bibliographic Details
Published in:Acta mechanica solida Sinica 2013-12, Vol.26 (6), p.642-658
Main Authors: Lou, Yanshan, Huh, Hoon
Format: Article
Language:English
Subjects:
alloys
Classical Mechanics
Criteria
Cut-off
Ductile fracture
ductile material
Engineering
fracture
fracture locus
Fracture mechanics
metal forming
Mohr-Coulomb准则
Strain
Stresses
Surfaces and Interfaces
Theoretical and Applied Mechanics
Thin Films
Three dimensional
Triaxiality
三向应力状态
三维应力状态
三轴
等效塑性应变
股东
评估
韧性断裂准则
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Summary:This paper is concerned with evaluation of various ductile fracture criteria in a general three-dimensional 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. The evaluation demonstrates that the Cockcroft-Latham, Brozzo, Oh, Ko-Huh and the new criteria coupled a reasonable cut-off value for ductile materials.
ISSN:0894-9166
1860-2134
DOI:10.1016/S0894-9166(14)60008-2