期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 72, 期 -, 页码 21-43出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2015.05.002
关键词
Ductile fracture; In-plane compression; Kinematic hardening; Reverse loading; Hosford-Coulomb
资金
- MIT Industrial Fracture Consortium
- French National Research Agency [ANR-11-BS09-0008]
- Agence Nationale de la Recherche (ANR) [ANR-11-BS09-0008] Funding Source: Agence Nationale de la Recherche (ANR)
The effect of loading direction reversal on the onset of ductile fracture of DP780 steel sheets is investigated through compression tension experiments on flat notched specimens. A finite strain constitutive model is proposed combining a Swift-Voce isotropic hardening law with two Frederick Armstrong kinematic hardening rules and a Yoshida-Uemori type of hardening stagnation approach. The plasticity model parameters are identified from uniaxial tension-compression stress strain curve measurements and finite element simulations of compression tension experiments on notched specimens. The model predictions are validated through comparison with experimentally-measured load displacement curves up to the onset of fracture, local surface strain measurements and longitudinal thickness profiles. In addition, the model is used to estimate the local strain and stress fields in monotonic fracture experiments covering plane stress states ranging from pure shear to plane strain tension. The extracted loading paths to fracture show a significant increase in ductility as a function of the compressive pre-strain. A Hosford-Coulomb damage indicator model is presented to provide a phenomenological description of the experimental results for monotonic and reverse loading. (C) 2015 Elsevier Ltd. All rights reserved.
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