期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 69-70, 期 -, 页码 459-474出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2015.05.006
关键词
Ductile fracture; Stress triaxiality; Lode angle; Non-proportional loading; Tension-torsion
类别
资金
- Jessica Papasidero through a Monge Fellowship from Ecole Polytechnique
- Region Ile-de-France
- 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 stress state and loading path on the ductile fracture of aluminum 2024-T351 is characterized through tension-torsion experiments on tubular specimens. The experimental program includes proportional and non-proportional loading paths leading to the onset of fracture at nearly plane stress conditions at stress triaxialities between 0 and 0.6. Stereo digital image correlation is used to measure the displacements and rotations applied to the specimen shoulders. An isotropic non-quadratic Hosford plasticity model with combined Voce-Swift hardening is used to obtain estimates of the local stress and strain fields within the specimen gage section. The hybrid experimental-numerical results indicate a higher strain to fracture for pure shear than for uniaxial tension. The calibration of a Hosford-Coulomb fracture initiation model suggests that the ductility of aluminum 2024-T351 decreases monotonically as a function of the stress triaxiality, whereas it is a non-symmetric convex function of the Lode angle parameter. It is shown that a simple non-linear damage accumulation rule can describe the effect of non-proportional loading on the strain to fracture. (C) 2015 Elsevier Ltd. All rights reserved.
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