Anisotropic behavior in plasticity and ductile fracture of an aluminum alloy

Lou, Yanshan and Yoon, Jeong Whan 2015, Anisotropic behavior in plasticity and ductile fracture of an aluminum alloy, Key engineering materials, vol. 651-653, Article preview, pp. 163-168, doi: 10.4028/

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Title Anisotropic behavior in plasticity and ductile fracture of an aluminum alloy
Author(s) Lou, Yanshan
Yoon, Jeong WhanORCID iD for Yoon, Jeong Whan
Journal name Key engineering materials
Volume number 651-653
Season Article preview
Start page 163
End page 168
Total pages 6
Publisher Trans Tech Publications
Place of publication Zurich, Switzerland
Publication date 2015-07
ISSN 1013-9826
Keyword(s) Anisotropy
Ductile Fracture
Fracture Forming Limit Curve
Sheet Metal Forming
Summary Anisotropic mechanical behavior is investigated for an aluminum alloy of 6K21-IH T4 both in plastic deformation and ductile fracture. Anisotropic plastic deformation is characterized by uniaxial tensile tests of dog-bone specimens, while anisotropy in ductile fracture is illustrated with specimens with a central hole, notched specimens and shear specimens. All these specimens are cut off at every 15º from the rolling direction. The r-values and uniaxial tensile yield stresses are measured from the tensile tests of dog-bone specimens. Then the anisotropic plasticity is modeled by a newly proposed J2-J3 criterion under non-associate flow rule (non-AFR). The testing processes of specimens for ductile fracture analysis are simulated to extract the maximum plastic strain at fracture strokes as well as the evolution of the stress triaxiality and the Lode parameter in different testing directions. The measured fracture behavior is described by a shear-controlled ductile fracture criterion proposed by Lou et al. (2014. Modeling of shear ductile fracture considering a changeable cut-off value for stress triaxiality. Int. J. Plasticity 54, 56-80) for different loading directions. It is demonstrated that the anisotropic plastic deformation is described by the J2-J3 criterion with high accuracy in various loading conditions including shear, uniaxial tension and plane strain tension. Moreover, the anisotropy in ductile fracture is not negligible and cannot be modeled by isotropic ductile fracture criteria. Thus, an anisotropic model must be proposed to accurately illustrate the directionality in ductile fracture.
Language eng
DOI 10.4028/
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861199 Basic Metal Products (incl. Smelting
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Trans Tech Publications
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