Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 30, Issue 11, Pages 8224-8234Publisher
SPRINGER
DOI: 10.1007/s11665-021-05981-0
Keywords
Al-Mg-Li alloy sheet; anisotropy; forming limits curves (FLCs); yield criterion
Categories
Funding
- National Natural Science Foundation of China [51975330, 51735008]
- Key Research and Development Program of Shandong Province [2019JZZY010360]
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Anisotropic properties of the Al-Mg-Li alloy sheet were systematically studied using uniaxial and cruciform biaxial tension tests. The Yld2000-2d yield function provided a better description of the yield locus, and the modified M-K model successfully predicted the forming limits of the sheet. Results showed good agreement with experimental data.
For the Al-Mg-Li alloy sheet with significant anisotropy, the uniaxial and cruciform biaxial tension tests and the Nakazima test are firstly performed to systematically determine the mechanical properties (including strength coefficient, strain hardening exponent, normal anisotropy coefficient, experimental yielding points and forming limits) of this sheet. Afterward, the widely used Hill's 48 and Yld2000-2d yield criteria are, respectively, identified to describe the yield locus of this sheet and compared with the experimental yielding points. Comparison shows that the identified Yld2000-2d yield function provides a better description of the yield locus for the Al-Mg-Li alloy sheet. Finally, the forming limits of this sheet are predicted by the modified M-K (Marciniak-Kuczyfiski) model with the Yld2000-2d yield criterion identified in this work. The results show that the predicted forming limits correspond well with the experimental ones within the whole range of strain paths. [GRAPHICS] .
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