极限抗拉强度
成形性
成形工艺
可塑性
拉伸试验
微观结构
变形(气象学)
镁合金
挤压
金属薄板
缩颈
铝
冶金
应变率
铝合金
作者
Yubao Wang,Cunsheng Zhang,Yinghao Wang,Guoqun Zhao,Liang Chen
标识
DOI:10.1007/s11665-021-05981-0
摘要
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–Kuczynski) 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.
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