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The flow behavior and forming limit modeling of an Al-Cu-Mg aluminum alloy sheet considering the effects of pre-strain and solution heat treatment

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Abstract

Al-Cu-Mg aluminum alloy sheet is widely used for aircraft skin. Multi-stage forming combined with Solution Heat Treatment (SHT) is necessary for some geometrically complex productions in aircraft skin components. However, the effects of pre-strain and natural ageing time on the formability of Al-Cu-Mg aluminum alloy sheet are not fully understood. In this study, the deformation responses of an Al-Cu-Mg aluminum alloy sheet, over a range of pre-strain levels (0% to 6%) and natural ageing time levels (0 h to 2 h) were investigated. A modified Hollomon constitutive model coupling with pre-strain and natural ageing time was proposed to characterize the deformation responses of the Al-Cu-Mg aluminum alloy sheet. The hemispherical dome tests were performed at natural ageing time levels ranging from 0.25 h to 1.5 h. Marciniak and Kuczynski (M-K) theory was used to obtain the forming limit prediction model which takes pre-strain and natural ageing time into account. The theoretical Forming Limit Curves (FLCs) were compared with the experimental results.

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China

    Xiao-Qiang Li, Gui-Qiang Guo, Nan Song & Dong-Sheng Li

  2. Guodian United Power Technology Company ltd., Building 1, Yard 16 West 4th Ring Road, Haidian District, Beijing, 100039, China

    Hong-Zhi Gao

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Correspondence to Xiao-Qiang Li.

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Li, XQ., Guo, GQ., Gao, HZ. et al. The flow behavior and forming limit modeling of an Al-Cu-Mg aluminum alloy sheet considering the effects of pre-strain and solution heat treatment. Int. J. Precis. Eng. Manuf. 16, 971–979 (2015). https://doi.org/10.1007/s12541-015-0126-x

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  • DOI: https://doi.org/10.1007/s12541-015-0126-x

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