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J. Manuf. Mater. Process. 2018, 2(1), 3; https://doi.org/10.3390/jmmp2010003

Developing a Zener–Hollomon Based Forming Limit Surface for Warm Sheet Forming of Magnesium Alloy

1
Body Manufacturing Engineering at GM Warren Tech Center, 30001 Van Dyke, Warren, MI 48090, USA
2
Mechanical Engineering, University of Michigan—Dearborn, Dearborn, MI 48128, USA
*
Author to whom correspondence should be addressed.
Received: 3 October 2017 / Revised: 17 December 2017 / Accepted: 26 December 2017 / Published: 11 January 2018
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Abstract

The concept of Zener–Hollomon (Z) based Forming Limit Surface (Z-FLS)—which has minor strain, major strain, and ln(Z) as its three axes—was initially proposed in a previous study. In the Z-FLS diagram, strain rate and temperature effects on the major limit strain are reflected by ln(Z). In the current study, the concept of Z-FLS is revisited to provide a practical approach to construct Z-FLS. A Z-FLS then is constructed for magnesium alloy AZ31B sheet material using available experimental forming limit curves. The constructed Z-FLS is used to identify fracture in a non-isothermal warm cup forming process, which was modeled as a coupled thermo-mechanical process. Based on the Z-FLS, the determined limiting draw ratio (LDR) matches well with the published experimental results. View Full-Text
Keywords: forming limit surface; Zener–Hollomon parameter; warm forming; magnesium alloy forming limit surface; Zener–Hollomon parameter; warm forming; magnesium alloy
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Sheng, Z.Q.; Mallick, P.K. Developing a Zener–Hollomon Based Forming Limit Surface for Warm Sheet Forming of Magnesium Alloy. J. Manuf. Mater. Process. 2018, 2, 3.

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