Abstract
The AA7075-T6 sheet recently received attention, owing to its low weight and strength for use fabricating automotive parts (e.g., body, motor case). Owing to its low ductility and high strength at room temperature, it is difficult to form; a heating process is required. In this paper we investigate the mechanical properties of a 1.0-mm-thick AA7075-T6 sheet at different temperatures via an uniaxial tensile test, examining the forming characteristics of incremental sheet forming (ISF) at different temperatures. In the ISF experiment, a sheet clamped on a fixed die was heated and maintained at the designed temperature. The forming force was measured by an in situ force monitoring system. The forming parameters included tool diameter, vertical step, temperature, and feed speed. Vertical step and temperature were selected at three levels for experimental design. The formability was evaluated by varying the shapes of wall-angle conical frustums. When the temperature increased to 200 °C, the formability increased dramatically. The fracture-forming limit curve in ISF was defined for this material at different temperatures. This fracture criterion was loaded into ABAQUS software to predict fracture. The comparison between experimental and finite-element method simulation shows good agreement.
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Acknowledgments
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1A6 A3A11030503). In addition, this work was partly supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the republic of Korea (grant No. 20155000000100).
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Xiao Xiao is a Ph.D. student at Kyungpook National University, Republic of Korea. He received his Master degree at Kyungpook National University, Korea in 2017. His research interests are plasticity, sheet metal forming and FEM.
Young-Suk Kim received his M.S. degrees from the Department of Mechanical Engineering at Seoul National University in 1981. He obtained his Ph.D. degree from the Department of Mechanical Engineering at Kobe University in 1986. He is currently a Professor in the Department of Mechanical Engineering at Kyungpook National University. His research interests are production engineering, plasticity, nano / micromechanics, FEM and biomechanics.
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Xiao, X., Kim, CI., Lv, XD. et al. Formability and forming force in incremental sheet forming of AA7075-T6 at different temperatures. J Mech Sci Technol 33, 3795–3802 (2019). https://doi.org/10.1007/s12206-019-0722-2
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DOI: https://doi.org/10.1007/s12206-019-0722-2