Abstract
Warm forming is an attractive formability improvement technique which can be utilized to intensify the usage of aluminum alloy sheets in autobody constructions. In the present work, laboratory-scale stretch forming and deep drawing experiments were performed to demonstrate the comparative formability improvement in AA6082-O and AA5754-H22 aluminum alloy sheets at elevated temperatures. Significant enhancement of limiting dome height and forming limit diagram (FLD) was observed when stretch forming was performed at 200 °C. Warm deep drawing under both isothermal and nonisothermal conditions was carried out, and drastic improvement in drawability was found only under nonisothermal condition with an initial temperature gradient of 93 °C across the blank. Thermomechanical finite element (FE) models of the warm forming processes were developed using temperature-dependent Barlat-89 yield model coupled with Cowper–Symonds strain rate sensitivity model. The limiting dome heights, failure locations and strain distributions were well predicted by implementing experimental FLD as the failure criterion. Further, the effect of evolution of nonisothermal temperature gradient on the improvement in drawability of both the materials was analyzed in terms of cup height, earing profile, thickness distribution and surface strain evolution.
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The authors profoundly acknowledge Mr. K. Sajun Prasad for his valuable help in microstructure analysis.
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Panicker, S.S., Panda, S.K. Investigations into Improvement in Formability of AA5754 and AA6082 Sheets at Elevated Temperatures. J. of Materi Eng and Perform 28, 2967–2982 (2019). https://doi.org/10.1007/s11665-019-04030-1
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DOI: https://doi.org/10.1007/s11665-019-04030-1