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Simões, Vasco
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document
Natural aging effect on the forming behavior of a cylindrical cup with an Al-Mg-Si alloy
Abstract
Natural Aging of EN AW 6016-T4 is experimentally evaluated under uniaxial tensile test and forming of a cylindrical cup. The uniaxial tensile tests were performed 4 days, 1, 4, 7 and, 18 months after the alloy quenching. The results shows an increase of the proof and tensile strengths, while the in-plane anisotropy remains globally invariable with the increase of the storage time. The forming of cylindrical cups was performed too, with specimens at 1 and 18 months of natural aging. The increase of the proof and tensile strengths leads to an increase of the punch force during the deep drawing process. However, the effect on the thickness evolution along the cup's wall and on the cup's height is negligible. In fact, the numerical simulation results indicate that these parameters are more sensitive to the initial sheet thickness (considering the mean value of 1.047mm or the approximated one of 1.000mm) than to the changes induced by aging in the hardening behavior.