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Aluminum Sheet

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Fusahito Yoshida – 1st expert on this subject based on the ideXlab platform

  • Observations of Cyclic Deformation Behaviors of Aluminum Sheet and Constitutive Modeling
    Procedia Engineering, 2014
    Co-Authors: Takeshi Uemori, Satoshi Sumikawa, Tetsuo Naka, Fusahito Yoshida

    Abstract:

    Abstract Aluminum Sheet metals have been widely utilized for a light weight construction of automobile. However, these metals still remain one of the difficult materials to predict the accurate final shapes after press forming processes, because of several mechanical features such as plastic anisotropy of yield stress and small Lankford value. In order to solve the problems, the present author has developed a new constitutive model. The model can describe accurate non-proportional hardening behaviors of Aluminum Sheet metals. In the present research, some experimental procedures were carried out to reveal the mechanical properties of an Aluminum Sheet under proportional and non-proportional deformations. The comparisons between experimental data and the corresponding calculated results by the proposed constitutive model confirm the advantages of our model.

  • air bending and springback of stainless steel clad Aluminum Sheet
    Journal of Materials Processing Technology, 2010
    Co-Authors: K Yilamu, Ryutaro Hino, Hiroshi Hamasaki, Fusahito Yoshida

    Abstract:

    Abstract This paper deals with bending and springback phenomena of a stainless-steel clad Aluminum Sheet in V-shaped air bending. The aim of this study is to investigate the bending characteristics such as Sheet thickness change and the bending angles of the Sheet before/after springback. The first part of this paper is on the experimental observations. V-bending experiments were performed for both the cases of Al in /SS out (i.e., Aluminum layer is located inside the bent clad) and SS in /Al out (i.e., stainless-steel layer is located inside the bent clad). From these results, it was found that the Sheet-set condition (either Al in /SS out or SS in /Al out ) has a great influence on the bending phenomena. In the second part, the accurate prediction of springback by FE analysis, especially the role of elasto-plasticity models, is discussed. When using Yoshida–Uemori kinematic hardening model (F. Yoshida, T. Uemori, Int. J. Plasticity 18, 2002; Int. J. Mech. Sci., 45, 2003), which well describes the Bauschinger effect of materials, the springback of the clad Sheet is accurately calculated, whereas the classical isotropic hardening model underestimates the springback.

K Yilamu – 2nd expert on this subject based on the ideXlab platform

  • air bending and springback of stainless steel clad Aluminum Sheet
    Journal of Materials Processing Technology, 2010
    Co-Authors: K Yilamu, Ryutaro Hino, Hiroshi Hamasaki, Fusahito Yoshida

    Abstract:

    Abstract This paper deals with bending and springback phenomena of a stainless-steel clad Aluminum Sheet in V-shaped air bending. The aim of this study is to investigate the bending characteristics such as Sheet thickness change and the bending angles of the Sheet before/after springback. The first part of this paper is on the experimental observations. V-bending experiments were performed for both the cases of Al in /SS out (i.e., Aluminum layer is located inside the bent clad) and SS in /Al out (i.e., stainless-steel layer is located inside the bent clad). From these results, it was found that the Sheet-set condition (either Al in /SS out or SS in /Al out ) has a great influence on the bending phenomena. In the second part, the accurate prediction of springback by FE analysis, especially the role of elasto-plasticity models, is discussed. When using Yoshida–Uemori kinematic hardening model (F. Yoshida, T. Uemori, Int. J. Plasticity 18, 2002; Int. J. Mech. Sci., 45, 2003), which well describes the Bauschinger effect of materials, the springback of the clad Sheet is accurately calculated, whereas the classical isotropic hardening model underestimates the springback.

Amit K. Ghosh – 3rd expert on this subject based on the ideXlab platform

  • Biaxial warm forming behavior of Aluminum Sheet alloys
    Journal of Materials Processing Technology, 2004
    Co-Authors: Daoming Li, Amit K. Ghosh

    Abstract:

    In the present investigation, biaxial warm forming behavior in the temperature range 200-350°C is investigated for three automotive Aluminum Sheet alloys: Al 5754, Al 5182 containing 1% Mn (Al 5182+Mn) and Al 6111-T4. While the formability for all the three alloys improves at elevated temperatures, the strain hardened alloys Al 5754 and Al 5182+Mn show considerably greater improvement than the precipitation hardened alloy Al 6111-T4. Even without the precipitation treatment, the formability of alloy 6111 could not be improved. Formability was studied by forming rectangular parts at a rapid rate (dε/dt ∼1s-1) using internally heated punch and die in both isothermal and non-isothermal conditions. Temperature effect on drawing of the Sheet was found to have a large effect on formability. Setting die temperature slightly higher than punch temperature was favorable in promoting formability. Forming limit diagram (FLD) under warm forming conditions was also determined, which showed results that are consistent with the evaluation of part depth. It is confirmed by post-forming tensile test results that rapid warm forming in the above-mentioned temperature range does not create a significant loss in yield strength. After a simulated paint-baking treatment (177°C for 30min) the Sheet retains strength level in the part similar to current stamped parts. © 2003 Elsevier B.V. All rights reserved.

  • biaxial warm forming behavior of Aluminum Sheet alloys
    Journal of Materials Processing Technology, 2003
    Co-Authors: Daoming Li, Amit K. Ghosh

    Abstract:

    Abstract In the present investigation, biaxial warm forming behavior in the temperature range 200–350 °C is investigated for three automotive Aluminum Sheet alloys: Al 5754, Al 5182 containing 1% Mn (Al 5182+Mn) and Al 6111-T4. While the formability for all the three alloys improves at elevated temperatures, the strain hardened alloys Al 5754 and Al 5182+Mn show considerably greater improvement than the precipitation hardened alloy Al 6111-T4. Even without the precipitation treatment, the formability of alloy 6111 could not be improved. Formability was studied by forming rectangular parts at a rapid rate ( d e/ d t∼1 s −1 ) using internally heated punch and die in both isothermal and non-isothermal conditions. Temperature effect on drawing of the Sheet was found to have a large effect on formability. Setting die temperature slightly higher than punch temperature was favorable in promoting formability. Forming limit diagram (FLD) under warm forming conditions was also determined, which showed results that are consistent with the evaluation of part depth. It is confirmed by post-forming tensile test results that rapid warm forming in the above-mentioned temperature range does not create a significant loss in yield strength. After a simulated paint-baking treatment (177 °C for 30 min) the Sheet retains strength level in the part similar to current stamped parts.