Influence of Bauschinger effect and anisotropy on springback of aluminum alloy sheets

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  • Uemori Takeshi
    Department of Advanced Mechanics and Manufacturing Technology, Graduate Schools of Natural Science and Technology, Okayama University
  • Sumikawa Satoshi
    Department of Mechanical Science and Engineering, Hiroshima University
  • Naka Tetsuo
    Automotive Engineering Department, Tokushima College of Technology
  • Ma Ninshu
    Engineering Technology Division, JSOL Corporation
  • Yoshida Fusahito
    Department of Mechanical Science and Engineering, Hiroshima University

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  • アルミニウム合金板のスプリングバックに及ぼすバウシンガ効果と異方性の影響
  • アルミニウム ゴウキンバン ノ スプリングバック ニ オヨボス バウシンガ コウカ ト イホウセイ ノ エイキョウ

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Abstract

For accurate springback calculations, the development of accurate constitutive equation “Yoshida–Uemori model” must always be taken into account. However, several springback calculations of other sheet metals by Yoshida–Uemori model have shown wrong agreements with the corresponding experimental data. The reason is why most of them have been calculated from the view point of the accuracy of Bauschinger effect without the strong anisotropy of sheet metal. In the present paper, we have investigated how the initial anisotropy affects the amount of springback for aluminum sheet metals with Bauschinger effect. Specifically, hat bending experiments in R.D. and T.D. were compared with the corresponding calculations. From the above mentioned comparisons, we found that the optimum combination of an anisotropic yield functions and Yoshida–Uemori model is very important for accurate springback analysis.

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