FEM Simulation of Anisotropic Parameters Influencing the Earing in Sheet Metal Deep Drawing Process

Abstract:

Earing is often undesirable in the production of deep drawn containers because it results in a nonuniform cup height. A finite element model for earring analysis is developed considering only the flange area of the sheet. It was found that the draw-in depth of the flange increases with the increase of the r value, and it remains invariable when r value is larger than 2. With the increase of the r value, the max thickness decreases and the min thickness increases. If △r>0, four earings are formed. If △r =0, the material characteristics in all the planar directions are same. The flange uniformly flows into the die cavity, no earing is formed. If △r<0, four earings are formed. The earing distribution is dominated by r₀, r₄₅ and r₉₀. Both r and △r have much effect on the earing distribution.

• Periodical: Applied Mechanics and Materials (Volumes 88-89)
• Pages: 638-641
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.88-89.638
• Online since: August 2011
• Authors: Lei Chen
• Keywords: Earing, Finite Element Method (FEM), Sheet Metal Forming

References

[1] K.C. Chan: Scripta Metall. Mater. Vol. 32 (1995), p.229.

[2] Y. Zhou, J.J. Jonas and J. Savoie: Int. J. Plasticity Vol. 14 (1998), p.117.

[3] K. Inala, P.D. Wub and K.W. Neale: Int. J. Plasticity Vol. 16 (2000), p.635.

[4] Z. Zhao, W. Mao and F. Roters: Acta Materialia Vol. 52 (2004), p.1003.

[5] J.W. Yoon, D.Y. Yang and K. Chung: Int. J. Plasticity Vol. 15(1999), p.35.

[6] R. Hill: The Mathematical Theory of Plasticity (Oxford University Press, Oxford 1950).

[7] M. Gotoh: Int. J. Mech. Sci. Vol. 19 (1977), p.505.

[8] F. Barlat, J. Lian: Int. J. Plasticity Vol. 5 (1989), p.51.

[9] C. Miehe, J. Schotte: Comput. Methods Appl. Mech. Engrg. Vol. 193 (2004), p.25.

[10] E. Nakamachi, C.L. Xie: Int. J. Mech. Sci. Vol. 43 (2001), p.631.