Investigation of the Rolling Direction Influence on Springback Effect of a U-Shaped Made from AZ31 Magnesium Alloy

Abstract:

Magnesium alloys were being increasingly considered for sheet forming applications because of their low density and high strength. Therefore, the main areas of research focused on the deformation mechanisms, improving ductility, and possible forming applications [1]. Published results on deformability and springback prediction of magnesium alloy stripes are minimal. The rolling direction of the materials with respect to the deformation direction can greatly influence on springback as well as formability. Though novel approaches relating to the formality of magnesium alloy stripes are available, the change of springback due to the characteristic of each process should be verified by finite element method [2]. In this study, the magnesium alloy strips having the thickness of 1mm, are used to investigate springback characteristics in U-shape bending. The Dynaform 5.8 software was used to simulate the forming process, in which the rolling directions of the material vary with respect to the main deformation axis. There are three different cases: RD0^o, RD45^o and RD90^o. The springback phenomenon is simulated using the same software, but a different module. The following aspects stand out from the simulation tests of the influence of rolling direction on springback parameters: the material rolling direction perpendicular to the deformation direction (0^o) leads to reduction of springback intensity; the thickness of the material in case of RD0^o is reduced in comparison with the one of RD90^o. It can be considered that the results generated by the analysis of springback phenomenon using finite element method are sufficiently accurate and can be considered valid.

• Periodical: Applied Mechanics and Materials (Volumes 809-810)
• Pages: 283-288
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.809-810.283
• Online since: November 2015
• Authors: Aurelian Albut*
• Keywords: Forming, Magnesium Alloy, Rolling Direction, Springback

References

[1] R. H. Wagoner, H. Lim, M. G. Lee, Advanced Issues in springback, International Journal of Plasticity. 45 (2013) 3-20.

[2] F. Pourboghrat, E. Chu, Prediction of spring-back and side-wall curl in 2-D draw bending, J. of Mat. Proc. Tech. 50, 1-4 (1995) 361-374.

DOI: 10.1016/0924-0136(94)01398-k

[3] N. Yamamura et al., Springback simulation by the static explicit FEM code, using a new algorithm for canceling the non-equilibrated forces, Simulations of Materials Processing: Theory, Methods and Applications, Swets & Zeitlinger, Lisse, (2001).

[5] F. Pourboghrat, E. Chu, Springback in plane strain stretch/draw sheet forming, Int. J. Mech. Sci. 36, 3 (1995) 327-341.

DOI: 10.1016/0020-7403(95)93523-9

[6] J.K. Lee, B.K. Chun, H.Y. Kim, Numerical investigation of tailor welded blanks forming and springback, in the proceedings of the 7th international conferenceon numerical methods in industrial forming processes, Numiform, Toyohashi, Japan, 2001, pp.729-734.

DOI: 10.22215/etd/1999-04345

[7] G. Liu, Z. Lin, W. Xu, Y. Bao, Variable blankholder force in u-shaped part forming for eliminating springback error, J. of Mat. Proc. Tech. 120, 1-3 (2002) 259-264.

DOI: 10.1016/s0924-0136(01)01110-4

[8] M. Samuel, Experimental and numerical prediction of springback and side wall in u-bending of anisotropic sheet metals, J. of Mat. Proc. Tech. 105 (2000) 382-393.

DOI: 10.1016/s0924-0136(00)00587-2

[9] B. Chirita, G. Brabie, Experimental analysis of different influences on springback of parts formed by U-bending, in the proceedings of the 7th International Research/Expert Conference Trends in the Development of Machinery and Asociated Technology, Barcelona, Spain, 2003, pp.141-144.

[10] B. Chirita, Factors of influence on the springback of formed metal sheets, ESAFORM The 5th International Conference on Material Forming, Krakow, Poland, (2002).