The Numerical Simulation of Multi-Stage Sheet Metal Forming Based on Modified Yoshida-Uemori Hardening Model

Abstract:

Bauschinger effect is significant for metal forming, particularly for aluminum. A material constitutive model especially for multi-stage sheet metal forming is presented in this paper, which is improved based on Yoshida-Uemori(Y-U) model assumes that there exists different coefficient on equivalent back stress and boundary surface between stages. The prediction of this model is validated through real tension and compression test. Compared to other hardening rules, it can be shown that a more accurate result can be predicted by this model. This model is also successfully applied to be used in the numerical simulation of a multi-stage manufacturing process of an A-pillar, the experimental result demonstrates the advantage of this model in springback analysis in multi-stage simulation over other constitutive model.

• Periodical: Key Engineering Materials (Volume 725)
• Pages: 554-559
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.725.554
• Online since: December 2016
• Authors: Jiang Chen, Wen Liang Chen*
• Keywords: Bauschinger Effect, Isotropic-Kinematic Hardening, Multi-Stage, Sheet Metal Forming

References

[1] S. L. Zang, L. Sum, C. Niu. Measurements of Bauschinger effect and transient behavior of a quenched and partitioned advanced high strength steel[J]. Materials Science & Engineering A, 2013, 586(1): 31-37.

DOI: 10.1016/j.msea.2013.08.003

[2] J. Carbonniere, S. Thuillier, F. Sabourin, M. et al. Comparison of the work hardening of metallic sheets in bending–unbending and simple shear [J]. International Journal of Mechanical Sciences, 2009, 51(2): 122-130.

DOI: 10.1016/j.ijmecsci.2008.12.006

[3] F. Yoshida, T. Uemori, A model of large-strain cyclic plasticity describing the Bauschinger effect and workhardening stagnation. International Journal of Plasticity 18, 661–686, (2002).

DOI: 10.1016/s0749-6419(01)00050-x

[4] P. J. Armstrong, C. O. Frederick. A mathematical representation of the multiaxial Bauschinger effect. CEGB Report RD/B/N731, Berkeley Nuclear Laboratories; (1996).

[5] F. Yoshida, T. Uemori, A model of large-strain cyclic plasticity and its application to springback simulation. International Journal of Mechanical Sciences 45, 1687–1702, (2003).

DOI: 10.1016/j.ijmecsci.2003.10.013

[6] F Barlat, J Lian. Plastic behavior and stretchability of sheet metals. Part I: A yield function for orthotropic sheet under plane stress condition [J]. International Journal of Plasticity, 1989, 5(1): 51-66.

DOI: 10.1016/0749-6419(89)90019-3

[7] T. B. Stoughtona, Ming F. Shi, G. Huang et al. Material Characterization for Benchmark 1 and Benchmark 2[C]. The 10th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Process, Melbourne: AIP, 2014: 9-14.

[8] J. Chen, W. L. Chen, G. K. Du, An approach to predict blank shape for auto-position in multistage sheet metal forming[C]. The 10th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Process, Melbourne: AIP, 2014: 1028-1031.

DOI: 10.1063/1.4850146