Simulation of Hot Sheet Metal Forming Processes Based on a Micro-Structural Constitutive Model

Abstract:

A constitutive model is proposed for simulations of hot forming processes. Dominant mechanisms in hot forming including inter-granular deformation, grain boundary sliding and grain boundary diffusion are considered in the constitutive model. A Taylor type polycrystalline model is used to predict inter-granular deformation. Previous works on grain boundary sliding and grain boundary diffusion are extended to drive three dimensional macro stress-strain rate relationships for each mechanism. In these relationships, the effect of grain size is also taken into account. It is shown that for grain boundary diffusion, stress-strain rate relationship obeys the Prandtl-Reuss flow rule. The proposed model is used to simulate step strain rate tests and the results are compared with experimental data. It is concluded that the model can be used to predict flow stress for various grain sizes and strain rates. The proposed model can be directly used in simulation of hot forming processes and as an example the bulge forming process is simulated and the results are compared with experimental data.

• Periodical: Key Engineering Materials (Volume 473)
• Pages: 556-563
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.473.556
• Online since: March 2011
• Authors: Mahmoud Farzin, Reza Jafari Nedoushan, Mohammad Mashayekhi
• Keywords: Hot-Forming, Micro-Structural Constitutive Model, Quick-Plastic Forming, Sheet Metal Forming, Super Plastic Forming (SPF)

References

[1] A.J. Barnes: Journal of Materials Engineering and Performance, Vol. 16 (2007), p.440.

[2] H.L. Xing, C.W. Wang, K.F. Zhang and Z.R. Wang: Journal of Materials Processing Technology, Vol. 151 (2004), p.196.

[3] N. Chandra: International Journal of Non-Linear Mechanics, Vol. 37 (2002), p.461.

[4] S. Agarwal, C. Briant, P. Krajewski, A. Bower and E. Taleff: Journal of Materials Engineering and Performance, Vol. 16 (2007), p.170.

[5] A.F. Bower and E. Wininger: Journal of the Mechanics and Physics of Solids, Vol. 52 (2004), p.1289.

[6] D.E. Cipoletti, A.F. Bower, Y. Qi and P.E. Krajewski: Materials Science and Engineering: A, Vol. 504 (2009), p.175.

[7] N. Du, A.F. Bower, P.E. Krajewski and E.M. Taleff: Materials Science and Engineering: A, Vol. 494 (2008), p.86.

[8] P.E. Krajewski, L.G. Hector Jr, N. Du and A.F. Bower: Acta Materialia, Vol. 58 (2010), p.1074.

[9] J.H. Kim, S.L. Semiatin and C.S. Lee: Acta Materialia, Vol. 51 (2003), p.5613.

[10] T.G. Langdon: Acta Metallurgica et Materialia, Vol. 42 (1994), p.2437.

[11] F.C. Liu and Z.Y. Ma: Scripta Materialia, Vol. 62 (2010), p.125.

[12] S.S. Park, H. Garmestani, G.T. Bae, N.J. Kim, P.E. Krajewski, S. Kim and E.W. Lee: Materials Science and Engineering: A, Vol. 435-436 (2006), p.687.

DOI: 10.1016/j.msea.2006.07.103

[13] M. -A. Kulas, W.P. Green, E.M. Taleff, P.E. Krajewski and T.R. Mcnelley: Metallurgical and Materials Transactions A, Vol. 36A (2005), p.1249.

DOI: 10.1007/s11661-005-0217-x

[14] W. Green, M. -A. Kulas, A. Niazi, E. Taleff, K. Oishi, P. Krajewski and T. McNelley: Metallurgical and Materials Transactions A, Vol. 37 (2006), p.2727.

DOI: 10.1007/bf02586106

[15] T.R. McNelley, K. Oh-Ishi, A.P. Zhilyaev, S. Swaminathan, P.E. Krajewski and E.M. Taleff: Metallurgical and Materials Transactions A, Vol. 39 (2008), p.50.

DOI: 10.1007/s11661-007-9401-5

[16] K. Inal, K.W. Neale and A. Aboutajeddine: International Journal of Plasticity, Vol. 21 (2005), p.1255.

[17] K. Inal, P.D. Wu and K.W. Neale: International Journal of Plasticity, Vol. 16 (2000), p.635.

[18] A.C.F. Cocks: Mechanics of Materials, Vol. 13 (1992), p.165.

[19] J. Pan and A.C.F. Cocks: Computational Materials Science, Vol. 1 (1993), p.95.

[20] D. Peirce, R.J. Asaro and A. Needleman: Acta Metallurgica, Vol. 30 (1982), p.1087.

[21] D. Peirce, R.J. Asaro and A. Needleman: Acta Metallurgica, Vol. 31 (1983), p. (1951).

[22] R.J. Asaro: J Appl Mech, Vol. 50 (1983), p.921.

[23] Y. Huang. A user material subroutine incorporating single crystal plasticity in the ABAQUS finite element program. Massachusetts: Harvard University, (1992).

[24] G.I. Taylor: Journal of the Institute of Metals, Vol. 62 (1938), p.307.

[25] M.T. Eric, G.H. Louis, R.B. John, V. Ravi and E.K. Paul, Vol. 57 (2009), p.2812.