Numerical Modelling of Damage Evolution in Ingot Forging

Abstract:

The ingot forging process is numerically simulated applying both the Shima-Oyane porous plasticity model as a coupled damage model and the uncoupled normalized Cockcroft & Latham criterion. Four different cases including two different lower die angles (120^o and 180^o) and two different sizes of feed (400mm and 800mm) are analysed. Comparison of the simulation results with recommendations in literature on ingot forging, indicates the normalized Cockcroft & Latham damage criterion to be the most realistic of the two.

• Periodical: Key Engineering Materials (Volumes 651-653)
• Pages: 237-242
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.651-653.237
• Online since: July 2015
• Authors: Peter Christiansen*, Paulo A.F. Martins, Nils Bay, Jesper Hattel
• Keywords: Defects Minimization, Ductile Damage, FEM-Analysis, Ingot Forging, Porous Plasticity

References

[1] S.L. Semiatin: ASM Handbook - Volume 14A, Metalworking: Bulk Forming (ASM 2005).

[2] J. Nasmyth: Improvements in forging iron, J. Franklin Inst. (1850), pp.404-408.

[3] P. Christiansen, J.H. Hattel, N. Bay, P.A.F. Martins: Physical modeling and numerical simulation of V-die forging ingot with central void, J. Mech. Eng. Sci. Vol. 228 (2014), pp.2347-2356.

DOI: 10.1177/0954406213517878

[4] W. Johnson: James Nasmyth (1808-1890): The steam hammer and the mechanics of Vee-anvil forging. J. Mater. Process. Technol. Vol. 32 (1992), pp.1-42.

DOI: 10.1016/0924-0136(92)90161-k

[5] U. Ståhlberg, H. Keife, M. Lundberg and A. Melander: A study of void closure during plastic deformation, J. Mech. Work. Tech. Vol. 4 (1980), pp.51-63.

DOI: 10.1016/0378-3804(80)90005-4

[6] S.P. Dudra and Y.T. Im: Analysis of void closure in open-die forging, Int. J. Mach. Tool Manu., vol. 30, no. 1, pp.65-75, (1990).

[7] P. Christiansen, J.H. Hattel, N. Bay, P.A.F. Martins: Numerical optimization of die geometry in open die forging, Proceedings of International Conference on Advanced Manufacturing Engineering and Technologies Vol. 2 (2013), pp.59-68.

[8] X. Zhang, Z. Cui, W. Chen, Y. Li: A criterion for void closure in large ingots during hot forging, J. Mater. Process. Technol. Vol. 209 (2009), p.1950-(1959).

DOI: 10.1016/j.jmatprotec.2008.04.051

[9] K. Lange: Umformtechnik - Band 2: Massivumformung, Springer Verlag (1988).

[10] I. Tamura, S. Watanabe, K. Watanabe, K. Nakajima: Development of New Processes for Control of Internal Deformation and Internal Stress in Hot Free Forging of Heavy Ingots, Transactaions ISIJ Vol. 24 (1984), pp.101-106.

DOI: 10.2355/isijinternational1966.24.101

[11] S.I. Oh, W.T. Wu, J.J. Park: Application of the finite element method to P/M forming processes, Advanced Technology of Plasticity Vol. 2 (1987), pp.961-968.

DOI: 10.1007/978-3-662-11046-1_37

[12] S.I. Oh, C.C. Chen, S. Kobayashi: Ductile Fracture in Axisymmetric Extrusion and Drawing - Part 2 Workability in Extrusion and Drawing, J. Eng. Ind. Vol. 10 (1979), pp.36-44.

DOI: 10.1115/1.3439471

[13] K. Nahshon, J.W. Hutchinson: Modification of the Gurson Model for shear failure, Eur. J. Mech. A-Solid Vol. 27 (2008), pp.1-17.