Finite element investigations of friction condition in equal channel angular extrusion

• Autorzy: Son I. H. , Jin Y. G. , Im Y. T.
• Języki publikacji: EN

Abstrakty

EN

Purpose: This study concentrates on the investigation of contact phenomenon at the interface between dies and the workpiece in terms of material flow and forming load requirement. Design/methodology/approach: The numerical simulations of an equal channel angular extrusion (ECAE) with a CP-Ti Gr-1 cylindrical specimen were carried out by applying the mixed finite element formulation with tetrahedral elements under the non-isothermal condition. Compression test was used for determination of the material data. The change of contact conditions during remeshing was also investigated in terms of variation of load requirements and volume losses after remeshing. In order to validate the numerical algorithm proposed, simulation results were compared with the experimental data. Findings: It was found that the forming load simulated was very sensitive to the contact condition of the workpiece with the channel. The current investigation clearly showed the importance of proper handling of boundary conditions to improve the solution accuracy. Research limitations/implications: Further applications of the proposed scheme are required. Practical implications: The new numerical scheme will be beneficial in better understanding the deformation mechanics of the ECAE. Originality/value: New contact algorithm to solve ECAE was developed to reduce the volume loss and load requirement after remeshing.

Słowa kluczowe

EN

numerical techniques; equal channel angular extrusion; friction condition; remeshing

PL

techniki numeryczne; przeciskanie przez kanał kątowy; warunki tarcia

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 17, nr 1-2
• Strony: 285--288
• Opis fizyczny: Bibliogr. 12 poz., rys., wykr.

Twórcy

autor

Son I. H.

• Computer Aided Materials Processing Laboratory, Department of Mechanical Engineering, ME3227, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea

autor

Jin Y. G.

• Computer Aided Materials Processing Laboratory, Department of Mechanical Engineering, ME3227, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea

autor

Im Y. T.

• Computer Aided Materials Processing Laboratory, Department of Mechanical Engineering, ME3227, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea

Bibliografia

• [1] V.M. Segal, V.I. Rezenikov, A.E. Drobyshevskiy, V.I. Kopylov, Plastic working of metals by simple shear, Metally 1 (1981) 99-105.
• [2] K.N. Braszczynska-Malik and L. Froyen, Equal channel angular pressing of magnesium AZ91 alloy, Proc. of the 8th. Advances in Materials and Processing Technologies, Gliwice-Wisla, Poland, 2005, 86-89.
• [3] P.B. Prangnell, C. Harris and S.M. Roberts, Finite element modelling of equal channel angular extrusion, Scripta Materialia 37 (1997) 983-989.
• [4] D.P. Delo, S.L. Semiatin, Finite-element modeling of non-isothermal equal-channel angular extrusion, Metallurgical and Materials Transactions A30 (1999) 1391-1402.
• [5] M. Furukawa, Z. Horita, H.G. Langdon, Factors influencing the shearing patterns in equal-channel angular pressing, Materials Science and Engineering A332 (2002) 97-109.
• [6] J.H. Lee, I.H. Son, Y.T. Im, Finite element investigation of equal channel angular extrusion process, Materials Transactions, The Japan Institute of Metals 45 (2004) 2165-2171.
• [7] J.R. Bowen, A. Gholinia, S.M. Roberts, P.B. Prangnell, Analysis of the billet deformation behaviour in equal channel angular extrusion, Materials Science and Engineering A287 (2000) 87-99.
• [8] I.H. Son, J.H. Lee, Y.T. Im, Finite element investigation of equal channel angular extrusion with back pressure, Journal of Materials Processing Technology 171 (2006) 480-487.
• [9] S. Kobayashi, S.I. Oh and T. Altan, Metal Forming and the Finite Element Method, Oxford University Press, New York, 1989.
• [10] I.H. Son, Y.T. Im, Localized remeshing technique for three-dimensional metal forming simulations with liner tetrahedral elements, International Journal for Numerical Methods in Engineering, in press, (2006).
• [11] J. K. Park, Design of New Grade Nano-crystalline CP-Ti of 800MPa for Bio-medical Application, Technical report, KOSEF, Korea. (2003).
• [12] W.Y. Choi, I.H. Son, Y.T, Im, Locally refined tetrahedral mesh generation based on advancing front technique with optimization and smoothing scheme, Communications in Numerical Methods in Engineering 20 (2004) 681-688.