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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2006

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Finite element investigations of friction condition in equal channel angular extrusion

100%

Son I. H. , Jin Y. G. , Im Y. T.

tom Vol. 17, nr 1-2

285--288

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.