Paper Title:
The Influence of ECAP Die Channel Geometry on Shear Strain and Deformation Uniformity
  Abstract

The present work was performed in order to analyze the influence of the outer corner radius (R) of ECAP die channels on the strain field of billets subjected to ECAP deformation in a Φ = 120o die, employing three different methods: (i) physical simulation, consisting of the direct measurement of deformations of a grid inscribed in longitudinally cut mid-planes of ECAPed billets; (ii) numerical simulation employing an explicit finite element code for large displacements and large plastic deformations, and (iii) calculation by the Iwahashi formula. Materials employed were Al-4%Cu and an eutectic Pb-62Sn alloy, and the dependence of shear strain with R was satisfactorily described using the three methods. The experimental method showed a small deviation from the other two, which was explained making use of the corner die formation concept. Similarly, this concept helped to understand the increase of strain heterogeneity with R. Also, it was shown that large corner radii decrease ECAP pressing loads, facilitating deformation of high strength materials. Finally, the data show that the deformation characteristics of the materials here studied do not exert a measurable influence on the shear strain magnitude and distribution.

  Info
Periodical
Materials Science Forum (Volumes 584-586)
Edited by
Yuri Estrin and Hans Jürgen Maier
Pages
145-150
DOI
10.4028/www.scientific.net/MSF.584-586.145
Citation
A.A. de A. Mendes Filho, V. L. Sordi, J. B. Rubert, M. Ferrante, "The Influence of ECAP Die Channel Geometry on Shear Strain and Deformation Uniformity", Materials Science Forum, Vols. 584-586, pp. 145-150, 2008
Online since
June 2008
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