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Finite element analysis of plastic deformation in variable lead axisymmetric forward spiral extrusion

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Abstract

A modified axisymmetric forward spiral extrusion (AFSE) has been proposed recently to enhance the strain accumulation during the process. The new technique is called variable lead axisymmetric forward spiral extrusion (VLAFSE) that features a variable lead along the extrusion direction. To assess the effect of design modification on plastic deformation, a comprehensive study has been performed here using a 3D transient finite element (FE) model. The FE results established the shear deformation as the dominant mode of deformation which has been confirmed experimentally. The variable lead die extends strain accumulation in the radial and longitudinal directions over the entire grooved section of the die and eliminates the rigid body rotation which occurs in the case of a constant lead die, AFSE. A comparison of forming loads for VLAFSE and AFSE proved the advantages of the former design in the reduction of the forming load which is more pronounced under higher frictional coefficients. This finding proves that the efficiency of VLAFSE is higher than that of AFSE. Besides, the significant amount of accumulated shear strain in VLAFSE along with non-axisymmetric distribution of friction creates a surface feature in the processed sample called zipper effect that has been investigated.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria, 3800, Australia

    A. Farhoumand & S. Khoddam

  2. Institute for Technology Research and Innovation, Deakin University, Geelong, Victoria, 3216, Australia

    P. D. Hodgson

Authors
  1. A. Farhoumand
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  2. P. D. Hodgson
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  3. S. Khoddam
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Correspondence to S. Khoddam.

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Farhoumand, A., Hodgson, P.D. & Khoddam, S. Finite element analysis of plastic deformation in variable lead axisymmetric forward spiral extrusion. J Mater Sci 48, 2454–2461 (2013). https://doi.org/10.1007/s10853-012-7033-7

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  • DOI: https://doi.org/10.1007/s10853-012-7033-7

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