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

Farhoumand, A., Hodgson, P.D. and Khoddam, S. 2013, Finite element analysis of plastic deformation in variable lead axisymmetric forward spiral extrusion, Journal of materials science, vol. 48, no. 6, pp. 2454-2461, doi: 10.1007/s10853-012-7033-7.

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Title Finite element analysis of plastic deformation in variable lead axisymmetric forward spiral extrusion
Author(s) Farhoumand, A.
Hodgson, P.D.
Khoddam, S.
Journal name Journal of materials science
Volume number 48
Issue number 6
Start page 2454
End page 2461
Total pages 8
Publisher Springer
Place of publication Berlin, Germany
Publication date 2013-03
ISSN 0022-2461
Summary 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. © 2012 Springer Science+Business Media New York.
Language eng
DOI 10.1007/s10853-012-7033-7
Field of Research 109999 Technology not elsewhere classified
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category C1 Refereed article in a scholarly journal
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Document type: Journal Article
Collections: Institute for Frontier Materials
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