Prediction of central bursting during axisymmetric cold extrusion of a metal alloy containing particles

Cahal McVeigh, Wing Kam Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

A simple cell model based damage dependent yield surface is used to model the effect of void nucleation and growth in an aluminum alloy during an axisymmetric cold extrusion process. Material parameters for characterization of the yield surface are determined through a physically consistent micromechanical cell modeling technique. The model can account for the behavior of a void containing a particle under severe compressive processing conditions. The formation of distinct, equally spaced, arrowhead shaped 'central burst' defects is observed during simulation of the extrusion process. Application of the model to a two-stage rolling process is also briefly illustrated. Formation of central bursts during extrusion and edge cracking during rolling is explained in terms of the hydrostatic stress distribution and the related void growth. The affects of material hardening, surface friction and die geometry are examined in the case of extrusion. Correlation is found between the simulations and analytical and experimental results, confirming the suitability of the constitutive model.

Original languageEnglish (US)
Pages (from-to)3087-3105
Number of pages19
JournalInternational Journal of Solids and Structures
Volume43
Issue number10
DOIs
StatePublished - May 2006

Keywords

  • Axisymmetric extrusion
  • Central burst
  • HLC model
  • Void growth

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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