Extrusion of non-symmetric T-shaped sections, an analysis and some experiments

N. R. Chitkara, Kemal Celik

Research output: Contribution to journalArticlepeer-review


In the present study, previously developed analytical approach (Int. J. Mech. Sci. 42 (2000) 273), based on the upper-bound theory, for the design of three-dimensional off-centric extrusion of arbitrarily shaped dies was applied to the extrusion of T-shaped sections from initially round billets with the experimental verifications. Here, non-symmetric T-shaped sections as well as symmetric ones were considered. A computer program was written to obtain optimum die design which yield the lowest upper-bound for a given reduction in area, die length, its off-centric positioning and the frictional conditions. Computations were carried out both for the converging (ruled-surface) and the smooth curved (advanced-surface) dies. Curvature of the extruded product and simulated deforming grid pattern were also predicted. A sophisticated CAD/CAM package was used in conjunction with the CNC and EDM processes to manufacture the streamlined dies for the extrusion of T-shaped sections. The theoretical predictions were observed to be in good agreement with the experimental results.

Original languageEnglish (US)
Pages (from-to)2961-2987
Number of pages27
JournalInternational Journal of Mechanical Sciences
Issue number12
StatePublished - Dec 2001
Externally publishedYes


  • Analysis
  • Experiments
  • Non-symmetric T-shaped section
  • Three-dimensional off-centric extrusion

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Aerospace Engineering
  • Ocean Engineering
  • Applied Mathematics
  • General Materials Science
  • Civil and Structural Engineering


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