A study on material workability by upsetting of non-axisymmetric specimens by flat dies

S. Alexandrov, M. Vilotic, Yeau-Ren Jeng, M. Plancak

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Upsetting is a typical test for determining the workability diagram. In most cases axisymmetric samples are used for such tests. However, the shape of samples may have a significant effect on the ductile fracture initiation. Therefore, a greater variety of sample geometry should lead to a more accurate shape of the workability diagram. A difficulty here is that a theoretical treatment of samples in which three-dimensional flow occurs is more difficult and time consuming as compared to axisymmetric samples under axisymmetric loading. This difficulty can be overcome in the case of the ductile fracture criterion based on the workability diagram and the average value of the triaxiality factor. In particular, if fracture occurs at free surfaces then it is sufficient to determine experimentally in-surface strains after several stages of the upsetting process, up to the initiation of ductile fracture. After that, the corresponding point of the workability diagram can be found by means of a simple analytical procedure and numerical integration. This approach is used in the present paper to correct the workability diagram using non-axisymmetric upsetting of five different samples made of steel. Some previous results are combined with the new results to obtain the workability diagram over a wide range of the triaxiality factor.

Original languageEnglish
Pages (from-to)585-591
Number of pages7
JournalJournal of Mechanics
Volume30
Issue number6
DOIs
Publication statusPublished - 2014 Mar 13

Fingerprint

upsetting
Ductile fracture
Diagram
Die
diagrams
Ductile Fracture
triaxial stresses
three dimensional flow
Geometry
Steel
Three-dimensional Flow
numerical integration
Free Surface
Numerical integration
steels
Sufficient
geometry
Range of data

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Condensed Matter Physics
  • Applied Mathematics

Cite this

Alexandrov, S. ; Vilotic, M. ; Jeng, Yeau-Ren ; Plancak, M. / A study on material workability by upsetting of non-axisymmetric specimens by flat dies. In: Journal of Mechanics. 2014 ; Vol. 30, No. 6. pp. 585-591.
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A study on material workability by upsetting of non-axisymmetric specimens by flat dies. / Alexandrov, S.; Vilotic, M.; Jeng, Yeau-Ren; Plancak, M.

In: Journal of Mechanics, Vol. 30, No. 6, 13.03.2014, p. 585-591.

Research output: Contribution to journalArticle

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