A sigmoidal model for superplastic deformation

W. Pan, K. Krohn, S.B. Leen, T.H. Hyde, S. Walloe

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A new phenomenological model, designed to capture the sigmoidal nature of stress dependency on strain rate for superplastic deformation, is presented. The model is developed for the Ti-6Al-2Sn-4Zr-2Mo alloy using data obtained under controlled strain-rate tensile tests spanning a range of strain rates and temperatures, from 930 to 980 °C. The sigmoidal model performance is compared with that of a more conventional double-power law, strain, and strain-rate hardening model using time-dependent finite element and theoretical analyses. The primary intended application of the sigmoidal model is for more accurate simulation of the effects of strain-rate variation within test specimens and sheet during superplastic deformation. Analysis of this variation within two designs of tensile test specimens is presented to illustrate this aspect.
LanguageEnglish
Pages149-162
Number of pages13
JournalProceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
Volume219
Issue number3
DOIs
Publication statusPublished - 2005

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Superplastic deformation
Strain rate
Hardening

Keywords

  • superplastic deformation
  • sigmoidal model
  • materials design

Cite this

Pan, W. ; Krohn, K. ; Leen, S.B. ; Hyde, T.H. ; Walloe, S. / A sigmoidal model for superplastic deformation. In: Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications . 2005 ; Vol. 219, No. 3. pp. 149-162.
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A sigmoidal model for superplastic deformation. / Pan, W.; Krohn, K.; Leen, S.B.; Hyde, T.H.; Walloe, S.

In: Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications , Vol. 219, No. 3, 2005, p. 149-162.

Research output: Contribution to journalArticle

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AU - Leen, S.B.

AU - Hyde, T.H.

AU - Walloe, S.

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