Multi-scale analysis of failure during superplastic deformation

N. V. Thuramalla, P. V. Deshmukh, Marwan Khraisheh

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Failure during superplastic deformation (SPD) may result from geometrical macroscopic instabilities and/or microstructural aspects. However, the available failure criteria are based either on geometrical instabilities or microstructural features and do not account for both failure modes. In this work, a new multiscale stability criterion is developed by combining a modified microstructure-based constitutive equation with grain and cavitation evolution equations. The new criterion is used to design optimum variable strain rate forming paths for Ti-6Al-4V SP alloy. The effects of void fraction, grain size and strain rate sensitivity on the optimum forming paths are also examined. In addition, FE analysis of superplastic blow forming of a hemisphere is carried out using the optimum forming path and the results are compared with those obtained using constant strain rate forming paths. It is shown that the proposed multi-scale criterion can reduce the forming time without causing localized deformation and thinning.

Original languageEnglish
Pages (from-to)105-110
Number of pages6
JournalMaterials Science Forum
Volume447-448
Publication statusPublished - 28 Jul 2004
Externally publishedYes

Fingerprint

Superplastic deformation
strain rate
Strain rate
superplastic forming
failure modes
constitutive equations
cavitation flow
hemispheres
voids
Void fraction
grain size
Stability criteria
Constitutive equations
Cavitation
Failure modes
microstructure
Microstructure

Keywords

  • Finite Element Simulation
  • Microstructural Evolution
  • Optimum Forming
  • Stability Analysis
  • Superplastic Deformation

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Multi-scale analysis of failure during superplastic deformation. / Thuramalla, N. V.; Deshmukh, P. V.; Khraisheh, Marwan.

In: Materials Science Forum, Vol. 447-448, 28.07.2004, p. 105-110.

Research output: Contribution to journalArticle

Thuramalla, N. V. ; Deshmukh, P. V. ; Khraisheh, Marwan. / Multi-scale analysis of failure during superplastic deformation. In: Materials Science Forum. 2004 ; Vol. 447-448. pp. 105-110.
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