Multi-scale analysis of failure during superplastic deformation

N. V. Thuramalla*, P. V. Deshmukh, M. K. Khraisheh

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

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
DOIs
Publication statusPublished - 2004
Externally publishedYes
EventSuperplasticity in Advanced Materials: 8th International Conference on Superplasticity in Advanced Materials, ICSAM 2003 - Oxford, United Kingdom
Duration: 28 Jul 200330 Jul 2003

Keywords

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

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