Multiscale - Based optimization of superplastic forming

Naveen V. Thuramalla, Marwan Khraisheh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Citations (Scopus)

Abstract

The stability of superplastic deformation under biaxial plane stress condition is - investigated. A new multiscale stability criterion is developed that accounts for both geometrical instabilities and microstructural features including grain growth and cavitation. This is achieved by combining a modified microstructure-based constitutive equation for superplastic deformation (SPD) with grain and cavitation evolution equations. These equations are then incorporated into the framework of Hart's stability analysis. The proposed criterion is then used to design optimum forming profiles based on variable strain rate loading paths. The effects of cavitation and biaxiality ratio on the stability of deformation are also investigated. The results clearly show the importance of accounting for both geometrical and microstructural features into the stability analysis. At the early stages of deformation, stability is dominated by geometrical considerations and as deformation continues, the effects of cavitation become more dominant.

Original languageEnglish
Title of host publicationTransactions of the North American Manufacturing Research Institute of SME
Pages637-643
Number of pages7
Volume32
Publication statusPublished - 2004
Externally publishedYes
EventPapers Presented at NAMRC 32 - Charlotte, NC, United States
Duration: 1 Jun 20044 Jun 2004

Other

OtherPapers Presented at NAMRC 32
CountryUnited States
CityCharlotte, NC
Period1/6/044/6/04

Fingerprint

Cavitation
Superplastic deformation
Stability criteria
Constitutive equations
Grain growth
Strain rate
Microstructure

Keywords

  • Biaxial Deformation
  • Cavitation
  • SPF Optimization
  • Stability Analysis
  • Superplastic Forming

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Thuramalla, N. V., & Khraisheh, M. (2004). Multiscale - Based optimization of superplastic forming. In Transactions of the North American Manufacturing Research Institute of SME (Vol. 32, pp. 637-643)

Multiscale - Based optimization of superplastic forming. / Thuramalla, Naveen V.; Khraisheh, Marwan.

Transactions of the North American Manufacturing Research Institute of SME. Vol. 32 2004. p. 637-643.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Thuramalla, NV & Khraisheh, M 2004, Multiscale - Based optimization of superplastic forming. in Transactions of the North American Manufacturing Research Institute of SME. vol. 32, pp. 637-643, Papers Presented at NAMRC 32, Charlotte, NC, United States, 1/6/04.
Thuramalla NV, Khraisheh M. Multiscale - Based optimization of superplastic forming. In Transactions of the North American Manufacturing Research Institute of SME. Vol. 32. 2004. p. 637-643
Thuramalla, Naveen V. ; Khraisheh, Marwan. / Multiscale - Based optimization of superplastic forming. Transactions of the North American Manufacturing Research Institute of SME. Vol. 32 2004. pp. 637-643
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