The effects of stress state and cavitation on deformation stability during superplastic forming

Mohammad A. Nazzal, Marwan K. Khraisheh

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The current available models describing superplastic deformation do not account for a number of important characteristics, leading to the current limited predictive capabilities of deformation and failure. In this work, the effects of cavitation and stress state on deformation stability during superplastic forming are investigated using Finite Element simulations. The simulations are performed using constant strain rate forming and using a proposed optimization approach based on a multiscale failure criterion that accounts for stress state, geometrical necking, and microstructural evolution including grain growth and cavitation. The simulations are conducted for the superplastic copper-based alloy Coronze-638 and the superplastic aluminum alloy Al-5083 which are known to develop significant cavitation during deformation. The results clearly show the importance of accounting for microstructural evolution during superplastic forming, especially when the state of stress is biaxial. Furthermore, the results highlight the effectiveness of the proposed optimization technique in reducing the forming time and maintaining the integrity of the formed parts.

Original languageEnglish
Pages (from-to)200-207
Number of pages8
JournalJournal of Materials Engineering and Performance
Volume16
Issue number2
DOIs
Publication statusPublished - 1 Apr 2007

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Keywords

  • Cavitation
  • Finite element modeling
  • Optimum forming
  • Stability analysis
  • Superplastic forming

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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