Effect of state of stress on the cavitation behavior of Al 5083 superplastic material

Namas Chandra, Marwan K. Khraisheh, Peter Kalu

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

In this paper we address the controversial issue of nucleation of cavities in Al 5083 alloys and their subsequent growth to coalescence and failure. We focus on the origin and growth of cavities not only during the primary processing of Al 5083 in sheet forms, but also during the manufacture of these sheets into SPF (superplastic forming) components. Experimental observations of pre-existing cavities in this alloy are made using optical and electron microscopy. The role of sheet rolling direction, and the state of stress during superplastic deformation on the cavity formation and coalescence are also discussed. The effect of the state of stress (uniaxial, plane strain, balanced biaxial, and tri-axial) on the growth characteristics of cavitation is also examined. It is found that the uniaxial model based cavitation cannot directly be extended to predict the behavior of more complex stress states, unless great care is taken to identify the right strain measure for the mapping process.

Original languageEnglish
Pages (from-to)2931-2936
Number of pages6
JournalMaterials Science Forum
Volume475-479
Issue numberIV
Publication statusPublished - 26 Apr 2005
EventPRICM 5: The Fifth Pacific Rim International Conference on Advanced Materials and Processing - Beijing, China
Duration: 2 Nov 20045 Nov 2004

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Keywords

  • Al 5083
  • Cavitation
  • Multi-axial state of stress

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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