The modified Gurson model accounting for the void size effect

J. Wen, Y. Huang*, K. C. Hwang, C. Liu, M. Li

*Corresponding author for this work

Research output: Contribution to journalArticle

120 Scopus citations

Abstract

The Gurson model [J. Engrg. Mater. Technol. 99 (1977) 2] has been widely used to study the deformation and failure of metallic materials containing microvoids. The void volume fraction is the only parameter representing voids since the void size does not come into play in the Gurson model. Based on the Taylor dislocation model [Proc. R. Soc. (Lond.) A145 (1934) 362; J. Int. Metals 62 (1938) 307], we extend the Gurson model to account for the void size effect. It is shown that the yield surfaces for micron- and submicron-sized voids are significantly larger than that given by the Gurson model. For a voided, dilating material subject to uniaxial tension, the void size has essentially no effect on the stress-strain curve at small initial void volume fraction. However, as the initial void volume fraction increases, the void size effect may become significant.

Original languageEnglish (US)
Pages (from-to)381-395
Number of pages15
JournalInternational journal of plasticity
Volume21
Issue number2
DOIs
StatePublished - Feb 1 2005

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Keywords

  • Gurson model
  • Spherical microvoid
  • Taylor dislocation model
  • Void size effect
  • Yield condition

ASJC Scopus subject areas

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

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