The void size effect in metallic materials

K. C. Hwang*, B. Liu, X. Qiu, Y. Huang

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


We have extended the Rice-Tracey model of void growth to account for the void size effect based on the Taylor dislocation model, and have found that small voids tend to grow slower than large voids. For a perfectly plastic solid, the void size effect comes into play through the ratio εl/R0, where / is the intrinsic material length on the order of microns, ε the remote effective strain, and R0 the void size. For micron-sized voids and small remote effective strain such that εl/R0<0.02, the void size influences the void growth rate only at high stress trivialities. However, for submicron-sized voids and relatively large effective strain such that εl/R0>0.2, the void size has a significant effect on the void growth rate at all levels of stress triaxiality. We have also obtained the asymptotic solutions of void growth rate at high stress trivialities accounting for the void size effect. For εl/R0>0.2, the void growth rate scales with the square of mean stress, rather than the exponential function in the Rice-Tracey model.

Original languageEnglish (US)
Pages (from-to)405-410
Number of pages6
JournalKey Engineering Materials
StatePublished - 2003
EventProceedings of the International Conference on Experimental and Computational Mechanics in Engineering - Dunhuang, China
Duration: Aug 24 2002Aug 27 2002


  • Strain gradient plasticity
  • Void growth rate
  • Void size

ASJC Scopus subject areas

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


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