Effects of grain boundary sliding on creep-constrained boundary cavitation and creep deformation

K. J. Hsia, D. M. Parks, A. S. Argon

Research output: Contribution to journalArticlepeer-review

Abstract

Creep of polycrystalline materials was modeled using a periodic array of plane strain hexagonal grains. Effects of grain boundary sliding on such an array containing a distribution of boundary facet cracks were investigated using the finite element method. The facet crack opening rate in a creeping material with grain boundary sliding and the energy release rate due to the development of a facet crack were studied parametrically in terms of the creep exponent n, equivalent stress triaxiality S/σe and crack density p. The results were generalized to the 3-D case of penny-shaped cracks. As an application, the grain boundary cavity growth rate under a creep-constrained condition and the creep constitutive equation, all with grain boundary sliding, were obtained and compared with the non-sliding boundary case. The results show that both cavity growth rate and creep strain rate are substantially increased, and become more sensitive to stress triaxiality if grain boundary sliding is considered.

Original languageEnglish (US)
Pages (from-to)43-62
Number of pages20
JournalMechanics of Materials
Volume11
Issue number1
DOIs
StatePublished - Mar 1991

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Mechanics of Materials

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