Redistribution of Stresses During Creep-Bending of Grain-Boundary Sliding Materials

  • J. R. Dryden
  • D. F. Watt
Part of the Materials Science Research book series (MSR, volume 14)


A finite-element model has been developed to examine the effect of a viscous intercrystalline boundary phase on the distribution of stresses and displacement rates during creep. In particular, the model has been applied to bending where the principal creep mechanism is assumed to be grain-boundary sliding. The model shows that the usual method of calculating the stress distribution is reasonably accurate for the very early stages of creep but it becomes increasingly inaccurate as strain proceeds. The resulting stress redistribution during creep-bending is quite different from that normally encountered.


Residual Stress Silicon Nitride Neutral Axis Maximum Tensile Stress Stress Redistribution 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J.A. Mangels and D.F. Watt, Creep behaviour of reaction sintered Si3N4, paper presented at the 6th Annual Meeting Am. Cer. Soc., Chicago (1974).Google Scholar
  2. 2.
    A.G. Evans and S.M. Wiederhorn, Crack propagation and failure prediction in silicon nitride at elevated temperatures, J. Mat. Sci. 9: 270 (1974).CrossRefGoogle Scholar
  3. 3.
    P.E. Hart and J.A. Pask, Effect of LiF on creep of MgO, J. Amer. Ceram. Soc, 54: 315 (1971).CrossRefGoogle Scholar
  4. 4.
    Salah Ud Din and P.S. Nicholson, Creep of hot-pressed silicon nitride, J. Mat. Sci. 10: 1375 (1975).CrossRefGoogle Scholar
  5. 5.
    F.F. Lange, Non-elastic deformation of polycrystals with a liquid boundary phase, Technical Report #1, Sept. 23, 1974, ARPA 2697, Westinghouse Electric Corp., Research and Development Center.Google Scholar
  6. 6.
    J. Dryden and D.F. Watt, Viscous creep in a two-phase system, paper presented at the 24th Canadian Metal Physics Conference, Kingston (1974).Google Scholar
  7. 7.
    J. Dryden, “A Computer Simulation of Creep in Certain Two-Phase Materials”, Ph.D. Thesis, University of Windsor, Windsor (1977).Google Scholar
  8. 8.
    A.H. Cottrell, “The Mechanical Properties of Matter”, p. 223–225, John Wiley and Sons, New York, (1964).Google Scholar
  9. 9.
    E.R. Braithwaite, “Lubrication and Lubricants”, 23, Elsevier Pub. Co., New York (1967)Google Scholar

Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • J. R. Dryden
    • 1
  • D. F. Watt
    • 2
  1. 1.Whiteshell Nuclear Research EstablishmentPinawaCanada
  2. 2.Department of Engineering MaterialsUniversity of WindsorWindsorCanada

Personalised recommendations