Observations on the Sub-Critical Growth and Healing of Micro-Cracks in Brittle Ceramics
Micro-cracking in brittle composites was monitored by measuring the temperature dependence of thermal diffusivity by the laser flash method. Depending upon the material system, micro-cracks can exhibit a time dependent growth or healing or a combination of both. A theoretical basis for these observations was established by analyzing the stability and nature of crack propagation of precursor micro-cracks in a spherical inclusion contained in an infinite matrix with different elastic properties.
KeywordsThermal Diffusivity Crack Size Crack Density Subcritical Crack Growth Crack Healing
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- 2.D.P.H. Hasselman and J.P. Singh, J. Am. Ceram. Soc, 58:856 (1979).Google Scholar
- 6.A.G. Evans and D. R. Clarke, in “Proc. Intl. Conf. on Thermal Stresses in Materials and Structures in Severe Thermal Environments,” D.P.H. Hasselman and R. Heller, eds., Plenum Press, N.Y. (in press).Google Scholar
- 8.H.J. Siebeneck, J. J. Cleveland, D.P.H. Hasselman and R. C. Bradt, in: “Ceramic Microstructures’ 76”, R. M. Fulrath and J. A. Pask, eds., Westview Press, Boulder, Colorado (1977).Google Scholar
- 9.J.P. Singh, D.P.H. Hasselman, W.M. Su, J.A. Rubin and R. Palicka, J. Mat. Sc, (in press).Google Scholar