Abstract
A fracture-mechanical analysis is presented for stability criteria and propagation behavior of thermal stress cracks in brittle ceramics in environments so severe that initiation cannot be avoided. It is based on a mechanical model consisting of a rigidly constrained, uniformly cooled thin flat plate with a uniform distribution of microcracks; results are qualitatively similar to those obtained for a three-dimensional body with penny-shaped cracks. High stability of thermal stress cracks is attained in materials with high values of surface fracture energy, and low values of thermal expansion and Young’s modulus. On catastrophic propagation of an initially short crack, the final crack is subcritical and has a length which is independent of material properties but depends only on the initial crack length and the crack density. It is suggested that materials with very high thermal shock resistance can be developed by synthesizing materials with high densities of microcracks.
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© 1971 Plenum Press, New York
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Hasselman, D.P.H. (1971). Thermal Stress Crack Stability and Propagation in Severe Thermal Environments. In: Kriegel, W.W., Palmour, H. (eds) Ceramics in Severe Environments. Materials Science Research, vol 5. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3141-4_7
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DOI: https://doi.org/10.1007/978-1-4684-3141-4_7
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