By Edited by Pietro VINCENZINI World Academy of Ceramics and National Research Council, Italy Co-edited by James P. BENNETT NETL – USDOE, USA

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Additional info for 12th INTERNATIONAL CERAMICS CONGRESS PART I Proceedings of the 12 th International Ceramics Congress, part of CIMTEC 2010- 12 th International Ceramics Congress and 5th Forum on New Materials Montecatini Terme, Italy, June 6-11, 2010 PART I including: Sym

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Further the author thanks I. Petschenig for contributing to laboratory investigations. D. K. R. , New York, London, Sydney, Toronto, 1976). H. Hasselman: J. Am. Ceram. Soc. Vol. 52 (1969), p. 600 [3] H. K. Tschegg: Fatigue Fract. Engng Mater. Struct. Vol. 20 (1979), p. K. Tschegg, Austrian Patent Specification AT 390 328 (1986) [5] E. K. Tschegg: Materialprüfung Vol. 33 (1991), p. K. T. Fendt, Ch. Manhart and H. Harmuth: Engineering Fracture Mechanics Vol. 76 (2009), p. J. C. H. Hasselman: Ceramic Bulletin Vol.

Ft2 (4) Here the specific fracture energy GF is relative to the single fracture surface so that GF=2γ and lch=2R’’’’. The characteristic length is inversely proportional to a so called brittleness number B [3]: B= ft 2 ⋅ L L = . GF ⋅ E lch (5) In Eq. 5 L is a significant specimen dimension. The brittleness number is proportional to the ratio of elastic strain energy stored in the specimen at the moment of crack initiation to the fracture energy necessary for total partition into two pieces. For geometrically similar specimens brittleness increases with rising B.

5: Damage in an andalusite based monolithic castable. Strain fields, obtained from performing the DIC method during a room temperature test on the 700°C fired andalusite based monolithic castable, allow observing the development of the strain localization phenomenon and of the progressive initiation of a macrocrack that will lead to the sample failure (figure 6) [3]. Such a method makes possible to detect strain localization sites earlier to classical strain measurements, for example with contact extensometers.

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