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R-Curve Behavior and The Mechanical Properties of Transformation-Toughened ZrO2-Containing Ceramics

Published online by Cambridge University Press:  28 February 2011

R. W. Steinbrech  and
A.H. Heuer
R. W. Steinbrech
Affiliation:
Department of Metallurgy and Materials Science Case Western Reserve University, Cleveland, Ohio 44106
A.H. Heuer
Affiliation:
Department of Metallurgy and Materials Science Case Western Reserve University, Cleveland, Ohio 44106
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Abstract

Current understanding of R-curve behaviour and the strength-toughness relationship of transformation-toughened ZrO2-containing ceramics is reviewed. If the toughness increases with crack, extension along an R-curve, a maximum in strength versus toughness is observed, which is related to the crack instability criterion for R-curves. An analytical expression from a well-known “wake” theory of crack tip shielding due to McMeeking and Evans is used to compute R-curves and strength/toughness relations, which are compared with experiment.

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