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This paper reviews the micromechanisms associated with fatigue effects in monolithic non-transforming ceramics. The fatigue effect refers to the difference in lifetime observed between cyclic and static loading conditions. At room temperature the fatigue effect is negligible for materials which fail transgranularly, and a negative effect occurs in materials with intergranular failure modes. Whereas at low temperature the fatigue effect is cycle dependent, ie related to the number of crack opening/closure events, frequency dependent phenomena determine the fatigue effect at high temperature. Specifically, the effect of fatigue loading at high temperature is controlled by the amount and viscosity of the grain boundary phase.

Additional information

Authors: STEEN M, JRC Petten (NL)
Bibliographic Reference: Paper presented: International Conference on Deformation and Fracture of Structural P/M Materials, Stara Lesna (SK), October 13-16, 1996
Availability: Available from (1) as Paper EN 40307 ORA
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