Abstract
Static fatigue behaviour in various kinds of non-transforming ceramics has been investigated. It was found that static fatigue is closely related to the presence of a glassy phase between adjacent grains, as well as fracture toughness. Non-oxide ceramics, such as reaction-bonded silicon nitride which scarcely contains the glassy phase (group I), are insensitive to static fatigue, whereas non-transformation oxide ceramics, like alumina and non-oxide ceramics such as silicon nitride which contains the glassy phase (group II), are sensitive to static fatigue. However, static fatigue behaviour in the materials of group II also depends strongly on fracture toughness. K IC. Namely, fatigue parameter n increases linearly as K IC increases. From such a dependence the life time relation in the materials of group II is proposed as \(t_s = B\sigma _s^{ - CK_{IC} } \) in terms of applied stress σS and K IC.
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Choi, G., Horibe, S. Static fatigue in ceramic materials: influences of an intergranular glassy phase and fracture toughness. JOURNAL OF MATERIAL SCIENCE 28, 5931–5936 (1993). https://doi.org/10.1007/BF00365203
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DOI: https://doi.org/10.1007/BF00365203