Abstract
Three-point bending, 4-point bending and tensile fatigue tests were carried out on sintered silicon nitride at room temperature and 1000°C, and size effect on the fatigue behavior was discussed. The difference in room temperature fatigue behavior estimated by different testing methods was explained by effective volume of the surface layer with a depth of 100μm. At high temperature, the difference was explained substantially by the effective volume of the whole specimen, but, the tensile fatigue data did not agree with the bending one in a low stress region in spite of the data correction by effective volume. The different cavitation effects on crack growth properties under bending and tensile loading conditions were considered to be responsible for the disagreement.
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