Abstract
The relation between the static fatigue life at 1000°C and the thickness of a skin layer was investigated using silicon nitride specimens having an as-sintered surface. Using the same specimens, a room-temperature proof test was carried out, and the fatigue life distribution at 1000°C of the specimens subjected to the proof test was compared with that of the untreated specimens. The results obtained are summarized as follows. (1) The thickness of the skin layer influences the static fatigue life at 1000°C, and the fatigue life decreases with increasing thickness of the skin layer. (2) The minimum fatigue life of the specimens subjected to the proof test is not dependent only on the maximum flaw size that corresponds to the proof stress, but it is also dependent on the thickness of the skin layer.
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