Effect of Stable Crack Growth on Fracture Toughness Determination for Hot-Pressed Silicon Nitride at Elevated Temperatures
Authors:
- 1 January 1981
- book chapter
- Published by ASTM International
- p. 69-84
Abstract
Fracture toughness of hot-pressed silicon nitride was determined between room temperature and 1300°C using four-point bend specimens with straight-through and chevron notches. For T > 1100°C fracture toughness increases due to crack branching and secondary cracking caused by the viscous flow of the grain boundary phase. To determine correct K-values with the specimens having a straight-through notch the stable crack extension at T > 1100°C has to be taken into account.Keywords
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