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Journal of the Korean Ceramic Society 1997;34(2): 157. |
| 구조용 세라믹스 강도의 신뢰성 평가에 관한 연구 |
| 김부안, 남기우 |
| 부경대학교 재료공학과 |
| Study on the Reliability of Engineering Ceramics |
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| ABSTRACT |
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Silicon Nitride samples with different microstructure were prepared by hot pressing and subsequent heat treatment under N2 gas pressure. The fracture toughness (KIC)of Si3N4 increased with the increase of grain size, but the bending strength of plain specimen($sigma$F) decreased. The relation between fracture stress($sigma$c) and equivalent crack length(ae) agreed well with the calculated values by process zone size failure criterion. A probabilistic failure assessment curve is proposed based on both statistical character of $sigma$F and KIC. |
| Key words:
Fracture toughness, Microcrack, Process zone failure criterion, Grain growth, Failure assessment diagram |
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