|
|
|
Journal of the Korean Ceramic Society 1994;31(10): 1099. |
| 알루미나 세라믹스의 R-curve 분석 |
| 김성진, 손기선, 이성학, 백성기 |
| 포항공과대학교 재료·금속공학과 |
| R-curve Analysis of Alumina Ceramics |
|
|
|
|
|
|
|
| ABSTRACT |
|
It is suggested that the microstructural toughening process in the initial rising portion of R-curves observed in polycrystalline alumina should be different from the grain bridging mechanism identified in the long crack regime. Microcracking in the advancing crack front seems to be a prerequisite for the development of unbroken bridging ligaments behind the crack tip. In order to test such a proposition, attempts were made to identify experimentally the presence of microcracks in the frontal zone of propagating cracks. In-situ observation is made of crack growth in a miniature double cantilever beam specimen of a average grain size of 10 ${mu}{textrm}{m}$ alumina. Presence of a few microcracks was identified in front of crack tip on the propagating crack plane. The R-curves were re-evaluated based on the observation. |
|
|
|
PDF Links
Full text via DOI 
Download Citation 
