Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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R-curve Analysis of Alumina Ceramics

알루미나 세라믹스의 R-curve 분석

  • 김성진 (포항공과대학교 재료·금속공학과) ;
  • 손기선 (포항공과대학교 재료·금속공학과) ;
  • 이성학 (포항공과대학교 재료·금속공학과) ;
  • 백성기 (포항공과대학교 재료·금속공학과)
  • Published : 1994.10.01
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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.

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References

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