Analysis of Bridging Stress Effect of Polycrystalline aluminas Using Double Cantilever Beam Method

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J. Korean Ceram. Soc. > Volume 33(5); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(5): 583.

Double Cantilever Beam 방법을 이용한 다결정 알루미나의 Bridging 응력효과 해석

손기선, 이선학, 백성기

포항공과대학교 항공재료연구센터

Analysis of Bridging Stress Effect of Polycrystalline aluminas Using Double Cantilever Beam Method

ABSTRACT

In this study a new analytical model which can describe the relationship between the bridging stress and microstructure has beenproposed in order to investigate the microstructural effect on the R-curve behavior in polycrystalline aluminas since the R-curve can be derived via the bridging stress function. In the currently developed model function the distribution of grain size is considered as a microstructural factor in modeling of bridging stress function and thus the bridging stress function including three constants PM, n, and Cx, can be established analytically and quantitatively. The results indicate that the n value is closely related to the grain size distribution thereby providing a reliability of the current model for the bridging stress analysis. Thus this model which explains the correlation of the bridging stress distribution and microstructual parame-ters is useful for the systematic interpretation of microfracture mechanism including the R-curve behavior in polycrystalline aluminas.

Key words: R-curve behaivor, Bridging stress function, Grain size distribution, Microstructural parameter