Models for Relative Density and Compressive Strength of Open-Cell Ceramics with Hollow Struts

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J. Korean Ceram. Soc. > Volume 34(11); 1997 > Article

Journal of the Korean Ceramic Society 1997;34(11): 1139.

공동골격을 가진 개방셀 세라믹스의 상대밀도와 압축강도 모델

정한남, 현상훈¹

포항산업과학연구원 박판주조연구팀
¹연세대학교 세라믹공학과

Models for Relative Density and Compressive Strength of Open-Cell Ceramics with Hollow Struts

ABSTRACT

A model for predicting the relative density and the compressive strength of open-cell ceramics with three-dimensional network structure was proposed through the interpretation of their macrostructure and fracture mechanics. The equation predicting the relative density was derived under the assumption that the open-cell structure was a periodic array of the tetrakaidecahedron unit cell consisting of cylindrical struts containing the internal hollow with the shape of a triangular prism. The model for compressive strength of open-cell ceramics with the hollow strut was also developed by modifying conventional model which based on fracture behavior of them subjected to the compressive stress. Both the relative density and the compressive strength were expressed in terms of the ratio of the strut diameter to the length together with the ratio of the hollow size to the strut diameter. The proposed model for the relative density and the compressive strength of the alumina-zirconia composite with open-cell structure were accorded well with the experimental values, whereas Gibson-Ashby and Zhang's model did not show such a good agreement.

Key words: Open-cell ceramics, Hollow-strut structure, Relative density model, Compressive strength model