Biaxial Fracture Behavior of Alumina Ceramics : Indentation Effect on Ball-on-3-ball Test

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J. Korean Ceram. Soc. > Volume 37(7); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(7): 713.

압입에 따른 알루미나 세라믹스의 이축 파괴 거동

정성민, 박성은, 이홍림

연세대학교 세라믹공학과

Biaxial Fracture Behavior of Alumina Ceramics : Indentation Effect on Ball-on-3-ball Test

ABSTRACT

The biaxial fracture behavior of alumina ceramics was studied using ball-on-3-ball test. The polished surfaces of alumina specimens were indented at 0mm, 1mm, 2mm, 3mm apart from the center of the specimen along path A, passing between the two supporting balls from the center of the specimen, and along path B, passing above the three supporting balls from the center of the specimen. The fracture strength of the indented specimens was measured using the ball-on-3-ball test, a kind of biaxial strength test. The fracture strength increased with increasing the distance from the center to indented position. The fracture strength of the specimen indented along path B was higher than that of the specimens indented along path A. It was presented that the fracture caused by tangential stress rather than radial stress when the indented positions are 1mm and 2mm from the center of the specimen. This phenomenon was in good agreement with FEM analysis.

Key words: Alumina, Biaxial strength test, FEM, Indentation, ANSYS