Strength estimation of silicon nitride ceramics using a round-notched specimen subjected to shearing-tool indentation

Abstract

his study aims to estimate the shear strength of a ceramics plate using a round-notched specimen subjected to shearing-tool indentation. The proposed shear test of notched specimen had advantage of stable initiation and was applied to compare with two kinds of commercial silicon nitride ceramics experimentally and numerically. To know the failure strength of two kinds of ceramics SNP02 and SNP03 and predict its crack propagation, virtual crack close technique (VCCT) was applied to the crack propagation model. By considering an appropriate resistance of damage model from the pre-cracked bending test, the propagation of the initial surface cracks was numerically detected. Through this discussion, the failure strength of crack occurrence with two kinds of ceramics was revealed.

Keywords

• ceramics
• round-notched specimen
• shear strength
• fracture toughness
• brittle