G0301304 Evaluation for Crack-Tip Toughness of Ceramic Materials by Vickers Indentation and Finite Element Analysis

Abstract

We proposed new evaluation method for crack tip fracture toughness in ceramic materials by a combination of Vickers indentation and finite element method. We paid attention to the smallest applied load of the radial crack which occurs to material surface by a Vickers indentation. The crack tip fracture toughness was decided based on the stress distribution by FEM analysis. Work hardening coefficient was measured by a Vickers indent observed using 3-D optical microscope. Pre-existing defect sizes were presumed from a material surface which was treated with a thermal etching. The validity of this evaluation method was compared with other evaluation method. It found out that this evaluation method is better than other ones.