Article ID Journal Published Year Pages File Type
5440881 Journal of the European Ceramic Society 2017 11 Pages PDF
Abstract

This work aims at evaluating the fracture toughness of brittle materials by spherical indentation. The cone-cracking is simulated by the extended finite element method (XFEM) in Abaqus. The formation of a kinked-cone-crack is observed when the indenter comes into (second) contact with the surface part outside the ring-crack. The effects of friction, Poisson's ratio and cone-crack kinking on the Roesler's constant κc are analyzed. Based on numerical results, the Roesler's method for evaluating the fracture toughness is enhanced by considering kinked-cone-crack. By performing systematic XFE analyses, a database for enhanced Roesler's constant κc | kink is provided for the fracture toughness evaluation of brittle materials. Finally, the proposed method is verified by conducting spherical indentation tests on soda-lime glass specimens.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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