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The Fracture Toughness of Inorganic Glasses
Tanguy Rouxel  1@  , Satoshi Yoshida  2@  , Theany Tô  1@  , Tanguy Lacondémine  1@  , Julien Moriceau  1@  , Fabrice Célarié  1@  , Yann Gueguen  1@  , Patrick Houizot  1@  
1 : University of Rennes 1, IPR, UMR UR1-CNRS 6251, Department of Glass Mechanics  (UR1)  -  Website
CNRS : UMR6251
University of Rennes 1, Rennes 35042 -  France
2 : University of Shiga Prefecture
Hikone, Shiga -  Japan

Measuring the fracture toughness (KIc) of glasses still remains a difficult task, raising experimental and theoretical problems as well. The available methods to estimate KIc are reviewed. The critical flaw size, and the indentation load for the onset of crack initiation are discussed, in the light of the fundamentals of fracture mechanics and classical background regarding the mechanics of brittle materials. Analytical expressions were further proposed to predict the fracture energy and fracture toughness of glasses from different chemical systems from their nominal compositions. The theoretical values were compared with the experimental ones, as obtained by self-consistent methods such as the SEPB method. The remarkable agreement observed in most cases suggests that measured KIc values correspond to the crack propagation regime (as opposed to the crack initiation threshold), and supports previous investigations in glasses and ceramics, which showed that a crack tip is nearly atomically sharp in these materials (but for metallic glasses).



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