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Article Dans Une Revue Journal of Non-Crystalline Solids Année : 2021

Environment dependence of KIc of glass

T. To
Fabrice Célarié
Yann Gueguen
Tanguy Rouxel
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Résumé

The role of temperature (T) and moisture on fracture toughness (KIc) of glasses, as measured by the single-edge precracked beam method (SEPB), is investigated. The brittle to ductile temperature, shown by an increase of KIc, is ~Tg. At T below 0.9Tg, the decrease of the bond strength with T results in the decrease of both the fracture surface energy and Young's modulus, so that KIc decreases with T. From above Tg to below 1.1Tg, the work of fracture increases because of dissipative processes, including confined viscoplasticity and blunting at the crack front. From 1.1Tg, viscous flow extends to the whole specimen and becomes more uniform, resulting in the macroscopic deformation of the specimen, eventually preventing against fracture. The results on humidity sensitive glasses show that both precracking and final fracture steps need to be performed in inert environment to meet the intrinsic KIc value, unless the test is fast enough. © 2021
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Dates et versions

hal-03249478 , version 1 (24-05-2023)

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Paternité - Pas d'utilisation commerciale

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Citer

T. To, Fabrice Célarié, Yann Gueguen, N.G. Brou, C. Lim, et al.. Environment dependence of KIc of glass. Journal of Non-Crystalline Solids, 2021, 566, pp.120873. ⟨10.1016/j.jnoncrysol.2021.120873⟩. ⟨hal-03249478⟩
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