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• W1985149706 endingPage "134" @default.
• W1985149706 startingPage "124" @default.
• W1985149706 abstract "We report on the loading-rate dependence of localized plastic deformation in inorganic covalent, metallic, ionic and superionic glasses. For this, the strain-rate sensitivity is determined through instrumented nanoindentation in a load-controlled strain-rate jump test. Through relating the strain-rate sensitivity to the reduced temperature, the packing density, the network dimensionality and the average single bond strength of the system, a qualitative mechanistic description of the strain-mediating process is possible. A strong variability of strain-rate sensitivity is obtained only at intermediate values of packing density, network connectivity or bond strength, when other parameters such as chemical composition and specific structural arrangement are dominating the deformation process. On the other side, for high bond strength and connectivity or for high packing density, the strain-rate sensitivity of the considered glasses is always low, which is also confirmed through the dependence of strain-rate sensitivity on Poisson ratio. Here, only for glasses with a Poisson ratio of ~ 0.3–0.4 we observe a wide variability of the loading-rate dependence of local deformation. For higher or lower Poisson ratio, the observed dependence is always low: when the limiting factor in deformation is primarily network connectivity and bond strength or packing density, respectively, once an activation barrier is overcome, deformation is only weakly loading-rate-dependent. This is regardless of the height of the activation barrier. When approaching the glass transition temperature, high strain-rate sensitivity is observed only in glasses where non-Newtonian flow is expected also in the corresponding liquid. • The strain-rate sensitivity of local deformation in covalent, metallic and ionic glasses is studied. • A strain-rate jump test through instrumented nanoindentation is adopted for brittle glasses. • Correlations between strain-rate sensitivity and Poisson ratio, packing density, bond strength and temperature are discussed." @default.
• W1985149706 created "2016-06-24" @default.
• W1985149706 creator A5021241484 @default.
• W1985149706 creator A5043214376 @default.
• W1985149706 creator A5089740992 @default.
• W1985149706 date "2014-11-01" @default.
• W1985149706 modified "2023-10-06" @default.
• W1985149706 title "Strain-rate sensitivity of glasses" @default.
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