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Viscoelastic Indentation of Silicate Glasses
Author(s) -
Sakai Mototsugu,
Shimizu Satoshi,
Ito Seturo
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00247.x
Subject(s) - viscoelasticity , rheology , materials science , silicate , indentation , composite material , microprobe , silicate glass , microstructure , constitutive equation , deformation (meteorology) , mineralogy , thermodynamics , geology , chemistry , finite element method , physics , organic chemistry
The time‐dependent viscoelastic deformation and flow of various types of silicate glasses are examined by the use of a pyramidal Berkovich indenter. It is demonstrated that a pyramidal indenter is an efficient microprobe for viscoelastic studies of glass‐forming materials at temperatures near the glass transition point. Some important rheological functions of silicate glasses are determined as functions of time on the basis of a linear viscoelastic constitutive equation for pyramidal indentation. The test results are theoretically related to the dimension of flow units of these glasses, suggesting that a model of thermally fragmented silicate clusters is appropriate for consistently understanding the present rheological test results. However, the microstructural details (crystallite‐like or network‐like microstructures) of fragmented clusters are not inferred from the rheological information.