The flow of glass at high stress levels. I. Non-Newtonian behavior of homogeneous 0.08 Rb2O·0.92 SiO2 glasses

J. H. Li; D. R. Uhlmann

doi:10.1016/0022-3093(70)90108-0

The flow of glass at high stress levels. I. Non-Newtonian behavior of homogeneous 0.08 Rb₂O·0.92 SiO₂ glasses

J. H. Li, D. R. Uhlmann

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Abstract

A homogeneous 0.08 Rb₂O·0.92 SiO₂ glass has been tested at temperatures between 480 and 555°C (low-stress viscosities between 10^17.1 and 10^13.5 poise) and at stress levels up to 10^9.5 dyne/cm² or more. At low stress levels, Newtonian behavior was observed; at stress levels above some critical stress, the viscosity was observed to decrease with increasing stress. This critical stress for non-Newtonian flow was found to be about 10^9.1 dyne/cm², approximately independent of temperature. The variation of the viscosity with stress in the high-stress region can be described by absolute rate theory only by assuming a flow volume which increases with increasing stress.

Original language	English (US)
Pages (from-to)	127-147
Number of pages	21
Journal	Journal of Non-Crystalline Solids
Volume	3
Issue number	1
DOIs	https://doi.org/10.1016/0022-3093(70)90108-0
State	Published - Jan 1970
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

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10.1016/0022-3093(70)90108-0

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abstract = "A homogeneous 0.08 Rb2O·0.92 SiO2 glass has been tested at temperatures between 480 and 555°C (low-stress viscosities between 1017.1 and 1013.5 poise) and at stress levels up to 109.5 dyne/cm2 or more. At low stress levels, Newtonian behavior was observed; at stress levels above some critical stress, the viscosity was observed to decrease with increasing stress. This critical stress for non-Newtonian flow was found to be about 109.1 dyne/cm2, approximately independent of temperature. The variation of the viscosity with stress in the high-stress region can be described by absolute rate theory only by assuming a flow volume which increases with increasing stress.",

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Y1 - 1970/1

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AB - A homogeneous 0.08 Rb2O·0.92 SiO2 glass has been tested at temperatures between 480 and 555°C (low-stress viscosities between 1017.1 and 1013.5 poise) and at stress levels up to 109.5 dyne/cm2 or more. At low stress levels, Newtonian behavior was observed; at stress levels above some critical stress, the viscosity was observed to decrease with increasing stress. This critical stress for non-Newtonian flow was found to be about 109.1 dyne/cm2, approximately independent of temperature. The variation of the viscosity with stress in the high-stress region can be described by absolute rate theory only by assuming a flow volume which increases with increasing stress.

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The flow of glass at high stress levels. I. Non-Newtonian behavior of homogeneous 0.08 Rb₂O·0.92 SiO₂ glasses

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