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Comparison Between Heat‐Transfer Conditions and Setting Up of Strain in Glass During Heat‐Treatment
Author(s) -
ACLOQUE PAUL
Publication year - 1961
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.1151-2916.1961.tb15922.x
Subject(s) - tempering , materials science , thermodynamics , thermal , anisotropy , composite material , optics , physics
The properties of transparency and artificial anisotropy in glass were utilized in making a film recording of the development and evolution of thermal strains in glass specimens undergoing rapid cooling or heating. Discussed as examples are the traditional tempering treatment and the more original “temnization” treatment (to use a word coined by the writer several years ago). The mean temperature of the specimens was measured during these treatments by a calorimetric method, and from the representative curve of the mean temperature the temperature distribution at each instant throughout the specimens was deduced by calculation, using simple hypotheses. It was then possible to compare the distribution curves of strain with the distribution curves of temperature and from this comparison to explain certain phenomena such as the existence of conditions for “strain inversion” during tempering and conditions for “strain reversion” during temnization. This investigation is the preliminary stage of a more detailed examination of the behavior of a visco‐elastic body under variable temperature conditions when its viscosity is temperature‐dependent.