Dependence of Ultimate Strength of Glass Under Constant Load on Temperature, Ambient Atmosphere, and Time

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Abstract
It is widely known that the strength of glass specimens is strongly dependent on many factors, including (1) the flaws and/or scratches on the surface, (2) the ambient atmosphere, (3) the temperature, (4) the duration of the test, and (5) the type of stress system imposed on the specimen. In this paper the authors develop several equations that relate the average strength of glass under constant load to the duration of the test, to the temperature of the test, and to the ambient atmosphere. The data of T. C. Baker and his co‐workers are used to calculate the various parameters which appear in the resultant equations. Additional experiments are suggested as a basis for further verification and/or modification of the theory.

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