Mechanisms of reversible and irreversible loss of mechanical properties of elastomeric vulcanizates which occur at elevated temperatures /
Thor L. Smith.
Description
- Language(s)
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English
- Published
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Wright-Patterson Air Force Base, Ohio : Directorate of Materials and Processes, Aeronautical Systems Division, Air Force Systems Command, [1962]
- Summary
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Strength characteristics of five elastomeric gum vulcanizates were investigated over a wide range of conditions. Results from continuous and intermittent stress-relaxation evaluations made between 100° and 200° C showed that the thermal stabilities of the vulcanizates decrease in the following order: hydrofluorocarbon, resin-cured butyl, silicone, sulfur-cured butyl, and natural rubber. Tensile properties of each vulcanizate in the absence of thermal degradation were determined with an Instron tester at about 10 strain rates and 10 temperatures. Except for natural rubber, the ultimate tensile properties of each vulcanizate could be characterized by a time- and temperature-independent failure envelope which results from a plot of log sigma sub b 273/T vs. log epsilon sub b where sigma sub b is the tensile strength and epsilon sub b is the ultimate strains. No fundamental differences seem to exist in the strength characteristics of the various vulcanizates provided they are compared in corresponding temperature and physical states. Stress-strain curves for natural rubber were analyzed to separate time and finite- strain effects. Between -20° and 100° C, the stress-strain data were time independent although they are temperature dependent.
- Note
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"June 1962."
"Project no. 7342, task no. 734202."
Cover title.
- Physical Description
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ix, 169 pages :
illustrations ;
28 cm.
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