THERMOPHYSICAL PROPERTIES OF PLASTIC MATERIALS AND COMPOSITES TO LIQUID HYDROGEN TEMPERATURE (-423F).
Rept. for Jul 62-Feb 64
GENERAL DYNAMICS/ASTRONAUTICS SAN DIEGO CALIF
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The primary objectives of the program were to select a series of plastics and composites by a survey of the Aerospace Companies, most likely to be used for cryogenic applications, and to determine the thermophysical properties of these materials from -423 to 75F. This information is required for use in the design of current and proposed missiles and space vehicles which utilize cryogenic propellants or are exposed to the cryogenic conditions of a space environment. Existing room temperature test methods for the determination of specific heat, thermal conductivity and thermal expansion were modified so that measurements could be made at temperatures down to -423F. Seventeen materials were evaluated. Thermal conductivity measurements on laminated materials parallel to a continuous reinforcement were as much as four times as high as measurements made normal to the reinforcement. The use of higher conductivity reinforcements resulted in higher conductivity laminates. Thermal expansion measurements on laminated materials showed that in the direction normal to the reinforcement, the component with the largest coefficient of thermal expansion has the greatest influence on the overall expansion. In directions parallel to the reinforcement, the expansion of the higher modulus component controlled the overall expansion. Author