THERMAL GRAIN STRUCTURAL ANALYSIS.
Program progress rept. no. 5, 1-30 Apr 62,
LOCKHEED PROPULSION CO REDLANDS CALIF
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An engineering approximation to the correct theoretical temperature distribution in a propellant grain has been derived. A set of confirmatory experiments to the approxi mation is described. These experiments are in progress. The limit elastic solutions to several thermal stress problems are presented. These limit solutions are necessary in order to recognize the existence of the hypothesized stress accumulation problem. Experimental results of cyclic thermal inputs to a uniaxial, end-constrained bar are presented. The claim is made herein that the above test results confirm the hypothesis that there exists a cyclic thermal input whereby the resulting stresses exceed those obtained by a step input over the same temperature range. This confirmation is the crux of the purpose of this program. Finally, a rather comprehensive discussion of theory and experiment relative to the timetemperature shift phenomena is presented. Author