CRYOGENIC STRETCH-FORMING OF SOLID PROPELLANT ROCKET CASES.
Quarterly rept. 8 for 1 Mar 63-31 May 64,
ARDE-PORTLAND INC PARAMUS N J
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The effect of closer die tolerances and additional overpressure on the out-of-roundness of the Pershing subscale cases was examined and determined to significantly reduce the tolerances on the vessel. The effect of the addition of skirts and end rings to stretched Pershing subscale vessels on the room temperature strength level was determined. No significant decrease in yield strength of the vessel was noted. Some problems in the spinning of the components for the full scale preform were encountered and overcome. Design analysis of the stresses encountered during the stretching of both the subscale and projected full scale cases indicated marginal stresses in the vicinity of the juncture of the aft cone and the aft cylinder of the preform. Design of a preform for a very high strength subscale case was started. Author