REINFORCED PLASTIC CONSTRUCTION METHODS FOR LARGE ROCKET MOTOR CASE. VOLUME III. TU-228 CASE DESIGN AND FABRICATION.
Final technical engineering rept. 5 Mar 61-15 Mar 63,
THIOKOL CHEMICAL CORP BRIGHAM CITY UTAH
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From specifications and drawings, the case design and fabrication processes were established for a modular construction of fiberglass plastic cases. These cases were designed and fabricated to develop manufacturing methods for large 65 in. diameter or larger plastic rocket motor cases. Cases design included derivation of dome contours analysis of dome, case cylinder, and skirt stresses determination of component weights and specification of glass filament size, resin system, case liner material, hardware, and case mandrels. Winding patterns and wrapping angles were evaluated by computer program for specific applications. Two small cases and one large case were fabricated and subjected to hydroburst testing. The design feasibility and fabrication techniques were successfully proven in subscale tests, in which the cases burst at 143 and 162 percent of the design ultimate pressure. While the larger case burst below design limit proof pressure 840 psi burst 890 psi design, sufficient data, recorded from case behavior under pressure and from analysis of the mode of failure, permitted complete evaluation of the modular design. The stiffness of larger modules introduces deviations which effect case strength and performance under test. Author