Accession Number:

AD0269056

Title:

FIBERGLASS MOTOR CASE STUDY. POLARIS SECOND STAGE END CLOSURE

Descriptive Note:

Corporate Author:

KIDDE (WALTER) AND CO INC BELLEVILLE N J

Personal Author(s):

Report Date:

1961-12-12

Pagination or Media Count:

3.0

Abstract:

Investigations were made to prepare hardware and determine deflection and stress characteristics on the scale model Polaris rocket case configuration. The fabrication is described of the hydrostatic test rig for the 14 scale Polaris case. Fabrication and testing of the initial 14 scale model Polaris case is also described. The case was checked at 40 psig and then brought up to the proof pressure of 390 psig at a rate of 150 psig per minute and remained at this pressure for one minute. The pressure was then reduced to 50 psig to permit removal of several dial indicators which would be damaged during the subsequent burst test. The case was then repressurized at approximately 42 psig per second until burst occurred at 590 psig. The failure occurred at the dome skirt juncture and extended about 220 degrees around the circumference. Preliminary calculations show the composite hoop wall stress in the cylinder based on wall thickness at failure was 127,000 psi yielding a hoop and longitudinal glass loading of 6.3 lbend and 618 lbend, respectively. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE