Effect Of Temperature And Gap Opening Rate On The Resiliency Of Candidate Solid Rocket Booster O Ring Materials

Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781792687648
Total Pages : 34 pages
Book Rating : 4.6/5 (876 download)

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Download or read book Effect of Temperature and Gap Opening Rate on the Resiliency of Candidate Solid Rocket Booster O-Ring Materials written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the redesign of the Space Shuttle solid rocket motor following the Challenger accident, the field and nozzle-to-case joints were designed to minimize gap opening caused by internal motor pressurization during ignition. The O-ring seals and glands for these joints were designed both to accommodate structural deflections and to promote pressure assisted sealing. The resiliency behavior of several candidate O-ring materials was evaluated for the effects of temperature and gap opening rates. The performance of three of the elastomeric materials was tested under the specific redesign gap opening requirement. Dynamic flexure conditions unique to launch produce low frequency vibrations in the gap opening. The effect of these vibrations on the ability of the O-ring to maintain contact with the sealing surface was addressed. The resiliency of the O-ring materials was found to be extremely sensitive to variations in temperature and gap opening rate. The top three elastomeric materials tracked the simulated solid rocket booster (SRB) field joint deflection at 75 and 120 F. The external tank/SRB attach strut load vibrations had a negligible effect on the ability of the O-ring to track the simulated SRB field joint deflection. Lach, Cynthia L. Langley Research Center NASA-TP-3226, L-17023, NAS 1.60:3226 RTOP 505-63-50-03...