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Cyclic tests of P-bulb end-seal designs for a shuttle-type wing-elevon cove membrane sealFour P-bulb end seal designs were tested at room temperature in a cyclic seal test apparatus. Test results show that all the P-bulb end seals have the durability required for a 100 mission life (neglecting possible elevated-temperature effects) and three of the four P-bulbs provide an adequate seal against a 7.0-kPa air pressure differential. Antifriction material attached to the P-bulb rub surface reduced friction slightly but could degrade the sealing effectiveness. A flat rub surface molded into the P-bulb discouraged wrinkling and rolling and thereby reduced leakage. However, the P-bulbs lacked resilience, as indicated by increased leakage when P-bulb compression was reduced. The best P-bulb design tested included an antifriction interface bonded to a flat surface molded into the P-bulb.
Document ID
19790020050
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Hunt, L. R.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1979
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
L-12958
NASA-TM-80093
Accession Number
79N28221
Funding Number(s)
PROJECT: RTOP 506-17-43-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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