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High-Temperature Knitted Spring Tubes Improved for Structural Seal ApplicationsTo meet the needs of current and future space vehicles, the NASA Glenn Research Center is developing advanced control surface seals. These seals are used to fill the gaps surrounding actuated structures, such as rudders and body flaps, to shield underlying lower temperature structures, such as mechanical actuators, from the hot gases encountered during atmospheric reentry. During previous testing, the current baseline seal design, which is used on the space shuttle as a thermal barrier and was selected as the rudder-fin seal on the X-38 crew return vehicle, exhibited significant permanent set following compression at 1900 F (see the following photograph). Decreased resiliency (springback) could prevent the seal from contacting both of the opposing sealing surfaces and allow the ingestion of damaging hot gases during reentry, which could have detrimental effects on vehicle subsystems.
Document ID
Document Type
Dunlap, Patrick H.
(NASA Glenn Research Center Cleveland, OH, United States)
Steinetz, Bruce M.
(NASA Glenn Research Center Cleveland, OH, United States)
DeMange, Jeffrey J.
(Toledo Univ. OH, United States)
Taylor, Shawn C.
(Case Western Reserve Univ. OH, United States)
Date Acquired
September 7, 2013
Publication Date
June 1, 2005
Publication Information
Publication: Research and Technology 2004
Subject Category
Spacecraft Design, Testing And Performance
Distribution Limits
Work of the US Gov. Public Use Permitted.
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