NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Characteristics of Elastomer Seals Exposed to Space EnvironmentsA universal docking and berthing system is being developed by the National Aeronautics and Space Administration (NASA) to support all future space exploration missions to low-Earth orbit (LEO), to the Moon, and to Mars. The Low Impact Docking System (LIDS) is being designed to operate using a seal-on-seal configuration in numerous space environments, each having unique exposures to temperature, solar radiation, reactive elements, debris, and mission duration. As the LIDS seal is likely to be manufactured from an elastomeric material, performance evaluation of elastomers after exposure to atomic oxygen (AO) and ultraviolet radiation (UV) was conducted, of which the work presented herein was a part. Each of the three candidate silicone elastomer compounds investigated, including Esterline ELA-SA-401, and Parker Hannifin S0383-70 and S0899-50, was characterized as a low outgassing compound, per ASTM E595, having percent total mass loss (TML) less than 1.0 percent and collected volatile condensable materials (CVCM) less than 0.1 percent. Each compound was compatible with the LIDS operating environment of -50 to 50 C. The seal characteristics presented include compression set, elastomer-to-elastomer adhesion, and o-ring leakage rate. The ELA-SA-401 compound had the lowest variation in compression set with temperature. The S0383-70 compound exhibited the lowest compression set after exposure to AO and UV. The adhesion for all of the compounds was significantly reduced after exposure to AO and was further decreased after exposure to AO and UV. The leakage rates of o-ring specimens showed modest increases after exposure to AO. The leakage rates after exposure to AO and UV were increased by factors of up to 600 when compared to specimens in the as-received condition.
Document ID
20080012742
Document Type
Technical Memorandum (TM)
Authors
Daniels, Christopher C. (Akron Univ. Akron, OH, United States)
deGroh, Henry, III (NASA Glenn Research Center Cleveland, OH, United States)
Dunlap, Patrick H., Jr. (NASA Glenn Research Center Cleveland, OH, United States)
Finkbeiner, Joshua R. (NASA Glenn Research Center Cleveland, OH, United States)
Steinetz, Bruce M. (NASA Glenn Research Center Cleveland, OH, United States)
Bastrzyk, Marta B. (Illinois Inst. of Tech. Chicago, IL, United States)
Oswald, Jay J. (J and J Technical Solutions, Inc. Middleburg Heights, OH, United States)
Banks, Bruce A. (NASA Glenn Research Center Cleveland, OH, United States)
Dever, Joyce A. (NASA Glenn Research Center Cleveland, OH, United States)
Miller, Sharon K. (NASA Glenn Research Center Cleveland, OH, United States)
Waters, Deborah L. (ASRC Aerospace Corp. Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2008
Subject Category
Mechanical Engineering
Report/Patent Number
E-16189
NASA/TM-2008-215005
AIAA Paper-2007-5741
Meeting Information
43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit(Cincinnati, OH)
Funding Number(s)
WBS: WBS 644423.06.31.04.01.03.22
Distribution Limits
Public
Copyright
Public Use Permitted.

Available Downloads

NameType 20080012742.pdf STI