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Atomic Oxygen Erosion Yield Prediction for Spacecraft Polymers in Low Earth OrbitThe ability to predict the atomic oxygen erosion yield of polymers based on their chemistry and physical properties has been only partially successful because of a lack of reliable low Earth orbit (LEO) erosion yield data. Unfortunately, many of the early experiments did not utilize dehydrated mass loss measurements for erosion yield determination, and the resulting mass loss due to atomic oxygen exposure may have been compromised because samples were often not in consistent states of dehydration during the pre-flight and post-flight mass measurements. This is a particular problem for short duration mission exposures or low erosion yield materials. However, as a result of the retrieval of the Polymer Erosion and Contamination Experiment (PEACE) flown as part of the Materials International Space Station Experiment 2 (MISSE 2), the erosion yields of 38 polymers and pyrolytic graphite were accurately measured. The experiment was exposed to the LEO environment for 3.95 years from August 16, 2001 to July 30, 2005 and was successfully retrieved during a space walk on July 30, 2005 during Discovery s STS-114 Return to Flight mission. The 40 different materials tested (including Kapton H fluence witness samples) were selected specifically to represent a variety of polymers used in space as well as a wide variety of polymer chemical structures. The MISSE 2 PEACE Polymers experiment used carefully dehydrated mass measurements, as well as accurate density measurements to obtain accurate erosion yield data for high-fluence (8.43 1021 atoms/sq cm). The resulting data was used to develop an erosion yield predictive tool with a correlation coefficient of 0.895 and uncertainty of +/-6.3 10(exp -25)cu cm/atom. The predictive tool utilizes the chemical structures and physical properties of polymers to predict in-space atomic oxygen erosion yields. A predictive tool concept (September 2009 version) is presented which represents an improvement over an earlier (December 2008) version.
Document ID
20090034484
Document Type
Technical Memorandum (TM)
Authors
Banks, Bruce A. (Alphaport, Inc. Cleveland, OH, United States)
Backus, Jane A. (Ohio Aerospace Inst. Brook Park, OH, United States)
Manno, Michael V. (Alphaport, Inc. Cleveland, OH, United States)
Waters, Deborah L. (ASRC Aerospace Corp. Cleveland, OH, United States)
Cameron, Kevin C. (Ohio Aerospace Inst. Brook Park, OH, United States)
deGroh, Kim K. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
September 1, 2009
Subject Category
Inorganic, Organic and Physical Chemistry
Report/Patent Number
NASA/TM-2009-215812
E-17074
Meeting Information
11th International Symposium on Materials in a Space Environment (ISMSE)(Aix en Provence)
Funding Number(s)
WBS: WBS 825080.04.02.30.17
Distribution Limits
Public
Copyright
Public Use Permitted.

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