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Monte Carlo Computational Modeling of the Energy Dependence of Atomic Oxygen Undercutting of Protected PolymersA Monte Carlo computational model has been developed which simulates atomic oxygen attack of protected polymers at defect sites in the protective coatings. The parameters defining how atomic oxygen interacts with polymers and protective coatings as well as the scattering processes which occur have been optimized to replicate experimental results observed from protected polyimide Kapton on the Long Duration Exposure Facility (LDEF) mission. Computational prediction of atomic oxygen undercutting at defect sites in protective coatings for various arrival energies was investigated. The atomic oxygen undercutting energy dependence predictions enable one to predict mass loss that would occur in low Earth orbit, based on lower energy ground laboratory atomic oxygen beam systems. Results of computational model prediction of undercut cavity size as a function of energy and defect size will be presented to provide insight into expected in-space mass loss of protected polymers with protective coating defects based on lower energy ground laboratory testing.
Document ID
19980197294
Document Type
Reprint (Version printed in journal)
Authors
Banks, Bruce A. (NASA Lewis Research Center Cleveland, OH United States)
Stueber, Thomas J. (NYMA, Inc. Brook Park, OH United States)
Norris, Mary Jo (Cleveland State Univ. Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1998
Subject Category
Nonmetallic Materials
Report/Patent Number
E-11181
NAS 1.15:207423
NASA/TM-1998-207423
Meeting Information
Protection of Materials and Structures from the LEO Space Environment(Toronto)
Funding Number(s)
PROJECT: RTOP 632-1A-1E
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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