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Theoretical studies of radiation effects in composite materials for space useTetraglycidyl 4,4'-diamino diphenyl methane epoxy cured with diamino diphenyl sulfone was used as a model compound. Computer programs were developed to calculate (1) energy deposition coefficients of protons and electrons of various energies at different depths of the material; (2) ranges of protons and electrons of various energies in the material; and (3) cumulative doses received by the composite in different geometric shapes placed in orbits of various altitudes and inclination. A preliminary study on accelerated testing was conducted and it was found that an elliptical equitorial orbit of 300 km perigee by 2750 km apogee can accumulate, in 2 years or less, enough radiation dose comparable to geosynchronous environment for 30 years. The local plasma model calculated the mean excitation energies for covalent and ionic compounds. Longitudinal and lateral distributions of excited species by electron and proton impact as well as the probability of overlapping of two tracks due to two charged particles within various time intervals were studied.
Document ID
Document Type
Contractor Report (CR)
Chang, C. K.
(Christopher Newport Coll. Newport News, VA, United States)
Kamaratos, E.
(Christopher Newport Coll. Newport News, VA, United States)
Date Acquired
September 4, 2013
Publication Date
September 1, 1982
Publication Information
Publisher: NASA
Subject Category
Space Radiation
Report/Patent Number
NAS 1.26:3618
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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