Accession Number : ADA304493

Title :   Electron and Proton Absorption Calculations for a Graphite/Epoxy Composite Model.

Descriptive Note : Technical paper,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Long, Edward R., Jr

PDF Url : ADA304493

Report Date : NOV 1979

Pagination or Media Count : 31

Abstract : The Bethe-Bloch stopping power relations for inelastic collisions have been used to determine the absorption of electron and proton energy in cured neat epoxy resin and the absorption of electron energy in a graphite/epoxy composite. Absorption of electron energy due to bremsstrahlung has also been determined. Electron energies from 0.2 to 4.0 MeV and proton energies from 0.3 to 1.75 MeV were used in this study. Monoenergetic electron energy absorption profiles for models of pure graphite, cured neat epoxy resin, and graphite/epoxy composites are reported. A relation was determined for depth of uniform energy absorption in a composite as a function of fiber volume fraction and initial electron energy. Monoenergetic proton energy absorption profiles were reported for the neat resin model. A relation for total proton penetration in the epoxy resin as a function of initial proton energy was determined. Electron energy absorption in the composite due to bremsstrahlung was reported. Electron and proton energy absorption profiles in cured neat epoxy resin were also reported for environments approximating geosynchronous Earth orbit.

Descriptors :   *GRAPHITE EPOXY COMPOSITES, *ENERGY ABSORBERS, *BREMSSTRAHLUNG, COMPUTATIONS, POLYMERS, FIBER REINFORCED COMPOSITES, ELASTIC PROPERTIES, PROTONS, ELECTRON ENERGY, PENETRATION, SPACECRAFT COMPONENTS, PARTICLE COLLISIONS, SYNCHRONOUS SATELLITES, DOSIMETRY.

Subject Categories : Nuclear Radiation Shield, Protection & Safety
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE