Accession Number : ADA310388

Title :   The Effects of Simulated Space Environmental Parameters on Six Commercially Available Composite Materials.

Descriptive Note : Technical paper,

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

Personal Author(s) : Funk, Jean G. ; Sykes, George F., Jr

PDF Url : ADA310388

Report Date : APR 1989

Pagination or Media Count : 35

Abstract : The effects of simulated space environmental parameters on microdamage induced by the environment in a series of commercially available graphite fiber reinforced composite materials were determined. Composites with both thermoset and thermoplastic resin systems were studied. Low-Earth-orbit (LEO) exposures were simulated by thermal cycling; geosynchronous orbit (GEO) exposures were simulated by electron irradiation plus thermal cycling. The thermal cycling temperature range was -250 deg F to either 200 deg F or 150 deg F. The upper limits of the thermal cycles were different to ensure that an individual composite material was not cycled above its glass transition temperature. Material response was characterized through assessment of the induced microcracking and its influence on mechanical property changes at both room temperature and -250 deg F. Microdamage was induced in both thermoset and thermoplastic advanced composite materials exposed to the simulated LEO environment. However a 350 deg F-cure single phase toughened epoxy composite was not damaged during exposure to the LEO environment. The simulated CEO environment produced microdamage in all materials tested.

Descriptors :   *MECHANICAL PROPERTIES, *SPACE ENVIRONMENTS, *FIBER REINFORCED COMPOSITES, *THERMAL CYCLING TESTS, THERMAL PROPERTIES, LOW ORBIT TRAJECTORIES, DAMAGE ASSESSMENT, STRUCTURAL RESPONSE, HEATING, THERMOPLASTIC RESINS, RANGE(EXTREMES), EPOXY COMPOSITES, SYNCHRONOUS SATELLITES, MICROCRACKING.

Subject Categories : Mechanics
      Laminates and Composite Materials
      Astronautics

Distribution Statement : APPROVED FOR PUBLIC RELEASE