Accession Number : ADA302561

Title :   Fillers for Improved Graphite Fiber Retention by Polymer Matrix Composites.

Descriptive Note : Contract rept.,

Corporate Author : BOEING AEROSPACE CO SEATTLE WA ENGINEERING TECHNOLOGY ORGANIZATION

Personal Author(s) : House, E. E. ; Sheppard, C. H.

PDF Url : ADA302561

Report Date : 23 SEP 1981

Pagination or Media Count : 78

Abstract : This report describes the results of a program to determine the extent to which the addition of elemental boron and boron-containing fillers to the matrix resin prevented the release of graphite fibers from resin matrix composites exposed to fire and impact conditions. The conditions evaluated were laboratory simulations of those that could exist in the event of an aircraft crash and burn situation. The baseline (i.e., unfilled) laminates evaluated were prepared from commercially available graphite/ epoxy. The baseline and filled laminates' mechanical properties, before and after isothermal and humidity aging, also were compared. It was found that a small amount of graphite fiber was released from the baseline graphite/epoxy laminates during the burn and impact conditions used in this program. However, the extent to which the fibers were released is not considered a severe enough problem to preclude the use of graphite-reinforced composites in civil aircraft structures. It also was found that the boron and boron-containing filler concepts eliminated this fiber release. Isothermal and humidity aging did not appear to alter the fiber release tendencies. jg p.10

Descriptors :   *POLYMERS, *MATRIX MATERIALS, *RETENTION(GENERAL), *BORON, *GRAPHITE EPOXY COMPOSITES, *FILLERS, SIMULATION, FIBERS, MECHANICAL PROPERTIES, AIRCRAFT, IMPACT, AGING(MATERIALS), COMPOSITE MATERIALS, LAMINATES, CARBON FIBERS, COMBUSTION, BASE LINES, EPOXY LAMINATES, AIRFRAMES, RELEASE, LABORATORY PROCEDURES, FIRES, GRAPHITED MATERIALS, PLASTICS, CARBON REINFORCED COMPOSITES, ISOTHERMS, HUMIDITY, CRASHES.

Subject Categories : Polymer Chemistry
      Aircraft
      Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE