Accession Number:

ADA148290

Title:

Disclinations in Carbon-Carbon Composites.

Descriptive Note:

Annual rept. no. 3, Jul 83-Jul 84,

Corporate Author:

ACUREX CORP/AEROTHERM MOUNTAIN VIEW CA

Personal Author(s):

Report Date:

1984-09-01

Pagination or Media Count:

80.0

Abstract:

The carbonaceous mesophase is the discotic nematic liquid formed during the pyrolysis of the petroleum and coal-tar pitch precursors for the matrix of carbon-carbon composites. The disklike, aromatic molecules of the mesophase are diamagnetic and can be oriented by a magnetic field. This research has involved the study of the effect of a magnetic field on the alignment of the carbonaceous mesophase by itself as matrix between fiber bundles, within fiber bundles, and within a bidirectional fiber composite. The pyrolysis of a bidirectional fiber composite in the presence of the magnetic field has shown that the matrix between the fiber bundles can be oriented perpendicular to the graphite-fiber fabric plies when the magnetic field direction is perpendicular to the fabric plies. This oriented matrix should provide improved resistance to interlaminar shear fracture.

Subject Categories:

  • Laminates and Composite Materials
  • Electricity and Magnetism
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE