Mechanical properties of unidirectional and fabric graphite/epoxy composites

Technical Report · Sun Jun 01 04:00:00 EDT 1986

OSTI ID:5633527

Guess, T R

Room-temperature tension, compression, flexural, short beam shear, and inplane shear test results are presented for unidirectional and fabric reinforced graphite/epoxy composites. The reinforcement was 34 million psi modulus graphite fibers: Celion 12K in a unidirectional material and Thornel 300 in a fabric composite of 24 x 23 ends/inch eight-harness satin weave fabric. Both composites used a 350/sup 0/F epoxy resin, CE-9000, for the matrix material. The elastic and strength properties of the unidirectional specimens were in good agreement with analytical predictions and with literature values for similar materials. The tensile stress-strain curves of the unidirectional and fabric composites were linear elastic to failure; whereas, the compression curves exhibited some nonlinearity near failure. A slight degree of anisotropy (less than 5%) was observed between the properties in the warp and fill directions of a fabric composite in which the individual plies of fabric were warp aligned. This anisotropy is attributed to the fact that there is about 4% more fiber reinforcement in the warp direction than in the fill direction of the fabric.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5633527
• Report Number(s): SAND-86-0784; ON: DE86012077
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360303* -- Composite Materials-- Mechanical Properties-- (-1987)
CARBON
COMPOSITE MATERIALS
COMPRESSION STRENGTH
ELEMENTAL MINERALS
ELEMENTS
EPOXIDES
FLEXURAL STRENGTH
GRAPHITE
MATERIALS
MECHANICAL PROPERTIES
MINERALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
REINFORCED MATERIALS
SHEAR
TENSILE PROPERTIES