Interfacial changes during the processing of a typical carbon fiber/epoxy composite material

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:6958835

Rao, V

The effect of the processing cycle on the interfacial shear strength of a thermoset mPDA/DGEBA matrix reinforced with carbon, AS4 fibers was investigated. The processing cycle of a thermoset can be conveniently divided into three different regimes. In the fluid regime, the kinetics of crosslinking are used to determine gelation times. Gravimetric pull-out tests are conducted to relate the viscoelastic properties of the matrix to an interfacial pull-out strength. Results indicate that in the fluid regime, the interfacial strength begins to develop and increases with increasing viscosity of the reacting matrix. At ambient conditions, constant interfacial and matrix chemistry is used to systematically vary the matrix properties from ductile to brittle in order to simulate the actual processing cycle. These matrix properties are then related to the interfacial shear strength. At elevated temperatures, interfacial (single fiber) shear strength measurements confirm the reduction in interfacial shear strength with a reduction in matrix modulus.

• Research Organization: Michigan State Univ., East Lansing, MI (United States)
• OSTI ID: 6958835
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
CARBON FIBERS
COMPOSITE MATERIALS
EPOXIDES
FIBERS
INTERFACES
MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PROCESSING
SHEAR PROPERTIES
VISCOSITY