High-temperature aging, and associated microstructural and property changes in carbon-fiber reinforced polyimide composites

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:89903

Skontorp, A; Wang, S S ^[1]

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1. Univ. of Houston, TX (United States). Dept. of Mechanical Engineering

A study of high-temperature oxidation and aging is conducted on two carbon-fiber reinforced polyimide-matrix composites, PMR-15/G30-500 and Avimid-N/IM6. Also, the effects of long-term aging and oxidation on material microstructural changes and mechanical properties are investigated. Concurrent with the thermal aging of the composites, high-temperature creep experiments are conducted to study the coupling and the interplay among aging, oxidation and thermomechanical deformations. Emphases are placed on the aging and oxidation of the matrix and the fiber-matrix interface. Matrix-dominated effective thermomechanical properties are found to be significantly affected by the high-temperature environment. The accompanying volumetric changes in the composites have a severe impact on the long-term transverse creep behavior at elevated temperatures. The high-temperature-induced aging strains are found to be independent of the applied mechanical load up to 50% of the initial ultimate tensile strength at the same temperature. The high-temperature mechanical creep deformations are, likewise, found to be linear in stress at least up to this limit.

• OSTI ID: 89903
• Report Number(s): CONF-9409291--; ISBN 1-56676-220-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
CARBON FIBERS
COMPOSITE MATERIALS
CRACKS
CREEP
IMIDES
INTERFACES
MECHANICAL PROPERTIES
MICROSTRUCTURE
OPTICAL MICROSCOPY
OXIDATION
POLYMERS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES