The effect of physical aging on the creep response of a thermoplastic composite

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

OSTI ID:5398342

Hastie, Jr, R L

The effect of thermoreversible physical aging on the linear viscoelastic creep properties of a thermoplastic composite was investigated. Radel X/IM7, an amorphous composite material considered for use in the next generation high-speed transport aircraft, was studied. The operating environment for the aircraft material will be near 188C with a service life in excess of 60,000 hours at temperature. Accurate predictions of the viscoelastic properties of the material are essential to insure that design strength and stiffness requirements are met for the entire service life. The effect of physical aging on the creep response was studied using momentary tensile creep tests conducted at increasing aging times following a rapid quench from above to below the glass transition temperature. As the aging time increased, the creep response of the material significantly decreased. The tensile creep compliance data for each aging time were fit to an empirical equation. The effect of physical aging becomes more apparent during long-term tests with creep and aging occur simultaneously. This results in a gradual stiffening and decrease in the creep response with increased time.

• Research Organization: Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States)
• OSTI ID: 5398342
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
AGING
COMPOSITE MATERIALS
CREEP
MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
QUENCHING
SYNTHETIC MATERIALS
THERMOPLASTICS
TIME DEPENDENCE