ISSN: 0884-6804
Page Count: 10

Time-Dependent Behavior of a Graphite/Thermoplastic Composite and the Effects of Stress and Physical Aging
Feldman, M
Old Dominion University, VA

Gates, TS
Research scientist, NASA Langley Research Center, VA

Abstract

Experimental studies were performed to determine the effects of stress and physical aging on the matrix dominated time-dependent properties of IM7/8320 composite. Isothermal tensile creep/aging test techniques developed for polymers were adapted for testing of the composite material. Time-dependent transverse (S²²) and shear (S⁶⁶) compliance's for an orthotropic plate were found from short-term creep compliance measurements at constant, sub-Tg temperatures. These compliance terms were shown to be affected by physical aging. Aging time shift factors and shift rates were found to be a function of temperature and applied stress.

Keywords:
physical aging, composite materials, viscoelasticity, creep compliance, superposition

Paper ID: CTR10511J
DOI: 10.1520/CTR10511J
ASTM International is a member of CrossRef.