Strain Rate, Temperature, and Humidity Influences on Strength and Moduli of a Graphite/Epoxy Composite.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
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Results of an experimental study of the influence of strain rate, temperature, and humidity on the mechanical behavior of a graphiteepoxy fiber composite are presented. Three principal strengths longitudinal, transverse, and shear and four basic moduli E1, E2, G12, and V12 of a unidirectional graphiteepoxy T3005208 composite were followed as a function of strain rate, temperature and humidity. Each test was performed at a constant tensile strain rate in an environmental chamber providing simultaneous temperature and humidity control. Prior to testing, specimens were given a moisture preconditioning treatment at 60 deg C. Values for the matrix-dominated moduli and strength were significantly influenced by both environmental and rate parameters, whereas the fiber-dominated moduli were not. However, the longitudinal strength was significantly influenced by temperature and moisture content. A qualitative explanation for these observations is presented. jg p26
- Laminates and Composite Materials
- Physical Chemistry