Humidity Effects on the Creep Behavior of an Epoxy-Graphite Composite
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Abstract
An exploratory investigation of humidity effects on the mechanical behavior of a unidirectional epoxygraphite composite laminate is carried out by means of tensile creep tests. The test specimens are made from 8ply unidirectional prepreg tape, consisting of Modmor-II graphite fibers and epoxy resin 1004. These specimens are first dried and then exposed stress-free, in a prescribed humidity-temperature environment for a 24-hr preconditioning. In order to examine the effects of humidity on matrix-domina ted composite property, the creep load is applied normal to the fibers. A significant degradation in the matrix-dominant creep property is found as a result of a short-term humidity exposure. The effect is similar to that caused by temperature when humidity is held constant. Early creep rupture of the specimen under combined high temperature and humidity also was observed. It is shown that humidity effect on the matrix-dominant creep behavior may be described quantitatively by a time-humidity-temperature shift procedure when a certain creep-time limit is imposed.
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