Abstract
An experimental study was conducted to evaluate the hygrothermal effects on the rigid polymer foam core sandwich composites at a given temperature and humidity conditions. Fabrication of the poly-urethane or poly iso-cyanurate core based, glass/ epoxy face sheet based sandwich composites of 65 Kg/m3 and 251 Kg/m3 foam densities by hand layup followed by vacuum bagging technique, are discussed. The panels were sliced and honed according to the required dimensions for a span to depth ratio of 16:1. The specimens were then maintained at 40°C and 90% relative humidity conditions in a hygrothermal chamber for days till saturation equillibrium. Three-point bending tests were performed for hygrothermally saturated specimens and unconditioned specimens. Finally, a comparison of the test results of the saturated and unconditioned specimens was made. The moisture saturated specimens show lower strength and stiffness than unconditioned specimens, in addition to a few more results. A discussion is provided on the absorption models for moisture at elevated temperatures and their influence on the property degradation.
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