Mechanical Properties of Fibre-Reinforced Composites Tested under Superposed Hydrostatic Pressures
ROYAL ARMAMENT RESEARCH AND DEVELOPMENTESTABLISHMENT FORT HALSTEAD (UNITED KINGDOM)
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In glass or carbon fiberresin composites theoretical tensile strengths are rarely realized good composites produced by reproducible conventional techniques attain about 60 of the theoretically predicted values, sigma sub th. In an attempt to improve the tensile properties 54 V sub f carbon and 60 V sub f glass fiberepoxy resin rods were manufactured by pultrusion and values of about 80 sigma sub th were obtained. Although the fibers are continuous, these properties suggest that perhaps an effective discontinuous fiber length is an important composite parameter. Results of tests on resin and carbon fiber composite specimens under superposed hydrostatic pressures indicate the critical property to be the resin shear failure stress. 53 V sub f carbon fibernickel composites were prepared by the RARDE technique of plating and hot compaction. Tests under superposed hydrostatic pressures indicate the critical stage in the failure process to be the tensile failure of the fibers, in contrast to the shear-operated failure mechanism in the resin composite.
- Laminates and Composite Materials