Effect of long-term exposure to extreme conditions on the properties of preloaded composites in tension, compression, and shear

Autor: Zhugun, I. G., Ivonin, Yu. N., Shlitsa, R. P., Nikishin, E. F.
Zdroj: Mechanics of Composite Materials; September 1988, Vol. 23 Issue: 5 p567-572, 6p
Abstrakt: 1.Long-term exposure under extreme and room conditions did not have an appreciable effect on the elastic or strength properties of the free and constrained specimens of the investigated glass- and carbon-fiber plastics. The exception was the data for the modulus of interlaminar shear, which decreased by 13–30%.2.Glass-fiber plastics showed a sensitivity to cosmic conditions if they were first preloaded by longitudinal compressive stresses equal to 1/3 the compressive strength. After long-term exposure, the specimens exhibited a reduction in the investigated strength indices (some of the specimens failed during exposure under extreme conditions) and the modulus of interlaminar shear.3.Elastic and strength properties proved to be little sensitive to long-term exposure under extreme and room conditions for glass- and carbon-fiber specimens preloaded by longitudinal tensile stresses initially equal to 0.31–0.35 of the tensile strength.
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