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FLEXURAL FATIGUE BEHAVIOR OF UNIDIRECTIONAL GLASS FIBER/EPOXY COMPOSITES: NUMBER OF PLIES EFFECT
Last modified: 2015-12-07
Abstract
Flexural fatigue tests have been conducted on three unidirectional glass fiber
(UGF)/epoxy composites of same thickness (6mm) with different number of plies and
constant overall fiber volume fraction, 39.9 %. Fatigue tests were performed at zero mean
stress. Residual stiffness degradation was continuously monitored during testing and
20% reduction of the stiffness was taken as a failure criterion. The number of plies effect
on both the S–N curves and surface temperature of the fabricated composites has been
studied. Test data were statistically analyzed using two-parameter Weibull distribution. SN
curves at specific failure probability levels were established. They are of considerable
value to the designers.
(UGF)/epoxy composites of same thickness (6mm) with different number of plies and
constant overall fiber volume fraction, 39.9 %. Fatigue tests were performed at zero mean
stress. Residual stiffness degradation was continuously monitored during testing and
20% reduction of the stiffness was taken as a failure criterion. The number of plies effect
on both the S–N curves and surface temperature of the fabricated composites has been
studied. Test data were statistically analyzed using two-parameter Weibull distribution. SN
curves at specific failure probability levels were established. They are of considerable
value to the designers.
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