Effect of MWCNTs on Fatigue Life of Woven Glass Fiber Reinforced Polymers
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Abstract
Tension-tension fatigue performance of GFRP woven laminates of orientation (0/90)12 has been examined with inclusion of MWCNTs at 0.5 wt. %. Fatigue tests were executed for neat and MWCNTs modified GFRP at three stress levels for 75%, 65% and 55% of ultimate tensile strength under stress ratio, R=0.1 and R=0.3. Fatigue behaviour was evaluated based on S-N curves, FSC and FSE. Under constant amplitude cyclic loading, fatigue life of nanotubes modified GFRP specimens remained higher when compared to neat GFRP specimens at all stress levels. Furthermore, it is found that the fatigue life of neat and modified GFRP were reliant on stress level and stress ratio. In addition, analytical models have been employed to predict fatigue life, demonstrating consistency with experimental fatigue life. Moreover, design life has been evaluated at several dependability levels by the application of the Weibull distribution.
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