The effect of carbon nanotubes on the life of drilled glass / epoxy composite under fatigue loading

Nowadays fiber reinforcement composite are highly regarded, because of their proper mechanical properties and low weight. One of their main ways to assemble is drilling. Drilling causes to many failures such as: delamination, hole shrinkage, fibers pull-out and thermal failures. These failures reduce composite strength specially in fatigue loading. Using of carbon Nano tubes improve mechanical properties such as: hardness, strength, young module and stiffness. This investigation focuses on effect of added carbon Nano tubes Wt% on lifetime of glass/epoxy laminated composites under tensile - tensile fatigue loading. To main this purpose specimens whit different carbon Nano tubes Wt% have been made. They have been drilled by same condition. Then these specimens were subjected to tensile - tensile fatigue loading. AE sensors and microscopic camera were used to validate results. The results indicate that carbon Nano tubes Wt% increase, increase specimens fatigue life.