Determination of fatigue life of the unidirectional GFRP/Al hybridcomposite laminates

This paper investigates the effects of loading rate andfiber orientation on the fatigue behavior of the uni-directional glass-fiber reinforced-plastic/aluminum (GFRP/Al) hybrid laminated (GLARE-2) plates. Fatigue testswere performed at three kinds of stress ratios (R = 0.3, 0.1, and−0.1) on specimens with differentfiber or-ientations,θ= 0°, 15°, 30°, 45°, 60°, 75°, and 90°, in the GFRP layers. All the fatigue results to be presented inthis article were obtained in repeated tension-tension and tension-compression at stress ratios of 0.3, 0.1, and−0.1, and the results were compared with each other. It has been shown that the specimens have the highestfatigue life in thefiber orientation direction at R = 0.3 loading rate. Also, it has been shown that the fatigue lifeof the specimens decreases as the loading rate decreases.