Experimental Study of the Effect of Fiber Orientationson Tensile Properties and Impact Strength of Unidirectional Fibers /Epoxy Composites

Abstract

This study investigates the effect of fiber orientations on mechanical properties such as young modulus, yield stress, ultimate stress, and impact strength of unidirectional glass fiber/epoxy composites and unidirectional carbon fiber/ epoxy composites. The volume fraction of fiber is 30% and different orientations (0°, 30°, 45°, 60°, and 90°) are considered. The samples have been prepared by hand lay-up method, vacuum chamber at room temperature. The test samples were prepared and tested according to ASTM standards. The experimental results show that the young modulus, yield stress, ultimate stress, and impact strength of unidirectional glass/epoxy and unidirectional carbon/epoxy are maximum at 0° orientation while young modulus, yield stress, ultimate stress, and impact strength decreases with increasing the angle orientation of fibers.