JMS_V5_N2_RevP2 Shankara D.R. Kiran Kumar P. Journal on Material Science 2347–615X 5 2 47 53 Polymer Composites, Fatigue Test, Fatigue Behavior, Fatigue Characteristic The fiber - reinforced polymer composites are normally exposable to fatigue behavior, fatigue properties, and fatigue failure. Increasing stress ratios can lead to better fatigue performance in fiber - reinforced polymer composites. The images from SEM (Scanning Electron Microscope) expose that under a high level of stress, the critical fiber breaking failure, which is the dominant damage, occurs along with matrix cracking and interfacial debonding. The experimental indication is supported by microscopic assessment at different stages of the fatigue life and fracture surface investigations. This paper reviews the fatigue behavior and characteristics of fiber - reinforced polymer composites. To predict the fatigue life of fiber - reinforced polymer composites not only the effects of a load, but other experimental input variables, such as maximum stress, fiber orientation, and stress ratio were also considered. The output variables were the number of cycles to failure stress ratios and load frequencies which are also reviewed in this paper. July – September 2017 Copyright © 2017 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=13660