Interfacial Stress Field Dependence of Unidirectional Glass Fibrous Composites upon Fiber Orientations

Fiber reinforced polymer composites have emerged as an appropriate substitution to the more prevailing civil engineering materials for the creation, strengthening, rehabilitating and even retrofitting the structures. The more engineers become aware of the unique features of advanced FRP composites, the more these types of materials are utelized in reinforcing or prestressing concrete structures. One of the main issues concerning with design requirements is the high interfacial stress concentrasion near the edges of adhesively bonded composite joints which is responsible for the most dominant mode of failure, that is the debonding failure. The present investigation deals with the stress analysis of adhesively bonded single-sided simply-supported joint consisting of a concrete substrate reinforced with a layer of transversely isotropic unidirectional GFRP fibrous composite cover using a robust computational MATLAB code based on the elementary Euler-Bernoulli beam theory and calculating the total strain energy followed by applying the theorem of minimum complimentary strain energy of the joint in order to predict the entire interfacial shear and normal stress field distribution along the bonding line due to the change in fiber orientations.