Propagation of Failure in Adhesive Joints between CFRP/GFRP Beams Subjected to Cyclic Bending

Last decades were crucial for composite structures. They were highly developed and started to be widely used in aircraft industry. This allowed engineers to overcome a set of issues connected with incapability of known materials to support modern requirements and needs. Merging together two or more materials in special way enabled to save advantages of each and get rid of individual drawbacks. As a result such a "hybrid" material got improved structural properties. However, in the aircraft industry important are not only individual parameters of the material, but how it can be joined with other part. Mechanical fasteners and adhesives types of joining are used with composites materials depending on application and material composition. Even as both types are still used, adhesive bonding of composite material are more beneficial in comparison with traditional mechanical fasteners. The aim of this article is to perform fatigue test of adhesive joints between CFRP and GFRP composites and analyze obtained results. In order to do that, destructive loads levels were investigated with mathematical model and with FEM simulation in ANSYS software.