Assessment of beneficial effects of interference-fit in pin-loaded FRP composites

Interference-fit pin connections have wide applications ranging from aerospace structures to electric hardware systems and the telephone industry. In order to derive the maximum benefit by the use of interference-fit pin in all such applications, a complete understanding of their behavior in the regions of joints is essential. This paper deals with the study of various beneficial effects of interference-fit pin-loaded FRP composite laminates. Three-dimensional finite element models have been created to simulate interference-fit pin-loaded joints in various composite laminates. Non-linear contact analyses have been performed to study the effects of interference for different material cases on (a) circumferential edge stresses, (b) stresses across the weakest section (i.e., net-tension plane), and (c) the out-of-plane stresses around the hole periphery. It is observed that interference with specific value for each material case and laminate configuration is beneficial for better load carrying capabilities. Suitable interference for improved performance has been evaluated and recommended for each case. It is also emphasized that by interference-fit fatigue life of the joint can be improved.