Stress modeling of pipelines strengthened with advanced composites materials

Fiber reinforced polymer composites (FRPC) have established a strong position as an effective mean for the repair and rehabilitation of infrastructure. However, the use of FRP in the repair and rehabilitation of pipelines is a new concept that has the potential to improve the way we repair pipelines. The purpose of this paper is to discuss the benefits of using FRPC and to provide stress expressions on the interaction between the different stresses exerted on pipe walls and the effects of FRPC sheets on the circumferential stresses of damaged pipe walls. The effects of three different FRPC sheets: Glass FRP (GFRP), Aramid FRP (AFRP), and Carbon FRP (CFRP) on the performance of pipe walls will be compared analytically. Results show that carbon fiber composites perform better than glass or aramid in improving the ultimate internal pressure capacity of pipes, and therefore, significantly enhance the strength, durability, and corrosive properties.