Interfacial properties control the durability of externally repaired infrastructures with composite materials

摘要

Strength of structure repaired with externally bonded FRP sheet depends on bonding strength between FRP sheets and substrate. It is important to evaluate a bonding strength between FRP sheets and substrate. Numerous researchers have noticed debond and peel during tests and have voiced concern related to this mode of failure. Further investigations into mechanisms of peel and the characteristics of the composites-substrate interface during debonding and peeling are thus critical to understanding both design requirements and long-term use potential of composite plates as a means of rehabilitation of infrastructure elements. In this study, we investigated about two topics: First is durability of a single notch beam repaired with externally bonded composite under fatigue loading, second is environmental durability of steel attached with externally bonded composite in marine environment.