A Damage Detection Technique of Composite Laminates with Embedded FBG Sensors

摘要

In this paper, a new real-time damage detection method for composite laminates through the use of embedded FBG sensors is presented. This method monitors the ply stress states of a laminate and compares them with failure criteria. The ply stress state of each ply of the composite laminate can be obtained by embedding three FBG sensors in the laminate based on the classical lamination theory. Experimental results show that laminates experience fracture when the ply stress states are over the boundaries of failure criteria. In this method, critical damage can be detected by the ply stress state which are close to the boundary of the failure criteria.