Abstract
This paper details some significant findings on the use of the fiber Bragg grating (FBG) sensors for structural health monitoring (SHM) in aerospace fiber reinforced polymer (FRP) structures. A diminutive sensor provides a capability of imbedding inside FRP structures to monitor vital locations of damage. Some practical problems associated with the implementation of FBG based SHM systems in the aerospace FRP structures such as the difficulty of embedding FBG sensors during the manufacturing process and interrelation of distortion to FBG spectra due to internal damage, and other independent effects will be thoroughly studied. An innovative method to interpret FBG signals for identifying damage inside the structures will also be discussed.
Highlights
Fiber reinforced polymer (FRP) composites have been used as an engineering material for more than six decades
This paper details some significant findings on the use of the fiber Bragg grating (FBG) sensors for structural health monitoring (SHM) in aerospace fiber reinforced polymer (FRP) structures
Since the research and development (R&D) in the aircraft industry and space exploration agencies have been focused on the FRP for many years, most of the advanced fiber composites available today one way or another have their origins in these fields
Summary
Fiber reinforced polymer (FRP) composites have been used as an engineering material for more than six decades. Since the research and development (R&D) in the aircraft industry and space exploration agencies have been focused on the FRP for many years, most of the advanced fiber composites available today one way or another have their origins in these fields. The main disadvantages of using FRP composites in the aircraft industry are their difficulty for repair, anisotropic behavior, degradation of strength with time, high initial setup cost, and most importantly the complex failure. Because of these undesirable properties, the FRP composite structures in the aircraft need to be closely monitored to prevent unexpected failure. These structures can include stress-concentrated regions such as pin-loaded holes and other cutouts. In view of aforementioned issues, the structural health monitoring (SHM) technique has recently been developed for these composite structures [4, 5]
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