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

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Summary

1.Introduction

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]

SHM for FRP aerospace structures
Use of FBG sensors for SHM in aerospace structures
Embedded FBG sensors
Embedding process
30 Distorted peak during curing
Loading effect of the FBG sensor
FBG interrogation
Self distortion of the FBG sensor
Reading FBG response and identification of damage
Processing FBG data
Fixed FBG filter decoding system
Conclusions
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