Feature-guided wave-based health monitoring of bent plates using fiber Bragg gratings

Abstract

Harnessing of ultrasonic guided waves confined in local features such as bends and welds, known as feature-guided waves, has emerged as a promising technique for non-destructive testing and structural health monitoring of industrial and aerospace structures. This article introduces a fiber Bragg grating based technique which uses feature-guided waves to detect anomalies or defects in plate structures with transverse bends. We are able to obtain good consistency between simulation and experimental results, both in the case of defect-free bent plates and those with transverse defects. Such results establish fiber Bragg gratings as a viable alternative to conventional techniques for structural health monitoring of bent plates.

Outlier analysis for defect detection using sparse sampling in guided wave structural health monitoring

“…Structural health monitoring (SHM) of transportation and infrastructural assets such as aircraft, bridges, tank floors, and ship hulls is vital for minimizing catastrophic failures 1‐5 . Ultrasonic guided waves are attractive for monitoring such large scale and complex structures 6‐8 .…”

Ultrasonic Structural Health Monitoring Using Fiber Bragg Grating

“…FBG can be used in acousto-ultrasonic detection to sense an ultrasonic Lamb wave that propagates in an isotropic Perspex plate [ 25 ], isotropic metal plate [ 29 ], bent plate [ 114 ], anisotropic CFRP laminate [ 115 ], or glass fiber reinforced plastic laminate [ 116 ]. The FBG sensor can be demodulated by a broadband light source or a laser light source [ 117 ].…”

Damage detection in quasi-isotropic composite bends using ultrasonic feature guided waves

“…Ultrasonic guided wave testing can be an effective alternative since it potentially allows for rapid screening of large areas with a fixed transducer position and remote inspection of structures with difficult access. In recent years, one particular branch of guided waves confined to local structural variation -feature guided waves (FGW) have received much attention and been discussed in the literature extensively [5,6,7,8,9,10,11,12,13,14,15]. Guided waves not only exists in the regular waveguides (e.g.…”