scholarly journals Post-Impact Fatigue Damage Monitoring Using Fiber Bragg Grating Sensors

Sensors ◽  
2014 ◽  
Vol 14 (3) ◽  
pp. 4144-4153 ◽  
Author(s):  
Chow-Shing Shin ◽  
Shien-Kuei Liaw ◽  
Shi-Wei Yang
Keyword(s):  
Fiber Bragg Grating ◽  
Fatigue Damage ◽  
Bragg Grating ◽  
Impact Fatigue ◽  
Fiber Bragg Grating Sensors ◽  
Damage Monitoring ◽  
Post Impact

Strain and damage monitoring in solar-powered aircraft composite wing using fiber Bragg grating sensors

2013 ◽  
Author(s):  
Dae-Hyun Kim ◽  
Kun-Ho Lee ◽  
Byung-Jun Ahn ◽  
Jin-Hyuk Lee ◽  
Seong-Kyun Cheong ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Fiber Bragg Grating Sensors ◽  
Damage Monitoring ◽  
Solar Powered ◽  
Composite Wing

Application study on fiber Bragg grating sensors in damage monitoring of sandwich composite joints

2018 ◽  
Vol 22 (5) ◽  
pp. 1542-1563
Author(s):  
Haiyan Zeng ◽  
Renjun Yan ◽  
Lin Xu ◽  
Siyuan Gui
Keyword(s):  
Fiber Bragg Grating ◽  
Sandwich Composite ◽  
Bragg Grating ◽  
Internal Damage ◽  
Application Study ◽  
Fiber Bragg Grating Sensors ◽  
Damage Monitoring ◽  
Core Fiber ◽  
Process Measurements ◽  
Failure Location

This article studies the application of fiber Bragg grating sensors in damage monitoring of sandwich composite L-joints, which aims to reveal the interface damage between the GFRP skin and the foam core. Fiber Bragg grating sensors have been arranged based on numerical results. The ultimate load and failure location via numerical modelling have been experimentally verified. Strains measured by fiber Bragg grating sensors have shown anomalies with load increased, indicating the onset and propagation of damage. Based on the damage-induced strain anomalies, four stages have been addressed to reveal the emergence, accumulation and propagation of damage during the loading process. Measurements by numerical simulation and surface mounted strain gauges have been found to be less sensitive to internal damage, proving the great significance of embedding fiber Bragg grating sensors to monitor interface damages of sandwich L-joint.

scholarly journals Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4272
Author(s):  
Oscar de la Torre ◽  
Ignazio Floris ◽  
Salvador Sales ◽  
Xavier Escaler
Keyword(s):  
Fiber Bragg Grating ◽  
Numerical Models ◽  
Vibration Measurement ◽  
Quality Data ◽  
Bragg Grating ◽  
Laser Vibrometer ◽  
Main Concern ◽  
High Expectations ◽  
Fiber Bragg Grating Sensors ◽  
Hydraulic Machinery

The present paper assesses the performance and characteristics of fiber Bragg grating sensors, with a special interest in their applications in hydraulic machinery and systems. The hydropower industry is turning to this technology with high expectations of obtaining high quality data to validate and calibrate numerical models that could be used as digital twins of key assets, further strengthening the sector’s relevant position within industry 4.0. Prior to any validation, fiber Bragg grating sensors’ ability to perform well underwater for long periods of time with minimal degradation, and their ease of scalability, drew the authors´ attention. A simplified modal analysis of a partially submerged beam is proposed here as a first step to validate the potential of this type of technology for hydropower applications. Fiber Bragg grating sensors are used to obtain the beam’s natural frequencies and to damp vibrations under different conditions. The results are compared with more established waterproof electric strain gauges and a laser vibrometer with good agreement. The presence of several sensors in a single fiber ensures high spatial resolution, fundamental to precisely determine vibration patterns, which is a main concern in this industry. In this work, the beam’s vibration patterns have been successfully captured under different excitations and conditions.

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