Combining embedded Fibre Bragg Grating sensors and modal analysis techniques to monitor fatigue induced propagating delaminations in composite laminates

2015 ◽  
pp. 537-542
Author(s):  
A Lamberti ◽  
G Chiesura ◽  
B DePauw ◽  
S Van landuit
Keyword(s):  
Modal Analysis ◽  
Composite Laminates ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Analysis Techniques

High Strain Monitoring during Fatigue Loading of Thermoplastic Composites Using Imbedded Draw Tower Fibre Bragg Grating Sensors

2008 ◽  
Vol 56 ◽  
pp. 441-446 ◽  
Author(s):  
Eli Voet ◽  
Geert Luyckx ◽  
Ives De Baere ◽  
Joris Degrieck ◽  
J. Vlekken ◽  
...  
Keyword(s):  
Composite Laminates ◽  
High Strength ◽  
Fatigue Loading ◽  
Strain Sensors ◽  
Thermoplastic Composites ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Strain Measurements ◽  
Strain Monitoring

This paper presents the experimental study of fibre Bragg grating sensors for measuring strain inside composite laminates during fatigue loading. The optical fibres are imbedded inside thermoplastic CFRP test-coupons which have an ultimate strain of about 1.1%. Tension – tension fatigue cycling at a rate of 5Hz is been carried out at 314MPa with a maximum strain of 0.51%. At such extreme strain levels the use of high strength sensors becomes inevitable. Neither the sensor nor the composite test-coupons showed any significant degradation even after more than 500000 cycles. Fibre optic Bragg grating sensors are known to be very accurate strain sensors but one should be very careful interpreting their response once they are imbedded inside composite materials. In this study high strength fibre Bragg grating sensors with coating are imbedded in composite test coupons and a pretty good correlation was found between the strain measurements of an electrical extensometer and the imbedded sensor during the complete cycling. The high strength sensor show to be very feasible for extreme and long term strain measurements.

scholarly journals Strain Modal Analysis of Small and Light Pipes Using Distributed Fibre Bragg Grating Sensors

Sensors ◽  
2016 ◽  
Vol 16 (10) ◽  
pp. 1583 ◽  
Author(s):  
Jun Huang ◽  
Zude Zhou ◽  
Lin Zhang ◽  
Juntao Chen ◽  
Chunqian Ji ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Bragg Grating ◽  
Fibre Bragg Grating

In-situ impact-induced damage assessment of woven composite laminates through a fibre Bragg grating sensor network

2009 ◽  
Vol 113 (1144) ◽  
pp. 357-370 ◽  
Author(s):  
R. C. Garrett ◽  
K. J. Peters ◽  
M. A. Zikry
Keyword(s):  
Sensor Network ◽  
Composite Laminates ◽  
Contact Forces ◽  
Bragg Grating ◽  
Residual Lifetime ◽  
Fibre Bragg Grating ◽  
Woven Composite ◽  
Average Residual ◽  
Residual Strains ◽  
Critical Damage

Abstract Woven composite specimens with embedded fibre Bragg grating (FBG) sensor networks were impacted at low velocities, while global measurements of contact forces and dissipated energies were obtained from drop tower measurements, and local residual, post-impact strain values were obtained from the FBG sensors. Critical damage events were identified in the global data for these specimens and damage signatures in the residual strain data corresponding to these critical damage events were correlated. The results indicate that the full spectral scan information from the sensor network, although obtainable at a lower scan rate, provide more reliable residual lifetime information than average residual strains.

Amplification of fibre Bragg grating reflectivity by post-writing exposure with a 193 nm ArF laser

1994 ◽  
Vol 30 (14) ◽  
pp. 1133-1134 ◽  
Author(s):  
P. E. Dyer ◽  
K. C. Byron ◽  
R. J. Farley ◽  
R. Giedl
Keyword(s):  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Arf Laser ◽  
193 Nm

Microwave phase shifter based on fibre Bragg grating

1998 ◽  
Vol 34 (21) ◽  
pp. 2051 ◽  
Author(s):  
B. Ortega ◽  
J.L. Cruz ◽  
M.V. Andrés ◽  
A. Díez ◽  
D. Pastor ◽  
...  
Keyword(s):  
Phase Shifter ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Microwave Phase Shifter
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