Evaluation of embedded FBGs in composite overwrapped pressure vessels for strain based structural health monitoring

Peña, Francisco de la; Strutner, Scott M.; Richards, W. Lance; Piazza, Anthony; Parker, Allen R.

doi:10.1117/12.2046343

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…However, even with modest loading, CFRPs develop complicated internal damage that can include matrix cracking, delaminations, and fiber breakage [29]. Pena et al [30] used surface mounted and embedded FBGs in a COPV and developed a strain-measurement-based SHM parameter that can be used to track the COPV structural health throughout loading. Also, acoustic emission is often used as a nondestructive method for early detection of damage.…”

Section: Determination Of the Wing Shape And In-flight Loads Of An Ulmentioning

confidence: 99%

Large Scale Applications Using FBG Sensors: Determination of In-Flight Loads and Shape of a Composite Aircraft Wing

Nicolas¹,

Sullivan²,

Richards

2016

Aerospace

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Abstract:Technological advances have enabled the development of a number of optical fiber sensing methods over the last few years. The most prevalent optical technique involves the use of fiber Bragg grating (FBG) sensors. These small, lightweight sensors have many attributes that enable their use for a number of measurement applications. Although much literature is available regarding the use of FBGs for laboratory level testing, few publications in the public domain exist of their use at the operational level. Therefore, this paper gives an overview of the implementation of FBG sensors for large scale structures and applications. For demonstration, a case study is presented in which FBGs were used to determine the deflected wing shape and the out-of-plane loads of a 5.5-m carbon-composite wing of an ultralight aerial vehicle. The in-plane strains from the 780 FBG sensors were used to obtain the out-of-plane loads as well as the wing shape at various load levels. The calculated out-of-plane displacements and loads were within 4.2% of the measured data. This study demonstrates a practical method in which direct measurements are used to obtain critical parameters from the high distribution of FBG sensors. This procedure can be used to obtain information for structural health monitoring applications to quantify healthy vs. unhealthy structures.

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Section: Determination Of the Wing Shape And In-flight Loads Of An Ulmentioning

confidence: 99%

Large Scale Applications Using FBG Sensors: Determination of In-Flight Loads and Shape of a Composite Aircraft Wing

Nicolas¹,

Sullivan²,

Richards

2016

Aerospace

View full text Add to dashboard Cite

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Measurement of Structural Loads Using a Novel MEMS Extrinsic Fabry–Perot Strain Sensor

et al. 2019

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In this paper, microelectromechanical systems (MEMS) technology was used to fabricate a novel extrinsic fiber Fabry–Perot (EFFP) strain sensor; this fiber sensor is applied to measure load with higher precision for a small structure. The sensor cavity consists of two Fabry–Perot (FP) cavity mirrors that are processed by surface micromachining and then fused and spliced together by the silicon–glass anode bonding process. The initial cavity length can be strictly controlled, and the excellent parallelism of the two faces of the cavity results in a high interference fineness. Then, the anti-reflection coating process is applied to the sensor to improve the clarity of the interference signal with the cavity, with its wavelength working within the range of the C + L band. Next, the sensor placement is determined by the finite element software Nastran. Experimental results indicate that the sensor exhibits a good linear response (99.77%) to load changes and a high repeatability. Considering the strain transfer coefficient, the sensitivity for the tested structure load is as high as 35.6 pm/N. Due to the miniaturization, repeatability, and easy-to-batch production, the proposed sensor can be used as a reliable and practical force sensor.

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Evaluation of embedded FBGs in composite overwrapped pressure vessels for strain based structural health monitoring

Cited by 2 publications

References 2 publications

Large Scale Applications Using FBG Sensors: Determination of In-Flight Loads and Shape of a Composite Aircraft Wing

Large Scale Applications Using FBG Sensors: Determination of In-Flight Loads and Shape of a Composite Aircraft Wing

Measurement of Structural Loads Using a Novel MEMS Extrinsic Fabry–Perot Strain Sensor

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