Application of the Proposed Fiber Optic Time Differential BOCDA Sensor System for Impact Damage Detection of a Composite Cylinder

An optical-fiber-embedded composite cylinder was fabricated using the filament winding process with an interval of 12 mm in the longitudinal direction of the cylinder. The optical fiber was wound 160 turns around the cylinder, and the straight length was about 125 m. After a total of twelve impact e...

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Autores principales:	Bo-Hun Choi, Dae-Cheol Seo, Yong-Seok Kwon, Il-Bum Kwon
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	composite cylinder optical fiber BOCDA sensor system residual strain spatial resolution impact damage Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/0a42c85bc9e043ffaf6b83bd5c6dc546
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spelling	oai:doaj.org-article:0a42c85bc9e043ffaf6b83bd5c6dc5462021-11-11T15:17:24ZApplication of the Proposed Fiber Optic Time Differential BOCDA Sensor System for Impact Damage Detection of a Composite Cylinder10.3390/app1121102472076-3417https://doaj.org/article/0a42c85bc9e043ffaf6b83bd5c6dc5462021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10247https://doaj.org/toc/2076-3417An optical-fiber-embedded composite cylinder was fabricated using the filament winding process with an interval of 12 mm in the longitudinal direction of the cylinder. The optical fiber was wound 160 turns around the cylinder, and the straight length was about 125 m. After a total of twelve impact events of 5, 10, 15, and 20 J, the residual strain in the cylinder was measured using the proposed time differential BOCDA sensor system. This method makes the traditionally used optical delay unnecessary while increasing the degrees of freedom of using the modulation rate, which determines the spatial resolution of this measurement system. The modulation rates of optical light in the system were applied up to 16 Gbps, which is an eight-fold increase compared to our previous experiments. Damage maps were obtained by mapping the measured residual strain onto the structure of the cylinder, and compared using three spatial resolutions of 20, 10, and 6.25 mm. In the measured damage map, expansion deformation due to impact was measured at all impact points, and the impact location on the map and the actual location on the cylinder were exactly the same. The map measured from the composite showed a clear point-symmetrical shape with an increase in sharpness as the measurement resolution increased. At the highest resolution, material expansion and compression were observed to alternate with respect to the center of impact, like the surface deformation of a liquid caused by a thrown object. Furthermore, considered together with our previous experiments, we confirmed that this phenomenon propagated from the surface of the composite material to the interior, where the optical fiber was embedded. The total amount of residual strain formed around each impact point was linearly proportional to the applied external impact energy.Bo-Hun ChoiDae-Cheol SeoYong-Seok KwonIl-Bum KwonMDPI AGarticlecomposite cylinderoptical fiberBOCDA sensor systemresidual strainspatial resolutionimpact damageTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10247, p 10247 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	composite cylinder optical fiber BOCDA sensor system residual strain spatial resolution impact damage Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	composite cylinder optical fiber BOCDA sensor system residual strain spatial resolution impact damage Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Bo-Hun Choi Dae-Cheol Seo Yong-Seok Kwon Il-Bum Kwon Application of the Proposed Fiber Optic Time Differential BOCDA Sensor System for Impact Damage Detection of a Composite Cylinder
description	An optical-fiber-embedded composite cylinder was fabricated using the filament winding process with an interval of 12 mm in the longitudinal direction of the cylinder. The optical fiber was wound 160 turns around the cylinder, and the straight length was about 125 m. After a total of twelve impact events of 5, 10, 15, and 20 J, the residual strain in the cylinder was measured using the proposed time differential BOCDA sensor system. This method makes the traditionally used optical delay unnecessary while increasing the degrees of freedom of using the modulation rate, which determines the spatial resolution of this measurement system. The modulation rates of optical light in the system were applied up to 16 Gbps, which is an eight-fold increase compared to our previous experiments. Damage maps were obtained by mapping the measured residual strain onto the structure of the cylinder, and compared using three spatial resolutions of 20, 10, and 6.25 mm. In the measured damage map, expansion deformation due to impact was measured at all impact points, and the impact location on the map and the actual location on the cylinder were exactly the same. The map measured from the composite showed a clear point-symmetrical shape with an increase in sharpness as the measurement resolution increased. At the highest resolution, material expansion and compression were observed to alternate with respect to the center of impact, like the surface deformation of a liquid caused by a thrown object. Furthermore, considered together with our previous experiments, we confirmed that this phenomenon propagated from the surface of the composite material to the interior, where the optical fiber was embedded. The total amount of residual strain formed around each impact point was linearly proportional to the applied external impact energy.
format	article
author	Bo-Hun Choi Dae-Cheol Seo Yong-Seok Kwon Il-Bum Kwon
author_facet	Bo-Hun Choi Dae-Cheol Seo Yong-Seok Kwon Il-Bum Kwon
author_sort	Bo-Hun Choi
title	Application of the Proposed Fiber Optic Time Differential BOCDA Sensor System for Impact Damage Detection of a Composite Cylinder
title_short	Application of the Proposed Fiber Optic Time Differential BOCDA Sensor System for Impact Damage Detection of a Composite Cylinder
title_full	Application of the Proposed Fiber Optic Time Differential BOCDA Sensor System for Impact Damage Detection of a Composite Cylinder
title_fullStr	Application of the Proposed Fiber Optic Time Differential BOCDA Sensor System for Impact Damage Detection of a Composite Cylinder
title_full_unstemmed	Application of the Proposed Fiber Optic Time Differential BOCDA Sensor System for Impact Damage Detection of a Composite Cylinder
title_sort	application of the proposed fiber optic time differential bocda sensor system for impact damage detection of a composite cylinder
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0a42c85bc9e043ffaf6b83bd5c6dc546
work_keys_str_mv	AT bohunchoi applicationoftheproposedfiberoptictimedifferentialbocdasensorsystemforimpactdamagedetectionofacompositecylinder AT daecheolseo applicationoftheproposedfiberoptictimedifferentialbocdasensorsystemforimpactdamagedetectionofacompositecylinder AT yongseokkwon applicationoftheproposedfiberoptictimedifferentialbocdasensorsystemforimpactdamagedetectionofacompositecylinder AT ilbumkwon applicationoftheproposedfiberoptictimedifferentialbocdasensorsystemforimpactdamagedetectionofacompositecylinder
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Application of the Proposed Fiber Optic Time Differential BOCDA Sensor System for Impact Damage Detection of a Composite Cylinder

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