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Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors

Although adhesive joining has many advantages over traditional joining techniques, their integrity is more difficult to examine and monitor. Serious structural failures might follow if adhesive joint degradation goes undetected. Available non-destructive examination (NDE) methods to detect defects a...

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Autores principales: Shin, Chow-Shing, Lin, Tzu-Chieh
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8434539/
https://www.ncbi.nlm.nih.gov/pubmed/34502994
http://dx.doi.org/10.3390/polym13172954
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author Shin, Chow-Shing
Lin, Tzu-Chieh
author_facet Shin, Chow-Shing
Lin, Tzu-Chieh
author_sort Shin, Chow-Shing
collection PubMed
description Although adhesive joining has many advantages over traditional joining techniques, their integrity is more difficult to examine and monitor. Serious structural failures might follow if adhesive joint degradation goes undetected. Available non-destructive examination (NDE) methods to detect defects are helpful in discovering defective joints during fabrication. For long-term monitoring of joint integrity, many of these NDE techniques are prohibitively expensive and time-consuming to carry out. Recently, fiber Bragg grating (FBG) sensors have been shown to be able to reflect strain in adhesive joints and offer an economical alternative for on-line monitoring. Most of the available works relied on the peak shifting phenomenon for sensing and studies on the use of full spectral responses for joint integrity monitoring are still lacking. Damage and disbonding inside an adhesive joint will give rise to non-uniform strain field that may chirp the FBG spectrum. It is reasoned that the full spectral responses may reveal the damage status inside the adhesive joints. In this work, FBGs are embedded in composite-to-composite single lap joints. Tensile and fatigue loading to joint failure have been applied, and the peak splitting and broadening of the full spectral responses from the embedded FBGs are shown to reflect the onset and development of damages. A parameter to quantify the change in the spectral responses has been proposed and independent assessment of the damage monitoring capability has been verified with post-damage fatigue tests.
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spelling pubmed-84345392021-09-12 Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors Shin, Chow-Shing Lin, Tzu-Chieh Polymers (Basel) Article Although adhesive joining has many advantages over traditional joining techniques, their integrity is more difficult to examine and monitor. Serious structural failures might follow if adhesive joint degradation goes undetected. Available non-destructive examination (NDE) methods to detect defects are helpful in discovering defective joints during fabrication. For long-term monitoring of joint integrity, many of these NDE techniques are prohibitively expensive and time-consuming to carry out. Recently, fiber Bragg grating (FBG) sensors have been shown to be able to reflect strain in adhesive joints and offer an economical alternative for on-line monitoring. Most of the available works relied on the peak shifting phenomenon for sensing and studies on the use of full spectral responses for joint integrity monitoring are still lacking. Damage and disbonding inside an adhesive joint will give rise to non-uniform strain field that may chirp the FBG spectrum. It is reasoned that the full spectral responses may reveal the damage status inside the adhesive joints. In this work, FBGs are embedded in composite-to-composite single lap joints. Tensile and fatigue loading to joint failure have been applied, and the peak splitting and broadening of the full spectral responses from the embedded FBGs are shown to reflect the onset and development of damages. A parameter to quantify the change in the spectral responses has been proposed and independent assessment of the damage monitoring capability has been verified with post-damage fatigue tests. MDPI 2021-08-31 /pmc/articles/PMC8434539/ /pubmed/34502994 http://dx.doi.org/10.3390/polym13172954 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Shin, Chow-Shing
Lin, Tzu-Chieh
Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors
title Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors
title_full Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors
title_fullStr Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors
title_full_unstemmed Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors
title_short Adhesive Joint Integrity Monitoring Using the Full Spectral Response of Fiber Bragg Grating Sensors
title_sort adhesive joint integrity monitoring using the full spectral response of fiber bragg grating sensors
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8434539/
https://www.ncbi.nlm.nih.gov/pubmed/34502994
http://dx.doi.org/10.3390/polym13172954
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