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Structural health monitoring of metal-to-glass–ceramics penetration during thermal cycling aging using femto-laser inscribed FBG sensors

Maintaining the mechanical strength and hermetic reliability of metal-to-glass–ceramics electrical penetration assembly (MTGC-EPA) is a key concern for ensuring the pressure boundaries of nuclear power plants. The transient temperature change caused by power adjusting or accidents in High Temperatur...

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Autores principales: Fan, Zhichun, Diao, Xingzhong, Hu, Kangjia, Zhang, Yong, Huang, Zhiyong, Kang, Yanbo, Yan, He
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7378200/
https://www.ncbi.nlm.nih.gov/pubmed/32704166
http://dx.doi.org/10.1038/s41598-020-69282-7
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author Fan, Zhichun
Diao, Xingzhong
Hu, Kangjia
Zhang, Yong
Huang, Zhiyong
Kang, Yanbo
Yan, He
author_facet Fan, Zhichun
Diao, Xingzhong
Hu, Kangjia
Zhang, Yong
Huang, Zhiyong
Kang, Yanbo
Yan, He
author_sort Fan, Zhichun
collection PubMed
description Maintaining the mechanical strength and hermetic reliability of metal-to-glass–ceramics electrical penetration assembly (MTGC-EPA) is a key concern for ensuring the pressure boundaries of nuclear power plants. The transient temperature change caused by power adjusting or accidents in High Temperature Reactor Pebble-bed Modules may affect the structural health of sealing glass–ceramics, even leading to radiation leakage. To evaluate whether the function could survive temperature variations during the service life, thermal cycling aging experiments were imposed to MTGC-EPA. A grating length-mismatched sensing method to monitor the residual strain, an important factor of glass–ceramics structural health, was demonstrated in real-time by femto-laser inscribed fiber Bragg grating (FBG) sensor during the curing process and thermal cycling aging. Scanning electron microscope (SEM) and leakage rate tests were carried out to obtain the comparisons of microstructure and hermeticity before and after the thermal cycling. The residual strain showed a slight growth trend with thermal cycles repetition and it persisted a high value (~ 4,000 με) reflected by both Bragg wavelength shift and spectrum shape. The grating length mismatched single FBG embedded in glass–ceramics was feasible to demodulate the temperature and strain simultaneously, and the embedded FBG method achieved the structural health monitoring of MTGC-EPA during thermal cycling aging with good accuracy and reliability. Combining with the results of SEM and leakage rate detecting, the structural health of MTGC-EPA was demonstrated to be capable to endure the severe thermal conditions in nuclear reactors.
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spelling pubmed-73782002020-07-24 Structural health monitoring of metal-to-glass–ceramics penetration during thermal cycling aging using femto-laser inscribed FBG sensors Fan, Zhichun Diao, Xingzhong Hu, Kangjia Zhang, Yong Huang, Zhiyong Kang, Yanbo Yan, He Sci Rep Article Maintaining the mechanical strength and hermetic reliability of metal-to-glass–ceramics electrical penetration assembly (MTGC-EPA) is a key concern for ensuring the pressure boundaries of nuclear power plants. The transient temperature change caused by power adjusting or accidents in High Temperature Reactor Pebble-bed Modules may affect the structural health of sealing glass–ceramics, even leading to radiation leakage. To evaluate whether the function could survive temperature variations during the service life, thermal cycling aging experiments were imposed to MTGC-EPA. A grating length-mismatched sensing method to monitor the residual strain, an important factor of glass–ceramics structural health, was demonstrated in real-time by femto-laser inscribed fiber Bragg grating (FBG) sensor during the curing process and thermal cycling aging. Scanning electron microscope (SEM) and leakage rate tests were carried out to obtain the comparisons of microstructure and hermeticity before and after the thermal cycling. The residual strain showed a slight growth trend with thermal cycles repetition and it persisted a high value (~ 4,000 με) reflected by both Bragg wavelength shift and spectrum shape. The grating length mismatched single FBG embedded in glass–ceramics was feasible to demodulate the temperature and strain simultaneously, and the embedded FBG method achieved the structural health monitoring of MTGC-EPA during thermal cycling aging with good accuracy and reliability. Combining with the results of SEM and leakage rate detecting, the structural health of MTGC-EPA was demonstrated to be capable to endure the severe thermal conditions in nuclear reactors. Nature Publishing Group UK 2020-07-23 /pmc/articles/PMC7378200/ /pubmed/32704166 http://dx.doi.org/10.1038/s41598-020-69282-7 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Fan, Zhichun
Diao, Xingzhong
Hu, Kangjia
Zhang, Yong
Huang, Zhiyong
Kang, Yanbo
Yan, He
Structural health monitoring of metal-to-glass–ceramics penetration during thermal cycling aging using femto-laser inscribed FBG sensors
title Structural health monitoring of metal-to-glass–ceramics penetration during thermal cycling aging using femto-laser inscribed FBG sensors
title_full Structural health monitoring of metal-to-glass–ceramics penetration during thermal cycling aging using femto-laser inscribed FBG sensors
title_fullStr Structural health monitoring of metal-to-glass–ceramics penetration during thermal cycling aging using femto-laser inscribed FBG sensors
title_full_unstemmed Structural health monitoring of metal-to-glass–ceramics penetration during thermal cycling aging using femto-laser inscribed FBG sensors
title_short Structural health monitoring of metal-to-glass–ceramics penetration during thermal cycling aging using femto-laser inscribed FBG sensors
title_sort structural health monitoring of metal-to-glass–ceramics penetration during thermal cycling aging using femto-laser inscribed fbg sensors
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7378200/
https://www.ncbi.nlm.nih.gov/pubmed/32704166
http://dx.doi.org/10.1038/s41598-020-69282-7
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