Hygrothermal Damage Monitoring of Composite Adhesive Joint Using the Full Spectral Response of Fiber Bragg Grating Sensors
Adhesive joints in composite structures are subject to degradation by elevated temperature and moisture. Moisture absorption leads to swelling, plasticization, weakening of the interface, interfacial defects/cracking and reduction in strength. Moisture and material degradation before the formation o...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-01-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/3/368 |
| _version_ | 1797485362399936512 |
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| author | Chow-Shing Shin Tzu-Chieh Lin |
| author_facet | Chow-Shing Shin Tzu-Chieh Lin |
| author_sort | Chow-Shing Shin |
| collection | DOAJ |
| description | Adhesive joints in composite structures are subject to degradation by elevated temperature and moisture. Moisture absorption leads to swelling, plasticization, weakening of the interface, interfacial defects/cracking and reduction in strength. Moisture and material degradation before the formation of defects are not readily revealed by conventional non-destructive examination techniques. Embedded fiber Bragg grating (FBG) sensors can reflect the swelling strain in adhesive joints and offer an economical alternative for on-line monitoring of moisture absorption under hygrothermal aging. Most of the available works relied on the peak shifting phenomenon for sensing. Degradation of adhesive and interfacial defects will lead to non-uniform strain that may chirp the FBG spectrum, causing complications in the peak shifting measurement. It is reasoned that the full spectral responses may be more revealing regarding the joint’s integrity. Studies on this aspect are still lacking. In this work, single-lap joint composite specimens with embedded FBGs are soaked in 60 °C water for 30 days. Spectrum evolution during this period and subsequent tensile and fatigue failure has been studied to shed some light on the possible use of the full spectral response to monitor the development of hygrothermal degradation. |
| first_indexed | 2024-03-09T23:17:40Z |
| format | Article |
| id | doaj.art-873baef329954a449e1254ad673230e9 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T23:17:40Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-873baef329954a449e1254ad673230e92023-11-23T17:32:38ZengMDPI AGPolymers2073-43602022-01-0114336810.3390/polym14030368Hygrothermal Damage Monitoring of Composite Adhesive Joint Using the Full Spectral Response of Fiber Bragg Grating SensorsChow-Shing Shin0Tzu-Chieh Lin1Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, TaiwanDepartment of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, TaiwanAdhesive joints in composite structures are subject to degradation by elevated temperature and moisture. Moisture absorption leads to swelling, plasticization, weakening of the interface, interfacial defects/cracking and reduction in strength. Moisture and material degradation before the formation of defects are not readily revealed by conventional non-destructive examination techniques. Embedded fiber Bragg grating (FBG) sensors can reflect the swelling strain in adhesive joints and offer an economical alternative for on-line monitoring of moisture absorption under hygrothermal aging. Most of the available works relied on the peak shifting phenomenon for sensing. Degradation of adhesive and interfacial defects will lead to non-uniform strain that may chirp the FBG spectrum, causing complications in the peak shifting measurement. It is reasoned that the full spectral responses may be more revealing regarding the joint’s integrity. Studies on this aspect are still lacking. In this work, single-lap joint composite specimens with embedded FBGs are soaked in 60 °C water for 30 days. Spectrum evolution during this period and subsequent tensile and fatigue failure has been studied to shed some light on the possible use of the full spectral response to monitor the development of hygrothermal degradation.https://www.mdpi.com/2073-4360/14/3/368adhesive jointhygrothermal damagefiber Bragg gratingtensile failurefatigue failurefull spectral response |
| spellingShingle | Chow-Shing Shin Tzu-Chieh Lin Hygrothermal Damage Monitoring of Composite Adhesive Joint Using the Full Spectral Response of Fiber Bragg Grating Sensors Polymers adhesive joint hygrothermal damage fiber Bragg grating tensile failure fatigue failure full spectral response |
| title | Hygrothermal Damage Monitoring of Composite Adhesive Joint Using the Full Spectral Response of Fiber Bragg Grating Sensors |
| title_full | Hygrothermal Damage Monitoring of Composite Adhesive Joint Using the Full Spectral Response of Fiber Bragg Grating Sensors |
| title_fullStr | Hygrothermal Damage Monitoring of Composite Adhesive Joint Using the Full Spectral Response of Fiber Bragg Grating Sensors |
| title_full_unstemmed | Hygrothermal Damage Monitoring of Composite Adhesive Joint Using the Full Spectral Response of Fiber Bragg Grating Sensors |
| title_short | Hygrothermal Damage Monitoring of Composite Adhesive Joint Using the Full Spectral Response of Fiber Bragg Grating Sensors |
| title_sort | hygrothermal damage monitoring of composite adhesive joint using the full spectral response of fiber bragg grating sensors |
| topic | adhesive joint hygrothermal damage fiber Bragg grating tensile failure fatigue failure full spectral response |
| url | https://www.mdpi.com/2073-4360/14/3/368 |
| work_keys_str_mv | AT chowshingshin hygrothermaldamagemonitoringofcompositeadhesivejointusingthefullspectralresponseoffiberbragggratingsensors AT tzuchiehlin hygrothermaldamagemonitoringofcompositeadhesivejointusingthefullspectralresponseoffiberbragggratingsensors |