Strain Monitoring of a Structural Adhesive Bond by Embedding a Polymer Optical Fiber

  • In recent decades, adhesive bonding technology has become increasingly important in all industrial sectors, for example in the aerospace industry, the automotive industry or the construction industry. This is accompanied by an increased need for monitoring of adhesive bonds, especially for load-bearing, structural joints. In order to detect a possible failure at an early stage, this work is investigating a cost-effective sensor principle based on embedding of a polymer optical fiber (POF) into the adhesive layer. The strain and stress behavior of the adhesive bond are transferred to the POF and change its light-guiding properties. In the presented work, different light coupling conditions into the fiber (full excitation and angle-selective excitation) and different measurable quantities of the transmitted light decoupled from the fiber (photocurrent and far-field) are studied, to find an optimum sensor performance. The combination of a structural polyurethane adhesive with commercially available POF is investigated. The results show aIn recent decades, adhesive bonding technology has become increasingly important in all industrial sectors, for example in the aerospace industry, the automotive industry or the construction industry. This is accompanied by an increased need for monitoring of adhesive bonds, especially for load-bearing, structural joints. In order to detect a possible failure at an early stage, this work is investigating a cost-effective sensor principle based on embedding of a polymer optical fiber (POF) into the adhesive layer. The strain and stress behavior of the adhesive bond are transferred to the POF and change its light-guiding properties. In the presented work, different light coupling conditions into the fiber (full excitation and angle-selective excitation) and different measurable quantities of the transmitted light decoupled from the fiber (photocurrent and far-field) are studied, to find an optimum sensor performance. The combination of a structural polyurethane adhesive with commercially available POF is investigated. The results show a high potential of the method for simple photocurrent measurement (transmission loss of 8% by half of maximum load) and an even more sensitive sensor effect for mode-dependent light power measurement.show moreshow less

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Metadaten
Author:Josef Weiland, Michael Luber, Katharina Rostan, Alexander Schiebahn, Rainer EngelbrechtORCiD, Uwe Reisgen
DOI:https://doi.org/10.1007/978-3-031-07254-3_75
ISBN:9783031072536
ISSN:2366-2557
Parent Title (English):European Workshop on Structural Health Monitoring , Vol I
Publisher:Springer International Publishing
Place of publication:Cham
Document Type:Part of a Book
Language:English
Date of first Publication:2022/06/19
Release Date:2024/06/20
Pagenumber:10
First Page:745
Last Page:754
institutes:Fakultät für Elektrotechnik Feinwerktechnik Informationstechnik
Polymer Optical Fiber Application Center
Research Themes:Materialien & Produktionstechnik
Licence (German):Keine Lizenz - Deutsches Urheberrecht gilt
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