Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Zustandsüberwachung von Klebverbindungen unter Verwendung einer integrierten optischen Polymerfaser
Adhesive bonding as a joining technology has become increasingly important in recent decades, both in science and in industry. However, adhesively bonded joints have the technical disadvantage that they cannot be tested 100% non-destructively and that the aging behavior of the adhesives and their interaction with the surface are very complex and can only be predicted to a limited extent. The topic of structural health monitoring of adhesively bonded joints is motivated by this uncertain initial situation. This dissertation therefore deals with the development of a method for structural health monitoring of adhesively bonded joints by using a polymer optical fiber (POF) integrated into the adhesive layer. The necessary development steps in the bonding process regarding surface and interfacial behavior, the mechanical behavior of the adhesive-POF composite and the optical behavior of the POF as a sensor fiber are investigated. The composite of a POF with three varying adhesive systems silicone, polyurethane and epoxy resin is examined. The surface and interface investigations show that activation of the POF surface in low-pressure plasma with the process gases oxygen or nitrogen enables a stable bond between POF and adhesive. The mechanical studies have shown that the degradation of the overall bond, e.g. validated at the maximum force, is low for adhesive systems with similar mechanical properties as the POF. The high-resolution studies of the bond using digital image correlation indicate that stressing the optical cladding of the POFleads to a change in the optical conditions of total reflection necessary for light conduction. This results in a direct correlation between the stress condition and the light transmission in the POF, which allows the outcoupled light to be used as a sensor signal. In the optical studies, it was shown that light coupling of collimated light at theacceptance angle of the POF (30°) leads to significant strain-dependent signal changes. The results could be validated on a pipe-to-socket ...
Zustandsüberwachung von Klebverbindungen unter Verwendung einer integrierten optischen Polymerfaser
Adhesive bonding as a joining technology has become increasingly important in recent decades, both in science and in industry. However, adhesively bonded joints have the technical disadvantage that they cannot be tested 100% non-destructively and that the aging behavior of the adhesives and their interaction with the surface are very complex and can only be predicted to a limited extent. The topic of structural health monitoring of adhesively bonded joints is motivated by this uncertain initial situation. This dissertation therefore deals with the development of a method for structural health monitoring of adhesively bonded joints by using a polymer optical fiber (POF) integrated into the adhesive layer. The necessary development steps in the bonding process regarding surface and interfacial behavior, the mechanical behavior of the adhesive-POF composite and the optical behavior of the POF as a sensor fiber are investigated. The composite of a POF with three varying adhesive systems silicone, polyurethane and epoxy resin is examined. The surface and interface investigations show that activation of the POF surface in low-pressure plasma with the process gases oxygen or nitrogen enables a stable bond between POF and adhesive. The mechanical studies have shown that the degradation of the overall bond, e.g. validated at the maximum force, is low for adhesive systems with similar mechanical properties as the POF. The high-resolution studies of the bond using digital image correlation indicate that stressing the optical cladding of the POFleads to a change in the optical conditions of total reflection necessary for light conduction. This results in a direct correlation between the stress condition and the light transmission in the POF, which allows the outcoupled light to be used as a sensor signal. In the optical studies, it was shown that light coupling of collimated light at theacceptance angle of the POF (30°) leads to significant strain-dependent signal changes. The results could be validated on a pipe-to-socket ...
Zustandsüberwachung von Klebverbindungen unter Verwendung einer integrierten optischen Polymerfaser
Weiland, Josef (Autor:in) / Reisgen, Uwe / Schröder, Kai-Uwe / Engelbrecht, Rainer
01.01.2024
Düren : Shaker Verlag, Aachener Berichte Fügetechnik 2024,3 1 Online-Ressource : Illustrationen (2024). doi:10.18154/RWTH-2024-07373 = Dissertation, RWTH Aachen University, 2024
Hochschulschrift
Elektronische Ressource
Deutsch
FAHRZEUG-SCHEIBE MIT EINER VIELZAHL VON INTEGRIERTEN ELEKTRO-OPTISCHEN ELEMENTEN
| Europäisches Patentamt | 2021
FAHRZEUG-SCHEIBE MIT EINER VIELZAHL VON INTEGRIERTEN ELEKTRO-OPTISCHEN ELEMENTEN
| Europäisches Patentamt | 2019