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Fatigue of Smart Composite Metal Joints
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Engineering Design and Materials.
2013 (English)MasteroppgaveStudent thesis
Abstract [en]

Adhesive joints are ideal for connecting dissimilar materials in optimized structures. Low weight and potential savings in manufacturing costs are major advantages related to such joints, but their use is currently limited by uncertainties about the long-term performance of the joints. A smart material with the ability to monitor its state of health would be ideal for monitoring of the long-term performance and also for making improvements to the joints. This thesis has explored the fatigue behavior of composite metal joints and how optical fibers can be included in the joints as a method of integrated health monitoring. Cracked IPE100 steel beams were repaired with composite patches. The fatigue life of the patch repaired beams was tested in a four point bend test. Optical fibers were embedded in the adhesive layer of the composite patch and on top of the patch. An optical backscatter reflectometer was used to measure the strains in the composite metal joint during testing. These measurements were compared against finite element analysis and strain gauges. The results were found to coincide well with the finite element analysis and the strain gauges. The optical fibers were proven to detect damage propagation and growth versus number of cycles. It was observed that different failure modes propagating in the composite metal joint could be detected and distinguished by the optical fibers.

Place, publisher, year, edition, pages
Institutt for produktutvikling og materialer , 2013. , 105 p.
URN: urn:nbn:no:ntnu:diva-22283Local ID: ntnudaim:9687OAI: diva2:648738
Available from: 2013-09-16 Created: 2013-09-16 Last updated: 2013-09-16Bibliographically approved

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