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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Jang, Sei-Hum
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Topics
Publications (10/10 displayed)
- 2019NDE THERMAL MAPPING USING THERMOCHROMIC SENSOR FILMS
- 2018Thermochromic Polymer Film Sensors for Detection of Incipient Thermal Damage in Carbon Fiber–Epoxy Compositescitations
- 2017Detection of incipient thermal damage in carbon fiber-epoxy composites using fluorescent thermal sensor films
- 2016Time temperature indicator film for monitoring composite repair adhesive cure using thermochromic fluorescent molecules
- 2014Time-temperature indicator for evaluating incipient thermal damage of CFRP
- 2014Damage detection for aerospace composites using matrix resins functionalized with fluorescent probe molecules
- 2013Influence of matrix resin mechanical properties on mechanochromic fluorescent damage probe response
- 2013Thermal damage detection of CFRP using coatings doped with fluorescent probes
- 2005Exceptional electro-optic properties through molecular design and controlled self-assemblycitations
- 2005Acentric lattice electro-optic materials by rational designcitations
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document
Time temperature indicator film for monitoring composite repair adhesive cure using thermochromic fluorescent molecules
Abstract
Carbon fiber composite part in-service repair can be challenging due to the need to carefully control the repair epoxy adhesive's cure conditions. Overheating the repair can cause damage to the undamaged matrix epoxy; underheating can cause a weak bond. The use of thermocouples to monitor and guide repair may not always be feasible. We have developed a polymer film that uses thermally activated fluorescent probe molecules in an effort to more easily determine the thermal exposure over the entire repair area. The films show dramatic color and fluorescence change related to the time and temperature of a thermal exposure following a first-order kinetic reaction model. In simulated repair scenarios the films identified areas of proper and improper exposure in both simple imaging and spectroscopic analysis, and a good/bad criterion for a repair thermal exposure was established based on the spectroscopic data.