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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
in Cooperation with on an Cooperation-Score of 37%
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
Damage detection for aerospace composites using matrix resins functionalized with fluorescent probe molecules
Abstract
Damage detection in aerospace composite parts is difficult because of their opacity and inhomogeneity. Low energy impact damage is especially troublesome because it often leaves no visible surface damage but can cause significant subsurface damage. Ultrasonic C-Scan can detect this damage but requires significant airplane downtime to conduct. This research proposes a method of damage detection based on fluorescent molecular probes with mechanochromic properties. Several molecules were designed and synthesized to be compatible with aerospace matrix resin and coating chemistry, and to exhibit fluorescent behavior that is dependent on local deformation and damage conditions. In a room temperature cured DGEBA-DETA solid resin, one probe showed strong fluorescent emission color change when samples were deformed in uniaxial compression or exposed to elevated temperatures. Relationships between the deformation mechanisms of epoxy and probe activation kinetics are explored using fluorescence imaging, reaction kinetics analysis, mechanokinetic, and hydrostatic pressure experiments. The results of testing support an activation mechanism for the probe that is dependent on intermolecular shear motion of the epoxy network. Copyright 2014 by Ryan E Toivola.