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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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Stratoudaki, Theodosia
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2020In-process calibration of a non-destructive testing system used for in-process inspection of multi-pass weldingcitations
- 2018Laser induced phased arrays for remote ultrasonic imaging of additive manufactured components
- 2015Fabrication of Cheap Optical Transducers (CHOTs) on film carriers for in-situ application and generation of surface acoustic wavescitations
- 2008Measurement of elastic nonlinearity using remote laser ultrasonics and CHeap Optical Transducers and dual frequency surface acoustic wavescitations
- 2007Cheap optical transducers (CHOTs) for narrowband ultrasonic applicationscitations
- 2003The role of epoxy resin in the mechanism of laser generated ultrasound in carbon fiber reinforced compositescitations
- 2001Laser generated ultrasoundcitations
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article
The role of epoxy resin in the mechanism of laser generated ultrasound in carbon fiber reinforced composites
Abstract
<p>Epoxy resins are essential to the fabrication of carbon fiber reinforced composites (CFRCs). This paper investigates laser generated ultrasound in epoxy resins using three pulsed lasers: A TEA CO<sub>2</sub>, a fundamental Nd:YAG and a XeCl excimer. In the low power thermoelastic regime, the laser beam causes the surface of the sample to expand rapidly, in times that are comparable to the rise time of the laser pulse. In non-metals the phenomenon is dominated by the optical absorption depth, which is a function both of the properties of the material and the laser wavelength, and for epoxy resins, varies from a few microns to several millimeters. Compared to the thermoelastic source in metals, a bigger volume of the material is affected, the temperature rise is less and the amplitude of the longitudinal wave is greater. This condition is referred to as "a buried thermoelastic source". In CFRCs, the superficial layer of epoxy resin (typically 50 - 100 microns thick) plays an important role to the generation mechanism. At the Nd:YAG wavelength the epoxy is transparent and acts as a constrained layer. At the TEA CO<sub>2</sub> and the XeCl excimer wavelengths both the epoxy and the underlying fibers absorb strongly. Experiments were carried out on CFRC and pure epoxy resin samples, comparative results and efficiency graphs are presented.</p>