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![]() BERTOLOTTI, Mario, FERRARI, Aldo, LIAKHOU, Gregory, LI VOTI, Roberto, MARRAS, A., EZQUERRA, Tiberio A., BALTA-CALLEJA, Francisco Jose. Thermal anisotropy of polymer carbon fiber composites as revealed by photodeflection methods. In: Journal of Applied Physics, 1995, vol. 78, pp. 5706-5712. ISSN 0021-8979. DOI: https://doi.org/10.1063/1.359630 |
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Journal of Applied Physics | ||||||
Volumul 78 / 1995 / ISSN 0021-8979 /ISSNe 1089-7550 | ||||||
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DOI:https://doi.org/10.1063/1.359630 | ||||||
Pag. 5706-5712 | ||||||
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Thermal diffusivity for carbon fiber composites was measured using different fiber types and polymer matrices. Photothermal testing was performed in the various directions parallel and perpendicular to the carbon fiber axis by different photothermal configurations. By focusing the laser beam with a spherical lens, local inhomogeneities of the composite surface in the range of 10 μm are distinguished. When focusing is done with the aid of a cylindrical lens an averaging over larger scales of the photothermal deflected signal takes place. The results for various carbon fiber materials are discussed in terms of thermal diffusion lengths and thermal diffusivity values. It is shown that the thermal photodeflection method is suitable for measuring anisotropy in oriented carbon fiber composites. |
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Cuvinte-cheie Engineering controlled terms Anisotropy, Calculations, Laser beams, Lenses, scanning electron microscopy, thermal conductivity, Thermal diffusion, Thermal variables measurement, X ray diffraction Engineering uncontrolled terms Carbon fiber composites, Cylindrical lens focusing, Phase method, Photodeflection methods, Spherical lens focusing Engineering main heading Carbon fiber reinforced plastics |
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