Measurements of the thermal diffusivity tensor of polymer-carbon fiber composites by photothermal methods
- Univ. del Pais Vasco, Bilboa (Spain)
The thermal diffusivity tensor of a polymer-carbon fiber composite with unidirectionally distributed fibers has been measured using a modulated photothermal mirage device. The thermal diffusivity along the fibers is k{sub {parallel}} = 6.0 {+-} 0.5 mm{sup 2}{center_dot}s{sup {minus}1}, that perpendicular to the fibers is k{sub {perpendicular}} = 0.35 {+-} 0.05 mm{sup 2}{center_dot}s{sup {minus}1}, and that perpendicular to the sample surface is k{sub z} = 0.40 {+-} 0.15 mm{sup 2}{center_dot}s{sup {minus}1}. These results have been confirmed by independent measurements on the sample by other laboratories using three other different photothermal techniques. A previous claim on anomalous results found on this sample (k{sub {parallel}} < k{sub {perpendicular}} and high thermal diffusivities) can be explained by the inappropriate use of the frequency range. The authors have also found that there is not perfect thermal contact between the fibers and the matrix, which can be characterized by the thermal contact resistance of R{sub th} = (9 {+-} 2) {times} 10{sup {minus}6} m{sup 2}{center_dot}K{center_dot}W{sup {minus}1}.
- OSTI ID:
- 675555
- Report Number(s):
- CONF-970629-; ISSN 0195-928X; TRN: IM9833%%164
- Journal Information:
- International Journal of Thermophysics, Vol. 19, Issue 2; Conference: 13. symposium on thermophysical properties, Boulder, CO (United States), 22-27 Jun 1997; Other Information: PBD: Mar 1998
- Country of Publication:
- United States
- Language:
- English
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