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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Development of an in-Plane Thermal Diffusivity Measurement Method with a Lock-in Thermography and Application to High Thermal Conductive Cfrps

Get access (open in a dialog) DOI: 10.1615/IHTC15.mnf.009843
pages 5047-5061

Résumé

This paper presents a new measurement technic of the detailed in-plane thermal diffusivity by a laser-spot-periodic-heating-method using a lock-in thermography. By using the lock-in thermography, detailed in-plane thermal diffusivity can be obtained at one measurement. At first, the validity of the measurement method is confirmed with pure aluminum and zirconia as reference materials. The measurement is conducted with changing the heating frequency to verify about frequency dependence of the result. As a result, as long as the sample is heated within the heating frequency restricted by the infinite size of the sample, it was confirmed that the analysis result has no frequency dependence and matches the recommended value of the reference sample well. Next, detailed in-plane thermal diffusivity measurement is applied for high thermal conductive carbon fiber reinforced plastics (CFRPs) samples to understand about heat conduction of the CFRP. The two types of CFRP sample, one is unidirectional (UD) with unidirectional carbon fibers and the other is cross-ply (CP) with orthogonal two-directional carbon fibers, are measured with changing the heating frequency. As a result, it is revealed that the analysis result of UD sample has large anisotropy and has no heating frequency dependence. On the other hand, it is revealed that the result of CP sample has the heating frequency dependence only in the fibers orienting direction. This is caused by the heat conduction ways specific to CFRP sample, consisting of high thermal conductive carbon fiber part and low thermal conductive resin part.