Measurement of 3D thermal diffusivity distribution with lock-in thermography and application for high thermal conductivity CFRPs
Measurement of 3D thermal diffusivity distribution with lock-in thermography and application for high thermal conductivity CFRPs
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DOI：
10.1016/j.infrared.2019.04.023
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发表时间：
2019-06-01
影响因子：
3.3
通讯作者：
Nagano, H.
中科院分区：
文献类型：
--
作者：
Ishizaki, T.;Nagano, H.
本文提出了一种利用激光光斑周期加热法利用锁定热像仪测量详细的三维热扩散率的新技术。利用锁相式热成像技术，可以得到面内和面外的热扩散率分布。首先，以纯金属、各向同性石墨和陶瓷为参比材料，验证了测量方法和原理的有效性。结果表明，面内和面外的热扩散系数分别与推荐值一致。其次，对高导热碳纤维增强塑料(CFRP)样品进行了三维热扩散率测量。对单向碳纤维单向铺层(UD)和正交双向碳纤维交叉铺设(CP)两种类型的CFRP试件进行了测试。结果表明，UD样品只在纤维方向具有极高的热扩散率。另一方面，通过测量和热分析推断，CP样品的结果具有较高的各向同性平面内热扩散率分布。
This paper presents a new technique for measuring detailed three-dimensional thermal diffusivity by the laser-spot-periodic-heating-method using lock-in thermography. Using lock-in thermography, the in-plane thermal diffusivity distribution and out-of-plane thermal diffusivity distribution could be obtained. First, the validity of the measurement method and principle were confirmed using pure metal, isotropic graphite, and a ceramic as reference materials. As a result, the in- and out-of-plane thermal diffusivities coincided with the recommended value, respectively. Next, the three-dimensional thermal diffusivity measurement was applied for high thermal conductivity carbon-fiber-reinforced plastic (CFRP) samples. The two types of CFRP sample, unidirectional (UD) with unidirectional carbon fibers and cross-ply (CP) with orthogonal two-directional carbon fibers, were measured. As a result, it was revealed that UD sample had extremely high thermal diffusivity in the fiber direction only. On the other hand, it was inferred by measurement and by thermal analysis that the result of CP sample had a high, isotropic, in-plane thermal diffusivity distribution.