I-V characteristics and temperature response of unidirectional CFRP exposed to simulated lightning current in the fiber direction
I-V characteristics and temperature response of unidirectional CFRP exposed to simulated lightning current in the fiber direction
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DOI：
10.1016/j.compositesa.2022.107111
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发表时间：
2022-08-11
影响因子：
8.7
通讯作者：
Ogasawara, Toshio
中科院分区：
文献类型：
--
作者：
Kamiyama, Shintaro;Hirano, Yoshiyasu;Ogasawara, Toshio
本研究通过进行直接导电测试，研究了单向CFRP暴露于模拟雷击电流下的I-V特性和温度响应，该测试可以最大限度地减少来自电弧根部的热通量、复杂电弧行为和冲击波的影响。通过数值分析来阐明加热机理。结果表明：在冲击电流试验下，单向CFRP在纤维方向上的电导率与稳态下的电导率基本一致，在雷电电流增大时趋于恒定；试样的截面观察表明，在CFRP热分解发生的温度范围内，出现了基体裂纹和分层现象。此外，需要考虑热解气的形成能来估计温度响应，估计增韧环氧CFRP的温度响应约为2.163 x 10(7) J/kg。
This study examined the I-V characteristics and temperature response of unidirectional CFRP exposed to simulated lightning current by performing direct electrical conduction tests that could minimize the effects of thermal flux from the arc root, complex arc behavior, and shock wave. A numerical analysis was carried out to clarify the heating mechanisms. The results show that the electrical conductivity of unidirectional CFRP in the fiber direction under impulse current tests is almost identical to that measured in the steady-state and becomes constant during lightning current increasing. Cross-sectional observation of the specimen revealed that matrix cracks and delamination occurred in the temperature range where the CFRP thermal decomposition occurred. In addition, it was necessary to consider the formation energy of the pyrolysis gas to estimate the temperature response, which was estimated to be approximately 2.163 x 10(7) J/kg for the toughened epoxy CFRP.