Research on electro-thermal damage characteristics of aircraft composite fuel tank skin after lightning strike

doi:10.19936/j.cnki.2096-8000.20210928.010

Abstract

Abstract: With the extensive use of carbon fiber-reinforced polymer (CFRP) in modern aircraft, due to the anisotropy of CFRP's electrical conductivity and heat transfer coefficient, its temperature distribution is different from traditional metal materials after lightning strike. In order to explore the electro-thermal damage characteristics of CFRP fuel tanks for lightning protection, this paper uses COMSOL Multiphysics simulation software to establish a CFRP laminate and flame sprayed aluminum protection CFRP laminate to simulate a fuel tank skin model for simulation research, and develop a typical lightning current combination waveform lightning current the injection test verifies the simulation results. The results show that after the lightning current waveform is injected, for the unprotected CFRP board, the temperature of each layer is distributed along the fiber direction. For the flame sprayed aluminum protection CFRP board, the temperature is approximately circular, and the high temperature damage area and damage depth are both smaller than non-protective CFRP board. The surface temperature is greatly affected by the lightning current D wave, while the damage depth is greatly affected by the B and C^* waves. After the lightning waveform injection is completed, the heat generated by the lightning strike will be conducted downwards along the CFRP layer, the hot spot causes the bottom surface temperature to rise but does not exceed 200 ℃ under the condition of 2.6 mm thickness. The use of flame sprayed aluminum can have a good lightning protection effect on the CFRP fuel tank.

Key words: CFRP, anisotropy, fuel tank, electro-thermal damage, lightning protection

CLC Number:

TB332

HU Jing, WU Tian-hang, GONG Han-lin, LI Zhi-bao, LI Xiao-er, SI Xiao-liang. Research on electro-thermal damage characteristics of aircraft composite fuel tank skin after lightning strike[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(9): 68-73.

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