A dynamic volt-ampere characteristic test platform of CFRP is established and the dynamic volt-ampere characteristic measurement method of carbon fiber composite is studied to solve the problem of lightning damage mechanism and non-destructive testing of carbon fiber reinforced polymer(CFRP)in aerospace applications. The dynamic voltammetry behavior of CFRP under non-destructive pulsed current is studied by testing the dynamic current flowing through CFRP and the dynamic voltage at both ends. It is found that the amplitude
waveform of impact current and measurement electrode have significant effects on the dynamic voltammetry behavior of CFRP. With the amplitude of impact current increasing
the dynamic voltammetry characteristic curve of CFRP shows a significant upward shift in the current rise phase; the dynamic amplitude of the dynamic voltammetry curve will shift downward until it tends to overlap in the current falling stage. When the wavelength of the impulse current applied to the CFRP becomes longer
it is clearly observed that the surrounded zones by ascent stage and descent stage of the dynamic volt-ampere characteristic of the CFRP becomes smaller. When the measured electrode size increases
the dynamic current amplitude flowed through the CFRP increases by 15%
and the dynamic voltammetry characteristic curve gradually moves down. When the impact current amplitude increases
the dynamic voltammetry characteristic curves with different measured electrodes are getting closer. These results provide a certain experimental basis and theoretical basis for the study of the conductive behavior and the damage mechanism of the carbon fiber composite material in the direct action of the lightning. It also provides a new experimental idea for the non-destructive testing of the carbon fiber composite.
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