碳纤维增强型复合材料在非破坏雷电流脉冲下的动态导电特性

To obtain the dynamic electrical properties of carbon fiber reinforced polymer (CFRP) laminates subjected to a lightning current impulse, an experimental platform generating lightning current impulses of 10/30, 20/60 and 40/120 μs is constructed. The conduction mechanism of CFRP laminates and the effects of layer structure, sample clamping schedule and applied lightning impulse parameters on the dynamic electrical properties of CFRP are analyzed. The experimental results indicate that the in-thickness conductivity (10^-3 S/mm) gets much smaller than the in-plane conductivity (10⁰ S/mm) under the effect of lightning current of 100-1 000 A due to the anisotropic nonlinear conductivity affected by the internal layup structure of CFRP laminates. In addition, the voltage of CFRP sample reaches the peak value prior to the impulse current, the dynamic conductivity of CFRP laminates increases with the reduced rising rate and increasing duration of applied lightning current and the inductance properties of CFRP laminates closely relate to the inductive effect of carbon fibers. The dynamic electrical properties and conduction model of CFRP laminates subjected to a lightning impulse can provide theoretical supports for the establishment of the thermo-electric coupling model of CFRP lightning direct effect, optimization and improvement of CFRP materials.