In order to study the direct effect of carbon fiber reinforcement plastic (CFRP) material by lightning current destroy, damage experiment and analysis have been investigated in this paper. CFRP laminate damage is tested under different artificial lightning waveform with same peak value and different peak value with same rise-time and half-width, respectively. The influence of lightning parameters to destroy area is analyzed and damage behavior is concluded. Damage area of CFRP laminates after artificial lightning destroy is detected by nondestructive ultrasonic C-scan testing. This research can provide some basic data for aircraft lightning protection designers.

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A modified impedance network boundary condition (INBC) is proposed for modeling electrically thin conductive layers (TCLs) under plane wave incidence in finite-difference time-domain (FDTD) method. Compared to the conventional INBC which represents the relationship between the electric and the magnetic fields collocated at two faces of the TCL, the modified INBC takes into consideration both the half-space-cell and half-time-step difference of the electric and the magnetic fields in Yee's grid. The primary advantage of the modified INBC is that it can be implemented in conventional FDTD algorithm without half-cell shift approximation. Numerical examples are presented to validate the efficiency and accuracy of the proposed method in analyzing thin layers with low conductivities.

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For modeling of electrically thin conductive shields, the unconditionally stable Associated Hermite (AH) FDTD scheme is combined with the impedance network boundary conditions (INBCs) in this paper. The two-port network equations of INBCs in frequency domain are transformed into AH domain to represent the relationship of tangential components of the electric and magnetic fields at faces of the shield. The established AH-INBCs shielding boundaries are incorporated into a set of implicit equations to calculate the expansion coefficients vectors of electromagnetic fields in the computational domain. The method is free of CFL condition and no convolution integral operation for solving the conventional INBCs-FDTD is involved. Numerical example shows that, compared with analytical solutions and conventional FDTD method, the proposed algorithm is efficient and accurate.