Investigation of layer interface model of multi-layer structure using semi-analytical and FEM analysis for eddy current pulsed thermography

The use of a multi-layer structure is widely recognized in aerospace engineering due to the fact that structural and functional properties can be implemented by designing geometric structure. Eddy current pulsed thermography (ECPT) is one of the crucial NDT techniques to inspect and evaluate the defects in composite multi-layer structure due to the volumetric heating nature. Thus, it is important to investigate the scattering electromagnetic wave into the interface of multi-layer structure to improve the detectability and evaluation capbility of an ECPT system. In this work, the conductivity tensor form is used to describe the scattering EM wave in the 3D FEM model to investigate the fiber orientation influence on each layer interface. The semi-analytical model is used to prove the concept and both results are validated by experimental studies with dedicated samples. The findings can be applied for simulating the scattering electromagnetic behavior in the interface of the multi-layer structure.