Semi-analytical modeling of eddy current inspection of stratified and homogenized composite materials

摘要

In the present paper, we deal with the development of a semi-analytical model for the fast computation of a quasi-static field induced by a 3D eddy current probe in a flawless composite material. After a prior phase of homogenization, the workpiece is assumed to be homogenized and stratified. Therefore, each layer of the material is characterized by a conductivity tensor with axial or biaxial form according to the main orientation of the fibers. The approach is based on a modal decomposition of the Electromagnetic (EM) field in each layer. To take into account the wave propagation through the multilayered structure and boundary conditions at each interface, a recursive scattering matrix (S-matrix) algorithm is implemented. Numerical results provided by the model are compared to other simulated data obtained by a Finite Element commercial software.