Three dimensional hybrid finite-boundary element model for eddy current NDE

A three-dimensional hybrid finite-boundary element formulation of eddy current nondestructive evaluation (NDE) is presented. The vector potential formulation considered is suitable for combining the boundary-element method (BEM) and finite-element method (FEM), because the linking conditions are expressed by the tangential component of the magnetic field for both methods. Even though there are four unknowns in the FEM formulation, it is attractive because it is easily implemented. The uniqueness of the vector potential is guaranteed and regions with different conductivities or nonlinear permeability can be modeled. The results indicate the feasibility of using the formulation for 3-D eddy current NDE applications