Finite Element Computational Model for Defect Simulation and Detection by Eddy Currents Non Destructive Testing

Abstract:- This paper presents numerical modelling of eddy currents non-destructive testing in bidimensionnal cylindrical plane. The magnetostatic and magnetodynamic model in term of magnetic vector potential is solved using the finite element method. The displacement of the probe operand in differential mode is simulated with the geometrical band technique based on the physical properties assignment and the impedance change at each position of the probe permit to keep the presence of defect and it influence on the eddy current distribution. A comparison of the results given by the implemented model with experimental ones is in good agreement. Key-Words: – Finite element method, eddy current non-destructive testing, impedance calculating, geometrical band of movement.