The Advanced Nondestructive Evaluation (NDE) Sensor Modeling for Multisite Inspection program has developed finite element models (FEM) of electromagnetic NDE for optimizing the inspection of aging aircraft structure. The program found excellent correlation between magnetic field strengths predicted by FEM analysis and experimental values in fastened airframe structure configurations. Applying the FEM analysis to magnetoresistive (MR) sensors inspection problems then provided useful insights into the many parameter effects associated with ...
A new formulation using the reduced magnetic vector potential and the electric scalar potential is proposed for modeling of eddy current (EC) problems using finite element analysis. The major advantage of the proposed formulation is that it eliminates the need for meshing the current source. In EC nondestructive testing the probe coil scans across the sample which involves motion of the coil. Simulation of EC scans in conventional finite element ...
This paper presents improvements made to enhance the Element-Free Galerkin method (EFG) for NDE applications. By using orthogonal basis functions instead of the conventional polynomial basis, the inversion of the ill-conditioned shape function matrix is eliminated. Therefore, the accuracy of the results is improved. Preliminary one-dimensional (1-D) and two-dimensional (2-D) examples are presented to demonstrate the improvement in accuracy and efficiency offered by orthogonal basis functions.
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