3D movement simulation technique in FVM method application to eddy current non destructive testing

Abstract

PurposeThe purpose of this paper is to propose modelling 3D eddy current non destructive testing (EC NDT) problems by the finite volume method (FVM). Furthermore, the movement of the probe coil is taken into account.Design/methodology/approachThe nonconforming mesh technique is used to handle the displacement of the probe coil. Thus, the whole problem is divided into two parts; moving part (probe coil) and fixed part (specimen with crack), and then each part meshes independently. A computer code is built under Matlab program to generate 3D nonconforming mesh, to calculate magnetic and electric potentials and to evaluate the impedance change of the coil due to the presence of the crack.FindingsThe JSAEM No. 6 problem is used to test the proposed method. The calculated values of the impedance change of the probe coil due to the presence of crack, shows the efficiency of the developed software. A small difference is obtained between calculated values and measured values.Originality/valueThe paper introduces the FVM in solving EC NDT problems where the probe displacement is taken into account.

3D Finite Volume Modeling of ENDE Using ElectromagneticT-Formulation

“…As introduced in [1,4], the principle of the FVM method is to divide the whole domain into discrete control volume. The surfaces of control volume are positioned midway between adjacent points.…”

“…Originally, the FVM was extensively used in solving the dynamic fluid problems [1,2]. Since the beginning of the eighties, it has been introduced for the solution of Maxwell's equations, precisely in wave propagation domain [3,4]. In 2001, the FVM was presented as a new method to investigate the eddy current distribution problems from the teamwork problem 21 [5].…”

“…Similarly, a model of 3D eddy current nondestructive testing (NDT) problems by FVM method is presented for benchmark problem JSAEM No. 6 and furthermore, the movement of the probe coil is taken into account thanks to the nonconforming mesh generation [4]. However, the problem domain should be remeshed when the position of the coil is changed.…”

The Finite Volume Method an Alternative Method for LF Electromagnetic Problems

“…For 3D LF electromagnetic problems, note that the FVM method has been already developed where a simple hexahedral volume element is used [16,17] (Figure 1 As well, for 2D LF electromagnetic problems, a simple rectangular control volume is usually associated to the FVM [18]. Furthermore, to give more flexibility to the FVM to analyze more complex geometries in the 2D case, this paper proposes in addition a 2D unstructured FVM by making use of triangular mesh.…”

Skin effect based technique in eddy current non‐destructive testing for thickness measurement of conductive material

“…However, this study proposes the investigation of the skin effect phenomenon for metallic plate thickness measurement, in which both 3D numerical modelling using the finite volume method (FVM) [14] and experimental analysis are considered. Since the proposed material and its thickness measurement must be recognised in terms of its electrical conductivity, two methods are used for its identification.…”