Methodologies for modeling thin layers and displacement in non-destructive testing by eddy currents : application to flexible sensors
type: Dataset
description: The objective of this thesis is the development of modeling tools for eddy current testing (ECT). Currently there is a tendency to use flexible sensors which represent a viable solution for inspecting parts with a complex surface. The main objective of this thesis is the development of techniques for taking into account this kind of sensors within the finite element method (FEM).When modeling a flexible sensor with the FEM, three issues have to be considered. The first one is related to the mesh of thin regions that appear in this kind of configuration (sensor-inspected part distance, thin coating...). The meshing of these regions with simplicial elements can cause numerical problems (distorted elements when a coarse mesh is considered and high number of unknowns when a fine mesh is used). The second issue is related to the displacement of the sensor on the part surface. If the different subdomains (air, part, sensor ...) are properly remeshed for each position of the sensor, the required time can be penalizing. The third issue, related to the modeling of a flexible sensor, is the computation of the current in distorted sensor coils.A comparison of different approaches has led to select the overlapping element method, which allows to simultaneously consider the thin regions with nonconforming meshes. This method allows to perform the connection of two surfaces which can be non-planar and/or have different geometries. The overlapping method has been implemented in two dual formulations (magnetic and electric) in 2D and 3D and integrated in the computation code (C++) DOLMEN of LGEP. The overlapping method has been validated for several kinds of thin regions (air, conductive regions, magnetic regions, flat coils...). The modeling of flexible sensors also requires the establishment of a technique for properly imposing the current in an inductor of arbitrary shape. A technique has been selected and implemented for conventional (volumic) distorted coils but also for flexi…
identifier: NNT: 2012PA112364
issued: 2026-05-15T06:05:48.414527
language: fr
modified: 2026-05-15T06:05:48.414533
contact point: Organization
  fn: CCSD
keyword: capteur-souple
keyword: controle-non-destructif
keyword: courants-de-foucault
keyword: deplacement
keyword: displacement
keyword: eddy-currents
keyword: finite-element-method
keyword: flexible-sensor
keyword: infoeu-reposemanticsdoctoralthesis
keyword: mesh-connection
keyword: methode-des-elements-finis
keyword: methode-overlapping
keyword: non-destructive-testing
keyword: overlapping-finite-element-method
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: recollement-de-maillage
keyword: region-mince
keyword: theses
keyword: thin-regions
landing page: https://theses.hal.science/tel-00776931

Methodologies for modeling thin layers and displacement in non-destructive testing by eddy currents : application to flexible sensors
type: Distribution
format: HTML
issued: 2026-05-15T06:05:48.488464
modified: 2026-05-15T06:05:48.378271
access URL: https://theses.hal.science/tel-00776931

test_moissonnage_selune
type: Agent