Development and optimisation of a numerical 3D model for the simulation of a system of non destructive testing for ferromagnetic pipes by the magnetic flux leakage method
type: Dataset
description: The principle of Non Destructive Testing (NDT) by using magnetic flux leakage (MFL) consists to magnetize a magnetic component to be inspected by a strong magnetic field and to detect with a magnetic sensor the magnetic flux lines which are leaking from part due to a defect. MFL methods are usually used during the process of manufacture of ferromagnetic pipes by our partner, the Vallourec Group, the leader in the world in manufacturing of pipes. To improve NDT systems in manufacturing plants, the CEA-LIST and the research center of Vallourec are working together to develop fast simulation tools dedicated to virtual testing of ferromagnetic pipes. The main experimental system concerns the detection of longitudinal defect. The modeling problem is to solve an electromagnetism problem with a complex geometry in the magneto-static nonlinear regime. Eddy currents induced by the motion of the pipe with respect to the magnetizing system are neglected.In this context, a semi-analytical approach based on integral equations (IE) has been chosen. The goal of some works which have been carried out in this PHD thesis is to address 3D complex geometries but, in first a step, limited to the linear regime. However, the non-linear behavior of the relationship which links the magnetic flux density and the magnetic field inside a ferromagnetic material must be considered when choosing the 3D formulation of the problem.After a study about influent parameters of the experimental system, carried out by using finite elements computations, we have considered two strategies for modeling. The first one has consisted to build up a strategy which consists to join the 2D numerical model, existing in the laboratory to an extension model from 2D to 3D. This approach was a priori quite simple but the lack of generality of this approach leads us to suggest another strategy which results in solving the complete 3D magneto-static problem. This formulation is based the integral equation formalism imply…
identifier: NNT: 2013PA112310
issued: 2026-05-06T05:02:16.919126
language: fr
modified: 2026-05-06T05:02:16.919131
contact point: Organization
  fn: CCSD
keyword: 3d
keyword: controle-non-destructive
keyword: flux-de-fuite
keyword: infoeu-reposemanticsdoctoralthesis
keyword: integral-methods
keyword: magnetic-flux-leakage
keyword: methodes-integrals
keyword: methodes-numeriques
keyword: non-destructive-testing
keyword: numerical-methods
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: simulation
keyword: theses
keyword: vallourec
landing page: https://theses.hal.science/tel-00953405

Development and optimisation of a numerical 3D model for the simulation of a system of non destructive testing for ferromagnetic pipes by the magnetic flux leakage method
type: Distribution
format: HTML
issued: 2026-05-06T05:02:16.941099
modified: 2026-05-06T05:02:16.893368
access URL: https://theses.hal.science/tel-00953405

test_moissonnage_selune
type: Agent