[Legacy Report] Modeling and simulation of electromagnetic interactions with complex 3-D structures, with application to the field of non-destructive testing : vTools Events

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[Legacy Report] Modeling and simulation of electromagnetic interactions with complex 3-D structures, with application to the field of non-destructive testing

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The proposed seminar will focus onto the non-destructive evaluation of conductive layered structures in the eddy current (diffusive) realm. Here this means that proper coil probes are placed in air above the structure under testing, eddy currents are generated within it and diffuse in it, defects (cracks, voids) affect their distribution pattern, and consequently anomalous magnetic fields outside it appear, whose measurement should yield pertinent information on the defects (variations of impedances of probes might be the quantity of interest as well). If one wishes to fully understand the observed electromagnetic phenomena, obviously to be able to decipher the observed signals so as to get the sought information on the defects causing them, and possibly to design better probes in order to achieve more effective inspections, one has to develop fast and robust simulation tools of such phenomena. That issue will be discussed in some depth during the exposÃ©. This will involve (after introduction of the challenges faced and some illustrations of them) a description of the pertinent vector integral field formulations employed and associated dyadic Green functions as needed, and effective ways to deal with them. A number of synthetic and experimental results will be proposed as examples. One will then put forth a number of still open questions, with, time permitting, a glimpse also to fast imaging methodologies under study. Potential linkage with joint investigation of anisotropic composite panels carried out by NUS and L2S with support of a French-Singaporean MERLION program, will be pointed out in addition. Notice that most of the material presented in the seminar has been resulting from a close partnership of L2S with the DISC Department of CEA LIST in Saclay and the MEANDER group of the University of West-Macedonia in Kozani, in particular marked by the on-going PhD thesis of R. Miorelli. The said research is also developed inside the so-called CIVAMONT project associating 15+ academic laboratories in Europe within the challenging field of elastic and electromagnetic non-destructive testing.