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Title: Theoretical and experimental investigation of electromagnetic NDE for defect characterisation
Author: Li, Yong
ISNI:       0000 0004 2670 8242
Awarding Body: University of Newcastle Upon Tyne
Current Institution: University of Newcastle upon Tyne
Date of Award: 2009
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This thesis reports a comprehensive literature survey on Electromagnetic Non-destructive Evaluation (ENDE) and the investigation of forward problems and inverse problems of Sweep-frequency and Pulsed Eddy Current NDE using numerical and analytical modelling in collaboration with an experimental approach. Firstly, Finite Element simulations have been conducted to (1) evaluate and assess the commercial Finite Element simulation packages, COMSOL and ANSOFT MAXWELL EM in terms of feasibility for simulation of ENDE forward problems including Eddy Current and Magnetic Flux Leakage; (2) apply Finite Element modelling as a comparative approach to verify the proposed analytical methods for forward models and inverse schemes. In parallel with the numerical simulations, much more effort is put into implementation of efficient magnetic-field-based Eddy Current modelling, particularly for Sweep-frequency Eddy Current and Pulsed Eddy Current inspections on multilayered structures. The Extended Truncated Region Eigenfunction Expansion (ETREE) method has been proposed and verified. The formulation of closed-form expressions, which are in series of expansions of eigenfunctions, is useful to rapidly predict signals from solid-state magnetic field sensors rather than the traditional impedance signals measured using induction coils, as the dimension of sensors is taken into account in the model.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available