AN EQUIVALENT LINEAR-MODEL FOR MAGNETOSTATIC NONDESTRUCTIVE EVALUATION

Citation
Zr. Zhang et al., AN EQUIVALENT LINEAR-MODEL FOR MAGNETOSTATIC NONDESTRUCTIVE EVALUATION, IEEE transactions on magnetics, 32(3), 1996, pp. 718-721
Citations number
3
Categorie Soggetti
Engineering, Eletrical & Electronic","Physics, Applied
ISSN journal
00189464
Volume
32
Issue
3
Year of publication
1996
Pages
718 - 721
Database
ISI
SICI code
0018-9464(1996)32:3<718:AELFMN>2.0.ZU;2-O
Abstract
Numerical models capable of modeling magnetic flux leakage (MFL) metho ds of nondestructive testing are of significant interest to industry. The nonlinear nature of the MFL problem necessitates the use of an ite rative model, thereby resulting in excessive computational effort. Thi s paper describes an approach for developing an equivalent linear mode l (ELM) where the ferromagnetic region is appropriately partitioned in to different domains with each domain being assigned a constant permea bility value depending on the magnetization level and the flaw size. T he nonlinear behavior of the multi-layered object is then modeled usin g a linear MFL model. The strategy results in significant computationa l savings without a substantial loss in accuracy. Results supporting t he validity of the approach have been obtained using a 3D magnetostati c finite element (FE) model.