A Comparison of Dipole and Finite Element Models for Predicting Leakage Fields Around Rectangular Slots in Ferromagnetic Materials.

摘要

This technical report describes computer code generated for the study of dipole and finite element models of magnetic field/defect interactions associated with leagage field methods of nondestructive testing. It is the principal investigator's contention that finite element analysis techniques could be used to develop defect characterization schemes for all electromagnetic methods of nondestructive testing, as well as providing valuable insight into the study of defect signal phenomena. Experimental results are given, showing Hall probe generated leakage field profiles around rectangular slots in a steel bar, and compared with both dipole and finite element model predictions.