Location

La Jolla, CA

Start Date

1-1-1987 12:00 AM

Description

Residual leakage fields are set up around defects in ferromagnetic materials after the active source of d. c. excitation has been removed [1]. Defect detection and characterization then occur by using any flux density sensitive transducer such as magnetic particles, magnetic tape, a moving coil or a Hall element [2]. Past analytical attempts at modeling these phenomena have largely been based on representing simple defect shapes by an equivalent dipole or magnetic charge distribution [3]. In order to examine the effects of realistic defect shapes and material B/H properties, finite element analysis techniques have been used [4,5] to model both active and residual leakage field effects. This paper discusses alternative B/H representations and their impact on the numerical modeling of defect residual leakage fields.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

6B

Chapter

Chapter 8: Materials Characterization

Section

Ferromagnetic Materials

Pages

1651-1658

DOI

10.1007/978-1-4613-1893-4_186

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Residual Leakage Field Modeling

La Jolla, CA

Residual leakage fields are set up around defects in ferromagnetic materials after the active source of d. c. excitation has been removed [1]. Defect detection and characterization then occur by using any flux density sensitive transducer such as magnetic particles, magnetic tape, a moving coil or a Hall element [2]. Past analytical attempts at modeling these phenomena have largely been based on representing simple defect shapes by an equivalent dipole or magnetic charge distribution [3]. In order to examine the effects of realistic defect shapes and material B/H properties, finite element analysis techniques have been used [4,5] to model both active and residual leakage field effects. This paper discusses alternative B/H representations and their impact on the numerical modeling of defect residual leakage fields.