Location

Seattle, WA

Start Date

1-1-1996 12:00 AM

Description

Numerical models simulating magnetic flux leakage (MFL) phenomenon in ferromagnetic materials are nonlinear in nature and hence require excessive computational effort. This paper describes an approach for developing an equivalent linear model (ELM) where the ferromagnetic region is appropriately partitioned into different domains with each domain being assigned a constant permeability value depending on the magnetization level and the flaw size. The nonlinear behavior of the multi-layered object is then modeled using a linearized MFL model. The model is first validated and then applied to the flaw detection problem in a rail geometry.

Volume

15A

Chapter

Chapter 1: Standard Techniques

Section

Magnetic Models

Pages

553-560

DOI

10.1007/978-1-4613-0383-1_71

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Linearized MFL Model for Embedded Flaw Detection in Rails

Seattle, WA

Numerical models simulating magnetic flux leakage (MFL) phenomenon in ferromagnetic materials are nonlinear in nature and hence require excessive computational effort. This paper describes an approach for developing an equivalent linear model (ELM) where the ferromagnetic region is appropriately partitioned into different domains with each domain being assigned a constant permeability value depending on the magnetization level and the flaw size. The nonlinear behavior of the multi-layered object is then modeled using a linearized MFL model. The model is first validated and then applied to the flaw detection problem in a rail geometry.