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THREE-DIMENSIONAL FINITE ELEMENT MOD...

IDA, NATHAN.

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THREE-DIMENSIONAL FINITE ELEMENT MODELING OF ELECTROMAGNETIC NONDESTRUCTIVE TESTING PHENOMENA.

Record Type:	Electronic resources : Monograph/item
Title/Author:	THREE-DIMENSIONAL FINITE ELEMENT MODELING OF ELECTROMAGNETIC NONDESTRUCTIVE TESTING PHENOMENA./
Author:	IDA, NATHAN.
Description:	291 p.
Notes:	Source: Dissertation Abstracts International, Volume: 44-04, Section: B, page: 1158.
Contained By:	Dissertation Abstracts International44-04B.
Subject:	Physics, Electricity and Magnetism. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8317804

THREE-DIMENSIONAL FINITE ELEMENT MODELING OF ELECTROMAGNETIC NONDESTRUCTIVE TESTING PHENOMENA.
IDA, NATHAN.

THREE-DIMENSIONAL FINITE ELEMENT MODELING OF ELECTROMAGNETIC NONDESTRUCTIVE TESTING PHENOMENA. - 291 p.

Source: Dissertation Abstracts International, Volume: 44-04, Section: B, page: 1158.

Thesis (Ph.D.)--Colorado State University, 1983.

Electromagnetic methods of nondestructive testing are widely used in various industries for characterization of material properties and detection of flaws. These methods are based on measurable changes in the electrical and magnetic properties of materials caused by the interaction with applied and induced fields. Analytical approaches to the modeling of electromagnetic field/defect interaction have largely been unsuccessful due to the awkward boundaries of realistic three dimensional defects and the need for simplifying assumptions. General theoretical models are needed, capable of handling complicated test geometries in order to understand the physics of field interactions with defects, to simulate testing situations which are difficult and/or expensive to replicate and to provide training data for automated defect characterization schemes. Numerical models based on a finite element formulation of the classical Maxwell's equations have the ability to overcome these difficulties.Subjects--Topical Terms:

1019535
Physics, Electricity and Magnetism.

THREE-DIMENSIONAL FINITE ELEMENT MODELING OF ELECTROMAGNETIC NONDESTRUCTIVE TESTING PHENOMENA.
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100 1 $a IDA, NATHAN. $3 1926253
245 1 0 $a THREE-DIMENSIONAL FINITE ELEMENT MODELING OF ELECTROMAGNETIC NONDESTRUCTIVE TESTING PHENOMENA.
300 $a 291 p.
500 $a Source: Dissertation Abstracts International, Volume: 44-04, Section: B, page: 1158.
502 $a Thesis (Ph.D.)--Colorado State University, 1983.
520 $a Electromagnetic methods of nondestructive testing are widely used in various industries for characterization of material properties and detection of flaws. These methods are based on measurable changes in the electrical and magnetic properties of materials caused by the interaction with applied and induced fields. Analytical approaches to the modeling of electromagnetic field/defect interaction have largely been unsuccessful due to the awkward boundaries of realistic three dimensional defects and the need for simplifying assumptions. General theoretical models are needed, capable of handling complicated test geometries in order to understand the physics of field interactions with defects, to simulate testing situations which are difficult and/or expensive to replicate and to provide training data for automated defect characterization schemes. Numerical models based on a finite element formulation of the classical Maxwell's equations have the ability to overcome these difficulties.
520 $a This thesis describes the three dimensional finite element formulation of the magnetostatic and eddy current equations and its use in theoretically modeling leakage fields and impedances of eddy current probes in the presence of three dimensional defects. The formulation is based on an energy balance concept, resulting in a system of linear equations. These equations are solved for the magnetic vector potential from which other quantities such as flux densities and probe impedances are calculated. The model presented can accomodate spatial nonlinearities but not field dependence of permeability.
520 $a The validity of the numerical model is established by comparison with two dimensional, finite element solutions and to experimental data. The method is applied to predict leakage field profiles from defects in steel bars and eddy current probe impedances in geometries relating to nuclear power plant steam generators. The errors encountered in these calculations are mainly due to limitations on computer resources but the feasibility of using the numerical model for static and moving eddy current probe calculations and for magnetostatic leakage fields is established. This numerical model can predict the signal from any test situation and therefore can be used both as a training tool for test development and signal processing and the understanding of field/defect interactions.
590 $a School code: 0053.
650 4 $a Physics, Electricity and Magnetism. $3 1019535
690 $a 0607
710 2 0 $a Colorado State University. $3 675646
773 0 $t Dissertation Abstracts International $g 44-04B.
790 $a 0053
791 $a Ph.D.
792 $a 1983
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8317804