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PULSED EDDY CURRENT RESPONSE OF LINE...

ELHABASHI, SAYEH MOHAMED.

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PULSED EDDY CURRENT RESPONSE OF LINE DEFECTS (NONDESTRUCTIVE TESTING).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	PULSED EDDY CURRENT RESPONSE OF LINE DEFECTS (NONDESTRUCTIVE TESTING)./
作者:	ELHABASHI, SAYEH MOHAMED.
面頁冊數:	187 p.
附註:	Source: Dissertation Abstracts International, Volume: 47-03, Section: B, page: 1110.
Contained By:	Dissertation Abstracts International47-03B.
標題:	Physics, Electricity and Magnetism. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8611735

PULSED EDDY CURRENT RESPONSE OF LINE DEFECTS (NONDESTRUCTIVE TESTING).
ELHABASHI, SAYEH MOHAMED.

PULSED EDDY CURRENT RESPONSE OF LINE DEFECTS (NONDESTRUCTIVE TESTING). - 187 p.

Source: Dissertation Abstracts International, Volume: 47-03, Section: B, page: 1110.

Thesis (Ph.D.)--University of Missouri - Columbia, 1985.

The ability to detect and characterize unknown defects in metals using the pulsed eddy current method of nondestructive testing is very limited due to the lack of an adequate theoretical modeling approach. This dissertation introduces a theoretical modeling approach and applies it to the case of horizontal and vertical line defects inside a nonmagnetic metal when a normal magnetic field which is exponentially decaying with space and impulsive with time is applied on the metal surface and when it is out of the aperature of a masked probe. The analyses were in Laplace form from which the transient fields in the time domain in an integral form were obtained and evaluated for some parameters of the defect. Some results for the horizontal line defect were compared with experimental data from the literature, and they were close.Subjects--Topical Terms:

1019535
Physics, Electricity and Magnetism.

PULSED EDDY CURRENT RESPONSE OF LINE DEFECTS (NONDESTRUCTIVE TESTING).
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100 1 $a ELHABASHI, SAYEH MOHAMED. $3 1926258
245 1 0 $a PULSED EDDY CURRENT RESPONSE OF LINE DEFECTS (NONDESTRUCTIVE TESTING).
300 $a 187 p.
500 $a Source: Dissertation Abstracts International, Volume: 47-03, Section: B, page: 1110.
502 $a Thesis (Ph.D.)--University of Missouri - Columbia, 1985.
520 $a The ability to detect and characterize unknown defects in metals using the pulsed eddy current method of nondestructive testing is very limited due to the lack of an adequate theoretical modeling approach. This dissertation introduces a theoretical modeling approach and applies it to the case of horizontal and vertical line defects inside a nonmagnetic metal when a normal magnetic field which is exponentially decaying with space and impulsive with time is applied on the metal surface and when it is out of the aperature of a masked probe. The analyses were in Laplace form from which the transient fields in the time domain in an integral form were obtained and evaluated for some parameters of the defect. Some results for the horizontal line defect were compared with experimental data from the literature, and they were close.
520 $a This approach can be outlined in three steps: (1) Assuming that there is a surface current density which is constant with space and impulse with time having the orientation and geometry of the defect at the defect position, the fields in the metal and air due to this current density can be found as a function of space and time. (2) Assuming that the test field is applied to a defect free metal, the electric and magnetic fields inside the metal can also be found. The electric current density that actually flows on the defect surface is the electric field tangent to the defect which may be approximated by the electric field in a defect free metal times the conductivity of the metal, and this may be further approximated by the average electric current density over the defect times its length (surface area or volume). (3) Information about the defect can be extracted from the fields obtained from the time convolution of the fields from step 1 with the current density from step 2.
590 $a School code: 0133.
650 4 $a Physics, Electricity and Magnetism. $3 1019535
690 $a 0607
710 2 0 $a University of Missouri - Columbia. $3 1017522
773 0 $t Dissertation Abstracts International $g 47-03B.
790 $a 0133
791 $a Ph.D.
792 $a 1985
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8611735