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Shock wave interactions at explosive...

Baird, Jason.

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Shock wave interactions at explosive/metallic interfaces.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Shock wave interactions at explosive/metallic interfaces./
Author:	Baird, Jason.
Description:	200 p.
Notes:	Adviser: Paul N. Worsey.
Contained By:	Dissertation Abstracts International62-04B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3013200
ISBN:	049323148X

Shock wave interactions at explosive/metallic interfaces.
Baird, Jason.

Shock wave interactions at explosive/metallic interfaces. - 200 p.

Adviser: Paul N. Worsey.

Thesis (Ph.D.)--University of Missouri - Rolla, 2001.

Metallic tubes filled with C-4 high-explosive and constructed of either aluminum or copper were tested during this study of high strain rate effects within thin metal cylinders performed as an adjunct to helical flux-compression generator research at the University of Missouri-Rolla. This study directly affects the understanding of flux cut-off and high strain-rate changes in an expanding metal cylinder (the armature of a flux-compression generator) as part of the explosive-driven generator study. In this study, premature longitudinal cracks characteristically developed in the outer surface of the armature tubing at a much smaller expansion ratio than predicted by theory. These cracks occurred within about two diameters of the armature end containing the detonator, but the cracks did not extend as would be expected when the tubing expanded under explosive pressurization. Such cracks are a cause of magnetic flux cut-off in generators, and such flux losses seriously affect generators' energy conversion efficiency. Energy, timing, and structural analyses were performed which showed that detonation pressurization was not the cause of the premature fracturing. Shock wave effects were examined, and found to be the cause of the fracturing. Numerical modeling was performed utilizing a two-dimensional Lagrangian finite-difference technique to analyze the effect of the explosive detonation wave on the armature metallic structure. When the explosive charge is initiated, the detonation wave which results is compressive, and the shock waves resulting from its transmission into a thin metal armature cause both compressive and tensile regions, posing an extremely complex stress field within the cylinder and causing low-cycle fatigue in the structure. This stress field directly affects how the tube structure fractures when it is impulsively loaded by high pressure gases as a result of the detonation. The end result is that shock wave effects can be isolated during generator operation, given proper generator design and construction, allowing for more efficient generators in practice.

ISBN: 049323148XSubjects--Topical Terms:

783786
Engineering, Mechanical.

Shock wave interactions at explosive/metallic interfaces.
LDR:02989nam 2200289 a 45 001 932562
005 20110505
008 110505s2001 eng d
020 $a 049323148X
035 $a (UnM)AAI3013200
035 $a AAI3013200
040 $a UnM $c UnM
100 1 $a Baird, Jason. $3 1256302
245 1 0 $a Shock wave interactions at explosive/metallic interfaces.
300 $a 200 p.
500 $a Adviser: Paul N. Worsey.
500 $a Source: Dissertation Abstracts International, Volume: 62-04, Section: B, page: 1921.
502 $a Thesis (Ph.D.)--University of Missouri - Rolla, 2001.
520 $a Metallic tubes filled with C-4 high-explosive and constructed of either aluminum or copper were tested during this study of high strain rate effects within thin metal cylinders performed as an adjunct to helical flux-compression generator research at the University of Missouri-Rolla. This study directly affects the understanding of flux cut-off and high strain-rate changes in an expanding metal cylinder (the armature of a flux-compression generator) as part of the explosive-driven generator study. In this study, premature longitudinal cracks characteristically developed in the outer surface of the armature tubing at a much smaller expansion ratio than predicted by theory. These cracks occurred within about two diameters of the armature end containing the detonator, but the cracks did not extend as would be expected when the tubing expanded under explosive pressurization. Such cracks are a cause of magnetic flux cut-off in generators, and such flux losses seriously affect generators' energy conversion efficiency. Energy, timing, and structural analyses were performed which showed that detonation pressurization was not the cause of the premature fracturing. Shock wave effects were examined, and found to be the cause of the fracturing. Numerical modeling was performed utilizing a two-dimensional Lagrangian finite-difference technique to analyze the effect of the explosive detonation wave on the armature metallic structure. When the explosive charge is initiated, the detonation wave which results is compressive, and the shock waves resulting from its transmission into a thin metal armature cause both compressive and tensile regions, posing an extremely complex stress field within the cylinder and causing low-cycle fatigue in the structure. This stress field directly affects how the tube structure fractures when it is impulsively loaded by high pressure gases as a result of the detonation. The end result is that shock wave effects can be isolated during generator operation, given proper generator design and construction, allowing for more efficient generators in practice.
590 $a School code: 0135.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Mining. $3 1035560
650 4 $a Physics, Fluid and Plasma. $3 1018402
690 $a 0548
690 $a 0551
690 $a 0759
710 2 0 $a University of Missouri - Rolla. $3 1025712
773 0 $t Dissertation Abstracts International $g 62-04B.
790 $a 0135
790 1 0 $a Worsey, Paul N., $e advisor
791 $a Ph.D.
792 $a 2001
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3013200