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Dynamic buckling of structural eleme...

Vaughn, Denzil Gurth.

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Dynamic buckling of structural elements under high velocity loading.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Dynamic buckling of structural elements under high velocity loading./
Author:	Vaughn, Denzil Gurth.
Description:	103 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2667.
Contained By:	Dissertation Abstracts International66-05B.
Subject:	Applied Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3174062
ISBN:	0542119811

Dynamic buckling of structural elements under high velocity loading.
Vaughn, Denzil Gurth.

Dynamic buckling of structural elements under high velocity loading. - 103 p.

Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2667.

Thesis (Ph.D.)--Harvard University, 2005.

The plastic buckling of columns is explored in a regime where plastic wave propagation and lateral buckling are nonlinearly coupled. The time scale associated with dynamic axial behavior, wherein deformation spreads along the column as a plastic wave, is comparable to the time scale associated with lateral buckling such that the two phenomena are coupled. Underlying the work is the motivation to understand and quantify the dynamic crushing resistance of truss cores of all-metal sandwich plates where each truss member is a clamped column. While members of sandwich plates are fairly stocky, relatively slender columns are explored here as well. Members that are fairly stocky buckle plastically and their load carrying capacity decreases gradually as they buckle, even at slow loading rates. In the range of elevated loading rates of interest here, these columns are significantly stabilized by lateral inertia, resisting lateral motion and delaying buckling and loss of load carrying capacity to relatively large overall plastic strains. The analysis of slender columns reveals the importance of the relevant material and geometric parameters on dynamic buckling and the substantial role of inertia in buckling retardation. The stress in the column is sensitive to the location of the plastic wave and the boundary condition away from the impacted end. To alleviate the dependence of this boundary, a mathematical model is developed wherein the propagating wave front is a moving boundary of a column which is also buckling. Several other relevant problems are analyzed using a combination of analytical and numerical procedures. In some cases, material strain-rate dependence is also taken into account. Detailed finite element analyses are performed for axially loaded columns with initial imperfections, as well as for inclined columns in a truss core of a sandwich plate, with the aim of determining the resistance of the column to deformation as dependent on the loading rate and the relevant material and geometric parameters. In the range of loading rates of interest, dynamic effects result in substantial increases in the reaction forces exerted by core members on the faces of the sandwich plate with significant elevation in energy absorption. In addition, comparison with dynamic experiments on truss cores reveals the robustness of the finite element model.

ISBN: 0542119811Subjects--Topical Terms:

1018410
Applied Mechanics.

Dynamic buckling of structural elements under high velocity loading.
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100 1 $a Vaughn, Denzil Gurth. $3 1904200
245 1 0 $a Dynamic buckling of structural elements under high velocity loading.
300 $a 103 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2667.
500 $a Adviser: John W. Hutchinson.
502 $a Thesis (Ph.D.)--Harvard University, 2005.
520 $a The plastic buckling of columns is explored in a regime where plastic wave propagation and lateral buckling are nonlinearly coupled. The time scale associated with dynamic axial behavior, wherein deformation spreads along the column as a plastic wave, is comparable to the time scale associated with lateral buckling such that the two phenomena are coupled. Underlying the work is the motivation to understand and quantify the dynamic crushing resistance of truss cores of all-metal sandwich plates where each truss member is a clamped column. While members of sandwich plates are fairly stocky, relatively slender columns are explored here as well. Members that are fairly stocky buckle plastically and their load carrying capacity decreases gradually as they buckle, even at slow loading rates. In the range of elevated loading rates of interest here, these columns are significantly stabilized by lateral inertia, resisting lateral motion and delaying buckling and loss of load carrying capacity to relatively large overall plastic strains. The analysis of slender columns reveals the importance of the relevant material and geometric parameters on dynamic buckling and the substantial role of inertia in buckling retardation. The stress in the column is sensitive to the location of the plastic wave and the boundary condition away from the impacted end. To alleviate the dependence of this boundary, a mathematical model is developed wherein the propagating wave front is a moving boundary of a column which is also buckling. Several other relevant problems are analyzed using a combination of analytical and numerical procedures. In some cases, material strain-rate dependence is also taken into account. Detailed finite element analyses are performed for axially loaded columns with initial imperfections, as well as for inclined columns in a truss core of a sandwich plate, with the aim of determining the resistance of the column to deformation as dependent on the loading rate and the relevant material and geometric parameters. In the range of loading rates of interest, dynamic effects result in substantial increases in the reaction forces exerted by core members on the faces of the sandwich plate with significant elevation in energy absorption. In addition, comparison with dynamic experiments on truss cores reveals the robustness of the finite element model.
590 $a School code: 0084.
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0346
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710 2 0 $a Harvard University. $3 528741
773 0 $t Dissertation Abstracts International $g 66-05B.
790 1 0 $a Hutchinson, John W., $e advisor
790 $a 0084
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3174062