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A ceramic damage model for analyses ...

Lee, Keejoo.

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A ceramic damage model for analyses of multi-layered ceramic-core sandwich panels under blast wave pressure loading.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A ceramic damage model for analyses of multi-layered ceramic-core sandwich panels under blast wave pressure loading./
Author:	Lee, Keejoo.
Description:	179 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2689.
Contained By:	Dissertation Abstracts International66-05B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3175096
ISBN:	0542129841

A ceramic damage model for analyses of multi-layered ceramic-core sandwich panels under blast wave pressure loading.
Lee, Keejoo.

A ceramic damage model for analyses of multi-layered ceramic-core sandwich panels under blast wave pressure loading. - 179 p.

Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2689.

Thesis (Ph.D.)--University of Maryland, College Park, 2005.

A damage model for ceramic materials is developed and incorporated into the geometrically nonlinear solid shell element formulation for dynamic analyses of multi-layered ceramic armor panels under blast wave pressure loading. The damage model takes into account material behaviors observed from multi-axial dynamic tests on Aluminum Nitride (AlN) ceramic. The ceramic fails in a brittle or gradual fashion, depending upon the hydrostatic pressure and applied strain-rate. In the model, the gradual failure is represented by two states: the initial and final failure states. These states are described by two separate failure surfaces that are pressure-dependent and strain-rate-dependent. A scalar damage parameter is defined via using the two failure surfaces, based on the assumption that the local stress state determines material damage and its level. In addition, the damage model accounts for the effect of existing material damage on the new damage.

ISBN: 0542129841Subjects--Topical Terms:

1018395
Engineering, Aerospace.

A ceramic damage model for analyses of multi-layered ceramic-core sandwich panels under blast wave pressure loading.
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008 130610s2005 eng d
020 $a 0542129841
035 $a (UnM)AAI3175096
035 $a AAI3175096
040 $a UnM $c UnM
100 1 $a Lee, Keejoo. $3 1903460
245 1 2 $a A ceramic damage model for analyses of multi-layered ceramic-core sandwich panels under blast wave pressure loading.
300 $a 179 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2689.
500 $a Chair: Sung W. Lee.
502 $a Thesis (Ph.D.)--University of Maryland, College Park, 2005.
520 $a A damage model for ceramic materials is developed and incorporated into the geometrically nonlinear solid shell element formulation for dynamic analyses of multi-layered ceramic armor panels under blast wave pressure loading. The damage model takes into account material behaviors observed from multi-axial dynamic tests on Aluminum Nitride (AlN) ceramic. The ceramic fails in a brittle or gradual fashion, depending upon the hydrostatic pressure and applied strain-rate. In the model, the gradual failure is represented by two states: the initial and final failure states. These states are described by two separate failure surfaces that are pressure-dependent and strain-rate-dependent. A scalar damage parameter is defined via using the two failure surfaces, based on the assumption that the local stress state determines material damage and its level. In addition, the damage model accounts for the effect of existing material damage on the new damage.
520 $a The multi-layered armor panel of interest is comprised of an AlN-core sandwich with unidirectional composite skins and a woven composite back-plate. To accommodate the material damage effect of composite layers, a composite failure model in the open literature is adopted and modified into two separate failure models to address different failure mechanisms of the unidirectional and woven composites. In addition, the effect of strain-rates on the material strengths is incorporated into the composite failure models.
520 $a For finite element modeling, multiple eighteen-node elements are used in the thickness direction to properly describe mechanics of the multi-layered panel. Dynamic analyses of a multi-layered armor panel are conducted under blast wave pressure loadings. The resulting dynamic responses of the panel demonstrate that dynamic analyses that do not take into account material damage and failure significantly under-predict the peak displacement. The under-prediction becomes more pronounced as the blast load level increases. Numerical analyses also indicate that the multi-layered armor design, while tailored for penetration resistance, performs poorly against blast shock wave. An alternative design is proposed and its performance is compared with the original design. Computational modeling of the fundamental material behaviors of ceramics would help expanding the use of ceramics to other structural applications, via enabling designers to efficiently explore design options.
590 $a School code: 0117.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Applied Mechanics. $3 1018410
690 $a 0538
690 $a 0548
690 $a 0346
710 2 0 $a University of Maryland, College Park. $3 657686
773 0 $t Dissertation Abstracts International $g 66-05B.
790 1 0 $a Lee, Sung W., $e advisor
790 $a 0117
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3175096