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Computational modeling of damage in ...

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Computational modeling of damage in brittle materials.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Computational modeling of damage in brittle materials./
Author:	Kraft, Reuben H.
Description:	164 p.
Notes:	Adviser: Lori Graham-Brady.
Contained By:	Dissertation Abstracts International69-04B.
Subject:	Applied Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3309697
ISBN:	9780549582243

Computational modeling of damage in brittle materials.
Kraft, Reuben H.

Computational modeling of damage in brittle materials. - 164 p.

Adviser: Lori Graham-Brady.

Thesis (Ph.D.)--The Johns Hopkins University, 2008.

The failure of brittle materials is a complex process and provides a unique challenge for the modeling community. In an effort to understand the mechanical response of these materials, this thesis uses a micromechanically-based computational approach. The response of a polycrystalline ceramic subjected to dynamic compressive loading is first investigated using a two-dimensional finite element model of the microstructure. Intergranular cracking is captured explicitly by using a distribution of cohesive interfaces. The mesoscopic response of the ceramic is interpreted in terms of the evolution of microcrack growth and coalescence while examining the effects of confinement, friction, rate-of-deformation, and distribution of flaws.

ISBN: 9780549582243Subjects--Topical Terms:

1018410
Applied Mechanics.

Computational modeling of damage in brittle materials.
LDR:03019nam 2200313 a 45 001 856688
005 20100709
008 100709s2008 ||||||||||||||||| ||eng d
020 $a 9780549582243
035 $a (UMI)AAI3309697
035 $a AAI3309697
040 $a UMI $c UMI
100 1 $a Kraft, Reuben H. $3 1023535
245 1 0 $a Computational modeling of damage in brittle materials.
300 $a 164 p.
500 $a Adviser: Lori Graham-Brady.
500 $a Source: Dissertation Abstracts International, Volume: 69-04, Section: B, page: 2404.
502 $a Thesis (Ph.D.)--The Johns Hopkins University, 2008.
520 $a The failure of brittle materials is a complex process and provides a unique challenge for the modeling community. In an effort to understand the mechanical response of these materials, this thesis uses a micromechanically-based computational approach. The response of a polycrystalline ceramic subjected to dynamic compressive loading is first investigated using a two-dimensional finite element model of the microstructure. Intergranular cracking is captured explicitly by using a distribution of cohesive interfaces. The mesoscopic response of the ceramic is interpreted in terms of the evolution of microcrack growth and coalescence while examining the effects of confinement, friction, rate-of-deformation, and distribution of flaws.
520 $a Next, a new computational method to simulate transgranular cracking is developed and applied in order to gain insight into how fracture mechanisms control mesoscopic strength and toughness of brittle ceramics. The effects of various grain boundary distributions and the resulting modes of fracture under tensile loading are quantitatively examined. Results are gathered from twenty different simulations, each using a different microstructure in an attempt to capture the stochastic nature of brittle materials. It is observed that the grain boundary distribution has profound effects on mesoscopically observed values, which are in part controlled by the crack propagation path. Based on observations of the simulated crack path, microstructural engineering with respect to grain morphology is predicted to lead to significant increase in mechanical performance.
520 $a Finally, a multiscale framework based on first-order computational homogenization theory is implemented. The microscopic scale uses the microstructurally-based tools discussed earlier in a framework is designed for parallel processing. Various computational strategies are pursued including self-consistent and fully-coupled approaches. As an application of this method, we attempt to capture microscopic fracture mechanisms that control crack propagation speeds during dynamic crack propagation.
590 $a School code: 0098.
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0346
690 $a 0548
690 $a 0794
710 2 $a The Johns Hopkins University. $3 1017431
773 0 $t Dissertation Abstracts International $g 69-04B.
790 $a 0098
790 1 0 $a Graham-Brady, Lori, $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3309697