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Computational modeling of damage in ...

The Johns Hopkins University.

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Computational modeling of damage in brittle materials.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Computational modeling of damage in brittle materials./
作者:	Kraft, Reuben H.
面頁冊數:	164 p.
附註:	Adviser: Lori Graham-Brady.
Contained By:	Dissertation Abstracts International69-04B.
標題:	Applied Mechanics. -
電子資源:	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.
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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.
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650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Mechanical. $3 783786
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