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Simulating the durability mechanics ...

Li, Zhen.

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Simulating the durability mechanics of cement composites: Methods development.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Simulating the durability mechanics of cement composites: Methods development./
作者:	Li, Zhen.
面頁冊數:	136 p.
附註:	Source: Dissertation Abstracts International, Volume: 68-08, Section: B, page: 5426.
Contained By:	Dissertation Abstracts International68-08B.
標題:	Applied Mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3280613
ISBN:	9780549216155

Simulating the durability mechanics of cement composites: Methods development.
Li, Zhen.

Simulating the durability mechanics of cement composites: Methods development. - 136 p.

Source: Dissertation Abstracts International, Volume: 68-08, Section: B, page: 5426.

Thesis (Ph.D.)--University of California, Davis, 2007.

Several fundamental methods have been developed for the long-term goal of modeling the durability mechanics of cement-based composites. Threedimensional irregular lattice models are established to simulate: (1) the load-deformational behavior of, and (2) moisture transfer processes in, cement-based composites. A Delaunay-Voronoi tessellation is used for discretizing both model domains and to facilitate the coupling of these two models in simulating hygral-mechanical problems, such as fracture caused by drying shrinkage. The basic element properties are scaled according to the dual tessellation so that the models exhibit no mesh bias when simulating uniform strain or flow fields. The implementation of these models involves an efficient memory storage scheme and low-rank updates of the Cholesky factorization of the system stiffness matrix to improve computational efficiency during fracture analyses.

ISBN: 9780549216155Subjects--Topical Terms:

1018410
Applied Mechanics.

Simulating the durability mechanics of cement composites: Methods development.
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520 $a Several fundamental methods have been developed for the long-term goal of modeling the durability mechanics of cement-based composites. Threedimensional irregular lattice models are established to simulate: (1) the load-deformational behavior of, and (2) moisture transfer processes in, cement-based composites. A Delaunay-Voronoi tessellation is used for discretizing both model domains and to facilitate the coupling of these two models in simulating hygral-mechanical problems, such as fracture caused by drying shrinkage. The basic element properties are scaled according to the dual tessellation so that the models exhibit no mesh bias when simulating uniform strain or flow fields. The implementation of these models involves an efficient memory storage scheme and low-rank updates of the Cholesky factorization of the system stiffness matrix to improve computational efficiency during fracture analyses.
520 $a A semi-discrete fiber model is developed to form lattice models of fiber reinforced cement composites. This enables studying the behavior of individual fibers, and collections of fibers, within the composite material. The simulation results demonstrate the effects of fibers in restraining drying shrinkage. Aspects of these results are verified through comparisons with experimental and analytical work of others.
520 $a The irregular lattice model is used to simulate the fracture behavior of cement composites due to drying shrinkage. Different external boundary conditions, or interfacial bonding in overlay systems, significantly change the fracture pattern of the modeled components. The fracture patterns produced by the lattice modeling are qualitatively evaluated by comparing with actual fracture patterns.
520 $a Three-dimensional visualization of internal moisture transport is realized through nodal flux calculations based on the lattice model for moisture transport. The flow field can be represented by discrete nodal flux vectors plotted inside the domain of interest. A forward stepping algorithm is also developed to track the movement of individual moisture particles over time. The tortuosity of the three-dimensional flow path, due to the existence of inclusions, is revealed through this tracking algorithm. Preliminary steps are taken toward simulating the moisture flow through porous interfacial transition zones in multiphase particulate composites. The ultimate goal is to simulate the couplings between moisture transport and material degradation due to fracture in cement composites.
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