$A new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials$

A new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials

<p>This work aims to develop and implement a linear elastic grain-level micromechanical model based on the discrete element method using bonded contacts and an improved fracture criteria to capture both intergranular and transgranular microcrack initiation and evolution in polycrystalline cera...

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Main Author:	Saleme Ruiz, Katerine
Other Authors:	Tonya W. Stone
Format:	Others
Language:	en
Published:	MSSTATE 2016
Subjects:	Bagley College of Engineering
Online Access:	http://sun.library.msstate.edu/ETD-db/theses/available/etd-06292016-163357/

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spelling	ndltd-MSSTATE-oai-library.msstate.edu-etd-06292016-1633572019-05-15T18:43:59Z A new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials Saleme Ruiz, Katerine Bagley College of Engineering <p>This work aims to develop and implement a linear elastic grain-level micromechanical model based on the discrete element method using bonded contacts and an improved fracture criteria to capture both intergranular and transgranular microcrack initiation and evolution in polycrystalline ceramics materials. Gaining a better understanding of the underlying mechanics and micromechanics of the fracture process of brittle polycrystalline materials will aid in high performance material design. Continuum mechanics approaches cannot accurately simulate the crack propagation during fracture due to the discontinuous nature of the problem. In this work we distinguish between predominately intergranular failure (along the grain boundaries) versus predominately transgranular failure (across the grains) based on grain orientation and microstructural parameters to describe the contact interfaces and present the first approach at fracturing discrete elements. Specifically, the influence of grain boundary strength and stiffness on the fracture behavior of an idealized ceramic material is studied under three different loading conditions: uniaxial compression, brazilian, and four-point bending. Digital representations of the sample microstructures for the test cases are composed of hexagonal, prismatic, honeycomb-packed grains represented by rigid, discrete elements. The principle of virtual work is used to develop a microscale fracture criteria for brittle polycrystalline materials for tensile, shear, torsional and rolling modes of intergranular motion. The interactions between discrete elements within each grain are governed by traction displacement relationships.</p> Tonya W. Stone Ioana Banicescu John F. Peters Hyeona Lim Laura E. Walizer MSSTATE 2016-07-22 text application/pdf http://sun.library.msstate.edu/ETD-db/theses/available/etd-06292016-163357/ http://sun.library.msstate.edu/ETD-db/theses/available/etd-06292016-163357/ en unrestricted I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, Dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Mississippi State University Libraries or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, Dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, Dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, Dissertation, or project report.
collection	NDLTD
language	en
format	Others
sources	NDLTD
topic	Bagley College of Engineering
spellingShingle	Bagley College of Engineering Saleme Ruiz, Katerine A new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials
description	<p>This work aims to develop and implement a linear elastic grain-level micromechanical model based on the discrete element method using bonded contacts and an improved fracture criteria to capture both intergranular and transgranular microcrack initiation and evolution in polycrystalline ceramics materials. Gaining a better understanding of the underlying mechanics and micromechanics of the fracture process of brittle polycrystalline materials will aid in high performance material design. Continuum mechanics approaches cannot accurately simulate the crack propagation during fracture due to the discontinuous nature of the problem. In this work we distinguish between predominately intergranular failure (along the grain boundaries) versus predominately transgranular failure (across the grains) based on grain orientation and microstructural parameters to describe the contact interfaces and present the first approach at fracturing discrete elements. Specifically, the influence of grain boundary strength and stiffness on the fracture behavior of an idealized ceramic material is studied under three different loading conditions: uniaxial compression, brazilian, and four-point bending. Digital representations of the sample microstructures for the test cases are composed of hexagonal, prismatic, honeycomb-packed grains represented by rigid, discrete elements. The principle of virtual work is used to develop a microscale fracture criteria for brittle polycrystalline materials for tensile, shear, torsional and rolling modes of intergranular motion. The interactions between discrete elements within each grain are governed by traction displacement relationships.</p>
author2	Tonya W. Stone
author_facet	Tonya W. Stone Saleme Ruiz, Katerine
author	Saleme Ruiz, Katerine
author_sort	Saleme Ruiz, Katerine
title	A new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials
title_short	A new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials
title_full	A new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials
title_fullStr	A new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials
title_full_unstemmed	A new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials
title_sort	new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials
publisher	MSSTATE
publishDate	2016
url	http://sun.library.msstate.edu/ETD-db/theses/available/etd-06292016-163357/
work_keys_str_mv	AT salemeruizkaterine anewframeworkbasedonadiscreteelementmethodtomodelthefracturebehaviorforbrittlepolycrystallinematerials AT salemeruizkaterine newframeworkbasedonadiscreteelementmethodtomodelthefracturebehaviorforbrittlepolycrystallinematerials
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A new framework based on a discrete element method to model the fracture behavior for brittle polycrystalline materials

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