A novel atomistic modeling technique for poly-crystalline nanoporous metals

Yunus Onur Yildiz, Mesut Kirca

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

In this study, a novel technique, which is mainly based on the Voronoi tessellation method representing randomly oriented three-dimensional network of ligaments for the atomistic modeling of poly-crystalline nanoporous metals, is presented. In this regard, by the utilization of the proposed methodology atomistic models of polycrystalline nanoporous metals consisting of randomly oriented ligaments with nonuniform mass distribution along the ligament axis can be generated, which in turn enables researchers to control both length and diameter of the individual ligaments within the porous network. Furthermore, the atomistic models of poly-crystalline nanoporous materials can be simply employed for the mechanical, thermal and acoustic characterization through molecular dynamics (MD) simulations. In general, proposed modeling technique consists of five steps. In the first step, a modeling process, which has been already used in literature for the modeling of poly-crystalline bulk metals, is followed. In this step, Voronoi tessellation technique is utilized for the purpose of generating the granular structure. In the second step, in order to define the volumetric region for the ligaments of the nanoporous structure, the process for the generation of a new Voronoi tessellation is initiated. In the following step, the coordinates of randomly distributed points are determined in a controlled way to be employed in the establishment of the Voronoi tessellation, which results in randomly oriented and intersected line segments. Then, the line segment representation of the Voronoi tessellation is transformed into a unique volumetric region by using spherical regions. Finally, the atoms external to the volumetric region are removed from the poly-crystalline bulk metal resulting in a poly-crystalline nanoporous structure. In conclusion, the ultimate goal of the study is to generate atomic coordinates that can be employed for the MD simulations of randomly organized poly-crystalline nanoporous structures. Furthermore, the thermodynamic stability of poly-crystalline nanoporous metal is also investigated to validate the feasibility of the atomistic model.

Original languageEnglish
Title of host publication32nd Technical Conference of the American Society for Composites 2017
EditorsJohnathan Goodsell, Wenbin Yu, R. Byron Pipes
PublisherDEStech Publications Inc.
Pages1750-1759
Number of pages10
ISBN (Electronic)9781510853065
Publication statusPublished - 2017
Event32nd Technical Conference of the American Society for Composites 2017 - West Lafayette, United States
Duration: 23 Oct 201725 Oct 2017

Publication series

Name32nd Technical Conference of the American Society for Composites 2017
Volume3

Conference

Conference32nd Technical Conference of the American Society for Composites 2017
Country/TerritoryUnited States
CityWest Lafayette
Period23/10/1725/10/17

Bibliographical note

Publisher Copyright:
Copyright © (2017) by DEStech Publications, Inc. All rights reserved.

Funding

We would like to thank the Scientific and Technological Research Council of Turkey (TUBITAK) (Grant numbers: 214M638) for its financial support.

FundersFunder number
TUBITAK214M638
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

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