Abstract
In this study, strain rate effects on the tensile and compressive properties of nano-crystalline nanoporous gold (nc-NPAu) are investigated by performing molecular dynamics simulations. For this purpose, atomistic models of nc-NPAu structures with three different grain sizes are generated through a novel modeling technique based on the Voronoi tessellation method. Additionally, an adaptive common neighbor analysis (aCNA) is carried out to examine the evolution of the crystal structure. In this way, the deformation mechanisms of nc-NPAu atomistic models are thoroughly investigated. The findings point out that mechanical properties of nc-NPAu specimens such as toughness, ultimate and yield strengths grow at increasing strain rates for both tensile and compressive loadings while their elastic moduli exhibit less significant variations at different strain rates. Furthermore, the study also shows that in addition to dislocation motion, several other deformation mechanisms including grain rotation, grain boundary sliding and grain travelling are observed to be effective for nc-NPAu.
Original language | English |
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Article number | 103338 |
Journal | Mechanics of Materials |
Volume | 143 |
DOIs | |
Publication status | Published - Apr 2020 |
Bibliographical note
Publisher Copyright:© 2020
Funding
The first author has been supported by the Scientific and Technological Research Council of Turkey (TUBITAK) in the framework of 2214-A International Doctoral Research Fellowship Programme (Grant number: 1059B141700093) for his studies in Lund University, Sweden. The first author has been supported by the Scientific and Technological Research Council of Turkey (TUBITAK) in the framework of 2214-A International Doctoral Research Fellowship Programme (Grant number: 1059B141700093 ) for his studies in Lund University, Sweden.
Funders | Funder number |
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TUBITAK | |
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu | 1059B141700093 |
Keywords
- Molecular dynamics simulations
- Nano-crystalline
- Nanoporous