Molecular dynamics study on shock-induced spallation and damage evolution in nano-polycrystalline Ta: Internal grain size effect vs external shock intensity effect

2021 ◽  
Vol 130 (20) ◽  
pp. 205104
Author(s):  
Dun Wu ◽  
Yaxin Zhu ◽  
Minsheng Huang ◽  
Lv Zhao ◽  
Zhenhuan Li
Keyword(s):  
Molecular Dynamics ◽  
Grain Size ◽  
Size Effect ◽  
Shock Intensity ◽  
Damage Evolution ◽  
Grain Size Effect ◽  
Intensity Effect

scholarly journals Molecular Dynamics Simulation of Nanoscale Abrasive Wear of Polycrystalline Silicon

Crystals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 463 ◽  
Author(s):  
Pengzhe Zhu ◽  
Rui Li ◽  
Hanyu Gong
Keyword(s):  
Molecular Dynamics ◽  
Grain Size ◽  
Size Effect ◽  
Friction Force ◽  
Polycrystalline Silicon ◽  
Normal Force ◽  
Crystalline Silicon ◽  
Grain Size Effect ◽  
Single Crystalline Silicon ◽  
Nanoscale Wear

In this work, molecular dynamics simulations of the nanoscratching of polycrystalline and singlecrystalline silicon substrates using a single-crystal diamond tool are conducted to investigate the grain size effect on the nanoscale wear process of polycrystalline silicon. We find that for a constant indentation depth, both the average normal force and friction force are much larger for single-crystalline silicon compared to polycrystalline silicon. It is also found that, for the polycrystalline substrates, both the average normal force and friction force increase with increasing grain size. However, the friction coefficient decreases with increasing grain size, and is the smallest for single-crystalline silicon. We also find that the quantity of wear atoms increases nonlinearly with the average normal load, inconsistent with Archard’s law. The quantity of wear atoms is smaller for polycrystalline substrates with a larger average grain size. The grain size effect in the nanoscale wear can be attributed to the fact that grain boundaries contribute to the plastic deformation of polycrystalline silicon.

Nanoindentation response of nanocrystalline copper via molecular dynamics: Grain-size effect

2020 ◽  
Vol 241 ◽  
pp. 122391 ◽  
Author(s):  
Jiejie Li ◽  
Binbin Lu ◽  
Yuhang Zhang ◽  
Hongjian Zhou ◽  
Guoming Hu ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Grain Size ◽  
Size Effect ◽  
Grain Size Effect ◽  
Nanocrystalline Copper

Landau-Ginzburg-Devonshire Theory of the Grain Size Effect on the Ferroelectricity in BaTiO 3 Nanoceramics

2020 ◽  
Author(s):  
Kum-Ok Jang ◽  
Il-Hwan Kim ◽  
Il-Hun Kim ◽  
Kye-Ryong Sin ◽  
Chol-Jin Kim
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Grain Size Effect

scholarly journals Grain size effect on radiation tolerance of nanocrystalline Mo

2016 ◽  
Vol 123 ◽  
pp. 90-94 ◽  
Author(s):  
G.M. Cheng ◽  
W.Z. Xu ◽  
Y.Q. Wang ◽  
A. Misra ◽  
Y.T. Zhu
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Radiation Tolerance ◽  
Grain Size Effect

Grain size effect on the dielectric and non-ohmic properties of CaCu3Ti4O12 ceramics prepared by the sol-gel process

2019 ◽  
Vol 778 ◽  
pp. 625-632 ◽  
Author(s):  
Pu Mao ◽  
Jiping Wang ◽  
Shujuan Liu ◽  
Lixue Zhang ◽  
Yingying Zhao ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Sol Gel ◽  
Grain Size Effect ◽  
Sol Gel Process
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