Le Van Sang

Le Van Sang
University of Information Technology-Vietnam National University, Ho Chi Minh City

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19
Publications
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59
Citations

Publications

Publications (19)
Article
Polyethylene (PE) and branched PE reveal as common materials inserted inside contacts in medical and industrial applications. Consequently, their tribological properties were extensively investigated in the past. This paper aims to carry out lubrication behavior of polyethylethylene (PEE) for iron contact and two main factors as temperature and car...
Article
Full-text available
The paper carries out the smoothed particle hydrodynamics simulations of lubrication for the micronscale iron contact by the 20 types of the spherical solid oxide particles. The iron slabs and oxide particles of micrometer sizes are modeled by the elastic particle lattice coarse-graining and discrete element method, respectively. Motion of the iron...
Article
The paper uses molecular dynamics simulations to investigate lubrication of graphene for the iron contacts. The graphene sheets are vertically buried into the iron surface by the annealing of melting and cooling it. The friction detection is carried out in various conditions as dependence of friction on the number of the graphene sheets buried on t...
Article
The present study uses the smoothed particle hydrodynamics (SPH) and discrete element method (DEM) coupling to investigate influence of the hexagonal boron nitride (hBN) particles on friction of the elastic coarse-grained micronscale iron. The hBN lubricant particles significantly improves the friction performance of iron in various simulation beha...
Article
In materials science, water plays an important part, especially at the molecular level. It shows various properties when sorbed onto surfaces of polymers. The structure of the molecular water ensemble in the vicinity of the polymers is under discussion. In this study, we used molecular dynamics methods to analyze the structure of water in the vicin...
Article
The study focuses on monitoring influence of the alumina coatings on friction and stability of the microscale iron contacts by the smoothed particle hydrodynamics. The obtained results show a better stability and a higher value of the friction coefficient of the coated surface compared to the uncoated one. This study also supposes that in concern o...
Article
Full-text available
The paper focuses on examining agreement of the adaptive smoothed particle hydrodynamics (ASPH) in the investigation of the sliding friction of silica at micronscale throughout observation of several friction characteristics. It is found that the ASPH approach well presents the friction of micronscale silica due to agreement of the friction coeffic...
Article
The paper investigates the friction and friction heat of the micronscale iron under the influences as velocity of the slider and temperature of the substrate by using the smoothed particle hydrodynamics simulations. It is found that in the velocity range of 10 – 100 m/s, the sliding velocity – friction coefficient relationship well complies with th...
Article
A large-scale parallel computing model based on the SPH (Smoothed Particle Hydrodynamics) method was developed for dry shear friction between elastic-plastic solids. Our main purpose is to elucidate the mechanism of the frictional wear and heat generation between the asperities on the interface in meso-scale. In our model, the elastic-plastic motio...
Conference Paper
Full-text available
Meso-scale frictional dynamics of elastic-plastic bodies were studied using Smoothed Particle Hydrodynamics (SPH) method. Our coarse-grained model can consider the plasticity, wear and heating based on the continuum dynamics and molecular approach. The former mainly expresses the elastic-plastic properties and the latter plays the interaction betwe...
Article
Full-text available
The paper presents the construction of a coarse-grained model to investigate dry sliding friction of the body-centered-cubic Fe micron-scale system by smoothed particle hydrody-namics simulations and examines influences of the spring force on the characters of friction. The 864 × 10^12 atoms Fe system is coarse-grained into the two different simple...
Article
In this paper, we use molecular dynamics (MD) simulations to relax the initially random system into a triangular lattice. The initial system contains 900 atoms that interact with each other via the interaction potential established by Rechtsman et al. (Phys. Rev. Lett. 95, 228301 (2005)). Our results show that the targeted lattice is stable via rel...
Article
Molecular dynamics simulations have been used to cool the simple liquid TPI4P/2005 water at 350 K to 100 K. We find that structural changes of the system cause dynamic and thermodynamic anomalies. A strong increase in the number of tetrahedral oxygen atoms and combinations of these atoms lead to water’s a phase transition from a simple liquid form...
Article
Full-text available
In the present work, we use molecular dynamics (MD) simulations to investigate melting of the crystalline Si nanoparticle. Atoms in the nanoparticle interact with each other via the Stillinger-Weber potential. Two heating rates are used. We find that melting of the nanoparticle occurs via propagation of quasi-liquid layer from the surface into the...
Article
Full-text available
Molecular dynamics (MD) simulations are used to investigate the thermodynamic properties and structural changes of KCl spherical nanoparticles at various sizes (1064, 1736, 2800, 3648, 4224 and 5832 ions) upon heating. The melting temperature is dependent on both the size and shape of KCl models, and the behaviour of the first order phase transitio...
Article
Full-text available
Melting of fcc Lennard-Jones (LJ) nanoparticles is studied by heating up models from low temperature toward liquid phase using molecular dynamics (MD) simulation. Atomic mechanism of melting is analyzed via temperature dependence of potential energy, heat capacity, analysis of the spatio-temporal arrangements of liquidlike atoms occurred during the...

Questions

Questions (3)
Question
May one make a Heaviside function in Lammps?
as H(x) = 1 with x >= 0
H(x) = 0 with x < 0
Question
It is easy to make an atomic model by using a Cif file and Vesta or Jmol. To do this, one should extract unit cell from a Cif file and Vesta, then expanding it. Or other way, expanding the Cif file by Vesta, then remove boundary atoms (not need).

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Projects

Project (1)
Project
Reduction of wear and seizure on EHL or solid-solid friction. I research it by SPH simulation, using c++ and FDPS framework.(FDPS is efficient package by Riken for parallel coding of large scaled particle simulation.)