ORCID Profile
0000-0002-4270-6082
Current Organisations
Mansoura University Faculty of Agriculture
,
Mansoura University
,
Northeastern University
,
University of Queensland
,
University of Wollongong
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Publications
Yielding nature and Hall-Petch relationships in Ti-6Al-4V alloy with fully equiaxed and bimodal microstructures
Publisher: Elsevier BV
Date: 11-2019
A study of plastic deformation behavior during high pressure torsion process by crystal plasticity finite element simulation
Publisher: IOP Publishing
Date: 08-08-2014
An insight into the deformation and orientation development of severely plastic deformed aluminum
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4806826
Contact fatigue performance and failure mechanisms of Fe-based small-module gears fabricated using powder metallurgy technique
Publisher: Elsevier BV
Date: 09-2023
Microstructure Evolution and Phase Transformation of Ti‐1.0 wt%Fe Alloy with an Equiaxed α + β Initial Microstructure during High‐Pressure Torsion and Subsequent Annealing
Publisher: Wiley
Date: 02-08-2019
Tension/compression asymmetry of grain boundaries with non-planar structure
Publisher: IOP Publishing
Date: 19-08-2016
Effects of oxidation on friction and wear properties of eutectic high-entropy alloy AlCoCrFeNi2.1
Publisher: Elsevier BV
Date: 08-2021
Shear texture gradient in AA6061 aluminum alloy processed by accumulative roll bonding with high roll roughness
Publisher: Elsevier BV
Date: 05-2014
Roles of microstructure, inclusion, and surface roughness on rolling contact fatigue of a wind turbine gear
Publisher: Wiley
Date: 23-01-2020
DOI: 10.1111/FFE.13199
Lubrication mechanism of sodium metasilicate at elevated temperatures through tribo-interface observation
Publisher: Elsevier BV
Date: 02-2020
Influence of Fe addition in CP titanium on phase transformation, microstructure and mechanical properties during high pressure torsion
Publisher: Elsevier BV
Date: 05-2020
Postponing the fracture strain of ultrafine-grained 316LN steel by sequential activations of deformation modes at 77 K
Publisher: Elsevier BV
Date: 05-2022
Crystal plasticity study of the effect of the initial orientation on the indentation surface profile patterns and micro-textures of aluminum single crystal
Publisher: Wiley
Date: 22-07-2013
Microstructure, mechanical and tribological properties of Al0.3CrFeNiTi0.3-CaF2/BaF2 self-lubricating composite fabricated by spark plasma sintering
Publisher: Elsevier BV
Date: 10-2023
A numerical model for simulation of crack initiation around inclusion under tensile load
Publisher: American Scientific Publishers
Date: 10-2012
A review on plastic deformation induced surface/interface roughening of sheet metallic materials
Publisher: Elsevier BV
Date: 11-2021
Microstructural, mechanical and tribological performances of copper foam modified CFRP composite for pantograph strip
Publisher: Wiley
Date: 27-04-2021
DOI: 10.1002/APP.50901
Abstract: A novel pantograph strip of copper mesh modified carbon fiber reinforced polymer (CFRP) composite was fabricated by impregnating copper foam with the resin mixture of carbon fiber and flaky graphite, following by mold hot‐pressing technology. Microstructure, mechanical strength, electric conductivity, friction, and wear behaviors of the composite were investigated and analyzed to explore the fracture failure and wear mechanisms. The results show that the composite obtains much lower electric resistance than that of the pure carbon strip used in China's high‐speed railway. Adding carbon fiber can improve impact strength and wear resistance considerably, but has little effect on anti‐friction performance. The electric resistance and tribological performances are graphite dependent, reduced electric resistance and friction coefficient can be obtained with the increase of flaky graphite from 0 to 15 wt% while negligible changes of impact strength and wear rate are found. However, further increasing the flaky graphite to 20 wt%, the wear rate reveals a dramatic rise. High content of flaky graphite contributes to the formation of thick tribolayer with unconsolidated structure. And the tribolayer is easy to curl and worn off from the wear surface, leading to severe wear of the composite during the current carrying friction tests.
Vacancy-type defects study on ultra-fine grained aluminium processed by severe plastic deformation
Publisher: American Scientific Publishers
Date: 07-2014
Numerical Evaluation of a High Speed Steel Work Roll during Hot Strip Rolling Process
Publisher: Trans Tech Publications, Ltd.
Date: 08-2017
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.904.55
Abstract: Hot strip rolling process is one of the most promising industrial processes to fabricate finished or semi-finished bulk products. Numerical analysis on the temperature and thermal stress distributions in a high speed steel work roll during hot rolling has been conducted based on a transient thermo-mechanical model. Influence of initial work roll body temperature on temperature and thermal stress has been discussed in detail by assuming different rolling stages. Compared to the work roll surface, stress is much smaller at depth of 2.1 mm and 5.0 mm, respectively. Results showed similar maximum circumferential thermal stress at both depths of 2.1 mm and 5.0 mm when the roll has initial temperature of 25 °C and 100 °C, but they are about 3 times and 8 times larger than at depth of 2.1 mm and 5.0 mm, respectively, when the initial temperature is 200 °C.
A study on the texture evolution mechanism of nickel single crystal deformed by high pressure torsion
Publisher: Elsevier BV
Date: 2017
Investigation on the Microstructure and Mechanical Properties of Ti-1.0Fe Alloy with Equiaxed α + β Microstructures
Publisher: Springer Science and Business Media LLC
Date: 19-04-2020
Influence of white etching layer on rolling contact behavior at wheel-rail interface
Publisher: Springer Science and Business Media LLC
Date: 20-05-2020
DOI: 10.1007/S40544-020-0388-X
Abstract: The existence of narrow and brittle white etching layers (WELs) on the rail surface is often linked with the formation of rail defects such as squats and studs, which play the key roles in rail surface degradation and tribological performance. In the present study, a systematic investigation on stress/strain distribution and fatigue life of the WEL during wheel-rail rolling contact was conducted based on a numerical model considering the realistic wheel geometry. This is the first study considering the influence of rail materials, loading pressure, frictional condition, WEL geometry ( a/b ), and slip ratio (Sr) in the practical service conditions at the same time. The results revealed much higher residual stress in WEL than in rail matrix. Stress changes along the rail depth matched with the previously reported microstructure evolutions. The current work revealed that the maximum difference in contact stress between the wheel passages of rail matrix and the WEL region (noted as stress variation) rises with the increase of loading pressure, the value of a/b , and Sr but drops with the friction coefficient ( μ ). In addition, a critical length-depth ratio of 5 for a/b has been found. The fatigue parameter, FP, of the WEL decreased quickly with the length-depth ratio when it was less than 5 and then increased slightly when it was larger than 5. This study also revealed that the fatigue life of the WEL was reduced for high strength head hardened (HH) rail compared with standard carbon (SC) rail.
Modeling of contact fatigue damage behavior of a wind turbine carburized gear considering its mechanical properties and microstructure gradients
Publisher: Elsevier BV
Date: 06-2019
Effect of counterpart materials on tribological behaviors of copper impregnated carbon/carbon composite under electric current condition
Publisher: Elsevier BV
Date: 09-2023
Ultrafine grained AA1050/AA6061 composite produced by accumulative roll bonding
Publisher: Elsevier BV
Date: 2013
A study of water-based lubricant with a mixture of polyphosphate and nano-TiO2 as additives for hot rolling process
Publisher: Elsevier BV
Date: 07-2021
Theoretical and experimental investigation of thermal and oxidation behaviours of a high speed steel work roll during hot rolling
Publisher: Elsevier BV
Date: 10-2017
Hydrogen-Induced Dislocation Nucleation and Plastic Deformation of 〈001〉 and 〈1¯0〉 Grain Boundaries in Nickel
Publisher: MDPI AG
Date: 19-09-2022
DOI: 10.3390/MA15186503
Abstract: The grain boundary (GB) plays a crucial role in dominating hydrogen-induced plastic deformation and intergranular failure in polycrystal metals. In the present study, molecular dynamics simulations were employed to study the effects of hydrogen segregation on dislocation plasticity of a series of symmetrical tilt grain boundaries (STGBs) with various hydrogen concentrations. Our study shows that hydrogen both enhances and reduces dislocation nucleation events from STGBs, depending on different GB structures. Specifically, for ⟨001⟩ STGBs, hydrogen does not affect the mode of heterogeneous dislocation nucleation (HDN), but facilitates nucleation events as a consequence of hydrogen disordering the GB structure. Conversely, hydrogen retards dislocation nucleation due to the fact that hydrogen segregation disrupts the transformation of boundary structure such as Σ9 (2 2 1¯) ⟨11¯0⟩ STGB. These results are helpful for deepening our understanding of GB-mediated hydrogen embrittlement (HE) mechanisms.
The effect of expanded graphite with sodium metasilicate as lubricant at high temperature
Publisher: Elsevier BV
Date: 04-2020
Tribological Properties of Different-Sized Black Phosphorus Nanosheets as Water-Based Lubrication Additives for Steel/Titanium Alloy Wear Contact
Publisher: MDPI AG
Date: 07-02-2022
DOI: 10.3390/MET12020288
Investigation of sample size effect on the deformation heterogeneity and texture development during equal channel angular pressing
Publisher: Elsevier BV
Date: 06-2013
Influence of Al and Mo on microstructure and tribological behaviors of Co-based superalloy
Publisher: Elsevier BV
Date: 10-2023
Influence of cold rolling reduction on the deformation behaviour and crystallographic orientation development
Publisher: Elsevier BV
Date: 2014
Evolution of thermally induced white etching layer at rail surface during multiple wheel/train passages
Publisher: Elsevier BV
Date: 06-2022
High load capability, sticking scale inhabitation and promising lubrication of sodium carbonate coating for steel/steel contact at high temperature
Publisher: Elsevier BV
Date: 2021
A micromechanics-based machine learning model for evaluating the microstructure-dependent rolling contact fatigue performance of a martensitic steel
Publisher: Elsevier BV
Date: 2023
A crystal plasticity FEM study of through-thickness deformation and texture in a {112} <111> aluminium single crystal during accumulative roll-bonding
Publisher: Springer Science and Business Media LLC
Date: 04-03-2019
DOI: 10.1038/S41598-019-39039-Y
Abstract: In this study, a crystal plasticity finite element method (CPFEM) model was used to study the deformation behaviour in an aluminium single crystal (1 1 2)[1 1 -1] processed by accumulative roll-bonding (ARB) up to 9 cycles. The simulation followed the real ARB process based on the developed finite element model. The predicted through-thickness texture matches well with the experimental observations. The deformation behaviours, in terms of crystal rotation, shear strain and slip system activation, in the first and second cycles (conventional rolling) were unidirectional, but the deformation was altered after ARB was applied from the third cycle onwards. Such alteration was found to be caused by the thickness position change and deformation discontinuity at interfaces, which were investigated in detail. The role that interfaces play became dominant over thickness position change as increasing ARB cycles.
Evolution of microstructure, temperature and stress in a high speed steel work roll during hot rolling: Experiment and modelling
Publisher: Elsevier BV
Date: 02-2017
Computing Geographical Networks Generated by Air‐Mass Movement
Publisher: American Geophysical Union (AGU)
Date: 10-2023
DOI: 10.1029/2023GH000885
Modelling of Texture Evolution in High Pressure Torsion by Crystal Plasticity Finite Element Method
Publisher: Trans Tech Publications, Ltd.
Date: 05-2015
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.764-765.56
Abstract: In this study, texture evolution during high pressure torsion (HPT) of aluminum single crystal is predicted by the crystal plasticity finite element method (CPFEM) model integrating the crystal plasticity constitutive theory with Bassani & Wu hardening model. It has been found by the simulation that, during the HPT process, the lattice rotates mainly around the radial direction of the s le. With increasing HPT deformation, the initial cube orientation rotates progressively to the rotated cube orientation, and then to the C component of ideal torsion texture which could be remained over a wide strain range. Further HPT deformation leads to the orientation towards to the ideal texture component.
Numerical modeling of rolling contact fatigue cracks in the railhead
Publisher: Elsevier BV
Date: 2023
Grain size and scratching depth dependent tribological characteristics of CrCoNi medium-entropy alloy coatings: A molecular dynamics simulation study
Publisher: Elsevier BV
Date: 09-2023
Microstructural study and residual stress measurement of a hot rolling work roll material during isothermal oxidation
Publisher: Springer Science and Business Media LLC
Date: 21-01-2019
Study of wear and friction properties of a Co-free CrFeNiAl0.4Ti0.2 high entropy alloy from 600 to 950 °C
Publisher: Elsevier BV
Date: 05-2022
Microstructure and mechanical properties of AA5005/AA6061 laminated composite processed by accumulative roll bonding
Publisher: Springer Science and Business Media LLC
Date: 24-05-2014
Crystal plasticity FEM study on the influence of crystallographic orientation in copper single crystals subjected to equal channel angular pressing
Publisher: Wiley
Date: 07-06-2013
Influence of preload on the tribological performance of MoS2/GO composite lubricating coating
Publisher: Elsevier BV
Date: 03-2023
Investigation of Grain Refinement Mechanism of Nickel Single Crystal during High Pressure Torsion by Crystal Plasticity Modeling
Publisher: MDPI AG
Date: 23-01-2019
DOI: 10.3390/MA12030351
Abstract: The excellent properties of ultra-fine grained (UFG) materials are relevant to substantial grain refinement and the corresponding induced small grains delineated by high-angle grain boundaries. The present study aims to understand the grain refinement mechanism by examining the nickel single crystal processed by high pressure torsion (HPT), a severe plastic deformation method to produce UFG materials based upon crystal plasticity finite element (CPFEM) simulations. The predicted grain maps by the developed CPFEM model are capable of capturing the prominent characteristics associated with grain refinement in HPT. The evolution of the orientation of structural elements and the rotations of crystal lattices during the HPT process of the detected differently oriented grains are extensively examined. It has been found that there are mainly two intrinsic origins of lattice rotation which cause the initial single crystal to sub ide. The correlation between the crystallographic orientation changes and lattice rotations with the grain fragmentation are analyzed and discussed in detail based on the theory of crystal plasticity.
Sintered ZrO2 –TiO2 ceramic composite and its mechanical appraisal
Publisher: Elsevier BV
Date: 2020
Investigation into reciprocating dry sliding friction and wear properties of bulk CoCrFeNiMo high entropy alloys fabricated by spark plasma sintering and subsequent cold rolling processes: Role of Mo element concentration
Publisher: Elsevier BV
Date: 11-2020
Finite-Temperature Multiscale Simulations for 3D Nanoscale Contacts
Publisher: Trans Tech Publications, Ltd.
Date: 07-2016
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.846.288
Abstract: A finite-temperature analysis of a multiscale model, which couples finite element and molecular dynamics, is presented in this paper. The model is evaluated by the patch test and demonstrates its capacity. Then, the multiscale scheme is used to study 3D nanoscale contacts. The linear relationship between the contact area ratio and load is observed at small loads, but the temperature effect is small. However, the change in the root mean square (RMS) of heights depends on the temperature at high loads.
A novel strategy based on machine learning of selective cooling control of work roll for improvement of cold rolled strip flatness
Publisher: Springer Science and Business Media LLC
Date: 17-10-2023
Tribological performance of a cost-effective CrFeNiAl0.3Ti0.3 high entropy alloy based self-lubricating composite in a wide temperature range
Publisher: Elsevier BV
Date: 10-2022
Temperature-dependent tensile properties of ultrafine-grained C-doped CoCrFeMnNi high-entropy alloy
Publisher: Springer Science and Business Media LLC
Date: 12-04-2022
Advances in Friction, Lubrication, Wear and Oxidation in Metals Manufacturing
Publisher: MDPI AG
Date: 02-03-2023
DOI: 10.3390/MET13030505
Abstract: When quickly reviewing the developments of new materials design and fabrication, and engineering and industrial manufacturing, it was found that tribology is a very complicated and highly challenging field that cannot be avoided to improve the manufacturing cost and increase the material service life [...]
Mechanisms of remarkable wear reduction and evolutions of subsurface microstructure and nano-mechanical properties during dry sliding of nano-grained Ti6Al4V alloy: A comparative study
Publisher: Elsevier BV
Date: 05-2022
On the Aging Behavior of Ti-1.0 wt pct Fe Alloy With an Equiaxed α + β Initial Microstructure
Publisher: Springer Science and Business Media LLC
Date: 19-03-2023
Contribution of Sodium Metasilicate to the Diffusion of Mn in Steel under Tribological Contact at High Temperatures
Publisher: American Chemical Society (ACS)
Date: 22-05-2019
Insights into the behavior of polyphosphate lubricant in hot rolling of mild steel
Publisher: Elsevier BV
Date: 04-2019
The formation and destruction of stacking fault tetrahedron in fcc metals: A molecular dynamics study
Publisher: Elsevier BV
Date: 07-2017
A crystal plasticity study of the effect of friction on the evolution of texture and mechanical behaviour in the nano-indentation of an aluminium single crystal
Publisher: Elsevier BV
Date: 2014
Occurrence of surface defects on strips during hot rolling process by FEM
Publisher: Springer Science and Business Media LLC
Date: 16-10-2013
Investigation of a Novel Hydrogen Depressurization Structure Constituted by an Orifice Plate with Tesla-Type Channels
Publisher: MDPI AG
Date: 14-07-2022
DOI: 10.3390/MA15144918
Abstract: A hydrogen depressurization system is required to supply the hydrogen to the fuel cell stack from the storage. In this study, a Tesla-type depressurization construction is proposed. Parallel Tesla-type channels are integrated with the traditional orifice plate structure. A computational fluid dynamics (CFD) model is applied to simulate high-pressure hydrogen flow through the proposed structure, using a commercial software package, ANSYS-Fluent (version 19.2, ANSYS, Inc. Southpointe, Canonsburg, PA, USA). The Peng–Robinson (PR) equation of state (EoS) is incorporated into the CFD model to provide an accurate thermophysical property estimation. The construction is optimized by the parametric analysis. The results show that the pressure reduction performance is improved greatly without a significant increase in size. The flow impeding effect of the Tesla-type orifice structure is primarily responsible for the pressure reduction improvement. To enhance the flow impeding effect, modifications are introduced to the Tesla-type channel and the pressure reduction performance has been further improved. Compared to a standard orifice plate, the Tesla-type orifice structure can improve the pressure reduction by 237%. Under low inlet mass flow rates, introduction of a secondary Tesla-type orifice construction can achieve better performance of pressure reduction. Additionally, increasing parallel Tesla-type channels can effectively reduce the maximum Mach number. To further improve the pressure reduction performance, a second set of Tesla-type channels can be introduced to form a two-stage Tesla-type orifice structure. The study provides a feasible structure design to achieve high-efficiency hydrogen depressurization in hydrogen fuel cell vehicles (HFCVs).
Microstructural feature and tribological behaviors of pyrolytic carbon-coated copper foam/carbon composite
Publisher: Springer Science and Business Media LLC
Date: 26-07-2019
Tamping effect during additive manufacturing of copper coating by cold spray: A comprehensive molecular dynamics study
Publisher: Elsevier BV
Date: 03-2023
Evaluation of pre-shot peening on improvement of carburizing heat treatment of AISI 9310 gear steel
Publisher: Elsevier BV
Date: 05-2022
Modeling texture evolution during ECAP of copper single crystal by crystal plasticity FEM
Publisher: Elsevier BV
Date: 02-2012
High temperature tribological performance of a cost-effective eutectic high entropy alloy Al0.8CrFeNi2.2: Comparison with AlCoCrFeNi2.1
Publisher: Elsevier BV
Date: 06-2023
Characterizing deformation behaviour of an oxidized high speed steel: Effects of nanoindentation depth, friction and oxide scale porosity
Publisher: Elsevier BV
Date: 05-2019
Crystal plasticity investigation of texture evolution of Al single crystal during extrusion through a bent channel
Publisher: American Scientific Publishers
Date: 09-2012
Tribological Behavior of Aqueous Copolymer Lubricant in Mixed Lubrication Regime
Publisher: American Chemical Society (ACS)
Date: 17-02-2016
Abstract: Although a number of experiments have been attempted to investigate the lubrication of aqueous copolymer lubricant, which is applied widely in metalworking operations, a comprehensive theoretical investigation at atomistic level is still lacking. This study addresses the influence of loading pressure and copolymer concentration on the structural properties and tribological performance of aqueous copolymer solution of poly(propylene oxide)-poly(ethylene oxide)-poly(propylene oxide) (PPO-PEO-PPO) at mixed lubrication using a molecular dynamic (MD) simulation. An effective interfacial potential, which has been derived from density functional theory (DFT) calculations, was employed for the interactions between the fluid's molecules and iron surface. The simulation results have indicated that the triblock copolymer is physisorption on iron surface. Under confinement by iron surfaces, the copolymer molecules form lamellar structure in aqueous solution and behave differently from its bulk state. The lubrication performance of aqueous copolymer lubricant increases with concentration, but the friction reduction is insignificant at high loading pressure. Additionally, the plastic deformation of asperity is dependent on both copolymer concentration and loading pressure, and the wear behavior shows a linear dependence of friction force on the number of transferred atoms between contacting asperities.
Coupled effects of initial orientation scatter and grain-interaction to texture evolution: a crystal plasticity FE study
Publisher: Springer Science and Business Media LLC
Date: 21-04-2019
Rolling-sliding contact fatigue failure and associated evolutions of microstructure, crystallographic orientation and residual stress of AISI 9310 gear steel
Publisher: Elsevier BV
Date: 05-2023
Influence of temperature and local structure on the shear-coupled grain boundary migration
Publisher: Wiley
Date: 10-10-2017
Crystal plasticity modeling of texture evolution and heterogeneity in equal channel angular pressing of aluminum single crystal
Publisher: Elsevier BV
Date: 05-2011
Excellent tribological performance at elevated temperatures and associated mechanisms of novel AlCoCrFeNi-MoS2 solid self-lubricating composite
Publisher: Elsevier BV
Date: 11-2023
Atomic-scale anisotropy of nanoscratch behavior of single crystal iron
Publisher: Elsevier BV
Date: 10-2009
Crack propagation behavior in white etching layer on rail steel surface
Publisher: Elsevier BV
Date: 10-2019
Effect of MWCNT content on conductivity and mechanical and wear properties of copper foam/resin composite
Publisher: Elsevier BV
Date: 07-2019
Study of anisotropic plastic behavior in high pressure torsion of aluminum single crystal by crystal plasticity finite element method
Publisher: MDPI AG
Date: 06-12-2017
DOI: 10.3390/CRYST7120362
Effect of cryogenic temperature equal channel angular pressing on microstructure, bulk texture and tensile properties of AA1050
Publisher: Elsevier BV
Date: 04-2020
Characterization of microstructure and mechanical property of pure titanium with different Fe addition processed by severe plastic deformation and subsequent annealing
Publisher: IOP Publishing
Date: 05-2017
Crystal plasticity investigation of friction effect on texture evolution of Al single crystal during ECAP
Publisher: Springer Science and Business Media LLC
Date: 10-06-2010
Annealing behavior of accumulative roll bonding processed aluminum composites
Publisher: Wiley
Date: 19-06-2013
Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding
Publisher: Elsevier BV
Date: 09-2014
Excellent combination of compressive strength and ductility of (CoCrFeNi) (Co0.26Cr0.07Fe0.16Ni0.31Hf0.4) high-entropy alloys
Publisher: Elsevier BV
Date: 04-2021
Thermo-mechanical coupled finite element analysis of rolling contact fatigue and wear properties of a rail steel under different slip ratios
Publisher: Elsevier BV
Date: 2020
Effects of normal load and velocity on the dry sliding tribological behaviour of CoCrFeNiMo0.2 high entropy alloy
Publisher: Elsevier BV
Date: 04-2020
Fabrication and characterization of a low-cost Co-free Al0.8CrFeNi2.2 eutectic high entropy alloy based solid self-lubricating composite: Microstructure, mechanical and wear properties
Publisher: Elsevier BV
Date: 12-2022
Finite element analysis of high pressure torsion
Publisher: Wiley
Date: 07-06-2013
A damping boundary condition for atomistic-continuum coupling
Publisher: IOP Publishing
Date: 05-2017
On the strain hardening abilities of α+β titanium alloys: The roles of strain partitioning and interface length density
Publisher: Elsevier BV
Date: 11-2019
Numerical Simulation of Temperature Field and Thermal Stress Field of Work Roll During Hot Strip Rolling
Publisher: Springer Science and Business Media LLC
Date: 05-2007
Study on Lubrication Characteristics of C4-Alkane and Nanoparticle during Boundary Friction by Molecular Dynamics Simulation
Publisher: MDPI AG
Date: 15-09-2021
DOI: 10.3390/MET11091464
Abstract: Lubricant has been widely applied to reduce wear and friction between the contact surfaces when they are in relative motion. In the current study, a nonequilibrium molecular dynamics (NEMD) simulation was specifically established to conduct a comprehensive investigation on the dynamic contact between two iron surfaces in a boundary friction system considering the mixed C4-alkane and nanoparticles as lubricant. The main research objective was to explore the effects of fluid and nanoparticles addition on the surface contact and friction force. It was found that nanoparticles acted like ball bearings between the contact surfaces, leading to a change of sliding friction mode to rolling friction mode. Under normal loads, plastic deformation occurred at the top surface because nanoparticles were mainly supporting the normal load. By increasing the number of C4-alkane molecules between two contact surfaces, the contact condition has been changed from partial to full lubrication. In addition, an attractive force from the solid–liquid LJ interaction between C4-alkane and surfaces was observed at the early stage of sliding, due to the large space formed by wall surfaces and nanoparticles. The findings in this paper would be beneficial for understanding the frictional behavior of a simple lubricant with or without nanoparticles addition in a small confinement.
Hertz Contact at the Nanoscale with a 3D Multiscale Model
Publisher: Trans Tech Publications, Ltd.
Date: 07-2016
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.846.306
Abstract: This paper presents a three-dimensional multiscale computational model, which is proposed to combine the simplicity of FEM model and the atomistic interactions between two solids. A significant advantage of the model is that atoms are populated in the contact regions, which saves significant computation time compared to fully MD simulations. The model is used in the case of asperity contact. The normal displacement, contact radius and pressure distribution are compared with those from Hertz’s solution and atomistic simulations in the literature. Some important features of nanoscale contacts obtained by MD simulations can be caught by the model with acceptable accuracy and low computational cost.
In-situ interfacial tribochemistry toward eliminating red-scale of silicon steel in friction process
Publisher: Elsevier BV
Date: 03-2020
Effect of Pyrolytic Carbon Interface Thickness on Conductivity and Tribological Properties of Copper Foam/Carbon Composite
Publisher: Springer Science and Business Media LLC
Date: 09-01-2021
Effect of high pressure torsion process on the microhardness, microstructure and tribological property of Ti6Al4V alloy
Publisher: Elsevier BV
Date: 12-2021
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