Molecular Dynamics Simulation of Nanometric Machining Under Realistic Cutting Conditions

2008 ◽  
Author(s):  
R. Promyoo ◽  
H. El-Mounayri ◽  
X. Yang
Keyword(s):  
Molecular Dynamics ◽  
Cutting Force ◽  
Chip Formation ◽  
Thrust Force ◽  
Cutting Speed ◽  
Md Simulations ◽  
Rake Angle ◽  
Dynamics Simulation ◽  
Depth Of Cut ◽  
Nanometric Machining

Molecular Dynamics (MD) simulations of nanometric machining of single-crystal copper were conducted at a conventional cutting speed (5m/s) and different depths of cut (0.724 – 2.172 nm). The simulations were carried out to predict cutting forces and investigate the mechanism of chip formation at the nano level. The effect of tool rake angles and depths of cut on the mechanism of chip formation were also investigated. Tools with different rake angles, namely 0°, 5°, 10°, 15°, 30°, and 45°, were used. It was found that the cutting force, thrust force, and the ratio of the thrust force to cutting force decrease with increasing rake angle. However, the ratio of the thrust force to the cutting force is found to be independent of the depth of cut.

scholarly journals Experiments in the Machining of Ice at Negative Rake Angles

1984 ◽  
Vol 30 (104) ◽  
pp. 77-81 ◽  
Author(s):  
D.K. Lieu ◽  
C.D. Mote
Keyword(s):  
Cutting Force ◽  
Chip Formation ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Rake Angle ◽  
Cutting Depth ◽  
Orthogonal Machining ◽  
Cutting Force Components ◽  
Force Components

AbstractThe cutting force components and the cutting moment on the cutting tool were measured during the orthogonal machining of ice with cutting tools inclined at negative rake angles. The variables included the cutting depth (< 1 mm), the cutting speed (0.01 ms−1to 1 ms−1), and the rake angles (–15° to –60°). Results of the experiments showed that the cutting force components were approximately independent of cutting speed. The resultant cutting force on the tool was in a direction approximately normal to the cutting face of the tool. The magnitude of the resultant force increased with the negative rake angle. Photographs of ice-chip formation revealed continuous and segmented chips at different cutting depths.

Choosing Appropriate Interatomic Potentials for Nanometric Molecular Dynamics (MD) Simulations

2016 ◽  
Vol 686 ◽  
pp. 194-199
Author(s):  
Akinjide O. Oluwajobi ◽  
Xun Chen
Keyword(s):  
Molecular Dynamics ◽  
Diamond Tool ◽  
Md Simulations ◽  
Dynamics Simulation ◽  
Interatomic Potentials ◽  
Embedded Atom ◽  
Pair Potentials ◽  
Empirical Potentials ◽  
Nanometric Machining ◽  
Cutting Processes

There is a need to choose appropriate interatomic empirical potentials for the molecular dynamics (MD) simulation of nanomachining, so as to represent chip formation and other cutting processes reliably. Popularly applied potentials namely; Lennard-Jones (LJ), Morse, Embedded Atom Method (EAM) and Tersoff were employed in the molecular dynamics simulation of nanometric machining of copper workpiece with diamond tool. The EAM potentials were used for the modelling of the copper-copper atom interactions. The pairs of EAM-Morse and EAM-LJ were used for the workpiece-tool (copper-diamond) atomic interface. The Tersoff potential was used for the carbon-carbon interactions in the diamond tool. Multi-pass simulations were carried out and it was observed that the EAM-LJ and the EAM-Morse pair potentials with the tool modelled as deformable with Tersoff potential were best suitable for the simulation. The former exhibit the lowest cutting forces and the latter has the lowest potential energy.

Experiment Study of Chip Formation and Cutting Force of Hardened AISI 1045 Steel in High Speed Machining

2011 ◽  
Vol 383-390 ◽  
pp. 1915-1920
Author(s):  
Guo He Li ◽  
Bing Yan ◽  
Yu Jun Cai
Keyword(s):  
Cutting Force ◽  
Chip Formation ◽  
Sudden Change ◽  
Cutting Speed ◽  
Rake Angle ◽  
Adiabatic Shear ◽  
Cutting Depth ◽  
Serrated Chip ◽  
1045 Steel ◽  
Aisi1045 Steel

Orthogonal cutting experiments of hardness AISI1045 steel( HRC45) are performed. The change of chip formation and cutting force with cutting conditions are investigated through metallurgical observation, and the critical cutting speed of adiabatic shear of AISI1045 steel at different cutting depths and rake angles are given. In addition, the saw-frequency and space length of serrated chip and the influence of serrated chip on cutting force are also studied. The critical cutting speed decreases with the increase of cutting depth, but increases with the increase of rake angle. The saw-frequency of serrated chip is found to be independent of the cutting depth, and increases with the increase of cutting speed and rake angle. The cutting force decreases with the increase of cutting speed and rake angle, but increases with the increase of cutting depth, and there isn’t a sudden change of cutting force at the onset of adiabatic shear.

In Vitro Experimental and Numerical Analysis of Forces in Plane Cutting of Cortical Bone

2015 ◽  
Vol 799-800 ◽  
pp. 509-514
Author(s):  
Khurshid Alam ◽  
Riaz Muhammad ◽  
Vadim Silberschmidt
Keyword(s):  
Cutting Force ◽  
Bone Tissue ◽  
Cutting Tool ◽  
Cutting Speed ◽  
Rake Angle ◽  
Fe Analysis ◽  
Depth Of Cut ◽  
Bone Surface ◽  
Surgical Incision

Bone cutting is a well know procedure in orthopedics. Large cutting force causes overstressing of the bone which may result in trauma. Control penetration of the cutting tool into bone tissue is important to avoid unnecessary damage to the bone tissue. The purpose of this study was to measure and predict cutting force using experiments and Finite Element (FE) analysis when a plane cutter passes over the bone surface in the presence of irrigation. The effect of cutting speed, tool rake angle, depth of cut and width of the cutting face on the cutting force was found. The force was found to decrease with increase in rake angle and significantly rise with increase in depth of cut and width of cutting face. The cutting force was found unaffected by the range of cutting speed used in experiment as well as in simulations. The results obtained from this study strongly recommend the use of irrigation to minimize plane cutting force or force arising from similar cutting action for safe and efficient surgical incision in bone.

MOLECULAR DYNAMICS SIMULATION OF NANOMETRIC CUTTING PROCESS

2006 ◽  
Vol 05 (04n05) ◽  
pp. 633-638
Author(s):  
Q. X. PEI ◽  
C. LU ◽  
F. Z. FANG ◽  
H. WU
Keyword(s):  
Molecular Dynamics ◽  
Cutting Force ◽  
Chip Formation ◽  
Md Simulation ◽  
Cutting Process ◽  
Atomic Scale ◽  
Dynamics Simulation ◽  
Tool Geometry ◽  
Nanometric Cutting ◽  
Eam Potential

Nanoscale machining involves changes in only a few atomic layers at the surface. Molecular dynamics (MD) simulation can play a significant role in addressing a number of machining problems at the atomic scale. In this paper, we employed MD simulations to study the nanometric cutting process of single crystal copper. Instead of the widely used Morse potential, we used the Embedded Atom Method (EAM) potential for this study. The simulations were carried out for various tool geometries at different cutting speeds. Attention was paid to the cutting chip formation, the cutting surface morphology and the cutting force. The MD simulation results show that both the tool geometry and the cutting speed have great influence on the chip formation, the smoothness of machined surface and the cutting force.

Molecular Dynamics Simulation Study of Grinding Process of Mg-Al Alloy

2013 ◽  
Vol 820 ◽  
pp. 75-79 ◽  
Author(s):  
Cai Xia Li ◽  
Yu Luo
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Morse Potential ◽  
Cutting Speed ◽  
Dynamics Simulation ◽  
Depth Of Cut ◽  
Al Alloy ◽  
Grinding Process ◽  
Embedded Atom ◽  
Eam Potential

A molecular dynamics simulation considered of chip deformation and force analysis for grinding process of Mg-Al alloy is presented. Hybrid potentials including embedded atom method (EAM) potential and Morse potential are applied in this model. The activities among atoms of Mg-Al Alloy material is described by EAM potential which is very suitable for metal materials. Morse potential is used to realize the interaction between Mg-Al alloy and abrasive grain made of diamond. Simulations of Different depths of cut (0.6nm, 0.8nm and 1.0nm) and different cut speeds (50m/s, 100m/s and 200m/s) are given. The experience result shows that with the same nanometric depth of cut, there is a little difference of ratio of the cut potential to the cutting speed. Moreover, with the same cutting speed, the cut potential is increased linearly with the depth of cut while reaching to stable cutting regime.

scholarly journals Interface-governed nanometric machining behaviour of Cu/Ag bilayers using molecular dynamics simulation

RSC Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 1341-1353 ◽  
Author(s):  
Qihong Fang ◽  
Yuanyuan Tian ◽  
Jia Li ◽  
Qiong Wang ◽  
Hong Wu
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Md Simulations ◽  
Dynamics Simulation ◽  
Cu Film ◽  
Nanometric Machining ◽  
Pure Cu

The nanometric machining of Cu/Ag bilayers and pure Cu film is performed using molecular dynamics (MD) simulations.

Experiments in the Machining of Ice at Negative Rake Angles

1984 ◽  
Vol 30 (104) ◽  
pp. 77-81 ◽  
Author(s):  
D.K. Lieu ◽  
C.D. Mote
Keyword(s):  
Cutting Force ◽  
Chip Formation ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Rake Angle ◽  
Cutting Depth ◽  
Orthogonal Machining ◽  
Cutting Force Components ◽  
Force Components

AbstractThe cutting force components and the cutting moment on the cutting tool were measured during the orthogonal machining of ice with cutting tools inclined at negative rake angles. The variables included the cutting depth (< 1 mm), the cutting speed (0.01 ms−1 to 1 ms−1), and the rake angles (–15° to –60°). Results of the experiments showed that the cutting force components were approximately independent of cutting speed. The resultant cutting force on the tool was in a direction approximately normal to the cutting face of the tool. The magnitude of the resultant force increased with the negative rake angle. Photographs of ice-chip formation revealed continuous and segmented chips at different cutting depths.

Determination of the Minimum Depth of Cut in Nanometric Machining Using Molecular Dynamics Simulation

2012 ◽  
Vol 565 ◽  
pp. 570-575
Author(s):  
Akinjide Oluwajobi ◽  
Xun Chen
Keyword(s):  
Molecular Dynamics ◽  
Md Simulation ◽  
Chip Thickness ◽  
Dynamics Simulation ◽  
Depth Of Cut ◽  
Limiting Factor ◽  
Nanometric Machining ◽  
Minimum Depth ◽  
Achievable Accuracy

The Minimum Depth of Cut (MDC) is a major limiting factor on achievable accuracy in nanomachining, because the generated surface roughness is primarily attributed to the ploughing process when the uncut chip thickness is less than the MDC. This paper presents an evaluation of a cutting process where a sharp diamond tool with an edge radius of few atoms acts on a crystalline copper workpiece. The molecular dynamics (MD) simulation results show the phenomena of rubbing, ploughing and cutting. The formation of chip occurred from the depth of cut thickness of 1-1.5nm.

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