Characterization of Atomic Surface Roughness in Nanometric Machining Molecular Dynamics (MD) Simulations

Oluwajobi, Akinjide O.; Chen, Xun

doi:10.2174/1573413712666160530123555

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…Nano-surface finish, submicron geometric accuracy, and complex machining shapes can be obtained through nano-cutting. [6][7][8][9] For instance, Oluwajobi, AO et al 10 studied the influence of cutting velocity and cutting depth on surface roughness and found that the surface roughness can reach 0.1-0.3 nm by the nanocutting method. Because of its difficult machining characteristics and high cost, the existing experimental methods are no longer the best processing methods for brittle and hard materials like SiC.…”

Section: Introductionmentioning

confidence: 99%

Influence of the metal coating on nano-cutting process of cubic silicon carbide

Hu,

Dai

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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The effect of the metal coating on the machinability of cubic silicon carbide was investigated by molecular dynamics simulation. The effect of the metal coating on the surface of the workpiece was explained using cutting force, friction coefficient, surface morphology, stress, temperature, and tool wear. The results show that the influence of metal type on cutting force, surface morphology, and stress is insignificant for coating thickness. However, the model with Cu coating has a tool suspension key number of 400 at the maximum cutting distance. The number of tool suspension keys for the Ni-Ti coating model is around 1700, indicating that the type of coating has a significant impact on tool wear. Furthermore, the results also show that in the three metals of Cu, Ni and Ni -Ti, Cu coating has the greatest impact on improving cutting performance. Among them, the average cutting force of 1.5 nm Cu coating is about 33.3% lower than that of without coating, and the tool wear is about 26.7% lower. These results demonstrate the effects of the metal coating on the workpiece surface from a theoretical point of view.

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Section: Introductionmentioning

confidence: 99%

Influence of the metal coating on nano-cutting process of cubic silicon carbide

Hu,

Dai

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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Edge chipping minimisation strategy for milling of monocrystalline silicon: A molecular dynamics study

Choong

Huo

Degenaar

et al. 2019

Applied Surface Science

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Direct patterning of functional microstructures on monocrystalline silicon by mechanical micro-milling has drawn intense interests as an alternative to the conventional lithographybased technique in microelectronics fabrication. Despite the micro milling offers advantages such as versatility and low operating cost, machining induced defects such as edge chipping occur on the surface edges of a finished product and may affect its functionality. To address such challenge, a novel hybrid technique that combines mechanical machining and the deposition of a layered sacrificial structure on the silicon surface was proposed to minimise the machining induced edge chipping. In this paper, the cutting mechanism of silicon under the proposed hybrid technique has been studied by molecular dynamics simulation. Fundamental mechanisms such as material deformation, chip formation and stress behaviour are analysed.Reduction of stress intensity and machining forces has been observed when silicon was machined under the proposed hybrid conditions. The effect is believed to be contributed by thermal softening, resulted from the high cutting temperature and interfacial stress between the copper and silicon layers. In addition, machining silicon by the proposed hybrid technique also showed desirable properties which include low subsurface damages, large material removal rate and better surface finishing (Ra<0.1 nm). The results further enriched the machining theory and justified the feasibility for the proposal of such a hybrid technique.

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Five Inputs Code Lock Circuit Design Based on DNA Strand Displacement Mechanism

Sun

et al. 2019

NANO

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In recent years, the development of biological computers is becoming faster and faster, in order to make the logical operation algorithms of biological computers more mature and stable, a new idea for the code lock logic circuit is proposed based on DNA strand displacement by using the dual-rail method. The code lock is designed by four input signals and one conversion input signal. Only when the four input codes are correct and the conversion signal code is turned on, the password lock will be in open state, otherwise the password lock will produce an alarm signal, stopping outside invasion timely. The information of key is processed to obtain the correct password; finally, the experimental simulation results are obtained by Visual DSD software. The results analysis show that the designed code lock circuit is effective, which may provide a good technical support and a good theoretical basis in biological computers development.

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Characterization of Atomic Surface Roughness in Nanometric Machining Molecular Dynamics (MD) Simulations

Cited by 3 publications

References 21 publications

Influence of the metal coating on nano-cutting process of cubic silicon carbide

Influence of the metal coating on nano-cutting process of cubic silicon carbide

Edge chipping minimisation strategy for milling of monocrystalline silicon: A molecular dynamics study

Five Inputs Code Lock Circuit Design Based on DNA Strand Displacement Mechanism

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