Effect of thermal annealing on nanoimprinted Cu–Ni alloys using molecular dynamics simulation

Fang, Te-Hua; Wu, Cheng-Da; Chang, Win−Jin; Chi, Sung-Shui

doi:10.1016/j.apsusc.2009.01.069

Cited by 31 publications

(4 citation statements)

References 19 publications

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“…Based on earlier literature [82][83][84][85][86], the von Mises stress is utilized to compute the local stress of the workpiece using the following method:…”

Section: Methodologiesmentioning

confidence: 99%

Mechanics of AlCuNiTi alloy orthogonal micro-cutting

Nguyen,

Fang

2023

Modelling Simul. Mater. Sci. Eng.

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The mechanical behavior of AlCuNiTi alloy during orthogonal micro-cutting consists of conventional cutting and complex-dimensional vibration cutting (CDVC) are investigated using molecular dynamics (MD). The material removal mechanism is studied in terms of phase angle, amplitude ratio, and vibration frequency. In both techniques, the stress and strain are localized in the contiguous location between the sample and the cutting tool. The sample temperature during CDVC is noticeably greater than during classical cutting, which might benefit the transition phase and make CDVC smoother. The total mean value cutting force of the CDVC decreases as the frequencies of vibration and ratios of amplitude increase; however, the mean values of force under the CDVC with different phase angles demonstrate hardly ever statistically significant change. The quantity of atoms in the chip indicates that the machined surface rate is higher under the CDVC, with a higher frequency of vibration, smaller phase angle, and amplitude ratio. Under CDVC, the chip of plastic deformation gets more pronounced and severe with a frequency of oscillation at 150 GHz, an amplitude at 1.5, and a phase angle degree of 75○ due to the lowest cutting ratio.

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“…Based on earlier literature [82][83][84][85][86], the von Mises stress is utilized to compute the local stress of the workpiece using the following method:…”

Section: Methodologiesmentioning

confidence: 99%

Mechanics of AlCuNiTi alloy orthogonal micro-cutting

Nguyen,

Fang

2023

Modelling Simul. Mater. Sci. Eng.

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“…The stress distribution of the NiCoCr MEA specimens was provided by the atomic von Mises stress. According to the literature [24,36], the atomic von Mises stress (σ v ) of a polycrystalline specimen can be illustrated in following equation: The stress on the atomic scale was used to describe the effects of residual stress in the NiCoCr MEA specimens during the compression process [34,37],…”

Section: Methodologiesmentioning

confidence: 99%

Buckling instability and compressive deformation of Ni-Co-Cr medium-entropy alloy nanotubes

Lu¹,

Fang²

2022

Modelling Simul. Mater. Sci. Eng.

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The aspect ratio has a significant effect on buckling instability. In this study, we used molecular dynamics (MD) simulation to investigate the buckling instability mechanism of NiCoCr medium-entropy alloy (MEA) nanotubes under the compression process. Based on the compression results, we find that the buckling point and the critical buckling stress decrease with increasing aspect ratio. The critical buckling stress of the MD simulations resembles the Euler and Rayleigh-Ritz theories. The critical aspect ratio of 10 showed instability at NiCoCr nanotubes. In addition, we found that the compressive strength of single-crystalline specimens is much higher than that of polycrystalline specimens. Partial dislocations (PDs) dominated by stacking faults (SFs) and twinning structures are mainly distributed on the grain boundaries of small grain specimens and decrease with increasing grain size. We also found that polycrystalline structures tend to induce buckling instability. The wall thickness specimen of the 7 nm has confirmed similar compressive strength as the nanowire. The compressive strength decreases as the wall thickness decreases. More stress concentration and PDs distributed in the specimen when the wall thickness is reduced to 1 nm, and it is easier to induce buckling instability at NiCoCr MEA nanotubes.

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“…Kang et al [ 29 , 30 ] pointed out that the aspect ratio and shape of the mold insert had different effects on the stress distribution of the structure. Fang et al [ 31 ] believed that the higher the temperature, the greater the shear strain of the atoms around the mold.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Residual Stresses in Micro-Injection Molding of PMMA: A Molecular Dynamics Simulation

et al. 2020

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Injection molding is an economical and effective method for manufacturing polymer parts with nanostructures and residual stress in the parts is an important factor affecting the quality of molding. In this paper, taking the injection molding of polymethyl methacrylate (PMMA) polymer in a nano-cavity with an aspect ratio of 2.0 as an example, the formation mechanism of residual stresses in the injection molding process was studied, using a molecular dynamics simulation. The changes in dynamic stress in the process were compared and analyzed, and the morphological and structural evolution of molecular chains in the process of flow were observed and explained. The effects of different aspect ratios of nano-cavities on the stress distribution and deformation in the nanostructures were studied. The potential energy, radius of gyration and elastic recovery percentage of the polymer was calculated. The results showed that the essence of stress formation was that the molecular chains compressed and entangled under the flow pressure and the restriction of the cavity wall. In addition, the orientation of molecular chains changed from isotropic to anisotropic, resulting in the stress concentration. At the same time, with the increase in aspect ratio, the overall stress and deformation of the nanostructures after demolding also increased.

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Effect of thermal annealing on nanoimprinted Cu–Ni alloys using molecular dynamics simulation

Cited by 31 publications

References 19 publications

Mechanics of AlCuNiTi alloy orthogonal micro-cutting

Mechanics of AlCuNiTi alloy orthogonal micro-cutting

Buckling instability and compressive deformation of Ni-Co-Cr medium-entropy alloy nanotubes

Formation Mechanism of Residual Stresses in Micro-Injection Molding of PMMA: A Molecular Dynamics Simulation

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