Mechanical and vibrational characteristics of functionally graded Cu–Ni nanowire: A molecular dynamics study
Mahmudul Islam,Shajedul Hoque Thakur,Satyajit Mojumder,Satyajit Mojumder,Abdullah Al Amin,Mahbubul Islam +5 more
TLDR
In this article, the authors employed molecular dynamics simulations to investigate the mechanical and vibrational properties of radially graded Cu-Ni FGM nanowires (NWs) and found that the distribution of Cu and Ni along the radial direction follows power-law, exponential and sigmoid functions for FGM NWs under consideration.Abstract:
Functionally graded material (FGM) is a class of advanced materials, consisting of two (or more) different constituents, that possesses a continuously varying composition profile. With the advancement of nanotechnology, applications of FGMs have shifted from their conventional usage towards sophisticated micro and nanoscale electronics and energy conversion devices. Therefore, the study of mechanical and vibrational properties of different FGM nanostructures is crucial in exploring their feasibility for different applications. In this study, for the first time, we employed molecular dynamics (MD) simulations to investigate the mechanical and vibrational properties of radially graded Cu–Ni FGM nanowires (NW). Distribution of Cu and Ni along the radial direction follows power-law, exponential and sigmoid functions for FGM NWs under consideration. Our results demonstrate that distribution function parameters play an important role in modulating the mechanical (elastic modulus and ultimate tensile strength) and vibrational (natural frequency and quality factor) properties of FGM NWs. The study also suggests that elastic moduli of FGM NWs can be predicted with relatively good accuracy using Tamura and Reuss micromechanical models, regardless of NW diameter. We found that Euler-Bernoulli beam theory under-predicts the natural frequencies of FGM NWs, whereas He-Lilley model closely approximates the MD results. Interestingly, FGM NWs are always found to exhibit beat vibration because of their asymmetrical cross sections. Finally, this is the first atomistic scale study of FGMs that directly compares MD simulations with continuum theories and micromechanical models to understand the underlying mechanisms that govern the mechanical and vibrational properties of FGM NWs in nanoscale.read more
Citations
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Fast parallel algorithms for short-range molecular dynamics
TL;DR: Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems.
Thermoelastic Damping in Micro- and Nano-Mechanical Systems.
Ron Lifshitz,Michael L. Roukes +1 more
Abstract: The importance of thermoelastic damping as a fundamental dissipation mechanism for small-scale mechanical resonators is evaluated in light of recent efforts to design high-Q micrometer- and nanometer-scale electromechanical systems. The equations of linear thermoelasticity are used to give a simple derivation for thermoelastic damping of small flexural vibrations in thin beams. It is shown that Zener’s well-known approximation by a Lorentzian with a single thermal relaxation time slightly deviates from the exact expression.
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The effect of silver coated copper particle content on the properties of novel Cu-Ag alloys prepared by hot pressing method
TL;DR: In this paper, the properties of novel Cu-Ag alloys reinforced with silver-coated copper particles fabricated by hot pressing were systematically discussed for the first time, and the effect of silver coated copper particle content on the microstructure, density, hardness, tensile strength and oxidation resistance of the alloys were investigated in detail.
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On the calibration of size parameters related to non-classical continuum theories using molecular dynamics simulations
TL;DR: In this article, the calibration of small-scale parameters of non-classical continuum theories such as nonlocal strain gradient theory, strain gradients theory, stress-driven nonlocal elasticity, and strain-driven NLI elasticity was discussed.
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Functional Gradient Metallic Biomaterials: Techniques, Current Scenery, and Future Prospects in the Biomedical Field.
TL;DR: In this paper, the authors reviewed the current scenery of FGM metallic materials in the biomedical field, specifically its dental and orthopedic applications, and introduced various processing methods, especially additive manufacturing methods that have a substantial impact on FGM production, mentioning its prospects and how FGMs can change the direction of both industry and biomedicine.
References
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Fast parallel algorithms for short-range molecular dynamics
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Fast parallel algorithms for short-range molecular dynamics
TL;DR: Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems.
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A variational approach to the theory of the elastic behaviour of multiphase materials
Zvi Hashin,S. Shtrikman +1 more
TL;DR: In this paper, the authors derived upper and lower bounds for the effective elastic moduli of quasi-isotropic and quasi-homogeneous multiphase materials of arbitrary phase geometry.