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RISS 인기검색어
- 검색키워드
- 저자 : Yaghoub Tadi Beni (검색결과 5 건)
- 무료
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Yaghoub Tadi Beni,Iman Karimipöur,Mohamadreza Abadyan 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
Experimental observations reveal that the physical response of nanostructures is size-dependent. Herein, modified couple stress theoryhas been used to study the effect of intermolecular van der Waals force on the size dependent pull-in of nanobridges and nanocantilevers. Three approaches including using differential transformation method, applying numerical method and developing a simple lumped parametermodel have been employed to solve the governing equation of the systems. The pull-in parameters i.e. critical tip deflection andinstability voltage of the nanostructures have been determined. Effect of the van der Waals attraction and the size dependency and theimportance of coupling between them on the pull-in performance have been discussed.
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Fahimeh Mehralian,Yaghoub Tadi Beni 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.4
In the present study, the buckling of piezoelectric cylindrical nanoshell subjected to an axial compression, an applied voltage and uniform temperature change resting on Winkler-Pasternak foundation is studied analytically. The modified couple stress theory combined with the geometrical nonlinear shell model is employed to derive the equilibrium equations and boundary conditions. The numerical results are proposed for the buckling of simply supported cylindrical nanoshell using the Navier-type solution. Thus, the effects of different parameters such as dimensionless length scale parameter, length and thickness to radius ratio, temperature change, external electric voltage and Winkler and Pasternak foundation stiffness on critical buckling load are illustrated. It is shown that increase in dimensionless length scale parameter results in increasing critical buckling load and even intensifying the influence of other parameters, such as length and thickness, on critical buckling load.
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Electro-mechanical vibration of nanoshells using consistent size-dependent piezoelectric theory
Narges Ebrahimi,Yaghoub Tadi Beni 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.22 No.6
In this paper, the free vibrations of a short cylindrical nanotube made of piezoelectric material are studied based on the consistent couple stress theory and using the shear deformable cylindrical theory. This new model has only one length scale parameter and can consider the size effects of nanostructures in nanoscale. To model size effects in nanoscale, and considering the nanotube material which is piezoelectric, the consistent couple stress theory is used. First, using Hamilton's principle, the equations of motion and boundary condition of the piezoelectric cylindrical nanoshell are developed. Afterwards, using Navier approach and extended Kantorovich method (EKM), the governing equations of the system with simple-simple (S-S) and clamped-clamped (C-C) supports are solved. Afterwards, the effects of size parameter, geometric parameters (nanoshell length and thickness), and mechanical and electric properties (piezoelectric effect) on nanoshell vibrations are investigated. Results demonstrate that the natural frequency on nanoshell in nanoscale is extremely dependent on nanoshell size. Increase in size parameter, thickness and flexoelectric effect of the material leads to increase in frequency of vibrations. Moreover, increased nanoshell length and diameter leads to decreased vibration frequency.
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Hosein Ataei,Yaghoub Tadi Beni,Milad Shojaeian 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.4
Pull-in instability and free vibration of cantilever and clamped-clamped beam-type nanoactuators, which are made of Functionally graded materials (FGMs), are investigated using the Modified strain gradient theory (MSGT) under the influence of electrostatic and intermolecular forces. It is assumed that the functionally graded nano-beam made of nickel and silicon nitride and mechanical properties of the nano-beam vary continuously and smoothly in the thickness direction by a simple power-law distribution. Differential quadrature method (DQM), Differential transformation method_Pade approximant (DTM_Pade) and Lumped parameter model (LPM) are used to solve the nonlinear governing equation of the nano-beam, and the obtained results from these methods are compared together. In the end, the effects of size, variation of the length scale parameter, and the volume fraction are discussed and examined. The results show that there are a good agreement between the MSGT and the experimental results, so it can be conclude that the size effect has a substantial impact on the pull-in instability and free vibration results of the beam-type micro/nanoactuator.
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Effect of laminate configuration on the free vibration/buckling of FG Graphene/PMMA composites
Zeverdejani, Mehran Karimi,Beni, Yaghoub Tadi Techno-Press 2020 Advances in nano research Vol.8 No.2
In this research, buckling and free vibration of rectangular polymeric laminate reinforced by graphene sheets are investigated. Various patterns are considered for augmentation of each laminate. Critical buckling load is evaluated for different parameters, including boundary conditions, reinforcement pattern, loading regime, and laminate geometric states. Furthermore, vibration analysis is investigated for square laminate. Elastic properties of the composite are calculated using a combination of both molecular dynamics (MD) and the rule of mixture (MR). Kinematics of the plate is approximated based on the first shear deformation theory (FSDT). The current analysis is performed based on the energy method. For the numerical investigation, Ritz method is applied, and for shape functions, Chebyshev polynomials are utilized. It is found that the number of layers is effective on the buckling load and natural frequency of laminates which made from non-uniform layers.
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