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Structural Engineering and Mechanics
  Volume 66, Number 2, April25 2018, pages 249-262
DOI: http://dx.doi.org/10.12989/sem.2018.66.2.249
 


Three dimensional dynamic response of functionally graded nanoplates under a moving load
Shahrokh Hosseini-Hashemi and Hossein Bakhshi Khaniki

 
Abstract
    In this paper, reaction of functionally graded (FG) thick nanoplates resting on a viscoelastic foundation to a moving nanoparticle/load is investigated. Nanoplate is assumed to be thick by using second order shear deformation theory and small-scale effects are taken into account in the framework of Eringen\'s nonlocal theory. Material properties are varied through the thickness using FG models by having power-law, sigmoid and exponential functions for material changes. FG nanoplate is assumed to be on a viscoelastic medium which is modeled using Kelvin-Voight viscoelastic model. Galerkin, state space and fourth-order Runge-Kutta methods are employed to solve the governing equations. A comprehensive parametric study is presetned to show the influence of different parameters on mechanical behavior of the system. It is shown that material variation in conjunction with nonlocal term have a significant effect on the dynamic deformation of nanoplate which could be used in comprehending and designing more efficient nanostructures. Moreover, it is shown that having a viscoelastic medium could play an important role in decreasing these dynamic deformations. With respect to the fresh studies on moving atoms, molecules, cells, nanocars, nanotrims and point loads on different nanosctructures using scanning tunneling microscopes (STM) and atomic force microscopes (AFM), this study could be a step forward in understanding, predicting and controlling such kind of behaviors by showing the influence of the moving path, velocity etc. on dynamic reaction of the plate.
 
Key Words
    functionally graded material; forced deformation; FGM; nanoplate; second order shear deformation; moving load
 
Address
Shahrokh Hosseini-Hashemi:
1) School of Mechanical Engineering, Iran University of Science and Technology, Narmak, 16846-13114, Tehran, Iran
2) Center of Excellence in Railway Transportation, Iran University of Science and Technology, Narmak, 16842-13114, Tehran, Iran
Hossein Bakhshi Khaniki: School of Mechanical Engineering, Iran University of Science and Technology, Narmak, 16846-13114, Tehran, Iran
 

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