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Advances in Nano Research
  Volume 7, Number 3, May 2019 , pages 157-167

Hygro-thermal effects on wave dispersion responses of magnetostrictive sandwich nanoplates
Farzad Ebrahimi, Ali Dabbagh, Francesco Tornabene and Omer Civalek

    In this paper, a classical plate model is utilized to formulate the wave propagation problem of magnetostrictive sandwich nanoplates (MSNPs) while subjected to hygrothermal loading with respect to the scale effects. Herein, magnetostriction effect is considered and controlled on the basis of a feedback control system. The nanoplate is supposed to be embedded on a visco-Pasternak substrate. The kinematic relations are derived based on the Kirchhoff plate theory; also, combining these obtained equations with Hamilton\'s principle, the local equations of motion are achieved. According to a nonlocal strain gradient theory (NSGT), the small scale influences are covered precisely by introducing two scale coefficients. Afterwards, the nonlocal governing equations can be derived coupling the local equations with those of the NSGT. Applying an analytical solution, the wave frequency and phase velocity of propagated waves can be gathered solving an eigenvalue problem. On the other hand, accuracy and efficiency of presented model is verified by setting a comparison between the obtained results with those of previous published researches. Effects of different variants are plotted in some figures and the highlights are discussed in detail.
Key Words
    wave propagation; magnetostrictive materials; nonlocal strain gradient theory (NSGT); sandwich nanoplates; hygro-thermal environments
(1) Farzad Ebrahimi, Ali Dabbagh:
Department of Mechanical Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran;
(2) Francesco Tornabene:
Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, Bologna, Italy;
(3) Omer Civalek:
Akdeniz University, Engineering Faculty, Civil Engineering Department, Division of Mechanics, 07058 Antalya, Turkey.

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