Techno Press

Steel and Composite Structures   Volume 28, Number 1, July10 2018, pages 99-110
A size-dependent quasi-3D model for wave dispersion analysis of FG nanoplates
Behrouz Karami, Maziar Janghorban, Davood Shahsavari and Abdelouahed Tounsi

Abstract     [Full Text]
    In this paper, a new size-dependent quasi-3D plate theory is presented for wave dispersion analysis of functionally graded nanoplates while resting on an elastic foundation and under the hygrothermaal environment. This quasi-3D plate theory considers both thickness stretching influences and shear deformation with the variations of displacements in the thickness direction as a parabolic function. Moreover, the stress-free boundary conditions on both sides of the plate are satisfied without using a shear correction factor. This theory includes five independent unknowns with results in only five governing equations. Size effects are obtained via a higher-order nonlocal strain gradient theory of elasticity. A variational approach is adopted to owning the governing equations employing Hamilton\'s principle. Solving analytically via Fourier series, these equations gives wave frequencies and phase velocities as a function of wave numbers. The validity of the present results is examined by comparing them with those of the known data in the literature. Parametric studies are conducted for material composition, size dependency, two parametric elastic foundation, temperature and moisture differences, and wave number. Some conclusions are drawn from the parametric studies with respect to the wave characteristics.
Key Words
    functionally graded materials; wave propagation; quasi-3D plate theory; higher-order nonlocal strain gradient elasticity theory; hygrothermal environment
(1) Behrouz Karami, Maziar Janghorban, Davood Shahsavari:
Department of Mechanical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran;
(2) Abdelouahed Tounsi:
Material and Hydrology Laboratory, University of Sidi Bel Abbes, Faculty of Technology, Civil Engineering Department, Algeria.

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