A size-dependent quasi-3D model for wave dispersion analysis of FG nanoplates

作者：Karami, Behrouz^*; Janghorban, Maziar; Shahsavari, Davood; Tounsi, Abdelouahed

来源：Steel and Composite Structures, 2018, 28(1): 99-110.

DOI：10.12989/scs.2018.28.1.099

• functionally graded materials
• wave propagation
• quasi-3D plate theory
• higher-order nonlocal strain gradient elasticity theory
• hygrothermal environment

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.

• 出版日期2018-7-10