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论文类型：期刊论文

发表时间：2017-10-01

发表刊物：ACTA MECHANICA SINICA

收录刊物：Scopus、SCIE、EI

卷号：33

期号：5

页面范围：912-925

ISSN号：0567-7718

关键字：Hamiltonian system; Analytical method; Nonlocal elasticity theory; Orthotropic graphene sheet; Natural frequency

摘要：A nonlocal continuum orthotropic plate model is proposed to study the vibration behavior of single-layer graphene sheets (SLGSs) using an analytical symplectic approach. A Hamiltonian system is established by introducing a total unknown vector consisting of the displacement amplitude, rotation angle, shear force, and bending moment. The high-order governing differential equation of the vibration of SLGSs is transformed into a set of ordinary differential equations in symplectic space. Exact solutions for free vibration are obtianed by the method of separation of variables without any trial shape functions and can be expanded in series of symplectic eigenfunctions. Analytical frequency equations are derived for all six possible boundary conditions. Vibration modes are expressed in terms of the symplectic eigenfunctions. In the numerical examples, comparison is presented to verify the accuracy of the proposed method. Comprehensive numerical examples for graphene sheets with Levy-type boundary conditions are given. A parametric study of the natural frequency is also included.