Exact modes for post-buckling characteristics of nonlocal nanobeams in a longitudinal magnetic field. (English) Zbl 1480.74081
Summary: An exact mode solution that investigates the prebuckling and postbuckling characteristics of nonlocal nanobeams with fixed-fixed, hinged-hinged, and fixed-hinged boundary conditions in a longitudinal magnetic field is determined. The geometric nonlinearity arising from mid-plane stretching is considered to obtain the nonlinear governing equation of motion by virtue of Hamilton’s principle. The influences of the nonlocal and magnetic parameters on the prebuckling and postbuckling dynamics of nanobeams with various boundary conditions are evaluated, indicating that the critical buckling force can be decreased with the increase of the nonlocal parameter while can be increased with increasing the magnetic parameter. It is demonstrated that the first natural frequency of the nanobeam with fixed-fixed and fixed-hinged conditions in postbuckling configuration is increased from zero to a constant value for higher values of the nonlocal parameter with increasing the axial force. The second natural frequency of the buckled nanobeam is always decreased with an increase of the nonlocal parameter. The results show that the internal resonance between the first and second modes of the postbuckling nanobeams can be quickly and easily activated by increasing the nonlocal parameters, especially for fixed-fixed and hinged-hinged boundary conditions. In addition, the results obtained by exact mode solution are compared those obtained by classical mode solution. It is found that the classical mode is valid only for nonlocal nanobeams with the hinged-hinged boundary conditions.
Keywords:
nonlocal nanobeam; postbuckling; exact mode solution; boundary conditions; longitudinal magnetic field; internal resonanceReferences:
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