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Stability of nonlinear periodic vibrations of 3D beams

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Abstract

The geometrically nonlinear periodic vibrations of beams with rectangular cross section under harmonic forces are investigated using a p-version finite element method. The beams vibrate in space; hence they experience longitudinal, torsional, and nonplanar bending deformations. The model is based on Timoshenko’s theory for bending and assumes that, under torsion, the cross section rotates as a rigid body and is free to warp in the longitudinal direction, as in Saint-Venant’s theory. The theory employed is valid for moderate rotations and displacements, and physical phenomena like internal resonances and change of the stability of the solutions can be investigated. Green’s nonlinear strain tensor and Hooke’s law are considered and isotropic and elastic beams are investigated. The equation of motion is derived by the principle of virtual work. The differential equations of motion are converted into a nonlinear algebraic form employing the harmonic balance method, and then solved by the arc-length continuation method. The variation of the amplitude of vibration in space with the excitation frequency of vibration is determined and presented in the form of response curves. The stability of the solution is investigated by Floquet’s theory.

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Authors and Affiliations

  1. DEMec/IDMEC, Faculdade de Engenharia, Universidade do Porto, R. Dr. Roberto Frias, s/n, 4200-465, Porto, Portugal

    S. Stoykov & P. Ribeiro

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  1. S. Stoykov
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  2. P. Ribeiro
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Correspondence to S. Stoykov.

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Stoykov, S., Ribeiro, P. Stability of nonlinear periodic vibrations of 3D beams. Nonlinear Dyn 66, 335–353 (2011). https://doi.org/10.1007/s11071-011-0150-z

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