Effects of weak nonlinearity on the dispersion relation and frequency band-gaps of a periodic Bernoulli–Euler beam

Vladislav S. Sorokin, Jon Juel Thomsen

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Abstract

The paper deals with analytically predicting the effects of weak nonlinearity on the dispersion relation and frequency band-gaps of a periodic Bernoulli– Euler beam performing bending oscillations. Two cases are considered: (i) large transverse deflections, where nonlinear (true) curvature, nonlinear material and nonlinear inertia owing to longitudinal motions of the beam are taken into account, and (ii) midplane stretching nonlinearity. A novel approach is employed, the method of varying amplitudes. As a result, the isolated as well as combined effects of the considered sources of nonlinearities are revealed. It is shown that nonlinear inertia has the most substantial impact on the dispersion relation of a nonuniform beam by removing all frequency band-gaps. Explanations of the revealed effects are suggested, and validated by experiments and numerical simulation.
Original languageEnglish
Article number20150751
JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume472
Issue number2186
Number of pages22
ISSN1364-5021
DOIs
Publication statusPublished - 2016

Keywords

  • Elastic wave propagation
  • Dispersion relation
  • Frequency band-gaps
  • Weak nonlinearity
  • Periodic Bernoulli–Euler beam
  • Method of varying amplitudes

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