Derivation of nonlocal FEM formulation for thermo-elastic Timoshenko beams on elastic matrix

Numanoglu H. M., Ersoy H., Civalek O., Ferreira A. J. M.

COMPOSITE STRUCTURES, cilt.273, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 273
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.compstruct.2021.114292
  • Dergi Adı: COMPOSITE STRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Nanobeam, Nonlocal elasticity, Thermal environment, Timoshenko beam, Vibration, Weighted Residual, Winkler-Pasternak foundation, FREE-VIBRATION ANALYSIS, WALLED CARBON NANOTUBES, LONGITUDINAL VIBRATION, STATIC ANALYSIS, NONLINEAR VIBRATION, BOUNDARY-CONDITIONS, NANOBEAMS, CONTINUUM, STRAIN, MICROTUBULES
  • Akdeniz Üniversitesi Adresli: Evet

Özet

Free thermal vibration analysis of nanobeams surrounded by an elastic matrix is examined via nonlocal elasticity and Timoshenko beam theories in this article. Elastic matrix is formulated with a two-parameter elastic foundation modelled by combining Winkler and Pasternak assumptions. The equation of motion for free vibration is reached via Hamilton's principle and solved by analytical method (separation of variable). However, since the separation of variable cannot be applied for boundary conditions other than simply supported nano beams, a weighted residue-based finite element formulation is developed. Within the scope of numerical results, firstly, it is understood from the comparisons given for nondimensional frequencies that the nonlocal finite element formulation has a high accuracy and then, using this formulation, nondimensional frequencies of nanobeams with different boundary conditions are computed under different parameters. Additionally, the detailed discussions of the numerical results are presented. Finally, by giving some general results, the effect of size dependency and environmental factors on the dynamic behavior of nanobeams is expressed.