Structural Engineering and Mechanics

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Mechanical analysis of cutout piezoelectric nonlocal nanobeam including surface energy effects

  • Eltaher, Mohamed A. (Mechanical Engineering Dept., Faculty of Engineering, King Abdulaziz University) ;
  • Omar, Fatema-Alzahraa (Mechanical Design and Production Dept., Faculty of Engineering, Zagazig University) ;
  • Abdalla, Waleed S. (Mechanical Design and Production Dept., Faculty of Engineering, Zagazig University) ;
  • Kabeel, Abdallah M. (Mechanical Design and Production Dept., Faculty of Engineering, Zagazig University) ;
  • Alshorbagy, Amal E. (Mechanical Design and Production Dept., Faculty of Engineering, Zagazig University)
  • Received : 2018.02.21
  • Accepted : 2020.05.29
  • Published : 2020.10.10
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Abstract

This manuscript tends to investigate influences of nanoscale and surface energy on a static bending and free vibration of piezoelectric perforated nanobeam structural element, for the first time. Nonlocal differential elasticity theory of Eringen is manipulated to depict the long-range atoms interactions, by imposing length scale parameter. Surface energy dominated in nanoscale structure, is included in the proposed model by using Gurtin-Murdoch model. The coupling effect between nonlocal elasticity and surface energy is included in the proposed model. Constitutive and governing equations of nonlocal-surface perforated Euler-Bernoulli nanobeam are derived by Hamilton's principle. The distribution of electric potential for the piezoelectric nanobeam model is assumed to vary as a combination of a cosine and linear variation, which satisfies the Maxwell's equation. The proposed model is solved numerically by using the finite-element method (FEM). The present model is validated by comparing the obtained results with previously published works. The detailed parametric study is presented to examine effects of the number of holes, perforation size, nonlocal parameter, surface energy, boundary conditions, and external electric voltage on the electro-mechanical behaviors of piezoelectric perforated nanobeams. It is found that the effect of surface stresses becomes more significant as the thickness decreases in the range of nanometers. The effect of number of holes becomes significant in the region 0.2 ≤ α ≤ 0.8. The current model can be used in design of perforated nano-electro-mechanical systems (PNEMS).

Keywords

Acknowledgement

This work was supported by the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah, under Grant no. (DF-523-135-1441). The authors, therefore, gratefully acknowledge the DSR technical and financial support.

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