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Advances in Nano Research Volume 7, Number 6, November 2019 , pages 379-390 DOI: https://doi.org/10.12989/anr.2019.7.6.379 |
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A novel porosity-based homogenization scheme for propagation of waves in axially-excited FG nanobeams |
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Farzad Ebrahimi and Ali Dabbagh
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| Abstract | ||
| Putting emphasis on the effect of existence of porosity in the functionally graded materials (FGMs) on the dynamic responses of waves scattered in FG nanobeams resulted in implementation of a novel porosity-based homogenization method for FGMs and show its applicability in a wave propagation problem in the presence of axial pre-load for the first time. In the employed porosity-dependent method, the coupling between density and Young's moduli is included to consider for the effective moduli of the FG nanobeam by the means of a more reliable homogenization technique. The beam-type element will be modeled via the classical theory of beams, namely Euler-Bernoulli beam theory. Also, the dynamic form of the principle of virtual work will be extended for such nanobeams to derive the motion equations. Applying the nonlocal constitutive equations of Eringen on the obtained motion equations will be resulted in derivation of the nanobeam's governing equations. Depicted results reveal that the dispersion responses of FG nanobeams will be decreased as the porosity volume fraction is increased which must be noticed by the designers of advanced nanosize devices who are interested in employment of wave dispersion approach in continuous systems for specific goals. | ||
| Key Words | ||
| wave propagation; porous materials; functionally graded materials (FGMs); nonlocal elasticity theory | ||
| Address | ||
| (1) Farzad Ebrahimi: Department of Mechanical Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran; (2) Ali Dabbagh: School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran. | ||