University of Kashan Journal of Nanostructures 2251-7871 4 2 2014 04 01 Vibration of Piezoelectric Nanowires Including Surface Effects 167 176 7782 10.7508/jns.2014.02.006 EN R. Ansari Department of Mechanical Engineering, University of Guilan, P.O. Box 3756, Rasht, Iran M. A. Ashrafi Department of Mechanical Engineering, University of Guilan, P.O. Box 3756, Rasht, Iran S. Hosseinzadeh Department of Mechanical Engineering, University of Guilan, P.O. Box 3756, Rasht, Iran Z. Firouznia Department of Mechanical Engineering, University of Guilan, P.O. Box 3756, Rasht, Iran Journal Article 2015 01 21 In this paper, surface and piezoelectric effects on the vibration behavior of nanowires (NWs) are investigated by using a Timoshenko beam model. The electric field equations and the governing equations of motion for the piezoelectric NWs are derived with the consideration of surface effects. By the exact solution of the governing equations, an expression for the natural frequencies of NWs with simply-supported boundary conditions is obtained. The effects of piezoelectricity and surface effects on the vibrational behavior of Timoshenko NWs are graphically illustrated. A comparison is also made between the predictions of Timoshenko beam model and those of its Euler-Bernoulli counterpart. Additionally, the present results are validated through comparison with the available data in the literature. https://jns.kashanu.ac.ir/article_7782_5d588755f48a758725629598540cae5a.pdf