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Vibration analysis of a rotating functionally graded tapered microbeam based on the modified couple stress theory by DQEM

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Abstract

Due to having difficulty in solving governing nonlinear differential equations of a non-uniform microbeam, a few numbers of authors have studied such fields. In the present study, for the first time, the size-dependent vibration behavior of a rotating functionally graded (FG) tapered microbeam based on the modified couple stress theory is investigated using differential quadrature element method (DQEM). It is assumed that physical and mechanical properties of the FG microbeam are varying along the thickness that will be defined as a power law equation. The governing equations are determined using Hamilton’s principle, and DQEM is presented to obtain the results for cantilever and propped cantilever boundary conditions. The accuracy and validity of the results are shown in several numerical examples. In order to display the influence of size on the first two natural frequencies and consequently changing of some important microbeam parameters such as material length scale, rate of cross section, angular velocity and gradient index of the FG material, several diagrams and tables are represented. The results of this article can be used in designing and optimizing elastic and rotary-type micro-electro-mechanical systems like micro-motors and micro-robots including rotating parts.

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Authors and Affiliations

  1. Department of Mechanics, Faculty of Engineering, Imam Khomeini International University, Qazvin, 3414916818, Iran

    Majid Ghadiri, Navvab Shafiei & S. Alireza Mousavi

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  1. Majid Ghadiri
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  2. Navvab Shafiei
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  3. S. Alireza Mousavi
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Correspondence to Majid Ghadiri.

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Ghadiri, M., Shafiei, N. & Alireza Mousavi, S. Vibration analysis of a rotating functionally graded tapered microbeam based on the modified couple stress theory by DQEM. Appl. Phys. A 122, 837 (2016). https://doi.org/10.1007/s00339-016-0364-5

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