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Structural Engineering and Mechanics Volume 66, Number 2, April25 2018, pages 237-248 DOI: http://dx.doi.org/10.12989/sem.2018.66.2.237 |
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Wave propagation analysis of smart strain gradient piezo-magneto-elastic nonlocal beams |
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Farzad Ebrahimi and Mohammad Reza Barati
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| Abstract | ||
| This study presents the investigation of wave dispersion characteristics of a magneto-electro-elastic functionally graded (MEE-FG) nanosize beam utilizing nonlocal strain gradient theory (NSGT). In this theory, a material length scale parameter is propounded to show the influence of strain gradient stress field, and likewise, a nonlocal parameter is nominated to emphasize on the importance of elastic stress field effects. The material properties of heterogeneous nanobeam are supposed to vary smoothly through the thickness direction based on power-law form. Applying Hamilton\'s principle, the nonlocal governing equations of MEE-FG nanobeam are derived. Furthermore, to derive the wave frequency, phase velocity and escape frequency of MEE-FG nanobeam, an analytical solution is employed. The validation procedure is performed by comparing the results of present model with results exhibited by previous papers. Results are rendered in the framework of an exact parametric study by changing various parameters such as wave number, nonlocal parameter, length scale parameter, gradient index, magnetic potential and electric voltage to show their influence on the wave frequency, phase velocity and escape frequency of MEE-FG nanobeams. | ||
| Key Words | ||
| wave propagation; functionally graded nanobeam; magneto-electro-elastic materials; nonlocal strain gradient theory | ||
| Address | ||
| Farzad Ebrahimi and Mohammad Reza Barati: Department of Mechanical Engineering, Faculty of Engineering, Imam Khomeini International University, P.O.B. 16818-34149, Qazvin, Iran | ||