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บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Juntarasaid, C.;Pulngern, T.;Chucheepsakul, S.

ปีที่เผยแพร่ (ค.ศ.): 2014

วารสาร: KMUTT Research and Development Journal (0125-278X)

Volume number: 37

Issue number: 4

หน้าแรก: 481

หน้าสุดท้าย: 502

นอก: 0125-278X

บทคัดย่อ

This paper presents the effects of surface stress and non-local elasticity on the free vibration of nanobeams with various boundary conditions. Analytical solutions for natural frequencies and corresponding mode shapes of the nanobeams are derived and compared numerically by using the finite element method. Identical results between the two solution methods are obtained. The obtained results indicate that the surface stress and non-local elasticity affect directly the free vibration behavior of the nanobeams. The effect of surface stress is to increase the stiffness of the nanobeams. Therefore, the natural frequencies of the nanobeams for all boundary conditions increase in comparison with that of the classical Euler beam. Moreover, the surface stress affects significantly only for the lower modes of vibration. In the case of nonlocal elasticity effect, it reduces the natural frequencies of the nanobeams, especially for the higher modes of vibration. For the nanobeams subjecting to both effects, the results show that the natural frequencies are in between one of the nanobeams with surface stress and the one with non-local elasticity. This gives a practical implication that not only the surface stress but also non-local elasticity affects directly on the vibration behavior of the nanobeams. However, the surface stress affects only the lower modes of vibration and therefore the results of the nanobeams subjecting to both effects are converted to those of the nanobeams where only non-local elasticity is considered for the mode number with higher than fourth mode. In case of vibration mode shapes, the surface stress and non-local elasticity affect the nanobeams of all boundary conditions except the pinned-pinned and sliding-pinned nanobeams.

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