Structural Engineering and Mechanics

  • 제62권5호
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  • Pages.551-565
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  • 2017
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Strain gradient theory for vibration analysis of embedded CNT-reinforced micro Mindlin cylindrical shells considering agglomeration effects

  • Tohidi, H. (Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University) ;
  • Hosseini-Hashemi, S.H. (Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University) ;
  • Maghsoudpour, A. (Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University) ;
  • Etemadi, S. (Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University)
  • 투고 : 2016.12.27
  • 심사 : 2017.03.30
  • 발행 : 2017.06.10
⟨ 이전 논문 다음 논문 ⟩

초록

Based on the strain gradient theory (SGT), vibration analysis of an embedded micro cylindrical shell reinforced with agglomerated carbon nanotubes (CNTs) is investigated. The elastic medium is simulated by the orthotropic Pasternak foundation. The structure is subjected to magnetic field in the axial direction. For obtaining the equivalent material properties of structure and considering agglomeration effects, the Mori-Tanaka model is applied. The motion equations are derived on the basis of Mindlin cylindrical shell theory, energy method and Hamilton's principal. Differential quadrature method (DQM) is proposed to evaluate the frequency of system for different boundary conditions. The effects of different parameters such as CNTs volume percent, agglomeration of CNTs, elastic medium, magnetic field, boundary conditions, length to radius ratio and small scale parameter are shown on the frequency of the structure. The results indicate that the effect of CNTs agglomeration plays an important role in the frequency of system so that considering agglomeration leads to lower frequency. Furthermore, the frequency of structure increases with enhancing the small scale parameter.

키워드

참고문헌

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