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Effect of Pasternak foundation: Structural modal identification for vibration of FG shell

  • Hussain, Muzamal (Department of Mathematics, Govt. College University Faisalabad) ;
  • Selmi, Abdellatif (Department of Civil Engineering, College of Engineering in Al-Kharj, Prince Sattam bin Abdulaziz University)
  • Received : 2020.04.07
  • Accepted : 2020.05.29
  • Published : 2020.06.25
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Abstract

Employment of the wave propagation approach with the combination of Pasternak foundation equation gives birth to the shell frequency equation. Mathematically, the integral form of the Lagrange energy functional is converted into a set of three partial differential equations. A cylindrical shell is placed on the elastic foundation of Pasternak. For isotropic materials, the physical properties are same everywhere, whereas the laminated and functionally graded materials, they vary from point to point. Here the shell material has been taken as functionally graded material. The influence of the elastic foundation, wave number, length and height-to-radius ratios is investigated with different boundary conditions. The frequencies of length-to-radius and height-to-radius ratio are counter part of each other. The frequency first increases and gain maximum value in the midway of the shell length and then lowers down for the variations of wave number. It is found that due to inducting the elastic foundation of Pasternak, the frequencies increases. It is also exhibited that the effect of frequencies is investigated by varying the surfaces with stainless steel and nickel as a constituent material. MATLAB software is utilized for the vibration of functionally graded cylindrical shell with elastic foundation of Pasternak and the results are verified with the open literature.

Keywords

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