Steel and Composite Structures

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Vibration analysis of sandwich truncated conical shells with porous FG face sheets in various thermal surroundings

  • Rahmani, Mohsen (Faculty of Industrial and Mechanical Engineering, Qazvin Branch, Islamic Azad University) ;
  • Mohammadi, Younes (Faculty of Industrial and Mechanical Engineering, Qazvin Branch, Islamic Azad University) ;
  • Kakavand, Farshad (Department of Mechanical Engineering, Takestan Branch, Islamic Azad University)
  • Received : 2019.02.22
  • Accepted : 2019.06.04
  • Published : 2019.07.25
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Abstract

Since conical sandwich shells are important structures in the modern industries, in this paper, for the first time, vibration behavior of the truncated conical sandwich shells which include temperature dependent porous FG face sheets and temperature dependent homogeneous core in various thermal conditions are investigated. A high order theory of sandwich shells which modified by considering the flexibility of the core and nonlinear von Karman strains are utilized. Power law rule which modified by considering the two types of porosity volume fractions are applied to model the functionally graded materials. By utilizing the Hamilton's energy principle, and considering the in-plane and thermal stresses in the face-sheets and the core, the governing equations are obtained. A Galerkin procedure is used to solve the equations in a simply supported boundary condition. Uniform, linear and nonlinear temperature distributions are used to model the effect of the temperature changing in the sandwich shell. To verify the results of this study, they are compared with FEM results obtained by Abaqus software and for special cases with the results in literatures. Eigen frequencies variations are surveyed versus the temperature changing, geometrical effects, porosity, and some others in the numerical examples.

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