Structural Engineering and Mechanics

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Finite element analysis of functionally graded sandwich plates under nonlinear sense for aerospace applications

  • GulshanTaj, M.N.A. (Department of Civil Engineering, Sona College of Technology) ;
  • Chakrabarti, Anupam (Department of Civil Engineering, Indian Institute of Technology Roorkee) ;
  • Malathy, R. (Department of Civil Engineering, Sona College of Technology) ;
  • Kumar, S.R.R. Senthil (Department of Civil Engineering, Sona College of Technology)
  • Received : 2020.04.15
  • Accepted : 2021.08.02
  • Published : 2021.11.10
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Abstract

Owing to the increase in demand for composite materials for different applications in aircraft structures, the nonlinear response of functionally graded ceramic-metal sandwich plates under mechanical loading is studied in the present research work. Geometric nonlinearity (GNL) is considered by Green-strain components and further assumes the form of von Kármán strains. It is ascertained that the effective mechanical properties vary through the thickness direction as a function of volume fraction of ceramic and metal constituents and obeys power law equation. Higher order displacement model proposed by Reddy is incorporated in the study to arrive for 2D isoparametric finite element C0 formulation. A nine node Lagrangian element is accomplished to model the assumed plate geometry. Different thickness schemes are proposed to model the sandwich plate with graded layer as core/ face sheets. Although the model can handle thickness scheme of any kind, results are exposed for four types of symmetric sandwich plates. Comparison statement between isotropic and graded plates is drawn in each case by appropriate selection of power law exponent value. The present investigation may be useful for design engineers/researchers to arrive for particular thickness scheme based on the results, while performing large deformation analysis of functionally graded sandwich plates (FGSP).

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