Vol. 3, No. 10, 2008

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Nonlinear local bending of FGM sandwich plates

Jie Yang, Sritawat Kitipornchai and Kim Meow Liew

Vol. 3 (2008), No. 10, 1977–1992

This paper investigates the nonlinear local bending of a sandwich plate consisting of two composite laminated face sheets and a graded core subjected to a lateral patch load. It is assumed that the material composition of the graded layer varies symmetrically along the thickness direction according to a power law distribution. The present analysis is based on the first order shear deformation plate theory and von Karman nonlinear kinematics, with the interaction between the loaded face sheet and the graded core being modeled as an elastic plate resting on a Vlasov-type elastic foundation. A perturbation technique and Galerkin method are used to determine the nonlinear local bending response. Numerical results show that compared with conventional sandwich plates with a homogeneous soft core, the use of a functionally graded core can effectively reduce both the local deformation and interfacial shear stresses. A parametric study is performed to show the influences of the volume fraction index, Young’s modulus ratio, thickness of the graded core, boundary condition, and load position.

local bending, sandwich struction, functionally graded materials, nonlinear behavior, laminates
Received: 19 May 2007
Revised: 16 November 2007
Accepted: 6 December 2007
Published: 1 December 2008
Jie Yang
School of Aerospace, Mechanical and Manufacturing Engineering
RMIT University
PO Box 71
Bundoora, VIC 3083
Sritawat Kitipornchai
Department of Building and Construction
City University of Hong Kong
Tat Chee Avenue, Kowloon
Hong Kong
Kim Meow Liew
Department of Building and Construction
City University of Hong Kong
Tat Chee Avenue, Kowloon
Hong Kong