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Steel and Composite Structures
  Volume 32, Number 5, September10 2019 , pages 633-642

Buckling behavior of functionally graded porous plates integrated with laminated composite faces sheets
Kuo Xu, Yuan Yuan and Mingyang Li

    In this work, lightweight sandwich plates consisting of a functionally graded porous (FGP) core and two laminated composite face sheets resting on elastic foundation have been proposed. Three different profiles are considered for the distributions of porosities along core thickness. The main aim of this paper is the investigation of the buckling behavior of the proposed porous sandwich plates (PSPs) by reporting their critical mechanical loads and their corresponding mode shapes. A finite element method (FEM) based on first order shear deformation theories (FSDT) is developed to discretize governing equations for the buckling behavior of the proposed sandwich plates. The effects of porosity dispersion and volume, the numbers and angles of laminated layers, sandwich plate geometrical dimensions, elastic foundation coefficients, loading and boundary conditions are studied. The results show that the use of FGP core can offer a PSP with half weight core and only 5% reduction in critical buckling loads. Moreover, stacking sequences with only ±45 orientation fibers offer the highest values of buckling loads.
Key Words
    sandwich plates; functionally graded porous core; laminated composites; buckling behaviors; FEM
School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an, 710048, China.

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