doi: 10.3850/S201042862015001143

Buckling of Hierarchical Sandwich Panels with Lattice Cores

Bing Du, Chenzhe Ouyang, Jian Zhang and Liming Chen School of Aerospace Engineering, Chongqing University, Chongqing 400030, PR China clm07@cqu.edu.cn

ABSTRACT

Buckling of hierarchical sandwich panels with corrugation and square honeycomb cores subjected to edgewise uniformly-distributed load is numerically investigated. Buckling modes of hierarchical sandwich panels: (i) local buckling and (ii) global buckling are observed and compared. Critical buckling stress (CBS) is calculated based on Finite Element Method (FEM) results, and the influence of hierarchy, core configuration and geometrical parameters such as core relative density and panel thickness on CBS is also discussed. It is found that increasing relative density can enhance the CBS of sandwich panels and this improvement becomes dramatical when the structures are only first order or with relatively thicker facesheets. It is also revealed that second order square honeycomb sandwich panels have significantly higher CBS than their first order counterparts with equivalent mass, but for corrugation sandwich panels, hierarchy can only improve CBS when relative densities are less than about 5%.

Keywords: Hierarchical, Lattice sandwich panel, Critical buckling stress.

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