A homogenization method for geometric nonlinear analysis of sandwich structures with initial imperfections

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Abstract

A homogenization method for geometric nonlinear analysis of structural core sandwich panels is proposed. The method provides high computational performance based on an efficient separation of scales. In the macroscale, the sandwich panel is discretized with an equivalent single layer of shell elements. The macroscale shell stiffness matrix is nonlinear, obtained from the analysis of a representative volume element. Prescribed displacement boundary conditions are applied to the representative unit based on the strain definitions of the first-order shear deformation theory. Changes in local wavelength in the post buckling are considered in the analyses. Manufacturing-induced imperfections are introduced to local and global scales. The method allows for description of buckling in these two scales and is shown to hold good accuracy with respect to equivalent 3D FEM models. Examples include web-core and corrugated core sandwich panels. The method can be extended to any periodic structure of complex local topology. It can be easily implemented to commercial FE packages. (C) 2016 Elsevier Ltd. All rights reserved.

Details

Original languageEnglish
Pages (from-to)194-205
Number of pages12
JournalInternational Journal of Solids and Structures
Volume87
Publication statusPublished - 1 Jun 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • Sandwich structure, Multiscale modelling, Homogenization, Buckling, Post-buckling, Geometric nonlinearity, TRANSVERSE-SHEAR STIFFNESS, COMPUTATIONAL HOMOGENIZATION, STIFFENED PANELS, BENDING RESPONSE, CORE, PLATES

ID: 4431561