Prediction of failure modes and peak loads in lattice sandwich panels under three-point loading

Ayumi Omachi, Kuniharu Ushijima, Dai Heng Chen, Wesley J. Cantwell

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

In this study, the failure behaviour of lattice sandwich panels under three-point loading has been studied using a nonlinear finite element analysis. The failure mechanisms of lattice-cored sandwich panels can be classified in three modes; facesheet yielding, facesheet wrinkling and core shear. When the panel fails due to facesheet yielding or core shear, the evaluation of the strength of the lattice-cored panel can be undertaken in the same manner as that of a foam-cored panel. In contrast, when wrinkle-like deformation occurs in the facesheets, the failure load can be estimated from the buckling stress of the facesheet. The failure mode map for the lattice-cored panel with the coordinate system tf /l and ρc *s can be described by the analytical equations that predict the three failure modes. The failure mode map highlights the dominant failure modes for the lattice-cored sandwich panel based on the key design parameters tf /l and ρc *s.

Original languageBritish English
Pages (from-to)1635-1659
Number of pages25
JournalJournal of Sandwich Structures and Materials
Volume22
Issue number5
DOIs
StatePublished - 1 Jun 2020

Keywords

  • failure load
  • finite element method
  • lattice-cored panel
  • Sandwich panel

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