Buckling and progressive crushing of laterally loaded honeycomb

A. Wilbert, Wen-Yea Jang, S. Kyriakides*, J. F. Floccari

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

85 Scopus citations

Abstract

This paper presents a comprehensive study of the lateral compressive response of hexagonal honeycomb panels from the initial elastic regime to a fully crushed state. Expanded aluminum alloy honeycomb panels with a cell size of 9.53 mm, a relative density of 0.026, and a height of 15.9 mm are laterally compressed quasi statically between rigid platens under displacement control. The cells buckle elastically and collapse at a higher stress due to inelastic action. Deformation then first localizes at mid-height and the cells crush by progressive formation of folds; associated with each fold family is a stress undulation. The response densifies when the whole panel height is consumed by folds. The buckling and crushing events are simulated numerically using finite element models involving periodic domains of a single or several characteristic cells. The models idealize the microstructure as hexagonal, with double walls in one direction. The nonlinear behavior is initiated by elastic buckling while inelastic collapse that leads to the localization observed in the experiments occurs at a significantly higher load. The collapse stress is found to be mildly sensitive to various problem imperfections. The subsequent folding can be reproduced numerically using periodic domains but requires a fine mesh capable of capturing the complexity of the folds. The calculated crushing response is shown to better resemble measured ones when a 4 × 4 cell domain is used. However, the average crushing stress can be captured with engineering accuracy even from a single cell domain.

Original languageEnglish
Pages (from-to)803-816
Number of pages14
JournalInternational Journal of Solids and Structures
Volume48
Issue number5
DOIs
StatePublished - 1 Mar 2011

Keywords

  • Buckling
  • Collapse
  • Crushing
  • Honeycomb

Fingerprint Dive into the research topics of 'Buckling and progressive crushing of laterally loaded honeycomb'. Together they form a unique fingerprint.

Cite this