Graded conventional-auxetic Kirigami sandwich structures: Flatwise compression and edgewise loading

Yangqing Hou, Robin M Neville, Fabrizio Scarpa*, Chrystel D L Remillat, B. Gu, Massimo Ruzzene

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

186 Citations (Scopus)


The work describes the manufacturing and testing of graded conventional/auxetic honeycomb cores. The graded honeycombs are manufactured using Kevlar woven fabric/914epoxy prepreg using Kirigami techniques, which consist in a combination of Origami and ply-cut processes. The cores are used to manufacture sandwich panels for flatwise compression and edgewise loading. The compressive modulus and compressive strength of stabilized (sandwich) honeycombs are found to be higher than those of bare honeycombs, and with density-averaged properties enhanced compared to other sandwich panels offered in the market place. The modulus and strength of graded sandwich panel under quasi-static edgewise loading vary with different failure mode mechanisms, and offer also improvements towards available panels from open literature. Edgewise impact loading shows a strong directionality of the mechanical response. When the indenter impacts the auxetic portion of the graded core, the strong localization of the damage due to the negative Poisson’s ratio effect contains significantly the maximum dynamic displacement of the sandwich panel.
Original languageEnglish
Pages (from-to)33-42
Number of pages10
JournalComposites Part B: Engineering
Early online date8 Nov 2013
Publication statusPublished - 1 Mar 2014


  • Honeycomb
  • Mechanical properties
  • Impact behavior
  • Assembly


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