Crushing behaviour of corrugated tilted honeycomb core inspired by plant stem

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• peak crushing force (PCF), mean crushing force (MCF), crushing force efficiency (CFE), and the specific energ

• As illustrated in Fig. 3(b), the proposed CTH core can be easily fabricated using the slotting technique, which is widely used for the fabrication of conventional square honeycomb [48]. During the fabrication of each corrugated plate of CTH core shown in Fig. 3(a), rectangular plate of the same width (w) and length (l) can be slotted and corrugated at the desired location. Then, those corrugated plates are assembled at the interconnections by brazing or bonding to ensure good bonding.

• These corrugated tilted plates also leave the top gaps (corrugated gaps) of the same dimension as the cutting portions as circled in Fig. 3(e).

• ncreases the buckling resistance of the sidewalls and results in an enhancement of plateau crushing resistance as well as increases the plastic deformation of the folded corrugated sidewalls.

• Truncated pyramid kirigami foldcores with various pyramid shapes have been proposed, and ideal energy absorption performance has been illustrated such as a low initial peak, a high mean-to-peak crushing force ratio (CFE), and a high SEA as compared with a cube strip or Miura-origami foldcore of similar relative density [16], [17]. This ideal performance is achieved due to the inward bending of the top edges and the easy folding of the individual tapered unit cell of the truncated pyramid foldcores.

• The proposed CTH core has higher SEA and CFE than most of the existing structural forms of cores with similar relative density.

• Dynamic compressive properties of reinforced and kirigami modified honeycomb in three axial directions