Static response of synclastic sandwich panel with auxetic wood-based honeycomb cores subject to compression

Only a few research works show a method for creating doubly curved surfaces using single-layer auxetic structures. There are no studies regarding sandwich wood-based synclastic panels with the auxetic core. The main goal of this work was to determine the effect of the thin facings on the stiffness, strength, amount of absorbed energy, and damage of the synclastic panels with an auxetic core subjected to static compression. The facings of sandwich panels were manufactured out of cardboard and a copolyester of polyethylene terephthalate glycol (PETG). WoodEpox (R) composite was used as a material of the core structure. Synclastic panels were tested experimentally and analyzed using the finite element method. In addition, the damage process of the core and facings was described. The results of studies have shown a significant impact of the facing type of sandwich panel on its overall stiffness and ability to absorb energy. Cardboard panels are significantly more rigid than those made of PETG. Also, cardboard panels show a high ability to absorb energy.

Automated summary

This study aims to investigate the effect of thin facings on the stiffness, strength, energy absorption, and damage of synclastic panels with an auxetic core. The results show that the facing type significantly influences the overall stiffness and energy absorption ability of the sandwich panel, with cardboard facings being more rigid and better at absorbing energy than PETG facings.