Comparison of crash performance of auxetic structures for cf15, pa6/gf30, and gf30pp materials

Abstract

Plate auxetic structures, distinguished by their negative Poisson's ratio, demonstrate unconventional mechanical responses, expanding laterally under tension and contracting under compression. These systems, particularly plate-based designs, are increasingly studied for their exceptional energy absorption, impact resilience, and structural versatility. This research investigates the mechanical behavior of nine auxetic geometries, including reentrant, chiral, antichiral, meta-chiral, arrowhead, star, and a new hybrid auxetic design for three different materials, which are 30 % short glass fiber reinforced polypropylene (GF30PP), polyamide 6 reinforced with 30 % of short glass fiber (PA6/GF30), and high-temperature resistant polyamide with 15 % carbon fiber (CF15) are materials of the auxetic structures used in this paper. Energy absorption performance, maximum forces, and specific energy absorption amount are analyzed to evaluate their suitability for the nine auxetic designs. Findings reveal that Design 9, which is developed in this paper, shows the best energy absorption capacity for PA6/GF30 and CF15 materials.