Design and mechanical properties of 3D-printed auxetic honeycomb structure. (September 2020)

• Record Type: Journal Article
• Authors: Lvov, V.A.; Senatov, F.S.; Korsunsky, A.M.; Salimon, A.I.
• Is Part Of: Materials today communications. Volume 24(2020)
• Publication Date: 2020-09
• Subjects: Auxetics -- Cycle loading -- Deformation and fracture -- Simulation and modeling; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2020.101173
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: Highlights: Auxetic and non-auxetic structures were tested under low cycle compression. Optimal values found for inter-strut inclination angles for re-entrant auxetic structure. Material mechanical properties were found to affect the apparent Poisson's ratio. Auxetic structures show good energy absorption and can be used as "dampers". Abstract: The combination of theoretical calculations, computer simulations, and experimental evaluation of Poisson's ratio was carried out for re-entrant honeycomb auxetic structure. Optimal honeycomb cell parameters were determined for 3D-printed samples made from thermoplastic polyurethane (TPU). The low-cycle compression tests of 3D-printed re-entrant honeycomb auxetic samples showed that the structure based on auxetic hexagonal cell can withstand almost 1.75 times more very low cycle fatigue cycles than the similar non-auxetic structure. Neither failure nor layer delamination in 3D structures were detected in the auxetic sample after 500 compression cycles. 3D-printed auxetic structures offer a promising candidate for applications in medicine and sports.