Investigation and application of in-plane mechanical properties of arrow-shaped cylindrical metamaterials

A major challenge in the fields such as civil, mechanical, and aerospace engineering is to obtain materials with lightweight, high stiffness, and vibration reduction properties. This paper proposes a cylindrical metamaterial containing auxetic arrow units. The positive Poisson’s ratio triangular unit is designed by varying the edge length and angle of the auxetic arrow unit, and the reinforced auxetic arrow unit is designed by adding a supporting edge within the auxetic arrow unit. The static stiffness, vibration transmission rate, and impact response of cylindrical metamaterials are analyzed by finite element method (FEM). The results demonstrate that under the same conditions, the metamaterial containing reinforced auxetic arrow unit has better load-bearing and vibration suppression capacities, and the vibration suppression and isolation capacities of the composite structure formed by adding damping materials into the reinforced auxetic arrow unit have been further improved. Subsequently, the effects of unit wall thickness, angle, and number of layers on the physical properties of the reinforced arrow-shaped cylindrical metamaterial are investigated. Finally, the vibration suppression bearing seat (VSBS) is fabricated, which is designed to mount the cylindrical metamaterials produced by additive manufacturing. The experimental results demonstrated that the structure can suppress and isolate the vibration.