Truss-plate hybrid lattice metamaterials with broadband vibration attenuation and enhanced energy absorption

Based on the principle of local resonance and the strategy of hybrid design, in this paper we propose three truss-plate hybrid multifunctional lattice metamaterials featured by the cubic cell topology with a central truss-plate unit connected by the elastic beams to the eight corners. Finite element (FE) simulations were validated by experimental tests on specimens made of TPU substrate material through SLS additive manufacturing technique. At the relative density of 0.31, the specific energy absorption reaches 2.71 J/g, the bandgap width reaches 2.624 KHz, and the elastic wave transmission attenuation at 1400 Hz frequency reaches – 270 dB. Parametric analyses were carried out to investigate the effects of different geometric parameters on the performance indicators. These results highlight the proposed truss-plate hybrid metamaterial as an intriguing multifunctional material with excellent performances in both energy absorption and vibration attenuation, that can be applied to scenarios with multiple engineering requirements.