Three-dimensional meta-truss lattice composite structures with vibration isolation performance

Abstract

A challenge for developing vibration absorption properties of lattice structures is considering the generation of low-frequency bandgaps and load bearing capacity simultaneously. In order to implement the design and production of materials with structural and functional performances, this paper presents a three dimensional (3D) acoustic metamaterial based stretching-dominated meta-truss lattice structure fabricated by selective laser sintering (SLS)-based 3D-printing technology consisting of beams. In particular, the cross-sections of diagonal beams inside the body-centered cubic lattice are variable. The bandgaps induced by local resonances and waveform transformations are obtained by calculating the band structure of the proposed lattice structure using finite-element (FE) simulations and the results are verified by conducting experiments about vibration transmission. To enhance the bearing capacity of the lattice structure, changing of bandgaps by increasing the cross-section of the outer frame of each unit-cell is investigated. The stretching-dominated meta-truss lattice structures provide new possibilities for the design of vibration isolation system with requirements of load-bearing capacity.