High load-bearing and low-frequency multi-broadband design of innovative composite meta-material.

[Display omitted] • The innovative metamaterials with high load-bearing capacity and low-frequency multi-bandgaps are proposed and optimized based on assembly concept. • The incorporation of metal pins enhances the local stiffness, thereby improving the load-bearing ability of the metamaterial. • The metal pins play a crucial role in generating low-frequency multi-bandgaps by adjusting the local resonant modes. • The structure of particle damping can conveniently adjust the frequency of the resonant bandgaps and further dissipate the vibration energy. This study presents a novel star-shaped honeycomb meta-material (N-SSHM) that realizes improved static mechanical and vibration properties by introducing rings to the four sides of a traditional star-shaped honeycomb meta-material (T-SSHM). Optimization of the static and vibration suppression properties is achieved using the assembly concept. The static properties of the proposed meta-materials are initially investigated using the finite element method (FEM) and static compression tests. The results demonstrate that the N-SSHM exhibits a superior load-bearing capacity compared to the T-SSHM. Subsequently, the vibration properties of the meta-material are studied using simulations and experiments. The wave propagation characteristics of the meta-materials are explored by introducing the phase velocity and group velocity. The study also examines the effects of design parameters (ring size, metal pin size, and pin material) on the bandgap characteristics, and the vibration suppression properties of the meta-material are further enhanced by introducing particle damping. The simulation and experimental results confirm that the proposed N-SSHM has a lower starting frequency and wider bandwidth for the bandgap than the T-SSHM. In summary, the N-SSHM demonstrates significant improvements in both load-bearing and vibration suppression compared to the T-SSHM. This study provides support for the engineering applications of meta-materials. [ABSTRACT FROM AUTHOR]