Abstract

• A multifunctional metamaterial that possesses both vibration mitigation and energy absorption properties was proposed. • Low-frequency local resonance bandgap was achieved in the designed lightweight lattice structure. • The implementation of the functionally graded strategy enhanced the multifunctional performance of vibration mitigation and energy absorption. Complex engineering applications have created an increasing demand for engineering structures or materials with multiple desired properties. In this context, metamaterials endowed with multifunctionalities through their structural configuration show unique advantages over traditional materials. Here, we present a novel three-dimensional lattice structure with simultaneous vibration mitigation and energy absorption capabilities. The results of numerical simulations and experimental tests demonstrate that the proposed metastructure is capable of attenuating low-frequency elastic waves through local resonance and absorbing impact energy through buckling deformation. Importantly, the local resonance is achieved by introducing the lightweight struts rather than additional heavy masses. Moreover, a functionally graded strategy is implemented to further enhance the vibration mitigation and energy absorption performance of the lattice metamaterial. The findings obtained in this study suggest a promising pathway for the development of multifunctional metamaterials for various specific applications.