Tanuj Gupta, Ankur Dwivedi, Bishakh Bhattacharya
A key challenge in mechanical metamaterials is to optimize the vibration transmissibility through precise structural design. The study addresses the challenge by investigating the vibration characteristics of nine distinct interlaced metastructures fabricated using additive manufacturing. These structures feature complex geometries with interlacing patterns at multiple length scales, where sub-structures are embedded within the primary structure in a defined arrangement. The design focus is on micro-structural configurations that enable application-specific, multifunctional characteristics at the macro level. Interlacing plays a critical role by creating additional scattering paths and local resonances, enabling the formation of wider and multiple bandgaps for vibration attenuation. The research encompasses the design, simulation, and experimental validation of beam-type multiscale interlaced metastructures. Finite element simulations were performed in ANSYS to evaluate their dynamic response and natural frequencies. Experimental validation was conducted using a Laser Doppler Vibrometer (LDV) under controlled excitation to measure the transverse vibration behavior of the proposed design of multiscale interlaced metastructures. This work demonstrates that interlacing type directly influences vibration attenuation frequency ranges, enabling the maximization of attenuation across different frequency bands. Furthermore, this study highlights opportunities for material optimization, establishing interlaced metastructures as promising candidates for advanced vibration control in aerospace and structural applications.