Controlling band gaps with geometry in composite elastic meta-structures

Abstract eng:
Architected materials can obtain enhanced elastic wave propagation properties not found in natural materials, such as low frequency or broadband vibration and sound absorption. Recent research has shown that composite elastic meta-structures present a way of simultaneously obtaining wide band gaps at low frequencies, by using resonating elements to broaden and lower Bragg gaps. These meta-structures combine embedded particles and an architected lattice, and are fabricated with novel 3D printing techniques. We demonstrate how tuning the lattice geometry of these meta-structures can control locally resonant modes of the embedded particles to achieve wider band gaps at lower frequencies, while keeping the total mass constant.

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