Dual-functional acoustic-mechanical metamaterial with engineered tetrahedral microlattice

Noise pollution poses a severe threat to human health and industrial systems, particularly in extreme environments such as aerospace cabins, deep-sea equipment, or defense installations, necessitating advanced sound absorption solutions that simultaneously satisfy efficient sound-absorbing performance and mechanical robustness. This study proposed a dual-functional metamaterial with improved acoustic and mechanical properties, which were achieved by integrating effective acoustic analysis tools with a modified tetrahedral structure. Specimens fabricated via stereolithography demonstrated quasi-perfect absorption (α ' 0.999) at absorption peaks, with ∼ 3750 Hz half-absorption bandwidths that covered 75% of the tested spectrum (1000–6000 Hz). The mechanically reinforced configuration exhibited enhanced performance, with compressive strength and Young’s modulus surpassing conventional TPMS-Gyroid lattices by 53% and 68% respectively. Finite element analysis revealed the dissipation of the viscous boundary layer as the predominant sound absorption mechanism, which covered ' 99% of the total acoustic energy dissipation. This work establishes a paradigm for engineering applications demanding the synergistic integration of noise control and damage resistance under extreme operational conditions.