Additively manufactured metallic three-period minimal surface structure and micro-perforated plate acoustic-mechanical structure

Lattice structures, known for lightweight, high specific mechanical properties, high design freedom, and exhibit broad application prospects in fields such as load-bearing, impact protection, sound absorption, and noise reduction. This study proposes a novel metallic three-period minimal surface structure and micro-perforated plate composite acoustic-mechanical multifunctional structure and fabricates experimental specimens using additive manufacturing technology. Finite element and impedance tube experiments were conducted based on an acoustic-vibration theoretical model. The results indicate when the structural parameters of the micro-perforated plate remained unchanged, the sound absorption of the three-period minimal surface structure and micro-perforated plate was regulated by the density of the three-period minimal surface structure. The underlying mechanism involves adjusting the sound absorption frequency by controlling the cavity depth of the perforated panel. Furthermore, the mechanical properties of the three-period minimal surface structure were investigated using quasi-static compression experiments. The study found that the three-period minimal surfaces with different porosities have different slope platform stresses, and the specific energy absorption with small slope (low porosity) is higher. Compared to other load-bearing structures, the Gyroid structure in this study demonstrated optimal mechanical performance. This work provides a new paradigm for designing acoustic-mechanical functional structures.