Abstract
The development of the current technology has increased the requirement for the versatility of acoustic metamaterials. In this study, the band gap (BG) tuning of the stretch-dominated thermal expansion lattice metamaterials with different configurations composed of triangular units is studied using the finite element method, and a design method for metamaterials tuned by external temperature changes in multiple frequency ranges is proposed. The results indicate that the stretch-dominated thermal expansion material can maintain the original customized thermal expansion performance while possessing the characteristics of the BG in addition to realizing different degrees of BG tunability when the temperature changes. The results provide a theoretical basis for attaining the thermal expansion/tunable BG dual-objectives design. The objective is to achieve the dual goals of tailorable coefficient of thermal expansion and tunable BG design through reasonable material selection and shape optimization.
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