3D syndiotactic elastic metastructure with single-phase material |
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| Affiliation: | 1. School of Mechanical Engineering and State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi''an Jiaotong University, Xi''an 710049, China;2. Institute of Acoustics, Tongji University, Shanghai 200092, China;3. Shanghai Nuclear Engineering Research and Design Institute, China |
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| Abstract: | The artificially periodic structures with the bandgap (BG) features provide a fantastic way for elastic wave manipulation. However, omnidirectional control of elastic waves at low-frequency remains a challenge, especially in the engineering application, due to the great different material parameters of the structure's components. In this work, we present the design of a three-dimensional syndiotactic metastructure (STM) and isotactic metastructure (ITM) composed of a single material with the same density and stiffness. A low-frequency broad bandgap occurs in the global band structure of STM. Meanwhile, it also retains the same high-frequency ultra-wide BG as that of ITM. The formation of the low-frequency BG of STM is attributed to the simultaneous activation of rotation and translation modes. The static deformation analysis indicates that STM has a unique translational and rotational coupling mechanism. The frequency response results reveal that the coupling mechanism can also enhance the attenuation of high-frequency BG. |
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| Keywords: | 3D syndiotactic metastructure Single-phase structure Ultra-low frequency Broadband |
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