A radial seismic metamaterial filled with auxetic foam for filtering low-frequency Lamb waves and surface waves

IF 4.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Acta Mechanica Sinica Pub Date : 2025-05-27 DOI:10.1007/s10409-025-24731-x

Pengfei Li (, ), Fan Yang (, ), Xuanxuan Hou (, ), Lingbo Li (, ), Jiacheng Wu (, ), Hualin Fan (, )

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引用次数: 0

Abstract

This study presents a novel radial seismic metamaterial (RSM) based on auxetic foam, which can achieve omnidirectional ultra-low-frequency suppression of Lamb waves in the range of 0.97 to 21.04 Hz and effectively shield omnidirectional surface waves within 10 Hz. Firstly, the Finite Element method is utilized to investigate the bandgap (BG) characteristics and vibration modes, which shows that the BG can be significantly widened by utilizing the local resonance of the auxetic foam. Subsequently, a three-dimensional radial periodic structure is constructed and the displacement fields of Lamb waves are analyzed in the frequency and time domains. The simulation results demonstrate that the proposed RSM can effectively attenuate Lamb waves. Parametric analysis indicates that filling auxetic foam with a high elastic modulus, low Poisson’s ratio, and low mass density can further expand the BG. For surface waves, the band structure is first analyzed using the acoustic cone method. Furthermore, a radial periodic structure consisting of the RSM cells is analyzed in the frequency domain, and a significant attenuation is observed within the BG. The attenuation capability of the designed RSM is further tested against real seismic wave signals, and a satisfactory shielding effect for low-frequency signals is achieved within 10 Hz. The designed RSM provides new insights into the development of SMs, exhibiting the superior application potential of auxetic foam for seismic wave shielding.

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一种滤除低频兰姆波和表面波的消声泡沫径向地震材料

提出了一种基于消声泡沫的新型径向地震超材料（RSM），该材料可以实现对0.97 ~ 21.04 Hz范围内兰姆波的全方位超低频抑制，并有效屏蔽10 Hz范围内的全方位面波。首先，利用有限元方法对带隙特性和振动模态进行了研究，结果表明，利用消声泡沫的局部共振可以显著拓宽带隙；在此基础上，构造了三维径向周期结构，分析了兰姆波的频域和时域位移场。仿真结果表明，该方法能有效地衰减兰姆波。参数分析表明，填充高弹性模量、低泊松比和低质量密度的发泡泡沫可以进一步扩大BG。对于表面波，首先用声锥法分析其能带结构。此外，在频域分析了由RSM单元组成的径向周期结构，并在BG内观察到明显的衰减。进一步测试了所设计的RSM对实际地震波信号的衰减能力，对10 Hz以内的低频信号取得了满意的屏蔽效果。所设计的消声泡沫为消声泡沫的发展提供了新的思路，显示了消声泡沫在地震波屏蔽方面的优越应用潜力。

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来源期刊

Acta Mechanica Sinica 物理-工程：机械

CiteScore

5.60

自引率

20.00%

发文量

1807

审稿时长

4 months

期刊介绍： Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics