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Realizing polarization band gaps and fluid-like elasticity by thin-plate elastic metamaterials

机译：通过薄板弹性超材料实现偏振带间隙和流体状弹性

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摘要

The flexible manipulation of elastic waves that exhibit abundant polarization characteristics in solid structures can be realized through ingenious microstructure design, thus accomplishing various unique physical proper-ties. This paper proposes a lightweight, thin-plate elastic metamaterial with transverse, longitudinal, and tor-sional wave polarization band gaps. Due to the spatial asymmetry of the unit cell, the band gaps do not overlap and can achieve the selective suppression of elastic waves exhibiting different polarization forms. In addition, the stopband of the flexural vibrational overlaps the passband of the longitudinal vibration, allowing a fluid-like elasticity capable of transmitting longitudinal waves but not transverse waves to be realized via a multi-cellular elastic rod-like structure with integrated multiple unit cells. A corresponding rod-like structure was fabricated and verified, achieving a fluid-like elasticity through vibrational measurements. Furthermore, the unit cell behaves a negative moment of inertia characteristic in the torsional wave band gap, which can effec-tively attenuate the torsional vibrational propagation of the rod-like structure with integrated multiple unit cells in another form. This proposed elastic metamaterial structure can provide a practical implementation scheme for the separation and manipulation of elastic waves in different polarization forms in solid structures.
机译：通过巧妙的微观结构设计可以实现在实心结构中表现出固体结构丰富的偏振特性的弹性波的柔性操作，从而实现各种独特的物理适当关系。本文提出了一种具有横向，纵向和扭矩波偏振带间隙的轻质，薄板弹性超材料。由于单元电池的空间不对称，带间隙不重叠，并且可以实现具有不同偏振片的弹性波的选择性抑制。另外，弯曲振动的阻带与纵向振动的通带重叠，允许能够通过具有集成多单元电池的多蜂窝弹性杆状结构来实现能够传递纵向波的流体状弹性而不是通过具有集成的多个单元电池的多蜂窝弹性杆状结构来实现横向波。通过振动测量来制造和验证相应的杆状结构并验证，实现流体状弹性。此外，单元电池在扭转波带间隙中表现出惯性特性的负矩，这可以在另一种形式中具有与集成的多个单元电池的杆状结构的扭转振动传播有效地衰减。该提出的弹性超材料结构可以提供实际的实施方案，用于在固体结构中以不同偏振形式的不同偏振形式的弹性波分离和操纵。

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