4.6 Article

The Emergence of Sequential Buckling in Reconfigurable Hexagonal Networks Embedded into Soft Matrix

Journal

MATERIALS
Volume 14, Issue 8, Pages -

Publisher

MDPI
DOI: 10.3390/ma14082038

Keywords

mechanical metamaterials; buckling; sequential buckling; instabilities; elastic wave propagation; reconfiguration

Funding

  1. Russian Scientific Foundation [20-71-00017]
  2. Russian Science Foundation [20-71-00017] Funding Source: Russian Science Foundation

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The extreme and unconventional properties of mechanical metamaterials are determined by their sophisticated internal architectures, which can be altered by utilizing the elastic instability phenomenon. Specifically, mechanical metamaterials consisting of hexagonal networks can undergo sequential buckling at different strain levels, leading to changes in their periodicity and formation of new unit cells. The critical strains for these buckling behaviors depend on the metamaterial geometry and elastic moduli ratios, and can be further controlled by the placement of rigid circular inclusions.
The extreme and unconventional properties of mechanical metamaterials originate in their sophisticated internal architectures. Traditionally, the architecture of mechanical metamaterials is decided on in the design stage and cannot be altered after fabrication. However, the phenomenon of elastic instability, usually accompanied by a reconfiguration in periodic lattices, can be harnessed to alter their mechanical properties. Here, we study the behavior of mechanical metamaterials consisting of hexagonal networks embedded into a soft matrix. Using finite element analysis, we reveal that under specific conditions, such metamaterials can undergo sequential buckling at two different strain levels. While the first reconfiguration keeps the periodicity of the metamaterial intact, the secondary buckling is accompanied by the change in the global periodicity and formation of a new periodic unit cell. We reveal that the critical strains for the first and the second buckling depend on the metamaterial geometry and the ratio between elastic moduli. Moreover, we demonstrate that the buckling behavior can be further controlled by the placement of the rigid circular inclusions in the rotation centers of order 6. The observed sequential buckling in bulk metamaterials can provide additional routes to program their mechanical behavior and control the propagation of elastic waves.

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