Distinct Buckling Modes In Mechanical Metamaterials With Stiff Square Networks And Periodically Arranged Voids

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2021 by IJETT Journal
Volume-69 Issue-4
Year of Publication : 2021
Authors : Peter Nikitin, Ivan Smirnov, Slava Slesarenko
DOI :  10.14445/22315381/IJETT-V69I4P225


MLA Style: Peter Nikitin, Ivan Smirnov, Slava Slesarenko  "Distinct Buckling Modes In Mechanical Metamaterials With Stiff Square Networks And Periodically Arranged Voids" International Journal of Engineering Trends and Technology 69.4(2021):177-182. 

APA Style:Peter Nikitin, Ivan Smirnov, Slava Slesarenko. Distinct Buckling Modes In Mechanical Metamaterials With Stiff Square Networks And Periodically Arranged Voids  International Journal of Engineering Trends and Technology, 69(4),177-182.

Extreme properties of mechanical metamaterials originate in their involved internal architecture. Instability-driven metamaterials harness the phenomenon of elastic buckling accompanied by significant reconfigurations of the architecture to facilitate the variability of their properties. Two common geometrical motifs often used in the design of instability-driven metamaterials are periodically arranged voids embedded into a soft deformable matrix and stiff periodic lattices with different architectures. Here the buckling behavior of metamaterials that combine these two design ideas is studied. By employing the Bloch-Floquet approach, it is demonstrated that the involved interplay between two periodic patterns significantly affects the critical strain values corresponding to the onset of instability. Moreover, two distinct buckling modes defined by the number of periodically arranged voids in the unit cell are observed. If the unit cell contains an even number of voids, then the local mode accompanied by equivalent reconfiguration in every unit cell is realized. However, if the unit cell contains an odd number of voids, then metamaterial acquires new periodicity via the formation of alternating patterns. The observed interplay between two periodic systems within one metamaterial can be further employed for more advanced designs to control the propagation of elastic waves.

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buckling; elastic instabilities; mechanical metamaterials; reconfiguration; structure