Session: 17-01-01: Research Posters

Paper Number: 143257

143257 - Selective Floppy Mode Triggering in Kagome Chains 

The kinematics of kagome lattices, a prominent subclass within 2D Maxwell lattices, are controlled by the twist angle, between adjacent triangles. As we sweep the twist angle, the lattice transitions from an open state ($180^{\circ}$) to a fully folded state ($0^{\circ}$), where all the triangles collapse and align to form a 1D-periodic prismatic structure whose kinematics resemble those of a torsional chain. Our study explores systematically the twist angle design space of kagome families to reveal exotic emergent behaviors enabled by this collapse mechanism. Of particular interest is the case of the $\theta=0^{\circ}$ chain, which has the capability of hosting bulk zero modes. We conduct simulations and experiments on physical prototypes to elucidate the peculiar ways in which floppy modes manifest in the chain. By establishing a one-to-one mapping between the floppy modes in the canonical regular kagome lattice and in the chain, our investigation reveals unexpected mechanistic implications of working with a fully collapsed lattice, including the emergence of programmable non-local floppy twist sequences.

Presenting Author: Pegah Azizi University of Minnesota

Presenting Author Biography: I am currently a third-year Ph.D. student at the University of Minnesota, conducting research under the guidance of Professor Gonella. My work revolves around the numerical simulation and experimental exploration, with a specific focus on periodic structures and phononic metamaterials.

Authors:

Pegah Azizi University of Minnesota
Stefano Gonella University of Minnesota