Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q14: Functionality through Nonlinearity in Soft Robotics
3:00 PM–6:00 PM,
Wednesday, March 8, 2023
Room: Room 206
Sponsoring
Unit:
DSOFT
Chair: Douglas Tree, Brigham Young University; Benjamin Gorissen, KU Leuven
Abstract: Q14.00015 : A metafluid with multistable thermodynamic properties
5:48 PM–6:00 PM
Presenter:
Amir D Gat
(Technion - Israel Institute of Technology)
Author:
Amir D Gat
(Technion - Israel Institute of Technology)
In this work, we study the properties of a suspension composed of a multitude of lubricated multistable capsules (structures capable of transforming between different equilibrium deformation patterns) enclosing a compressible gas and immersed within another fluid. The thermodynamic properties of the suspension are determined by an interaction between the external liquid, the encapsulated gas, and the characteristic elastic energy profile of the capsules. By leveraging the elastic multistability of the suspended capsules, we can produce a fluid with multiple stable density points for a given pressure and temperature states as well as unstable regions.
We study the pressure-density relations, and stability, of a ``metafluid”, composed of a multitude of multistable gas-filled capsules suspended in a liquid. As a simple example of a multistable capsule, we examine multiple connected bi-stable elements, produced by combining two non-identical conical frusta in opposing orientations. Bi-stability is therefore achieved by switching between extended and collapsed states through the inversion of one frustum which creates a significant change in volume. We theoretically and experimentally examine the suspension’s internal energy, equilibrium pressure-density relations, and their stability for both adiabatic and isothermal processes. We show that the elastic multistability of the capsules endows the fluid with multistable thermodynamic properties, including the ability to capture and store energy at standard atmospheric conditions, not found in naturally available fluids.
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