Journal article
Mechanical Properties of Acoustically Levitated Granular Rafts
Physical review. X, v 12(2), p021017
01 Apr 2022
Abstract
We investigate a model system for the rotational dynamics of inertial many-particle clustering, in which submillimeter objects are acoustically levitated in air. Driven by scattered sound, levitated grains self-assemble into a monolayer of particles, forming mesoscopic granular rafts with both an acoustic binding energy and a bending rigidity. Detuning the acoustic trap can give rise to stochastic forces and torques that impart angular momentum to levitated objects. As the angular momentum of a quasi-two-dimensional granular raft is increased, the raft deforms from a disk to an ellipse, eventually pinching off into multiple separate rafts, in a mechanism that resembles the breakup of a liquid drop. We extract the raft effective surface tension and elastic modulus and show that nonpairwise acoustic forces give rise to effective elastic moduli that scale with the raft size. We also show that the raft size controls the microstructural basis of plastic deformation, resulting in a transition from fracture to ductile failure.
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Details
- Title
- Mechanical Properties of Acoustically Levitated Granular Rafts
- Creators
- Melody Lim - University of ChicagoBryan VanSaders - University of ChicagoAnton Souslov - University of ChicagoHeinrich Jaeger - University of Chicago
- Publication Details
- Physical review. X, v 12(2), p021017
- Publisher
- American Physical Society
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000798294900001
- Scopus ID
- 2-s2.0-85130407375
- Other Identifier
- 991021877482104721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Multidisciplinary