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SUMMARY:Active Elasticity in non-reciprocal robotic metamaterials - Dr. Ja
 ck Binysh\, University of Amsterdam
DTSTART:20240524T130000Z
DTEND:20240524T140000Z
UID:TALK217126@talks.cam.ac.uk
CONTACT:Gaurav
DESCRIPTION:Non-reciprocal interactions in active elastic media cause work
  cycles and wave propagation forbidden in equilibrium. These linear phenom
 ena offer a route to designing autonomous materials that spontaneously cra
 wl\, roll or swim. Yet these same phenomena also render non-reciprocal mat
 erials hard to design\, and force us to reckon with active elastodynamics 
 beyond the linear regime.\n \nIn this talk I will describe our current wor
 k on rationally designing non-reciprocal materials made of robots\, and mo
 delling their collective dynamics. First I will show that odd elasticity\,
  the continuum hallmark of microscopic non-reciprocity\, emerges in a broa
 d range of lattices made of non-reciprocal springs. Strikingly however\, w
 e find that the strength of odd response strongly depends on the precise l
 attice geometry. Hyperstatic lattices are needlessly hard to actuate\, lea
 ding to sub-optimal odd response. By contrast\, we find that in overly flo
 ppy lattices\, zero modes couple to microscopic non-reciprocity\, destroyi
 ng odd moduli entirely. By avoiding these pitfalls\, we identify optimal d
 esign principles for building odd lattices.\n \nAfter connecting microscal
 e non-reciprocity to macroscale elasticity\, I will then present a continu
 um model of nonlinear odd elasticity\, benchmarked against microscopic sim
 ulation and table-top experiments. Combining non-reciprocity and non-linea
 rity in momentum-conserving materials yields long-wavelength instabilities
  and travelling nonlinear patterns. Strikingly\, momentum conservation cau
 ses these emergent patterns to coarsen over time. As a result\, these acti
 ve metamaterials spontaneously rid themselves of disorder in favour of coh
 erent motion. We then explore how this coarsening can respond to environme
 ntal stimuli\, leading to a toolkit of distinct patterns for designing loc
 omotion and actuation.
LOCATION:TCM Seminar Room
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