Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session H53: Elasto-Active InstabilitiesInvited
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Sponsoring Units: GSOFT GSNP Chair: Corentin Coulais, University of Amsterdam Room: BCEC 253C |
Tuesday, March 5, 2019 2:30PM - 3:06PM |
H53.00001: Soft Robots: Functionality via Instabilities Invited Speaker: Katia Bertoldi Soft robots made of compliant materials have drawn significant attention over the past few years because of their ability to produce complex and adaptive motions through nonlinear deformation. The simplicity of their design, ease of fabrication and low cost sparked the emergence of soft robots capable of walking, crawling, camouflaging and assisting humans in grasping. In this talk, I will show that the response of these soft machines can be further enhanced by embracing instabilities. While instabilities have traditionally been avoided as they often represent mechanical failure, here we exploit them to amplify the response of soft actuators, facilitate their motion and trigger instantaneous and significant changes in shape. |
Tuesday, March 5, 2019 3:06PM - 3:42PM |
H53.00002: Fluttering and dancing elastic rods: the dynamics of the elastica subject to follower and configurational forces Invited Speaker: Davide Bigoni Using the elastica theory, configurational or 'Eshelby-like' forces will be shown to arise in elastic structures when a change in configuration is possible, with a related release of energy. Configurational forces will be shown to influence the dynamics of a falling body connected through an elastic rod to a sliding sleeve, so that a damped nonlinear oscillator results, which generates a complex motion, nicknamed 'dancing'. |
Tuesday, March 5, 2019 3:42PM - 4:18PM |
H53.00003: From the onset of creasing as a Kosterlitz-Thouless transition to "buckling without bending" in morphogenesis Invited Speaker: J. M. Schwarz Cusped inward folds, known as creases, form on a free surface of a soft disordered solid under compression at critical strains below that of buckling. Harnessing a model for composite elastic materials, quasi-particle excitations termed ghost shear lag fibers serve as surface stress localizers to initiate this creasing transition. The mathematics of these stress localizers maps to charges on the free surface of the solid. This mapping, combined with the presence of fluctuations due to the underlying disordered material under compression, point to the creasing transition as a Kosterlitz-Thouless transition. For the sake of contrast, a new shape-changing mechanism, termed "buckling without bending", involving not only solid material but a proliferating fluid layer under mechanical constraints will also be presented. The implications of creasing, buckling, and "buckling without bending" for the cerebrum, the cerebellum, and brain organoids will be addressed along the way. |
Tuesday, March 5, 2019 4:18PM - 4:54PM |
H53.00004: Interplay between elasticity and activity: from vibrated elastic particles to penetration of active particles through elastic membranes Invited Speaker: Hartmut Loewen
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Tuesday, March 5, 2019 4:54PM - 5:30PM |
H53.00005: Patterning via differential activity Invited Speaker: L Mahadevan It is well known that soft dispersed and condensed phases can be patterned due to variations in some property X, where X = size, shape, adhesion, diffusion, growth, erosion, deposition, activity etc. I will discuss the last of these using two examples of differential-activity-driven patterning in biological systems: |
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