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SUMMARY:Inverse design of discrete mechanical metamaterials - Henrik Ronel
 lenfitsch (Massachusetts Institute of Technology)
DTSTART:20190517T092000Z
DTEND:20190517T094000Z
UID:TALK124675@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Mechanical and phononic metamaterials exhibiting negative elas
 tic moduli\, gapped vibrational spectra or topologically protected modes e
 nable precise control of structural and acoustic functionalities. While mu
 ch progress has been made in their experimental and theoretical characteri
 zation\, the inverse design of mechanical metamaterials with arbitrarily p
 rogrammable spectral properties and mode localization still poses an unsol
 ved problem. Here\, we present a flexible computational inverse-design fra
 mework that allows the efficient tuning of one or more gaps at nearly arbi
 trary positions in the spectrum of discrete phononic metamaterial structur
 es.  The underlying algorithm optimizes the linear response of elastic net
 works directly\, is applicable to ordered and disordered structures\, scal
 es efficiently in 2D and 3D\, and can be combined with a wide range of num
 erical optimization schemes. We illustrate the broad practical potential o
 f this approach by designing mechanical bandgap switches that open and clo
 se pre-programmed spectral gaps in response to an externally applied stimu
 lus such as shear or compression. We further show that the designed struct
 ures can host topologically protected edge modes\, and validate the numeri
 cal predictions through explicit 3D finite element simulations of continuu
 m elastica with experimentally relevant material parameters. Generally\, t
 his network-based inverse design paradigm offers a direct pathway towards 
 manufacturing phononic metamaterials\, DNA origami structures and topolect
 ric circuits that can realize a wide range of static and dynamic target fu
 nctionalities.  Joint work with Norbert Stoop\, Josephine Yu\, Aden Forrow
 \, Joern Dunkel
LOCATION:Seminar Room 1\, Newton Institute
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