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Large characteristic lengths in 3D chiral elastic metamaterials

Frenzel, Tobias; Hahn, Vincent; Ziemke, Patrick; Schneider, Jonathan Ludwig Günter; Chen, Yi; Kiefer, Pascal ORCID iD icon; Gumbsch, Peter; Wegener, Martin


Three-dimensional (3D) chiral mechanical metamaterials enable behaviors not accessible in ordinary materials. In particular, a coupling between displacements and rotations can occur, which is symmetry-forbidden without chirality. In this work, we solve three open challenges of chiral metamaterials. First, we provide a simple analytical model, which we use to rationalize the design of the chiral characteristic length. Second, using rapid multi-photon multi-focus 3D laser microprinting, we manufacture samples with more than 105 micrometer-sized 3D chiral unit cells. This number surpasses previous work by more than two orders of magnitude. Third, using analytical and numerical modeling, we realize chiral characteristic lengths of the order of ten unit cells, changing the sample-size dependence qualitatively and quantitatively. In the small-sample limit, the twist per axial strain is initially proportional to the sample side length, reaching a maximum at the characteristic length. In the thermodynamic limit, the twist per axial strain is proportional to the square of the characteristic length. We show that chiral micropolar continuum elasticity can reproduce this behavior.

Verlagsausgabe §
DOI: 10.5445/IR/1000131267
Veröffentlicht am 09.04.2021
DOI: 10.1038/s43246-020-00107-w
Zitationen: 31
Zitationen: 33
Cover der Publikation
Zugehörige Institution(en) am KIT 3D Matter Made to Order (3DMM2O)
Institut für Angewandte Materialien – Computational Materials Science (IAM-CMS)
Institut für Angewandte Physik (APH)
Institut für Nanotechnologie (INT)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
Karlsruhe School of Optics & Photonics (KSOP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2662-4443
KITopen-ID: 1000131267
HGF-Programm 43.32.02 (POF IV, LK 01) Designed Optical Materials
Erschienen in Communications materials
Verlag Springer Nature
Band 2
Heft 1
Seiten Art.Nr. 4
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 04.01.2021
Nachgewiesen in Dimensions
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