Inverted and Programmable Poynting Effects in Metamaterials

Autor: Daniel Bonn, Corentin Coulais, David M. J. Dykstra, Mehdi Habibi, Aref Ghorbani, Erik van der Linden
Přispěvatelé: IoP (FNWI), Soft Matter (WZI, IoP, FNWI)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Physics and Physical Chemistry of Foods
Science
General Chemical Engineering
General Physics and Astronomy
Medicine (miscellaneous)
FOS: Physical sciences
02 engineering and technology
Condensed Matter - Soft Condensed Matter
01 natural sciences
Biochemistry
Genetics and Molecular Biology (miscellaneous)
Elastic Modulus
0103 physical sciences
Pressure
General Materials Science
010306 general physics
Elastic modulus
Research Articles
VLAG
Physics
Normal force
Isotropy
General Engineering
Torsion (mechanics)
Metamaterial
torsion
Models
Theoretical
021001 nanoscience & nanotechnology
Elasticity
Shear (sheet metal)
Nonlinear system
Classical mechanics
normal force
Printing
Three-Dimensional
Poynting vector
Poynting effect
Soft Condensed Matter (cond-mat.soft)
mechanical metamaterials
Stress
Mechanical
normal and shear moduli
Shear Strength
0210 nano-technology
Research Article
Zdroj: Advanced Science, 8(20):2102279. Wiley-VCH Verlag
Advanced Science
Advanced Science, Vol 8, Iss 20, Pp n/a-n/a (2021)
Advanced Science 8 (2021) 20
Advanced Science, 8(20)
ISSN: 2198-3844
Popis: The Poynting effect generically manifests itself as the extension of the material in the direction perpendicular to an applied shear deformation (torsion) and is a material parameter hard to design. Unlike isotropic solids, in designed structures, peculiar couplings between shear and normal deformations can be achieved and exploited for practical applications. Here, a metamaterial is engineered that can be programmed to contract or extend under torsion and undergo nonlinear twist under compression. First, it is shown that the system exhibits a novel type of inverted Poynting effect, where axial compression induces a nonlinear torsion. Then the Poynting modulus of the structure is programmed from initial negative values to zero and positive values via a pre‐compression applied prior to torsion. The work opens avenues for programming nonlinear elastic moduli of materials and tuning the couplings between shear and normal responses by rational design. Obtaining inverted and programmable Poynting effects in metamaterials inspires diverse applications from designing machine materials, soft robots, and actuators to engineering biological tissues, implants, and prosthetic devices functioning under compression and torsion.
A rationally designed meta‐cylinder exhibits inverted and programmable Poynting effects. It shows nonlinear torsions under compression (inverted Poynting) and contractions under torsion. By applying a level of pre‐compression the structure can be programmed to induce tunable contraction or dilation (negative or positive Poynting effect) when twisted.
Databáze: OpenAIRE
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