Experimental demonstration of broadband reconfigurable mechanical nonreciprocity

Mehrvarz, Amin; Khodaei, Mohammad Javad; Darabi, Amir; Zareei, Ahmad; Jalili, Nader

doi:10.1177/10775463221146091

Cited by 2 publications

(2 citation statements)

References 48 publications

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“…In fluids and solids, the principle of reciprocity in acoustics and elastodynamics codifies a relation of symmetry between action and reaction, which is hard to overcome when time-reversal symmetry applies 24 . Materials exhibiting nonreciprocity, also termed Willis coupling for elastic waves in solids [55][56][57] , however, promise to regulate waves unidirectionally [58][59][60][61][62][63][64][65][66][67][68][69][70] . Coulais et al showed that it is possible to break reciprocity in slightly non-linear static systems, obtaining mechanical metamaterials with asymmetric output under excitation from different directions 23 .…”

Section: Introductionmentioning

confidence: 99%

Non-reciprocal and Non-Newtonian Mechanical Metamaterials

Wang

Martínez

Ulliac

et al. 2023

Preprint

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Non-Newtonian liquids are characterized by a stress and velocity-dependent dynamical response. In elasticity, and in particular in the field of phononics, reciprocity in the equations acts against obtaining a directional response for passive media. Active stimuli-responsive materials have been conceived to overcome it. Significantly, Milton and Willis have shown theoretically in 2007 that quasi-rigid bodies containing masses at resonance can display a very rich dynamical behavior, hence opening a route toward the design of non-reciprocal and non-Newtonian metamaterials. In this paper, we design a solid structure that displays unidirectional shock resistance, thus going beyond Newton’s second law in analogy to non-Newtonian fluids. We design the mechanical metamaterial with finite element analysis and fabricate it using 3D printing at the centimetric scale (with fused deposition modeling – FDM) and at the micrometric scale (with two-photon lithography – TPL). The non-Newtonian elastic response is measured via dynamical velocity-dependent experiments. Reversing the direction of the impact, we further highlight the intrinsic non-reciprocal response.

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Section: Introductionmentioning

confidence: 99%

Non-reciprocal and Non-Newtonian Mechanical Metamaterials

Wang

Martínez

Ulliac

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In fluids and solids, the principle of reciprocity in acoustics and elastodynamics codifies a relation of symmetry between action and reaction, which is hard to overcome when time-reversal symmetry applies 24 . Materials exhibiting nonreciprocity, also termed Willis coupling for elastic waves in solids [59][60][61] , however, promise to regulate waves unidirectionally [62][63][64][65][66][67][68][69][70][71][72][73][74] . Coulais et al showed that it is possible to break reciprocity in slightly non-linear static systems, obtaining mechanical metamaterials with asymmetric output under excitation from different directions 23 .…”

mentioning

confidence: 99%

Non-reciprocal and non-Newtonian mechanical metamaterials

et al. 2023

View full text Add to dashboard Cite

Non-Newtonian liquids are characterized by stress and velocity-dependent dynamical response. In elasticity, and in particular, in the field of phononics, reciprocity in the equations acts against obtaining a directional response for passive media. Active stimuli-responsive materials have been conceived to overcome it. Significantly, Milton and Willis have shown theoretically in 2007 that quasi-rigid bodies containing masses at resonance can display a very rich dynamical behavior, hence opening a route toward the design of non-reciprocal and non-Newtonian metamaterials. In this paper, we design a solid structure that displays unidirectional shock resistance, thus going beyond Newton’s second law in analogy to non-Newtonian fluids. We design the mechanical metamaterial with finite element analysis and fabricate it using three-dimensional printing at the centimetric scale (with fused deposition modeling) and at the micrometric scale (with two-photon lithography). The non-Newtonian elastic response is measured via dynamical velocity-dependent experiments. Reversing the direction of the impact, we further highlight the intrinsic non-reciprocal response.

show abstract

Experimental demonstration of broadband reconfigurable mechanical nonreciprocity

Cited by 2 publications

References 48 publications

Non-reciprocal and Non-Newtonian Mechanical Metamaterials

Non-reciprocal and Non-Newtonian Mechanical Metamaterials

Non-reciprocal and non-Newtonian mechanical metamaterials

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