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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

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Static non-reciprocity in mechanical metamaterials.

Corentin Coulais^1,2, Dimitrios Sounas³, Andrea Alù³

¹AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.

|February 14, 2017

Summary

Researchers demonstrate breaking reciprocity in static mechanical metamaterials. These materials show asymmetric responses and one-way amplification, enabling new applications in energy harvesting and soft robotics.

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Area of Science:

* Physics
* Materials Science
* Metamaterials

Background:

* Reciprocity is a fundamental principle in physics, ensuring symmetrical signal transmission between two points.
* Breaking reciprocity (non-reciprocity) allows for enhanced control over signal transport and isolation.
* Previous non-reciprocal devices primarily operated in dynamic systems (electromagnetic, acoustic, mechanical waves).

Purpose of the Study:

* To demonstrate the breaking of reciprocity in static mechanical systems.
* To realize mechanical metamaterials with asymmetric responses and one-way amplification.
* To explore applications of static non-reciprocity.

Main Methods:

* Development of mechanical metamaterials incorporating large nonlinearities.
* Integration of geometrical asymmetries and/or topological features into the metamaterial design.
* Experimental testing of static mechanical responses to excitation from different sides.

Main Results:

* Achieved mechanical metamaterials exhibiting significantly different output displacements depending on the excitation direction.
* Demonstrated one-way displacement amplification in static conditions.
* Extended the principle of non-reciprocity from dynamic to static systems.

Conclusions:

* Reciprocity can be broken in static mechanical systems, challenging previous limitations.
* Non-reciprocal metamaterials offer novel possibilities for signal control, isolation, and energy manipulation.
* Potential applications include energy absorption, conversion, harvesting, soft robotics, prosthetics, and optomechanics.