The invention is a multilayer metamaterial with chiral microstructure involving internal friction mechanisms to damp vibrations and shock mitigation in industrial, naval, aerospace and civil applications. The self-recovering metamaterial returns in the initial configuration after every application thus allowing the repetition of its use.

The metamaterial consists of a repetition of chiral geometric grids made by periodically assembling hard disks connected by elastic ligaments. By applying biaxial traction and / or compression stresses to the generic chiral layer, the rotation of the discs is obtained; the alternation of the chirality of the layers in the metamaterial involves relative rotations between the discs. The through pins fix each stack of discs and, due to the dilating interface present between the discs and the friction between the faces in contact, a mechanical response is obtained which, while being considerably dissipative, returns to its initial state when the material is downloaded. In this way, a mechanical system is obtained which dissipates energy at every load level and is therefore capable of significantly attenuating vibrations or absorbing energy in impacts while being reusable at the end of its functionality. TRL-2.

• Railway Industry;
• Shipbuilding industry;
• Aerospace industry;
• Automotive industry;
• Seismic Engineering;
• Industrial construction.

• Hysteric response with high energy dissipation;
• Reuse of the device at the end of the dynamic process without any external operation;
• Dissipative response to biaxial stress states;
• Equal tensile and compressive material response;
• Scalable and modular material.