Mechanical metamaterials are different from other functional materials from the material point of view. Their superior mechanical properties are mainly derived from local microstructure cells. In recent years, with the development of mechanical metamaterials, triboelectric materials with both energy harvesting and monitoring and sensing functions have brought new directions for the intelligent development of multifunctional mechanical metamaterials.

This paper proposes a self-sensing composite mechanical metamaterial—mechanical super-friction material, which prepares triboelectric materials in mechanical metamaterials. By using mechanical metamaterials as nano-generator media, the overall structure of materials can be used for energy harvesting and intelligent monitoring and sensing. Multi-functional applications.

Mechanical ultra-friction materials use 3D printing technology to experimentally prepare seamlessly integrated self-healing occlusal microstructures composed of triboelectric materials, and test and characterize their self-power and self-induction properties. In this paper, theoretical methods are used to discuss the deformation mechanism and electric energy generation mechanism of occluding microstructures under cyclic loading.

This research was jointly carried out by the Department of Civil Engineering of the University of Pittsburgh, Zhejiang University College of Oceanography, and the Beijing Institute of Nano Energy and Systems, Chinese Academy of Sciences. A related paper entitled "Multifunctional Meta-Tribo material Nanogenerators for Energy Harvesting and Active Sensing" was published in "Nano Energy". The first author of this article is a joint Ph.D student, the co-first author is researcher Jiao Pengcheng, and the corresponding authors are Academician Wang Zhonglin and Assistant Professor A.H. Alavi.

The mechanical superfriction material proposed in this paper designs the triboelectric material in the microstructure cell of the mechanical metamaterial, so that the overall structure material not only has the superior mechanical properties of the mechanical metamaterial, but also has the energy collection, monitoring and sensing functions of the friction nanogenerator.

Mechanics ultra-friction materials use various organic and inorganic triboelectric materials to design complex layered composite structures. This paper uses experimental and theoretical methods to systematically study the mechanical-electrical properties of mechanical super-friction materials, and prospects the multi-functional engineering applications of mechanical super-friction materials integrated systems, such as marine engineering disaster prevention and mitigation self-energy monitoring and sensing equipment, self-sensing self-energy Cardiovascular stents, etc.

In this paper, the new progress of nano-energy is applied to advanced structural materials, and an intelligent structural material—multifunctional mechanical super-friction material is proposed. Based on the superior mechanical properties of mechanical metamaterials, the energy harvesting and intelligent monitoring and sensing of nano-generators can be realized. At the same time, the concept of mechanical ultra-friction materials proposed in this paper can be applied to other types of functional materials with different structural designs. Innovative applications in many fields such as medical equipment (medical implants, stents, artificial muscles) have been realized.