Manuscript Topics

Mechanical metamaterials (MMs) are artificial materials with extraordinary properties. MMs are generally comprised of periodic arrays of unit cells which mimic ‘meta-atoms’. These orderly arranged unit cells can generate unusual macroscopic properties, such as being reversible to wave propagation, being auxetic or having negative stiffness (decreasing stress causing increasing strain). Wide attentions have been gathered from industry and the research community due to not only MMs’ outstanding characteristics but also their prevalent applications: great potentials have been found for MMs used in vibration shielding, wireless chargers, over-the-diffraction-limit ultrasonic imaging, cloaking devices, building blocks of robots and smart materials, etc. Many challenges however remain before these attractive possibilities become realities. For instance, in the case of elastic metamaterials, the challenge is related to a wave environment where the design principle of the metamaterials relies heavily on the creation of appropriate local resonances (resonance in the unit cell) and their interplay with background waves. While the local resonance mechanism for generating exotic properties is not well understood yet because of the complex coupling occurring among various deformation modes such as longitudinal, bending and shear motions. Further, noted that the main difference compared to classical materials is the addition of the mesoscopic scale into the mechanical metamaterials design space, the new challenges are presented for the design of functional components, their manufacturing and characterization.

This Special Issue aims to bring together the most recent advances associated with the latest techniques and methods for mechanical metamaterial design. We encourage the submissions of original research articles, perspectives, opinion articles, and reviews that focus on, but are not limited to, the latest developments and achievements of metamaterials based on the newly emergent materials, structures, and physics, as well as their practical applications in engineering.

Key words:
Mechanical metamaterials
Bandgaps
Intelligent metamaterials
Acoustic / phononic metamaterials
Elastic metamaterials
3D Finite metamaterials
Rainbow metamaterial
Cosserat and micropolar metamaterials
Electronic mechanical metamaterials

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