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Emerging topics in nanophononics and elastic, acoustic, and mechanical metamaterials: an overview

Krushynska, Anastasiia O. (author), Torrent, Daniel (author), Aragon, A.M. (author), Ardito, Raffaele (author), Bilal, Osama R. (author), Bonello, Bernard (author), Bosia, Federico (author), Chen, Yi (author), Janbaz, Shahram (author), Mirzaali, Mohammad J. (author)

This broad review summarizes recent advances and "hot"research topics in nanophononics and elastic, acoustic, and mechanical metamaterials based on results presented by the authors at the EUROMECH 610 Colloquium held on April 25-27, 2022 in Benicássim, Spain. The key goal of the colloquium was to highlight important developments in these...

review 2023

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Controlled metal crumpling as an alternative to folding for the fabrication of nanopatterned meta-biomaterials

Ganjian, M. (author), Janbaz, S. (author), van Manen, T. (author), Tümer, N. (author), Modaresifar, K. (author), Minneboo, M.B. (author), Fratila-Apachitei, E.L. (author), Zadpoor, A.A. (author)

We designed and fabricated a simple setup for the controlled crumpling of nanopatterned, surface-porous flat metallic sheets for the fabrication of volume-porous biomaterials and showed that crumpling can be considered as an efficient alternative to origami-inspired folding. Before crumpling, laser cutting was used to introduce pores to the...

journal article 2022

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4D printing of reconfigurable metamaterials and devices

van Manen, T. (author), Janbaz, S. (author), Jansen, K.M.B. (author), Zadpoor, A.A. (author)

Shape-shifting materials are a powerful tool for the fabrication of reconfigurable materials. Upon activation, not only a change in their shape but also a large shift in their material properties can be realized. As compared with the 4D printing of 2D-to-3D shape-shifting materials, the 4D printing of reconfigurable (i.e., 3D-to-3D shape...

journal article 2021

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Curvature Induced by Deflection in Thick Meta-Plates

Mirzaali, Mohammad J. (author), Ghorbani, Aref (author), Nakatani, Kenichi (author), Nouri Goushki, M. (author), Tümer, N. (author), Callens, S.J.P. (author), Janbaz, S. (author), Accardo, A. (author), Bico, José (author), Habibi, Mehdi (author), Zadpoor, A.A. (author)

The design of advanced functional devices often requires the use of intrinsically curved geometries that belong to the realm of non-Euclidean geometry and remain a challenge for traditional engineering approaches. Here, it is shown how the simple deflection of thick meta-plates based on hexagonal cellular mesostructures can be used to achieve...

journal article 2021

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Russian doll deployable meta-implants: Fusion of kirigami, origami, and multi-stability

Bobbert, F.S.L. (author), Janbaz, S. (author), van Manen, T. (author), Li, Y. (author), Zadpoor, A.A. (author)

Deployable meta-implants aim to minimize the invasiveness of orthopaedic surgeries by allowing for changes in their shape and size that are triggered by an external stimulus. Multi-stability enables deployable implants to transform their shape from some compact retracted state to the deployed state where they take their full sizes and are...

journal article 2020

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Strain rate-dependent mechanical metamaterials

Janbaz, S. (author), Narooei, K. (author), van Manen, T. (author), Zadpoor, A.A. (author)

Mechanical metamaterials are usually designed to exhibit novel properties and functionalities that are rare or even unprecedented. What is common among most previous designs is the quasi-static nature of their mechanical behavior. Here, we introduce a previously unidentified class of strain rate-dependent mechanical metamaterials. The...

journal article 2020

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Kirigami-enabled self-folding origami

van Manen, T. (author), Janbaz, S. (author), Ganjian, M. (author), Zadpoor, A.A. (author)

Self-folding of complex origami-inspired structures from flat states allows for the incorporation of a multitude of surface-related functionalities into the final 3D device. Several self-folding techniques have therefore been developed during the last few years to fabricate such multi-functional devices. The vast majority of such approaches...

journal article 2020

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Crumpling of thin sheets as a basis for creating mechanical metamaterials

Fokker, M. C. (author), Janbaz, S. (author), Zadpoor, A.A. (author)

crumpled thin sheets exhibit extraordinary characteristics such as a high strength combined with a low volume ratio. This review focuses on the physics of crumpled thin sheets, including the crumpling mechanics, crumpling methods, and the mechanical behavior of crumpled thin sheets. Most of the physical and mechanical properties of crumpled...

review 2019

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Ultra-programmable buckling-driven soft cellular mechanisms

Janbaz, S. (author), Bobbert, F.S.L. (author), Mirzaali, Mohammad J. (author), Zadpoor, A.A. (author)

Buckling, which was once considered the epitome of design failure, has been harnessed during the last few years to develop mechanical metamaterials with advanced functionalities. Soft robotics in general and soft actuators in particular could greatly benefit from such designer materials. Unlocking the great potential of buckling-driven...

journal article 2019

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Geometry does matter²

Janbaz, S. (author)

Nature is full of materials that exhibit astonishing properties that are not available in engineering materials. The study of the underlying structure of such materials has revealed that geometry plays an important role in achieving such properties. Unusual physical and mechanical properties such as structural coloring in butterfly wings and...

doctoral thesis 2018

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Rationally designed meta-implants: a combination of auxetic and conventional meta-biomaterials

Kolken, H.M.A. (author), Janbaz, S. (author), Leeflang, M.A. (author), Lietaert, K. (author), Weinans, Harrie (author), Zadpoor, A.A. (author)

Rationally designed meta-biomaterials present unprecedented combinations of mechanical, mass transport, and biological properties favorable for tissue regeneration. Here we introduce hybrid meta-biomaterials with rationally-distributed values of negative (auxetic) and positive Poisson’s ratios, and use them to design meta-implants that unlike...

journal article 2018

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Shape-matching soft mechanical metamaterials

Mirzaali, Mohammad J. (author), Janbaz, S. (author), Strano, M. (author), Vergani, L. (author), Zadpoor, A.A. (author)

Architectured materials with rationally designed geometries could be used to create mechanical metamaterials with unprecedented or rare properties and functionalities. Here, we introduce "shape-matching" metamaterials where the geometry of cellular structures comprising auxetic and conventional unit cells is designed so as to achieve a pre...

journal article 2018

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Towards deployable meta-implants

Bobbert, F.S.L. (author), Janbaz, S. (author), Zadpoor, A.A. (author)

Meta-biomaterials exhibit unprecedented or rare combinations of properties not usually found in nature. Such unusual mechanical, mass transport, and biological properties could be used to develop novel categories of orthopedic implants with superior performance, otherwise known as meta-implants. Here, we use bi-stable elements working on the...

journal article 2018

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Multimaterial control of instability in soft mechanical metamaterials

Janbaz, S. (author), McGuinness, M.M.S. (author), Zadpoor, A.A. (author)

Soft mechanical metamaterials working on the basis of instability have numerous potential applications in the context of "machine materials." Controlling the onset of instability is usually required when rationally designing such metamaterials. We study the isolated and modulated effects of geometrical design and material distribution on the...

journal article 2018

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Length-scale dependency of biomimetic hard-soft composites

Mirzaali, Mohammad J. (author), Edens, M. E. (author), de la Nava, A. Herranz (author), Janbaz, S. (author), Vena, P. (author), Doubrovski, E.L. (author), Zadpoor, A.A. (author)

Biomimetic composites are usually made by combining hard and soft phases using, for example, multi-material additive manufacturing (AM). Like other fabrication methods, AM techniques are limited by the resolution of the device, hence, setting a minimum length scale. The effects of this length scale on the performance of hard-soft composites...

journal article 2018

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Multi-material 3D printed mechanical metamaterials: Rational design of elastic properties through spatial distribution of hard and soft phases

Mirzaali, Mohammad J. (author), Caracciolo, A. (author), Pahlavani, H. (author), Janbaz, S. (author), Vergani, L. (author), Zadpoor, A.A. (author)

Up until recently, the rational design of mechanical metamaterials has usually involved devising geometrical arrangements of micro-architectures that deliver unusual properties on the macro-scale. A less explored route to rational design is spatially distributing materials with different properties within lattice structures to achieve the...

journal article 2018

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Programming the shape-shifting of flat soft matter

van Manen, T. (author), Janbaz, S. (author), Zadpoor, A.A. (author)

Shape-shifting of flat materials into the desired 3D configuration is an alternative design route for fabrication of complex 3D shapes, which provides many benefits such as access to the flat material surface and the ability to produce well-described motions. The advanced production techniques that primarily work in 2D could then be used to...

review 2018

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How does tissue regeneration influence the mechanical behavior of additively manufactured porous biomaterials?

Hedayati, R. (author), Janbaz, S. (author), Sadighi, M. (author), Mohammadi-Aghdam, M. (author), Zadpoor, A.A. (author)

Although the initial mechanical properties of additively manufactured porous biomaterials are intensively studied during the last few years, almost no information is available regarding the evolution of the mechanical properties of implant-bone complex as the tissue regeneration progresses. In this paper, we studied the effects of tissue...

journal article 2017

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Programming 2D/3D shape-shifting with hobbyist 3D printers

van Manen, T. (author), Janbaz, S. (author), Zadpoor, A.A. (author)

Materials and devices with advanced functionalities often need to combine complex 3D shapes with functionality-inducing surface features. Precisely controlled bio-nanopatterns, printed electronic components, and sensors/actuators are all examples of such surface features. However, the vast majority of the refined technologies that are currently...

journal article 2017

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Crumpling-based soft metamaterials: The effects of sheet pore size and porosity

Mirzaali, Mohammad J. (author), Habibi, M. (author), Janbaz, S. (author), Vergani, L. (author), Zadpoor, A.A. (author)

Crumpled-based materials are relatively easy to fabricate and show robust mechanical properties for practical applications, including meta-biomaterials design aimed for improved tissue regeneration. For such requests, however, the structure needs to be porous. We introduce a crumpled holey thin sheet as a robust bio-metamaterial and measure...

journal article 2017