Special Issue "Multiscale Innovative Materials and Structures"
Deadline for manuscript submissions: 31 August 2021.
Interests: continuum mechanics; non-local elasticity; beam theories; plate theories; fracture mechanics
Special Issues and Collections in MDPI journals
Special Issue in Symmetry: Time and Space Nonlocal Operators in Structural Mechanics
Special Issue in Applied Mechanics: Mechanics Applied in Construction Engineering
Topical Collection in Encyclopedia: Encyclopedia of Engineering
Interests: Finite elasticity; Linear and nonlinear kinematics; Membrane tensile structures; Fibre reinforced composite material mechanics; Masonry structure mechanics; Multilayer solids; Elastic bodies with non-convex energies; Biological material and metamaterials; Electroactive Polymers (EAP) devices
Interests: multiscale modeling and simulation of solids and structures; nonlinear dynamics of materials and structures; design and engineering of sustainable materials at multiple scales
Special Issues and Collections in MDPI journals
Special Issue in Applied Sciences: Advanced Assessment of Resilient Systems
Nanomaterials are currently essential constituents of ground-breaking nano-electromechanical systems (NEMS). There is increasing attention in multiscale metamaterials and a rising demand for exploring the potential of such novel systems in real-life engineering applications, including: smart buildings, antiseismic engineering, and structural health monitoring. Investigation of the size-dependent response of advanced materials and structures has gained intensive interest in literature due to the vast application of NEMS in a broad spectrum of modern nanoengineering systems. Local approaches of continuum mechanics are not able to effectively describe the size-dependent behavior of nanomedia, and thus, development of suitable analytical and numerical models is of major significance in design and optimization of materials and devices in the small-scale range.
This Special Issue on Multiscale Innovative Materials and Structures is aimed at extending the fundamental understanding of the mechanics of multiscale materials, ranging from multifunctional lattices to nanocomposites, and its application to the design of unconventional materials and structures. This Special Issue intends to publish original research papers and review articles addressing innovative theoretical approaches and novel numerical proposals aimed at amending the current state of the art on size-dependent modeling of nanomaterials and -structures. Authors are invited to submit both theoretical and experimental contributions.
Potential topics include but are not limited to the following:
- Nanosized and nanostructured materials;
- Periodic lattices and multiscale composites;
- Preparation, characterization, and application of nanomaterials;
- Nanocomposites, nanosystems, and nanodevices;
- Nonlinear lattices, hierarchical lattices;
- Nonlocal and generalized continua;
- Experimental and computational techniques in nanoscience;
- Design of ultralight structures and seismic devices for smart buildings.
Prof. Dr. Raffaele Barretta
Prof. Dr. Domenico De Tommasi
Prof. Dr. Fernando Fraternali
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access monthly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
- tensegrity structures
- multifunctional lattices
- carbon nanotubes
- size effects
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Design and testing of bistable lattices with nanoscale features fabricated by multiphoton lithography
Authors: Zacharias Vangelatos 1, Andrea Micheletti 2, Costas Grigoropoulos 1,*, and Fernando Fraternali 3
Affiliation: 1 Department of Mechanical Engineering, University of California, Berkeley, CA, USA; [email protected], [email protected] 2 Department of Civil and Computer Science Engineering, University of Rome Tor Vergata, Italy; [email protected] 3 Department of Civil Engineering, University of Salerno, Italy; [email protected] * Correspondence: [email protected]; Tel.: +1-510-642-2525
Abstract: Bistable response is a peculiar feature of tensegrity metamaterials, which is not easily found in other lattice metamaterials. It reflects into unconventional mechanical behaviors both in statics and dynamics. This paper explores the design, modeling, fabrication and testing of bistable lattices with tensegrity architecture and nanoscale features. First, a method to design bistable lattices starting from mono-stable tensegrity structures is formulated. Such a process leads to the design of lattices based on triangular tensegrity prism units with bistable response. The additive manufacturing of these structures is performed through multiphoton lithography, which enables the fabrication of microscale structures with nanoscale features and extremely high resolution. Different modular lattices are fabricated with 250 nm strut radius and subsequently tested under loading-unloading uniaxial compression cycles. Compression test results confirm the activation of the bistable twisting mechanism in the examined lattices, combined with a moderate viscoelastic response. The force-displacement plots of 3D assemblies of bistable tensegrity prisms reveal a softening behavior during loading form the first stable configuration, up to a snapping event that drives the structure into a second stable configuration. The twisting mechanism that characterizes such a transition is preserved after unloading and during repeated loading-unloading cycles. The results of the present study demonstrate that fabrication of multistable tensegrity lattices is highly feasible via multiphoton lithography, and pave the way to the fabrication of multi-cell tensegrity metamaterials with unconventional static and dynamic responses.
Title: A tensegrity model of the spider dragline silk that paves the way to the design of next-generation biomimetic fibres
Authors: Fernando Fraternali1, Nicola Stehling2, Ada Amendola1, Chris Holland2, Cornelia Rodenburg 2,*
Affiliation: 1 Department of Civil Engineering, University of Salerno (Italy); [email protected], [email protected] 2 Department of Materials Science & Engineering, University of Sheffield (UK); [email protected] * Correspondence: [email protected];
Abstract: This work presents a tensegrity modelling of the spider silk that captures the microstructural characterization of the Nephila dragline silk through plasma etching and low-voltage scanning electron microscopy. The proposed model reproduces the region-dependent hierarchical organization of the spider dragline silk in microfibrils, which are formed by crystalline granules of -sheet crystals (crystalline domains) linked each other by polypeptide (amorphous) tendons (noncrystalline domains). The crystalline granules endow the fibrils with transverse stiffness and produce transverse contraction under longitudinal stretching (Poisson’s effect). The variability of the regional properties of the fibrils across the radial depth explains the enhanced toughness and energy absorption capacity of the spider silk. The proposed modelling paves the way to the optimal design of novel biomimetic fibres with unprecedented mechanical properties. Keywords: spider silk; scanning electron microscopy; mechanical modelling; tensegrity systems; biomimetic fibres.
Title: Optimal Shapes and Junctions of Spider Webs: from Nanostructure to Macro Response
Authors: D. De Tommasi1, G. Puglisi1, N.M. Pugno2
Affiliation: 1 Dipartimento di Scienze dell’Ingegneria Civile e dell’Architettura, Politecnico di Bari, Bari, Italy; [email protected]; [email protected] 2 Laboratory of Bio-Inspired and Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento; Ket Lab, Edoardo Amaldi Foundation, Italian Space Agency; School of Engineering and Materials Science, Queen Mary University of London, U.K.; [email protected]
Abstract: Spider silks represent biological materials with incredible dissipative, strength and healing properties that descend from their complex nanostructure. The recent progress in the experimental techniques revealed that these extraordinary properties result by a ‘smart’ combination of materials, junctions and web geometric properties. These aspects are of great interest not only from an evolutionary and biological point of view, but also in the perspective of the design of innovative bioinspired materials and structures. Here, based on a multiscale model that we previously proposed, relating the macro response of the silk wires to their nanostructure, we analyze some important optimality properties of spider webs, taking care also of the fundamental role of silk junctions.
Title: Nonlocal thermo-viscoelastic responses analysis of viscoelastic laminated sandwich nanocomposites under non-uniform temperature
Authors: Huili Guoa, Tianhu Heb, Chenlin Li a,c
Affiliations: a School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China
b School of Science, Lanzhou University of Technology, Lanzhou 730050, Gansu, P.R. China;
c State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, P. R. China
Abstract: Viscoelastic laminated sandwich nanocomposite structure stands as a new class of smart nano-structure which is widely used as high-efficient shock absorbers in nanoengineering due to its excellent performance in vibration isolation and control. Especially under extreme non-isothermal conditions (e.g., high heat-flux, drastic change of temperature, etc.), how to improve the heat isolation and avoid unwanted vibrations appears to be particularly important for its safety working, and therefore a thorough and comprehensive study on such problems imperatively needed. This work aims to investigate the nonlocal thermo-viscoelastic responses of viscoelastic laminated sandwich nanocomposites under non-uniform temperature. It is assumed that the structure considered is subjected to symmetrical thermal loadings at its upper and lower bounding surfaces. The thermal contact resistance and elastic wave impedance at the interface are assumed to be zero with ideal adhesion. For each homogeneous isotropic layer, the governing equations are the first to be systematically formulated and solved by Laplace transformation techniques. The effects of size-dependent characteristic lengths and material constants ratio on structural responses are also evaluated and discussed. The strategy adopted in this work is expected to provide new insights on the vibration control and thermal management of viscoelastic laminated sandwich nanocomposites.
Title: Failure analysis of ultra high-performance fiber-reinforced concrete structures enhanced with nanomaterials by using a diffuse cohesive interface approach
Authors: Umberto De Maio1, Nicholas Fantuzzi2, Fabrizio Greco1*, Lorenzo Leonetti1, Andrea Pranno1
Affiliation: 1 Department of Civil Engineering, University of Calabria, Rende, 87036, Italy 2 Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Bologna, 40136, Italy
Abstract: Recent progresses in nanotechnology have clearly shown that the incorporation of nanomaterials within concrete elements leads to a sensible increase in strength and toughness, especially if used in combination with randomly distributed short fiber reinforcements, as for ultra high-performance fiber-reinforced concrete (UHPFRC). Current damage models often are not able to accurately predict the development of diffuse micro/macro-crack patterns which are typical for such concrete structures. In this work, a diffuse cohesive interface approach is proposed to predict the structural response of UHPFRC structures enhanced with embedded nanomaterials. According to this approach, all the internal mesh boundaries are regarded as potential crack segments, modeled as cohesive interfaces equipped with a mixed-mode traction-separation law suitably calibrated to account for the toughening effect of nano-reinforcements. The proposed fracture model has been firstly validated by comparing the failure simulation results of UHPFRC specimens containing different fractions of graphite nanoplatelets with the available experimental data. Subsequently, such a model, combined with an embedded truss model to simulate the concrete/steel rebars interaction, has been used for predicting the load-carrying capacity of steel-bar reinforced UHPFRC elements enhanced with nanoplatelets. The numerical outcomes have shown the reliability of the proposed model, also highlighting the role of the nanoreinforcement in the crack width control.
Title: Nanocapsules Rotating under Shear in A Yasuda-Carreau Non-Newtonian Fluid
Authors: A. COCLITE1*, G. M. COCLITE2, D. DE TOMMASI3
Affiliation: 1. Scuola di Ingegneria, Università degli Studi della Basilicata, Potenza, Italy. 2. Dipartimento di Meccanica, Matematica e Management, Bari, Italy. 3. Dipartimento dell’Ingegneria e dell’Architettura, Bari, Italy.
Abstract: Micro- and nano-particles have been proven as efficient carriers of therapeutics for the specific treatment of diseases such as cancer or cardiovascular disorders. For the target specific delivery of drugs, two major steps are required: the accumulation of these small constructs into capillary peripheries (margination) and the firm adhesion to the diseased tissue capillary walls. Specifically, soft nanomedicines should release their cargo mostly when firmly adhering such walls. In order to rationally design such carriers shape, is fundamental to understand their rotational behavior in non-Newtonian fluid so as to tailor their shape and let them be as prone as possible to marginate and stick diseased vascular walls. In this work a multi relaxation time Lattice Boltzmann method is used to describe the evolution of a non-Newtonian fluid. Such method is coupled with an Immersed-Boundary technique for the transport of arbitrarily shaped objects navigating the flow. In order to enforce the no-slip boundary conditions on immersed bodies a convenient forcing term is added to the discrete Boltzmann’s equation accounting for the hydrodynamic force generated by the presence immersed geometries. Moreover, such forcing term accounts also for the force induced by the shear-dependent viscosity characterizing the non-Newtonian behaviour of the fluid.
Title: Nanocrystalline Soft Magnetic Materials from Liquid State to Ready Product
Authors: Vladimir S. Tsepelev 1,*, Yuri N. Starodubtsev 1,2
Affiliation: 1 Ural Federal University, Research Center for Physics of Metal Liquids, Mira str.19, Ekaterinburg, 620002, Russia; [email protected] 2 Gammamet Research and Production Enterprise, Tatishchev str. 92, Ekaterinburg, 620028, Russia; [email protected]
Abstract: The place of nanocrystalline soft magnetic materials among other magnetic materials and methods of production. Physical principles of obtaining high permeability in nanocrystalline materials. The structure of liquid multicomponent alloys and its effect on magnetic properties. Nanocrystallization process and structure of nanocrystalline materials. Nanograin growth inhibitors. The influence of chemical composition on the structure and magnetic properties of nanocrystalline materials. Nanocrystalline soft magnetic materials with high magnetic flux density. Heat treatment in a magnetic field and thermal stability of nanocrystalline materials. Magnetic hysteresis, frequency dependences of core losses and permeability. Dependence of core losses on the amplitude of induction. Magnetic cores, transformers and inductive elements made of nanocrystalline materials and their application.