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  1. Book ; Online: Mesh-Free and Finite Element-Based Methods for Structural Mechanics Applications

    Fantuzzi, Nicholas

    2021  

    Keywords History of engineering & technology ; direction field ; tensor line ; principal stress ; tailored fiber placement ; heat conduction ; finite elements ; space-time ; elastodynamics ; mesh adaptation ; non-circular deep tunnel ; complex variables ; conformal mapping ; elasticity ; numerical simulation ; numerical modeling ; joint static strength ; finite element method ; parametric investigation ; reinforced joint (collar and doubler plate) ; nonlocal elasticity theory ; Galerkin weighted residual FEM ; silicon carbide nanowire ; silver nanowire ; gold nanowire ; biostructure ; rostrum ; paddlefish ; Polyodon spathula ; maximum-flow/minimum-cut ; stress patterns ; finite element modelling ; laminated composite plates ; non-uniform mechanical properties ; panel method ; marine propeller ; noise ; FW-H equations ; experimental test ; continuation methods ; bifurcations ; limit points ; cohesive elements ; functionally graded materials ; porosity distributions ; first-order shear deformation theory ; shear correction factor ; higher-order shear deformation theory ; equivalent single-layer approach ; n/a
    Size 1 electronic resource (220 pages)
    Publisher MDPI - Multidisciplinary Digital Publishing Institute
    Publishing place Basel, Switzerland
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT021044005
    ISBN 9783036501376 ; 3036501371
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Book ; Online: Feature Papers in Mathematical and Computational Applications

    Rozza, Gianluigi / Schütze, Oliver / Fantuzzi, Nicholas

    2023  

    Keywords Research & information: general ; Mathematics & science ; physics simulations ; neural networks ; electronic design ; heat equation ; error function ; function approximation ; spline approximation ; Gaussian function ; stochastic neural networks ; cell tracking ; microscopy image analysis ; detection-and-association methods ; image segmentation ; a priori segmentation ; level set method ; geodesic active contour ; computer simulation ; cardiovascular system ; parameterization ; validation ; animal model ; finite element method ; p-version ; harmonic extensions ; functional interpolation ; ordinary differential equations ; numerical methods ; microplastics ; Lotka-Volterra ; predator ; prey ; predator-prey ; pollution ; bioaccumulation ; biomagnification ; predation ; two-species model ; matrix sequences ; spectral analysis ; finite element approximations ; Darcy-Forchheimer model ; thermal radiation ; finite difference technique ; viscous dissipation ; Soret and Dufour impacts ; chemical reaction ; entropy generation ; agglomerated cork ; material modeling ; successive linear approximation ; finite element ; n/a
    Language English
    Size 1 electronic resource (240 pages)
    Publisher MDPI - Multidisciplinary Digital Publishing Institute
    Publishing place Basel
    Document type Book ; Online
    Note English
    HBZ-ID HT030722342
    ISBN 9783036567570 ; 3036567577
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  3. Article: Stability Analysis of Shear Deformable Inhomogeneous Nanocomposite Cylindrical Shells under Hydrostatic Pressure in Thermal Environment.

    Sofiyev, Abdullah H / Fantuzzi, Nicholas

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 13

    Abstract: In this study, the stability of inhomogeneous nanocomposite cylindrical shells (INCCSs) under hydrostatic pressure in a thermal environment is presented. The effective material properties of the inhomogeneous nanocomposite cylindrical shell are modeled ... ...

    Abstract In this study, the stability of inhomogeneous nanocomposite cylindrical shells (INCCSs) under hydrostatic pressure in a thermal environment is presented. The effective material properties of the inhomogeneous nanocomposite cylindrical shell are modeled on the basis of the extended mixture rule. Based on the effective material properties, the fundamental relations and stability equations are derived for thermal environments. In this process, the first-order shear deformation theory (FSDT) for the homogeneous orthotropic shell is generalized to the inhomogeneous shell theory. This is accomplished using the modified Donnell-type shell theory. The analytical expressions are obtained for hydrostatic buckling pressure of INCCSs in the framework of FSDT and classical shell theory (CST) by obtaining a solution based on Galerkin's procedure. The numerical examples presented include both comparisons and original results. The last section shows the influences of carbon nanotube (CNT) models, volume fraction, and shell characteristics on the hydrostatic buckling pressure in the thermal environment.
    Language English
    Publishing date 2023-07-07
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16134887
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: A Study on the Effect of Doping Metallic Nanoparticles on Fracture Properties of Polylactic Acid Nanofibres via Molecular Dynamics Simulation.

    Izadi, Razie / Trovalusci, Patrizia / Fantuzzi, Nicholas

    Nanomaterials (Basel, Switzerland)

    2023  Volume 13, Issue 6

    Abstract: All-atom molecular dynamics simulations are conducted to elucidate the fracture mechanism of polylactic acid nanofibres doped with metallic nanoparticles. Extensional deformation is applied on polymer nanofibres decorated with spherical silver ... ...

    Abstract All-atom molecular dynamics simulations are conducted to elucidate the fracture mechanism of polylactic acid nanofibres doped with metallic nanoparticles. Extensional deformation is applied on polymer nanofibres decorated with spherical silver nanoparticles on the surface layer. In the obtained stress-strain curve, the elastic, yield, strain softening and fracture regions are recognized, where mechanical parameters are evaluated by tracking the stress, strain energy and geometrical evolutions. The energy release rate during crack propagation, which is a crucial factor in fracture mechanics, is calculated. The results show that the presence of doping nanoparticles improves the fracture properties of the polymer nanofibre consistently with experimental observation. The nanoparticles bind together polymer chains on the surface layer, which hinders crack initiation and propagation. The effect of the distribution of nanoparticles is studied through different doping decorations. Additionally, a discussion on the variation of internal energy components during uniaxial tensile loading is provided to unravel the deformation mechanism of nanoparticle-doped nanofibres.
    Language English
    Publishing date 2023-03-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano13060989
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Dynamic Characterization of Hexagonal Microstructured Materials with Voids from Discrete and Continuum Models.

    Colatosti, Marco / Shi, Farui / Fantuzzi, Nicholas / Trovalusci, Patrizia

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 21

    Abstract: The mechanical response of materials such as fiber and particle composites, rocks, concrete, and granular materials, can be profoundly influenced by the existence of voids. The aim of the present work is to study the dynamic behavior of hexagonal ... ...

    Abstract The mechanical response of materials such as fiber and particle composites, rocks, concrete, and granular materials, can be profoundly influenced by the existence of voids. The aim of the present work is to study the dynamic behavior of hexagonal microstructured composites with voids by using a discrete model and homogenizing materials, such as micropolar and classical Cauchy continua. Three kinds of hexagonal microstructures, named regular, hourglass, and skew, are considered with different length scales. The analysis of free vibration of a panel described as a discrete system, as a classical and as a micropolar continuum, and the comparison of results in terms of natural frequencies and modes show the advantage of the micropolar continuum in describing dynamic characteristics of orthotropic composites (i.e., regular and hourglass microstructures) with respect to the Cauchy continuum, which gives a higher error in frequency evaluations for all three hexagonal microstructured materials. Moreover, the micropolar model also satisfactorily predicts the behavior of skewed microstructured composites. Another advantage shown here by the micropolar continuum is that, like the discrete model, this continuum is able to present the scale effect of microstructures, while maintaining all the advantages of the field description. The effect of void size is also investigated and the results show that the first six frequencies of the current problem decrease by increasing in void size.
    Language English
    Publishing date 2022-10-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15217524
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: On the Solution of Thermal Buckling Problem of Moderately Thick Laminated Conical Shells Containing Carbon Nanotube Originating Layers.

    Avey, Mahmure / Fantuzzi, Nicholas / Sofiyev, Abdullah

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 21

    Abstract: This study presents the solution for the thermal buckling problem of moderately thick laminated conical shells consisting of carbon nanotube (CNT) originating layers. It is assumed that the laminated truncated-conical shell is subjected to uniform ... ...

    Abstract This study presents the solution for the thermal buckling problem of moderately thick laminated conical shells consisting of carbon nanotube (CNT) originating layers. It is assumed that the laminated truncated-conical shell is subjected to uniform temperature rise. The Donnell-type shell theory is used to derive the governing equations, and the Galerkin method is used to find the expression for the buckling temperature in the framework of shear deformation theories (STs). Different transverse shear stress functions, such as the parabolic transverse shear stress (Par-TSS), cosine-hyperbolic shear stress (Cos-Hyp-TSS), and uniform shear stress (U-TSS) functions are used in the analysis part. After validation of the formulation with respect to the existing literature, several parametric studies are carried out to investigate the influences of CNT patterns, number and arrangement of the layers on the uniform buckling temperature (UBT) using various transverse shear stress functions, and classical shell theory (CT).
    Language English
    Publishing date 2022-10-23
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15217427
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Book ; Online: Analytical model for predicting folding stable state of bistable deployable composite boom

    Liu, Tian-Wei / Bai, Jiang-Bo / Fantuzzi, Nicholas

    2023  

    Abstract: The bistable deployable composite boom (Bi-DCB) can achieve bistable function by storing and releasing strain energy, which has a good application prospect in space field. For example, it serves as the main support section of deployable structures (e.g., ...

    Abstract The bistable deployable composite boom (Bi-DCB) can achieve bistable function by storing and releasing strain energy, which has a good application prospect in space field. For example, it serves as the main support section of deployable structures (e.g., solar arrays and antennas). This paper investigates the folding stable state of the Bi-DCB through the analytical method. Based on the classical Archimedes' helix, the geometrical model of the Bi-DCB was established. Using energy principle, an analytical model for predicting the folding stable state of the Bi-DCB was presented. The failure indices of six Bi-DCBs in the folding stable state were calculated using the Tsai-Hill criterion and the maximum stress criterion. To validate the analytical model proposed in this paper, the prediction results were compared with the results of two Finite Element Models (FEMs) and experimental results, and the four were in good agreement. Finally, the effect of geometric parameters (i.e., radius of cross-section, thickness and length) on the folding stable state of the Bi-DCB was further investigated with the aid of the analytical model. It is shown that geometric parameters are one of the key factors affecting the folding stable state of the Bi-DCB.

    Comment: arXiv admin note: substantial text overlap with arXiv:2305.05289
    Keywords Physics - Classical Physics
    Subject code 612
    Publishing date 2023-05-14
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  8. Article: Buckling Behavior of Sandwich Cylindrical Shells Covered by Functionally Graded Coatings with Clamped Boundary Conditions under Hydrostatic Pressure.

    Sofiyev, Abdullah H / Fantuzzi, Nicholas / Ipek, Cengiz / Tekin, Gülçin

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 23

    Abstract: The buckling behavior of sandwich shells with functionally graded (FG) coatings operating under different external pressures was generally investigated under simply supported boundary conditions. Since it is very difficult to determine the approximation ... ...

    Abstract The buckling behavior of sandwich shells with functionally graded (FG) coatings operating under different external pressures was generally investigated under simply supported boundary conditions. Since it is very difficult to determine the approximation functions satisfying clamped boundary conditions and to solve the basic equations analytically within the framework of first order shear deformation theory (FOST), the number of publications on this subject is very limited. An analytical solution to the buckling problem of FG-coated cylindrical shells under clamped boundary conditions subjected to uniform hydrostatic pressure within the FOST framework is presented for the first time. By mathematical modeling of the FG coatings, the constitutive relations and basic equations of sandwich cylindrical shells within the FOST framework are obtained. Analytical solutions of the basic equations in the framework of the Donnell shell theory, obtained using the Galerkin method, is carried out using new approximation functions that satisfy clamped boundary conditions. Finally, the influences of FG models and volume fractions on the hydrostatic buckling pressure within the FOST and classical shell theory (CT) frameworks are investigated in detail.
    Language English
    Publishing date 2022-12-05
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15238680
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Stress Field Evaluation in Orthotropic Microstructured Composites with Holes as Cosserat Continuum.

    Shi, Farui / Fantuzzi, Nicholas / Trovalusci, Patrizia / Li, Yong / Wei, Zuoan

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 18

    Abstract: It is known that the presence of microstructures in solids such as joints and interfaces has an essential influence on the studies of the development of advanced materials, rock mechanics, civil engineering, and so on. However, microstructures are often ... ...

    Abstract It is known that the presence of microstructures in solids such as joints and interfaces has an essential influence on the studies of the development of advanced materials, rock mechanics, civil engineering, and so on. However, microstructures are often neglected in the classical local (Cauchy) continuum model, resulting in inaccurate descriptions of the behavior of microstructured materials. In this work, in order to show the impact of microstructures, an implicit 'non-local' model, i.e., micropolar continuum (Cosserat), is used to numerically investigate the effects of direction and scale of microstructures on the tension problem of a composite plate with a circular hole. The results show that distributions of field variables (such as displacements and stresses) have an obvious directionality with respect to the microstructures' direction. As the scale of microstructures increases, such a direction effect becomes more evident. Unlike the isotropic material where stress concentration occurs at the vertex of the hole and the stress concentration factor is close to 3, for the microstructured composite, the stress concentration can be observed at any location depending on the microstructures' directions, and the concentration factor can exceed 3 to a maximum close to 9 as the increasing scale of microstructures. In addition, differences in the mechanical behavior between Cosserat and Cauchy models can be also observed; such differences are more evident for the material showing a pronounced orthotropic nature.
    Language English
    Publishing date 2022-09-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15186196
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Evaluating the X-ray-Shielding Performance of Graphene-Oxide-Coated Nanocomposite Fabric.

    Türkaslan, Serhat Süha / Ugur, Şule Sultan / Türkaslan, Banu Esencan / Fantuzzi, Nicholas

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 4

    Abstract: Exposure to ionizing radiation (IR) during diagnostic medical procedures brings certain risks, especially when experiencing recurrent exposures. The fabrication of nano-based composites, doped with different nanoparticles, have been suggested as ... ...

    Abstract Exposure to ionizing radiation (IR) during diagnostic medical procedures brings certain risks, especially when experiencing recurrent exposures. The fabrication of nano-based composites, doped with different nanoparticles, have been suggested as effective shielding materials to replace conventional lead-based ones in material sciences and nanotechnology. In this study, commercially available fabrics, used to produce scrubs and gowns for clinical staff, are modified utilizing graphene oxide (GO) nanoparticles using a layer-by-layer (LBL) technique. GO was obtained from graphite through environmentally friendly technology by using a modified-improved Hummers' method without NaNO
    Language English
    Publishing date 2022-02-15
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15041441
    Database MEDical Literature Analysis and Retrieval System OnLINE

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