Article
Polymer Science
Mohammed Houssat, Christina Villeneuve-Faure, Nadine Lahoud Dignat, Marie-Laure Locatelli, Jean-Pascal Cambronne
Summary: The interphase region significantly affects the dielectric properties of nanocomposites, especially at higher temperatures. Multiscale characterization reveals a correlation between interphase width and temperature. Additionally, a strong relationship is observed between interphase dielectric permittivity and NC breakdown strength.
Article
Polymer Science
Farzad Ebrahimi, Alireza Enferadi, Ali Dabbagh
Summary: This paper investigates the wave propagation in multi-scale hybrid glass fiber (GF)/carbon nanotube (CNT)/polymer nanocomposite plates using refined higher-order plate theory. The study employs a hierarchical micromechanical approach to predict the effective mechanical properties of the hybrid nanocomposite and implements a refined-type higher-order shear deformation theory (HSDT) to consider the influence of shear deformation on the motion equations. The derived equations are solved analytically to extract the natural frequency of the continuous system. Numerical examples demonstrate that the hybrid nanocomposite system achieves higher wave frequencies and that the lay-ups and length-to-diameter ratio significantly affect the acoustic response of the sandwich plate.
Article
Engineering, Mechanical
Mohammad Noroozi, Asghar Zajkani, Majid Ghadiri
Summary: This paper investigates the dynamic elastoplastic response of carbon nanotube fiber/polymer multiscale laminated composite doubly curved shell subjected to low-velocity impact. The study involves calculating effective material properties, obtaining elastoplastic constitutive equations, and developing an elastoplastic contact model. Numerical results show stress occurring in the shell even away from the contact area in low velocity impact analysis.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Jie Zhi, Karh Heng Leong, Kirk Ming Yeoh, Tong -Earn Tay, Vincent Beng Chye Tan
Summary: A multiscale method is proposed in this study to model thin-walled fiber reinforced composite laminates using Mindlin-Reissner shell theory and Direct FE2. The method employs a first-order homogenization framework to handle the scale transitions and considers in-plane and through-thickness periodicity. It avoids the upscaling of macroscopic stresses and tangents in the conventional nested FE2 scheme, making it useful for modeling damage propagation in composite structures.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Chemistry, Physical
Yunhe Sheng, Chao Li, Jie Wang, Xiaodong Xia, George J. Weng, Yu Su
Summary: In this study, a multiscale model was developed based on effective medium theory to predict the effect of carbon nanotube (CNT) agglomeration on the overall thermal conductivity of CNT-polymer nanocomposites. It was found that the existence of CNT agglomerates can cause a decrease of up to 50% in the overall thermal conductivity of the nanocomposite. Two important parameters for the progressive agglomeration model were identified and their influences on the predicted results were examined.
Article
Mechanics
Gabrijela Grozdanic, Adnan Ibrahimbegovic, Mirela Galic, Vladimir Divic
Summary: This paper presents a novel numerical model for simulating the fracture behavior of laminated glass structures. The model combines fine-scale and coarse-scale approaches to achieve high computational efficiency and accuracy. The conducted experiments and comparisons demonstrate the effectiveness of the proposed model in predicting fracture behavior.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Polymer Science
Mingxuan Lu, Jianshan Liao, Prabhakar V. Gulgunje, Huibin Chang, Pedro J. Arias-Monje, Jyotsna Ramachandran, Victor Breedveld, Satish Kumar
Summary: Rheological behavior of PAN/CNT dispersions with high CNT loading and their fiber spinning properties were studied, as well as compared to PAN/CNC dispersions. The results showed similarities in rheological behavior and fiber spinning performance between PAN/CNC and PAN/CNT at high filler loading.
Article
Mechanics
Hyunseong Shin
Summary: A multiscale model is proposed to predict the fracture toughness of CNT/epoxy nanocomposites, reflecting experimentally observed toughening mechanisms and showing satisfactory agreement with experimental data. The study compares the contributions of each toughening mechanism and aims to reveal the complex nature of fracture toughness of CNT/epoxy nanocomposites while providing efficient and satisfactory predictions.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Jamshid Fazilati, Vahid Khalafi, Meisam Jalalvand
Summary: This paper introduces a numerical model for predicting the properties of tow-steered three-phase CNT/polymer/fiber composition. Several homogenization techniques are used to evaluate the overall properties of the laminate. Parametric studies are conducted to investigate the effects of problem variables on the free vibration behavior.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Civil
Jamshid Fazilati, Vahid Khalafi, Meisam Jalalvand
Summary: This paper introduces a numerical model for predicting the properties of a tow-steered three-phase CNT/polymer/fiber composition, addressing the free vibration of laminated quadrilateral plates. The behavior of the matrix reinforced with the carbon-nanotube additive is calculated based on micromechanics approach, considering possible agglomerated CNT phases. Homogenization techniques are presented in detail to evaluate the overall properties of the laminate, with parametric studies investigating the effects of problem variables on the free vibration behavior.
THIN-WALLED STRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Nand Jee Kanu, Achchhe Lal
Summary: This study investigates the mechanically and thermo-initiated nonlinear static and dynamic assessment of the bending response of single-walled carbon nanotubes' (CNTs') fibers with a nanoclay particle reinforced polymer hybrid laminated composite plate under static and dynamic loading. The study explores the effects of various factors on the transverse central deflection response of the laminated hybrid plate.
Article
Mechanics
M. S. H. Al-Furjan, Mostafa Habibi, Dong Won Jung, Hamed Safarpour, Mehran Safarpour
Summary: This article presents the axial buckling analysis of a polymer-CNT-fiber nanocomposite annular system resting on Winkler-Pasternak substrates under various temperature gradients. The governing equations are derived using Hamilton's principle and the higher-order shear deformation theory, and a generalized differential quadrature method is employed for an accurate solution. The results show that parameters such as the outer to inner radius ratio, temperature increase patterns, volume fraction and orientation angle of carbon fibers, weight fraction and distribution patterns of carbon-nanotubes, and other geometric and physical parameters play an important role in the axial buckling load of the structure.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Chemistry, Analytical
Rino Nishimoto, Yuichi Sato, Jingxuan Wu, Tomoki Saizaki, Mahiro Kubo, Mengyun Wang, Hiroya Abe, Ines Richard, Tatsuo Yoshinobu, Fabien Sorin, Yuanyuan Guo
Summary: Bioelectronic devices are evolving from rigid to flexible materials, and thermally-drawn-fiber-based bioelectronics show promise due to their flexibility and integration of multi-functionalities. This study designed and fabricated microelectrode fibers made of carbon nanotube-based hybrid nanocomposites for electrochemical sensing. The fibers exhibited high sensitivity and long-term stability. In the future, multiple modalities can be integrated into a single fiber for various biological applications and health monitoring.
Article
Mechanics
Yifu Lu, Liyong Tong
Summary: This paper presents a concurrent optimization method for laminated composite structures, which optimizes structural topology and anisotropic materials simultaneously by optimizing laminate topology and fiber orientations. The method can achieve both constant-stiffness and variable-stiffness designs.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Shrutidhara Sarma, Surinder Singh, A. Garg
Summary: An Ag-Carbon nanotube (CNT) nanocomposite film was developed as the sensing element of a thin film sensor (TFS) in this study, showing better sensitivity compared to pure Ag TFS. Static calibration revealed a better temperature coefficient for the nanocomposite TFS, indicating improved sensitivity.
Article
Mechanics
Shakiba Zolfaghari, Davood Mostofinejad, Nicholas Fantuzzi, Raimondo Luciano, Francesco Fabbrocino
Summary: In this study, the effect of groove width and depth variation on the FRP-concrete bond performance was investigated. The results showed that the grooving method increased the bond strength compared to the externally-bonded reinforcement method. The optimal groove dimensions for retrofitting were determined to be 10 x 5 mm (width x depth) with a 73.5% increase in load-carrying capacity compared to the EBR specimens.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Francesco Tornabene, Matteo Viscoti, Rossana Dimitri, Luciano Rosati
Summary: In this study, a general formulation is proposed to consider general boundary conditions for the dynamic analysis of anisotropic laminated doubly-curved shells. A mapping procedure based on Non-Uniform Rational Basis Spline (NURBS) curves is used to describe the distortion of the physical domain. Mode frequencies and shapes are determined using higher-order theories within an Equivalent Single Layer (ESL) framework. The dynamic problem is solved numerically using the Generalized Differential Quadrature (GDQ) method.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Mehdi Alimoradzadeh, Francesco Tornabene, Sattar Mohammadi Esfarjani, Rossana Dimitri
Summary: This paper investigates the nonlinear free vibration, superharmonic and subharmonic resonance response of homogeneous Euler-Bernoulli beams resting on nonlinear viscoelastic foundations, considering a moving mass and an abrupt uniform temperature rise. The nonlinear differential equation of motion, derived from the Hamiltonian principle and Finite Strain Theory, is discretized using the Galerkin decomposition method and solved using a multiple time scale method. A comparison between the Finite Strain theory and the Von-Karman approach is discussed, taking into account the effect of temperature rise, linear and nonlinear coefficients of the elastic foundation on the nonlinear vibration history and phase trajectory. Additionally, the sensitivity of the frequency response of the system in superharmonic and subharmonic resonance for different input parameters, such as the location, velocity, and magnitude of the moving load, temperature rise, and elastic foundation, is examined.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Mechanics
Anis Mohabeddine, Ghassan Malik, Jose Correia, Filipe Silva, Abilio De Jesus, Nicholas Fantuzzi, Jose Miguel Castro
Summary: This paper presents a comprehensive study on the behavior of CFRP/steel adhesively bonded double strap joints. 50 specimens were tested under static tensile loading, and digital image correlation was used to measure the deformation. The study analyzed six different adhesives and considered various influencing parameters such as adhesive type, thickness, CFRP properties, surface treatment, and steel thickness. The results showed that tough adhesives with high strength and ductility perform better for strengthening metallic infrastructures than rigid adhesives commonly used in the construction industry. The study also developed a validated numerical model in ABAQUS and discussed the experimental observations using the model.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Francesco Tornabene, Matteo Viscoti, Rossana Dimitri
Summary: In this study, an Equivalent Single Layer (ESL) formulation is proposed for the static analysis of doubly curved anisotropic structures of arbitrary geometry and variable stiffness on a Winkler elastic foundation. The proposed formulation provides in-plane and out-of-plane general distributions of linear elastic springs for external constraints along the edges. The use of higher order theories and the Generalized Differential Quadrature (GDQ) method allows for accurate results with reduced computational cost compared to finite element simulations.
COMPOSITE STRUCTURES
(2023)
Article
Thermodynamics
Mohamed-Ouejdi Belarbi, Sattar Jedari Salami, Aman Garg, Ahmed-Amine Daikh, Mohamed-Sid-Ahmed Houari, Rossana Dimitri, Francesco Tornabene
Summary: This paper presents a hyperbolic shear deformation theory for investigating the bending and buckling behavior of functionally graded carbon nanotubes-reinforced composite (FG-CNTRC) beams. The theory satisfies the parabolic variation of shear stress distribution and eliminates the need for correction factors. Finite element analysis is conducted considering different CNT reinforcement distributions and power-law function variations. The proposed model demonstrates accuracy, fast convergence, numerical stability, and validity for both symmetric and non-symmetric FG-CNTRC beams. The study also explores the effects of various material and geometric parameters on the beam's response.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Engineering, Civil
Tian-Wei Liu, Jiang-Bo Bai, Shao-Lin Li, Nicholas Fantuzzi
Summary: The research evaluates the tensile behavior and functional mechanisms of a new corrugated flexible composite skin using analytical, experimental, and numerical simulation methods. Geometric parameters are found to be an important factor affecting the tensile behavior of the composite skin.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Michele Bacciocchi, Nicholas Fantuzzi
Summary: The article presents a finite element mapping procedure for computing the fundamental matrices of laminated thin plates with arbitrary domains in gradient elasticity. The approximate solution uses Hermite interpolating functions and requires conforming and nonconforming formulations for membrane and bending degrees of freedom. The accuracy and convergence features of the methodology are demonstrated through numerical tests and compared to relevant literature.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Mechanical
R. Vescovini, N. Fantuzzi
Summary: This article presents a formulation for studying the free vibrations of open and closed conical shells efficiently. It allows for various boundary conditions and stiffness enhancements. The resulting models have few degrees of freedom, reducing computational effort, and do not require meshing.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
M. Alimoradzadeh, Habib Heidari, F. Tornabene, R. Dimitri
Summary: This study investigates the nonlinear dynamic behavior of microscale CNTR composite Euler-Bernoulli beams with a non-uniform cross-section using a modified couple stress theory. The nonlinear PDEs of motion are established based on the Von-Karman nonlinear strain-displacement relationship and Hamiltonian principle. The effects of boundary conditions and reinforcement parameters on the nonlinear response of CNTR composite beams are analyzed using numerical simulations, providing insights for further computational investigations.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Engineering, Mechanical
M. Avey, F. Kadioglu, S. Ahmetolan, N. Fantuzzi
Summary: In this study, the first-order shear deformation plate theory (FOPT) proposed by Ambartsumyan is extended to heterogeneous laminated nanocomposite plates and the nonlinear vibration problem. An elastic medium is considered for the first time, using the Pasternak-type elastic foundation model (PT-EF). The mathematical models of laminated rectangular plates with CNT originating layers on the PT-EF are created, and the large amplitude stress-strain relationships and motion equations are derived within FOPT. By applying Galerkin's method, the derived equations are reduced to a nonlinear ordinary differential equation (NL-ODE) for laminated rectangular plates composed of nanocomposite layers. The NL-ODE is solved by the semi-inverse method, and the nonlinear frequency-amplitude relationship is established for the laminated plates resting on the PT-EF within FOPT for the first time. From these relations, similar relations for unconstrained laminated and monolayer CNT patterns plates can be obtained.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Mechanics
Mohsen Taghizadeh, Masoud Babaei, Rossana Dimitri, Francesco Tornabene
Summary: The buckling behavior of bi-directional functionally graded conical micro-shells subjected to axial loading is investigated in this study, utilizing the modified couple stress theory (MCST) based on the theory of first-order shear deformation. The Ritz technique is employed to solve the governing equations. The micro-shells are constructed using bi-directional functionally graded material, with volume fractions of constituent materials varying continuously along the conical edge directions and thickness according to a predefined composition profile. The model predictions are successfully validated against literature results. The study also examines the influence of various geometrical and mechanical parameters on the buckling performance of conical micro-shells, such as the radius-to-thickness ratio, thickness-to-length scale ratio, length-to-radius ratio, semi-vertex angle, homogenization schemes, and material gradient indexes. It is noteworthy that this investigation presents the first buckling analysis of bi-directional functionally graded truncated conical micro-shells in accordance with the MCST.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Editorial Material
Materials Science, Composites
Nicholas Fantuzzi
COMPOSITES PART C: OPEN ACCESS
(2023)
Article
Engineering, Multidisciplinary
Francesco Tornabene, Matteo Viscoti, Rossana Dimitri
Summary: This study investigates the dynamic behavior of laminated anisotropic doubly-curved shells with a generalized distribution of the material orientation angle using higher order theories. The equivalent single layer methodology is used to develop the structural problem and establish a unified approach for evaluating displacement field variables with higher order theories. A generalized three-dimensional distribution of the material orientation angle is associated with each layer of the stacking sequence, accounting for in-plane bivariate power distribution and out-of-plane symmetric and unsymmetric profiles described with polynomial and non-polynomial analytical expressions. The fundamental equations are derived using the Hamiltonian Principle and numerically solved using the Generalized Differential Quadrature method.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Multidisciplinary
Francesco Tornabene, Matteo Viscoti, Rossana Dimitri
Summary: This manuscript investigates the dynamic properties of doubly-curved shell structures laminated with innovative materials using the Generalized Differential Quadrature (GDQ) method. The displacement field variable follows the Equivalent Single Layer (ESL) approach, and the geometrical description of the structures is distorted by generalized isogeometric blending functions. Through non-uniform discrete computational grid, the fundamental equations derived from the Hamiltonian principle are solved in strong form. Parametric investigations show the influence of material property variation on the modal response of the structures.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
