Article
Mechanics
Emad Sobhani, Amir R. Masoodi, Amir Reza Ahmadi-Pari
Summary: In this paper, free vibration analysis of sandwich composite joined conical-cylindrical-conical shells is conducted using FSDT, reinforced with FG-CNTs and FG-GNPs. Different distribution patterns and boundary conditions are considered, with the GDQM method utilized to solve the PDE system. The correctness and efficiency of the proposed formulation are validated through comparison with reference solutions.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Yu-Qi Hao, Feng-Lian Li, Yi-Ping Wang, Yu-Xin Hao, Mei Lv
Summary: This paper investigates the free vibration and sound insulation characteristics of FG-CNTRC sandwich plates with FG-CNT face sheets and different cores. It discusses the effects of parameters such as CNT volume fraction, distribution patterns, orientation angles, porosity coefficient, and incident angles on the vibro-acoustic characteristics of the sandwich plate. The results provide valuable references for further research.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Materials Science, Multidisciplinary
Tripuresh Deb Singha, Tanmoy Bandyopadhyay, Amit Karmakar
Summary: Finite element analyses based on higher-order shear deformation theory (HSDT) are used to study low-velocity impact behavior of pre-twisted sandwich conical shell panels with functionally graded carbon nanotubes-reinforced composite (FG-CNTRC) facings. Material properties of FG-CNTRC facings are determined using micromechanical models, and the dynamic equilibrium equation is formulated using Lagrange's equation with modified Hertzian contact law. The impact response of FG-CNTRC sandwich conical shell panels is analyzed by considering various parameters.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
Ping Xiang, Qing Xia, L. Z. Jiang, Linxin Peng, J. W. Yan, Xiang Liu
Summary: In this study, the free vibration analysis of functionally graded carbon nanotube reinforced composite conical shell was carried out using the element-free kp-Ritz method. The material properties were determined by rule of mixtures and varied with thickness. The effects of various factors on the free vibration frequency characteristics were discussed in detail.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
M. Safarpour, A. Alibeigloo
Summary: This paper investigates the high-accuracy analysis of bending and frequency response of a sandwich cylindrical shell with functionally graded carbon nanotubes reinforced composite face-sheets and a polymeric core under various mechanical loading and initial axial stress conditions. The study presents analytical solutions and employs the state-space based differential quadrature method to determine the bending and frequency response of the structure, providing insights into the influences of parameters such as initial stress and mechanical loading. Results of the study can be used as benchmarks to evaluate the validity of the traditional two-dimensional theory.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2021)
Article
Mechanics
K. Foroutan, E. Carrera, H. Ahmadi
Summary: This article analyzes the nonlinear static and dynamic hygrothermal postbuckling response of sandwich cylindrical panels with functionally graded carbon nanotube-reinforced composite core using analytical and semi-analytical methods. The study considers different types of FG-CNTRC core and explores the influence of material parameters, geometric characteristics, and nonlinear viscoelastic foundation parameters on the postbuckling behavior of the panels. The results show that CNTs distribution types and nonlinear viscoelastic foundation parameters significantly affect the hygrothermal postbuckling behaviors of the panels.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
K. Foroutan, E. Carrera, H. Ahmadi
Summary: This paper investigates the nonlinear free vibration and nonlinear dynamic hygrothermal buckling behavior of imperfect functionally graded carbon nanotube-reinforced composite cylindrical panels under a hygrothermal environment. Various factors such as temperature, moisture, material parameters, etc. are considered in relation to their influence on the system behavior.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Engineering, Civil
Kamran Foroutan, Habib Ahmadi, Erasmo Carrera
Summary: This article presents an analytical approach for analyzing the free vibration behavior of a sandwich cylindrical shell with a functionally graded core, and examines the effects of different geometric and material parameters on its vibration behavior.
SMART STRUCTURES AND SYSTEMS
(2022)
Article
Mechanics
Hamzeh Akbari, Mohammad Azadi, Hamidreza Fahham
Summary: In this paper, a numerical solution is presented for the free vibration analysis of sandwich cylindrical panels with a saturated functionally graded porous core and two homogeneous face sheets. The effects of various parameters on the natural frequencies are examined through a parametric study.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Civil
M. M. Keleshteri, J. Jelovica
Summary: This study proposes a novel higher-order porosity distribution model and investigates the free vibration and buckling behavior of cylindrical sandwich panels to validate the accuracy and effectiveness of the model. The results show that the higher-order porosity distribution can significantly increase the buckling load and fundamental natural frequency of cylindrical sandwich panels.
ENGINEERING STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Tripuresh Deb Singha, Tanmoy Bandyopadhyay, Amit Karmakar
Summary: This paper presents a numerical solution based on the finite element method for the free vibration analysis of a rotating pre-twisted graphene reinforced composite cylindrical shell. The piece-wise distribution of graphene reinforced composite layers and temperature-dependent material properties are considered. The motion equation is formulated and various factors are evaluated for their effects on the vibration characteristics.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Xu-hao Huang, Jian Yang, Xing-er Wang, Iftikhar Azim
Summary: In this study, the dynamic behavior of functionally graded carbon nanotube-reinforced composite plates with negative Poisson's ratio (NPR) is investigated using higher-order shear deformation theory and large deflection theory. The effective Poisson's ratio (EPR) of the laminates is predicted using explicit solutions, and the maximum NPR is found for carbon nanotube-reinforced composite plates. Asymptotic solutions are derived using a two-step perturbation approach to capture the relationship between center deflection and time. Numerical simulations are carried out to analyze the effects of various factors on the dynamic behavior of the plates.
ENGINEERING WITH COMPUTERS
(2022)
Article
Mechanics
Yaser Heidari, Mohammad Arefi, Mohsen Irani-Rahaghi
Summary: This paper investigates the free vibration analysis of cylindrical micro/nano shell made from a mixture of ceramic/metal, reinforced with carbon-nanotube-reinforced (CNTRC) patches. The study focuses on the effect of attached CNTRC patches on the free vibration responses, highlighting the significant influence of parameters such as number and angle of patches, volume fraction, and geometric parameters.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2021)
Article
Mechanics
Mohammad Jafari Niasar, Ali Asghar Jafari, Mohsen Irani Rahaghi, Shahin Mohammadrezazadeh
Summary: This article investigates the active control of free and forced vibration of a rotating functionally graded cylindrical shell using FG piezoelectric patches. It extracts ordinary differential equations of the system through the energy method and Lagrange equation. The study validates the results by comparing them with previous studies and examines the convergence of vibration responses. The results show that changing piezoelectric properties in the form of a power law leads to a quicker decrease in vibration amplitude.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Mechanics
Nguyen Dinh Duc, Ngo Dinh Dat, Vu Thi Thuy Anh, Vu Dinh Giang, Pham Ngoc Thinh
Summary: This study aims to use the classical theory cylindrical shell to provide analytical solutions to illustrate the effect of magneto-electro-elastic material layer properties on the vibration of smart sandwich cylindrical shell. The results show that the addition of MEE layer has an impact on nonlinear vibration, considering different types of CNT distribution and special structural forms (elliptical cylindrical shell).
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Mechanics
M. Pakseresht, R. Ansari, M. K. Hassanzadeh-Aghdam
Summary: This paper discusses a coating solution for protecting titanium-based composites and utilizes the Mori-Tanaka method to determine the properties of the composite. The experimental results show that an increase in the thickness of the carbon coating has a negative effect on the elastic properties and stress-strain curve of the composite.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Mechanics
Mahdi Salehi, Raheb Gholami, Reza Ansari
Summary: This study presents an analytical solution approach to examine the nonlinear vibration of geometrically imperfect functionally graded porous circular cylindrical shells reinforced with graphene platelets (GPL) surrounded on an elastic foundation. The effective mechanical properties of considered functionally graded graphene platelet-reinforced porous nanocomposites are characterized via a micromechanical model. The nonlinear frequency response curves are obtained with the use of the method of multiple scales.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Acoustics
Hamed Hatami, Ahmad Bagheri, Reza Ansari
Summary: This article comprehensively analyzes the free vibration of beam-type liquid micro-pump using a free boundary approach and employs the Newmark method to obtain the natural frequencies, mode shapes, and fluid oscillations of the coupled system. The comparison between free and fixed boundary methods reveals a slight deviation in natural frequency for small oscillations of the Euler-Bernoulli micro-beam, which can be negligible.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Materials Science, Multidisciplinary
M. Eghbalian, R. Ansari, S. Haghighi
Summary: A two-stage MD-FE modeling method is developed to investigate the influence of functionalized carbon nanotubes on the mechanical properties of polymer materials. MD simulations and FE modeling are used to study the effects of nanotube properties and polymer matrix composition on the strength and stiffness of the materials. In addition, the volume fraction of nanofillers and the percentage of functionalization have significant effects on the material performance.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
S. Nesarhosseini, R. Ansari, M. Faraji Oskouie, H. Rouhi
Summary: In this paper, the free vibrations of beam-type structures subjected to rapid heating are analyzed using micropolar thermoelasticity. The equations of motion are derived based on the micropolar elasticity theory and the Timoshenko beam theory. The heat equation is modeled using the transient 1D Fourier-type heat conduction equation. The numerical approach utilizes matrix representation and the Newmark algorithm in time domain, as well as generalized differential quadrature and variational differential quadrature techniques in space domain. The effects of thermal shock and geometrical parameters on the thermally induced vibrations are investigated.
Article
Materials Science, Multidisciplinary
Yasin Keramati, Reza Ansari, Mohammad Kazem Hassanzadeh-Aghdam
Summary: This research investigates the effect of adding graphene nano-sheets (GNSs) on the elastic and piezoelectric responses of PZT-7A piezoelectric fiber/polyimide hybrid composites. It develops a nested micromechanical modeling strategy to predict the effective properties of these composites and performs parametric studies to examine the influences of various factors. The results show that the uniform dispersion of GNSs improves the elastic and piezoelectric properties, while agglomeration has a negative effect on the properties.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2023)
Article
Chemistry, Physical
M. Eghbalian, R. Ansari, S. Haghighi
Summary: The tensile properties and fracture mechanism of hydroxyl-functionalized silicon carbide nanotubes (O-fSiCNTs) inserted into polymer matrices were studied using molecular dynamics (MD) simulations based on the notion of representative volume elements (RVEs). The incorporation of chemisorbed nanotubes in polymers significantly enhances their mechanical properties. The O-fSiCNTs/PE and O-fSiCNTs/PP demonstrate lower Young's modulus, maximum stress, and strain energy compared to the O-fCNTs/PE and O-fCNTs/PP. The zigzag O-fSiCNTs/polymer exhibit lower bearable maximum strains in response to loads as opposed to the O-fCNTs/polymer.
MOLECULAR SIMULATION
(2023)
Article
Physics, Multidisciplinary
M. Bazdid-Vahdati, R. Ansari, A. Darvizeh
Summary: This paper presents two hyperelastic models for micromorphic hyperelasticity, which are suitable for materials with high dependence on the microdeformation gradient. Two new strain measures based on the microdeformation gradient are introduced and used in the hyperelastic formulation. The developed formulation allows for clear discussion of the dependency on the microdeformation gradient and the formulation of various types of hyperelastic models using the defined strain measures.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Mechanics
Alireza Beheshti, Reza Ansari
Summary: The current work focuses on analyzing the large deformation of shells made of a transversely isotropic material. A higher-order shell model is used to derive strains and extract the stress field of a hyperelastic medium. The weak form is obtained by utilizing the principle of virtual work. A four-node shell element is developed to address locking issues and incorporate transverse shear, membrane, and curvature-thickness locking for a compressible anisotropic medium. Several examples are presented to demonstrate the performance of the proposed element and the effects of anisotropy.
Article
Physics, Multidisciplinary
Y. Gholami, R. Ansari, R. Gholami
Summary: This paper examines the free vibration of single-layered graphene sheets (SLGSs) subjected to compressive in-plane loads and embedded in a Winkler-Pasternak elastic medium. It uses the high-order Cauchy-Born (HCB) method, hyperelastic membrane and second gradient elasticity theory to provide a mathematical formulation. The variational differential quadrature (VDQ) method and Hamilton's principles are applied to obtain a set of discretized governing equations of motion.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Mechanics
R. Ansari, M. Zargar Ershadi, M. Faraji Oskouie, H. Rouhi
Summary: This paper proposes a novel numerical approach to study the large-amplitude geometrically nonlinear vibrations of circular plates made of functionally graded porous materials subjected to hygrothermal loading on an elastic foundation. The modified Voigt's rule of mixture is used to estimate the hygrothermo-mechanical properties of the plates. The effects of hygroscopic stresses and different distribution patterns for porosity are considered. The governing equations for the vibrations are derived based on the first-order shear deformation plate theory and von-Karman geometrical nonlinear relations, and the Winkler-Pasternak model is used to incorporate the effect of the elastic foundation. The problem is solved using the generalized differential quadrature, variational differential quadrature, and Newmark-beta integration methods, and the influences of various parameters on the geometrically nonlinear vibrations are analyzed.
Article
Engineering, Civil
R. Ansari, M. Zargar Ershadi, H. Akbardoost Laskoukalayeh, M. Faraji Oskouie, H. Rouhi
Summary: The nonlinear vibration response of rectangular plates made of functionally graded porous materials induced by hygrothermal loading is investigated in this article using a numerical approach. The effects of elastic foundation and hygroscopic stresses are taken into account, and the temperature-dependent material properties are computed. The temporal evolution of maximum lateral deflection is obtained using the generalized differential quadrature method and Newmark integration method, and the influences of various factors on the vibrations are studied.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Materials Science, Multidisciplinary
Elaheh Kabeh Rahnama, Reza Ansari, Mohammad Kazem Hassanzadeh-Aghdam
Summary: This article investigates the effect of graphene nanoadditives on the fatigue limit of glass fiber-reinforced polymer composites. The study finds that the uniform dispersion of graphene nanosheets can improve the fatigue limit of the composites.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2023)
Article
Computer Science, Interdisciplinary Applications
Peyman Aghdasi, Shayesteh Yousefi, Reza Ansari
Summary: This paper uses DFT and FEM to study the elastic, vibrational and buckling properties of monolayer bismuthene. The developed model accurately predicts Young's modulus of the monolayer bismuthene. The influence of the vertical side length on the fundamental natural frequency is negligible, while vibrational characteristics are significantly affected by the horizontal side length.
ENGINEERING COMPUTATIONS
(2023)
Article
Mechanics
M. Rasoolpoor, R. Ansari, M. K. Hassanzadeh-Aghdam
Summary: This study investigates the low velocity impact behavior of multi-walled carbon nanotube (MWCNT)-aluminum (Al) nanocomposite plates. The material properties of the nanocomposites are obtained using the rule of mixture, considering microstructural features of MWCNTs such as quantity, aspect ratio, alignment, waviness, and agglomeration. The finite element method is utilized to analyze the dynamic behavior of the plates. The results show that the addition of MWCNTs increases contact force and decreases plate center deflection and impact duration. Higher volume fraction, aspect ratio, straight shape, and uniform dispersion of MWCNTs lead to lesser center deflection in the nanocomposite plates.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)