Article
Engineering, Aerospace
Nguyen Dinh Duc, Phuc Pham Minh
Summary: This paper investigates the free vibration of functionally graded carbon nanotubes reinforced composite plates with cracks, using UD distribution of carbon nanotubes and TSDT and phase field theory to form vibration equations. Finite element method with enrichment of elements around the cracked area is used for solving the equations. Computational simulation analyzes the influence of various factors on the free vibration of FG CNTRC plates, as well as investigates different boundary conditions.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Mathematics, Applied
Bo Zhang, Heng Li, Liulin Kong, Xu Zhang, Zhipeng Feng
Summary: In this paper, the energy variational principle is applied to derive the differential equation of motion and boundary conditions for strain gradient Kirchhoff micro-plates. The sixth-order boundary value problem is solved using a differential quadrature plate finite element approach, and C-2 continuity of deflection is ensured through a geometric mapping scheme.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2021)
Article
Engineering, Civil
Reza Ansari, Ramtin Hassani, Yousef Gholami, Hessam Rouhi
Summary: In this study, a numerical approach called VDQFEM was employed to investigate the large deformations of plate-type structures with arbitrary hole made of FG-GPLRC under static loading. The governing equations were derived using the variational approach and solved efficiently using matrix formulation. The effects of geometrical properties and GPL reinforcement on the nonlinear maximum deflection-transverse load amplitude curve were studied through numerical examples.
STRUCTURAL ENGINEERING AND MECHANICS
(2023)
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
Engineering, Aerospace
Gaurav Watts, Rajesh Kumar, Sandeep Singh, Vasudev Sengar, G. R. Reddy, S. N. Patel
Summary: This study investigates the postbuckling and postbuckled vibration behavior of trapezoidal sandwich plates with functionally graded carbon nanotube reinforced composite face sheets and porous metal foam core, considering the influence of non-uniform edge compression. The plate's kinematic assumptions are based on a refined higher order theory and the strain-displacement relations include von Karman assumptions for geometrical nonlinearity. The study presents new results on the nonlinear stability and vibration behavior of sandwich plates with initial imperfections, which can serve as benchmark solutions for further research.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
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
Mechanics
Erfan Cheshmeh, Mohammed Karbon, Arameh Eyvazian, Dong Won Jung, Mostafa Habibi, Mehran Safarpour
Summary: The buckling and vibration analysis of FG-CNTRC rectangular plate are investigated based on 12-unknown higher order shear deformation theory (HSDT) in this study. The study explores the influence of temperature distribution and boundary conditions on the behavior of the plate through numerical analysis and parametric study.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Multidisciplinary
Yu Wang, Chuang Feng, Jie Yang, Ding Zhou, Shuguang Wang
Summary: This study investigates the nonlinear vibration characteristics of functionally graded graphene platelets (GPLs) reinforced composite (FG-GPLRC) plate subjected to electrical loading. By considering three functionally graded profiles and using effective medium theory (EMT), the study derives nonlinear governing equations for the plate's free vibration and numerically solves them using the differential quadrature method (DQM). The results demonstrate the active tuning of vibration behaviors of the FG-GPLRC plates by varying the attributes of the electrical fields.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Mechanics
Yingyan Wang, Rui Zeng, Mehran Safarpour
Summary: This study analyzed the thermal vibration of functionally graded graphene platelets reinforced composite annular plate on an elastic foundation using the generalized differential quadrature method. Through a comprehensive parametric study, it was found that the temperature rise pattern and distribution of graphene platelets have a significant impact on the structure response.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Mechanics
Tao Fu, Xing Wu, Zhengming Xiao, Zhaobo Chen
Summary: An accurate and analytical method for investigating the dynamic instability of laminated functionally graded carbon nanotube reinforced composite (FG-CNTRC) conical shell surrounded by elastic foundations is proposed. The validity of the theoretical model is verified by comparing numerical results with existing solutions, and the influences of various factors on the dynamic stability of laminated FG-CNTRC conical shell are investigated.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Construction & Building Technology
Mingjie Liu, Shaoping Bi, Sicheng Shao, Hadi Babaei
Summary: In this research, the nonlinear free vibrations of curved pipes made of functionally graded carbon nanotube reinforced composite materials are investigated. The study considers the temperature distribution and thermomechanical properties of the pipes, as well as their mechanical behavior. By solving the motion equations and obtaining the small and large amplitude frequencies, the effects of properties and various factors on the frequency of the nanocomposite pipes are analyzed.
STEEL AND COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Wei Xiang, Xin Li, Lina He
Summary: This paper proposes an improved differential quadrature finite element method (DQFEM) that combines the virtual boundary spring technique with the standard DQFEM to handle the free vibration of Mindlin plates with arbitrary elastic constraints. The inclusion of the virtual boundary spring technique allows for the imposition of general elastic constraints, including classical boundary conditions, and overcomes the shortcomings of the classical elimination method.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2022)
Article
Engineering, Civil
Mohammad Javad Bayat, Amin Kalhori, Masoud Babaei, Kamran Asemi
Summary: This research investigates the natural frequency response of a functionally-graded multilayer graphene-reinforced composite plate with circular cutout reinforced by orthogonal stiffeners for the first time. The study finds that adding a set of stiffeners can significantly enhance the fundamental frequency while only causing a small increase in mass.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Construction & Building Technology
Vu X Nguyen, Qui X Lieu, Tuan A Le, Thao D Nguyen, Takayuki Suzuki, Van Hai Luong
Summary: This article introduces a coupled finite element method (FEM)-boundary element method (BEM) for analyzing the hydroelastic response of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) floating plates under moving loads. The plate displacement field is described using a generalized shear deformation theory (GSDT)-based FEM, while the fluid hydrodynamic modeling is done using the linear water-wave theory (LWWT)-based BEM. The results obtained by this method are validated through comparisons with analytical solutions and experimental data, and the influences of different parameters on the hydroelastic behavior of the plates are examined.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
J. R. Cho
Summary: This study conducted a nonlinear numerical analysis of a functionally graded carbon nanotube-reinforced composite plate on an elastic foundation, revealing significant influences of parameters on non-dimensional deflection and bending moment.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
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
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
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
Engineering, Civil
R. Ansari, M. Zargar Ershadi, H. Akbardoost Laskoukalayeh, H. Rouhi
Summary: This article develops a numerical approach to study the geometrically nonlinear vibrations of annular sector plates made of functionally graded materials (FGMs) due to cooling shock. The effects of various parameters on the large-amplitude vibrations of annular sector plates are investigated through numerical simulations.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Hamidreza Yademellat, Reza Ansari, Abolfazl Darvizeh, Jalal Torabi, Ali Zabihi
Summary: This study investigates the size-dependent dynamic pull-in instability of piezoelectrically and electrostatically actuated micro/nanobeams using the nonlocal strain gradient theory. The effects of flexoelectricity and piezoelectricity are considered, and various nonlinear forces are taken into account. The analysis method used in this study improves the reliability of the research model by comparing the results with existing literature.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(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)