Article
Engineering, Mechanical
Philip Schreiber, Christian Mittelstedt
Summary: The aim of this study is to improve the stability analysis method of unsymmetric laminated structures. By using discrete plate theory, the problem is simplified to a single plate. Explicit solutions for the buckling load are provided for unsymmetric laminates with different boundary conditions, and the results are compared with finite element analysis, showing good agreement.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Mechanics
Yang Zeng, Zifeng Shi, Caiyu Yin, Jingxi Liu, Guoqing Li
Summary: In this investigation, the transverse vibration of rectangular plates with internal rectangular supports and elastically restrained boundary conditions is solved using the Rayleigh-Ritz technique. The admissible functions, which are the combination of cosine series and auxiliary sine functions, show better convergence with four terms of sinusoidal auxiliary functions. Numerical results show that the internal support stiffness has significant effects on the free vibration frequencies and mode shapes of the plate.
Article
Engineering, Civil
Yangye He, Menglan Duan, Jian Su
Summary: This work presents generalized integral transform solutions for the bending problem of orthotropic rectangular thin plates with rotational restraints and free edges, showing rapid convergence and high accuracy. The solutions utilize numerically stable exponential function form eigenfunctions for beams with different boundary conditions, allowing for the determination of transversal deflection under various load distributions. The effects of rotational restraints on the deflection of orthotropic rectangular plates with different boundary condition combinations are also investigated.
ENGINEERING STRUCTURES
(2021)
Article
Mechanics
D. H. Li, A. S. Wan
Summary: In this study, two-dimensional shear deformation theories (SDT) and multiscale analysis methods were used to analyze composite laminates. A two scale layerwise multiscale analysis method (LMAM) based on Reddy's layerwise theory (RLWT) and O(1) homogenization method was proposed to accurately analyze local stress fields. Numerical simulations verified the effectiveness of LMAM in analyzing unidirectional and woven composite plates at both macroscopic and microscopic levels.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Yang Hao, Manuel George, Rajeshkumar Selvaraj, Kundan Meshram, Amal M. Al-Mohaimeed, Rey Y. Capangpangan, Arnold C. Alguno, Mohammed Al-Bahrani
Summary: This study investigates the bending and dynamic buckling analysis of graphene reinforced CFRP composite plates. Experimental and numerical analyses are conducted to explore the influence of graphene weight percentage, aspect ratios, and end conditions on the performance of the composite plates.
Editorial Material
Mechanics
Zhengxiong Chen, Bin Qin, Qingshan Wang, Rui Zhong, Ailun Wang
Summary: The first order shear deformation theory (FSDT) is used to formulate a generalized model of laminated open cylindrical shell coupled with rectangular plates (LOSPS). The characteristics of free vibration and steady state response of the combination are investigated. The technique of artificial springs is used to simulate the coupling relationships between the adjacent substructures and boundary edges, and the specific coupling formulas between the adjacent substructures are presented. Then, an improved Fourier series is introduced for the displacement admissible functions of LOSPS, and the unknown coefficients of the displacement components are derived with the Rayleigh-Ritz method. The proposed method demonstrates convergence and good accuracy through numerical examples. Comprehensive vibration analyses are implemented to study the influence mechanism of key parameters, obtaining new results. This innovative work can serve as a reference for related research.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Miao Wang, Yong-Gang Xu, Pizhong Qiao, Zhi-Min Li
Summary: In this study, semi-analytical solutions for buckling and free vibration analysis of graphene-reinforced composite laminated plates are presented using the multi-term Kantorovich-Galerkin method. Various factors affecting the behavior are examined, revealing interesting findings such as the equivalence of uniaxial buckling loads and the change in buckling mode with aspect ratio.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
D. H. Li, P. X. Wu, A. S. Wan
Summary: A layerwise multiscale analysis method based on Reddy's theory and O(1) homogenization method is proposed for composite laminated plates. This method considers the periodicity in both in-plane and thickness directions and utilizes discretization and finite element methods to establish macroscopic, mesoscopic, and microscopic models. The results demonstrate the accuracy of the proposed method.
MECHANICS OF MATERIALS
(2023)
Article
Mechanics
Michio Innami, Shinya Honda, Katsuhiko Sasaki, Yoshihiro Narita
Summary: An accurate and straightforward analytical method is proposed for the free vibration analysis of laminated composite rectangular plates with blended layers. The method is verified through numerical comparisons and tested in vibration optimization, showing that the introduction of blended layers is an effective approach to design the dynamic characteristics of laminated composite plates.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Aerospace
Mauricio M. Nilton, Andre V. G. Cavalieri, Mauricio Donadon, William R. Wolf
Summary: The addition of viscoelastic layers to composite plates is shown to reduce scattered noise near resonance frequencies. Factors such as the positioning, thickness, and operating temperature of viscoelastic layers play a key role in modifying the far-field sound scattered by plates interacting with point quadrupoles.
Article
Engineering, Civil
Sixin Huang, Pizhong Qiao
Summary: This study investigates the web buckling behavior of thin-walled fiber-reinforced plastic (FRP) composite beams under transverse loading, providing explicit solutions and universal analytical charts/formulas. The accuracy of the method is validated and practical guidelines for different scenarios are proposed to predict web buckling strength in FRP composite structural shapes.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
J. Tenenbaum, M. Eisenberger
Summary: This paper derives analytical solutions for the buckling loads of thin rectangular plates with internal supports and different boundary conditions. The analytical method is based on developing a static solution for the plate. Buckling is defined as the loss of stiffness, where zero force on the plate surface generates infinite displacement. Using this new method, exact buckling loads and modes are obtained for various cases of plates with different boundary conditions and internal supports.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
Taoye Lu, Hui-Shen Shen, Hai Wang, Xiuhua Chen, Miaolin Feng
Summary: This paper proposes a physical model to report new features of CFRTPC laminated plates undergoing thermo-mechanical loads. The temperature-dependent and strain-dependent stress-strain relations of CFRTPC are determined experimentally, and the nonlinear bending responses and thermal postbuckling behaviors of CFRTPC laminated plates are predicted. The influences of temperature variation, geometric parameters and boundary conditions on the nonlinear bending deflection, moment and thermal postbuckling behaviors are compared.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Morteza Saadatmorad, Ramazan-Ali Jafari-Talookolaei, Mohammad-Hadi Pashaei, Samir Khatir
Summary: A new method called WT-CNN is proposed for damage detection of rectangular laminated composite plates, combining convolutional neural networks and two-dimensional wavelet transform. By developing finite element models of damaged RLCPs and using optimal wavelet functions, the WT-CNN is trained to accurately predict and detect damage locations in RLCPs, eliminating trial and error simulations for future input signals.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Krzysztof Magnucki, Ewa Magnucka-Blandzi
Summary: The paper presents the analytical model of sandwich structures, proposing a continuous variation of mechanical properties in the thickness direction of the structure wall and developing an individual nonlinear theory of deformation normal to the neutral surface. Using the principle of stationary potential energy, two differential equations of equilibrium for the plate are obtained and analytically solved, deriving the maximum deflection and critical loads of the example plates. The results of these analytical studies are presented in Figures and Tables.
COMPOSITE STRUCTURES
(2021)
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
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
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
Engineering, Mechanical
Babak Ramazani Darvazi, Javad Rezapour, Saeed Rouhi, Raheb Gholami
Summary: In this paper, the nonlinear vortex-induced vibration of electrostatically actuated microbeam is studied based on modified strain gradient theory. The effects of mid-plane stretching, electrostatic actuation, Casimir and intermolecular forces are considered. By applying the Hamilton's principle and using the Galerkin method, the governing equations of motion are derived and the dynamic response and various characteristics are analyzed.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(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
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)
