Article
Mechanics
Vuong Nguyen Van Do, Chin-Hyung Lee
Summary: This study introduces a new plate formulation based on a generalized layerwise theory in the isogeometric analysis (IGA) framework, aiming to investigate the bending and free vibration behavior of a laminated composite plate. The displacement-based layerwise theory assumes an individual displacement field expansion inside each layer, with the transverse displacement component being C-0-continuous at the layer interfaces for a more precise description of stress states. The C-0 continuity enforcement across the thickness is easily implemented in the present formulation using the knot insertion technique of IGA.
Article
Mechanics
Miroslav Marjanovic, Gunther Meschke, Emilija Damnjanovic
Summary: The paper presents the development of an object-oriented computational framework for 3D bending and free vibration analysis of multilayer plates, using Reddy's plate theory and layered finite elements. The proposed solver features fast assembly of sparse matrices using matrix vectorization and a novel algorithm for evaluating interlaminar stresses at layer interfaces, ensuring continuity. The performance, efficiency, and accuracy of the computational framework are demonstrated through validation examples comparing results to the exact solution.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Yang Yan, Bo Liu, Yufeng Xing, Erasmo Carrera, Alfonso Pagani
Summary: This work investigates the free vibration behavior of variable stiffness composite laminates (VSCLs) using the Carrera Unified Formulation (CUF) and weak form differential quadrature finite element method (DQFEM). The novel solutions proposed in the research allow for more robust formulations of Equivalent Single Layer (ESL) and Layer-Wise (LW) models, with accuracy and effectiveness validated through numerical examples and comparison to published data.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Qing Xia, Ping Xiang, Lizhong Jiang, Jianwei Yan, Linxin Peng
Summary: In this study, free vibration and bending of laminated plates on Winkler foundations were investigated using a combination of generalized layerwise theory and meshless radial point interpolation method. The numerical stability and applicability of the method were verified through a comparative study with literature solutions. The influence of Winkler modulus parameters on vibration performance and bending performance was examined.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
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
Mechanics
Andras Szekrenyes
Summary: This paper presents a numerical modeling method for delaminated composite plates using the differential quadrature method. A semi-layerwise modeling technique is proposed to accurately capture the delaminated and intact parts of the plates. The results show that the proposed solution has good accuracy and effectiveness in comparison with spatial finite element models.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
Ali Dogan
Summary: This study examines the dynamic response of viscoelastic plates reinforced with functionally graded carbon nanotube-reinforced composite material (FG-CNTRC) under dynamic loads, with the focus on single-walled carbon nanotubes (SWCNTs). The research explores the dynamic analysis of CNTRC plates and investigates different carbon nanotube configurations, including uniform and functionally graded distributions. The equations of motion for the composite plates are derived using Hamilton's principle and converted into the Laplace domain for solution.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Computer Science, Interdisciplinary Applications
Hicham Hirane, Mohamed-Ouejdi Belarbi, Mohammed Sid Ahmed Houari, Abdelouahed Tounsi
Summary: This paper introduces a novel finite element model for the analysis of static and free vibration of functionally graded material (FGM) sandwich plates, with a computationally efficient element developed for the model. The results indicate promising accuracy and convergence rate for thin and thick FGM sandwich plates.
ENGINEERING WITH COMPUTERS
(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
Engineering, Multidisciplinary
K. A. Hasim, A. Kefal
Summary: This study presents an isogeometric layerwise element, L-IGA, based on the principle of virtual displacement theory to model the bending behavior of laminated smart composite plates integrated with piezoelectric layers. L-IGA utilizes high-order NURBS functions for geometry and kinematic variables discretization, ensuring exact geometry and highly accurate solutions.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Mechanics
Zhengguang Xiao, Yaogang Wu, Dinghe Li
Summary: This paper proposes a thermo-electro-mechanical extended layerwise method for studying the dynamic problems of piezoelectric laminates with delaminations or/and transverse cracks. The method uses strong discontinuous functions and the extended finite element method to model delaminations and transverse cracks, respectively. The Newmark integration algorithm and Crank-Nicolson scheme are used to solve the transient multi-physical fields simultaneously. The proposed method is validated through numerical examples with a three-dimensional model.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Yaogang Wu, Zhengguang Xiao, Dinghe Li, Jianxin Xu
Summary: An extended layerwise/solid-element method (XLW/SE) is proposed for analyzing stiffened laminated composite plates with piezoelectric patch, taking into account the effects of debonding, multiple delaminations, and transverse cracks. The governing equations are established using the extend layerwise method for the laminated composite plates and piezoelectric patch, while the stiffeners are modeled using three-dimensional solid elements. The results show good agreements with those calculated using 3D elastic models in commercial software.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
Omer Civalek, Shahriar Dastjerdi, Bekir Akgoz
Summary: This article investigates the free vibration and buckling behaviors of CNT-reinforced cross-ply laminated composite plates using FSDT and DSC methods. Parametric study is conducted to analyze the effects of various factors on frequencies and buckling loads.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(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
Engineering, Mechanical
Balakrishna Adhikari, B. N. Singh
Summary: This paper conducts a finite element study on the geometric nonlinear static and dynamic response of laminated functionally graded CNT reinforced composite plates, using the Green Lagrange strain field based on vonKarman assumptions. The research derives governing equations for the nonlinear behaviors of the plate and analyzes nonlinear dynamic responses using the Newmark integration scheme. The impact of various parameters on the nonlinear static and dynamic response of the FG-CNTRC plate is also studied.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Mechanics
Adel Bidzard, Parviz Malekzadeh, Saeed Reza Mohebpour
Summary: A nonlinear finite element model based on MSGT and FSDT is developed for analyzing the free vibration of FG-GPLRC toroidal micropanels. The study considers the impacts of geometric parameters, thickness-to-MLSP ratio, temperature rise, coefficients of elastic foundation and rotational springs, as well as different GPLs distribution patterns on the nonlinear vibrational behaviors of the micropanels.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Farhad Serajzadeh, Parviz Malekzadeh
Summary: This study investigates the dynamic responses of curved sandwich beams with functionally graded carbon nanotube reinforced composite face sheets and porous core subjected to low velocity impact. A layerwise-finite element approach based on the two-dimensional elasticity theory is used to accurately simulate the dynamic behavior. The contact force is estimated using the modified Hertz law. Parametric studies are carried out to examine the effects of carbon nanotube distribution patterns, impactor velocity, curved beam opening angle, length-to-thickness ratio, and core-to-face sheet thickness ratio on the responses of the sandwich curved beams.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Civil
Amin Ghorbani Shenas, Sima Ziaee, Parviz Malekzadeh
Summary: The size-dependent nonlinear free vibration characteristics of rotating functionally graded trapezoidal microplates are studied using a four variable refined plate theory coupled with the modified strain gradient theory. The effects of different geometric and material parameters on the nonlinear to linear frequency ratio are investigated. It is found that rectangular microblades have higher frequencies than trapezoidal ones, and the temperature rise has a hardening effect while the length scale parameter has a softening effect on the frequency ratio.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Civil
Yasin Heydarpour, Parviz Malekzadeh, Hanxing Zhu
Summary: This research investigates the dynamic responses of multilayer functionally graded graphene platelets reinforced composite spherical panels under blast loading. The motion equations are discretized using a numerical method, and the results are validated through comparison. The effects of different parameters on the transient responses are studied through parametric analysis.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2022)
Article
Engineering, Marine
H. Ghadirian, S. R. Mohebpour, P. Malekzadeh, F. Daneshmand
Summary: This paper investigates the possibility of increasing pipeline stability by using composite pipes reinforced by carbon nanotubes, deriving equations of motion using a higher order shear deformation theory and finite element analysis. The study also examines the effects of various parameters on the vibration characteristics and stability limits of composite pipes conveying fluid, comparing results with traditional beam theories.
Article
Mechanics
Hossein Ghadirian, Saeidreza Mohebpour, Parviz Malekzadeh, Farhang Daneshmand
Summary: This paper studies the nonlinear free vibrations and stability of pipes conveying fluid constructed of Functionally Graded Carbon Nano-Tube Reinforced Composite (FG-CNTRC) materials. The material properties are graded within the thickness direction and estimated using the modified rule of mixtures. The nonlinear effects are considered using the von K'arm'an geometric nonlinear theory. The system is numerically investigated using the super convergent finite element method, and the Newmark and Newton-Raphson methods are applied to solve the resulting set of ordinary nonlinear differential equations. The mathematical approach's applicability is studied through several numerical investigations.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Moosa Khooran, Mohammad Reza Golbahar Haghighi, Parviz Malekzadeh
Summary: This paper proposes a multi-window stacking method with simple architectures to accurately estimate remaining useful life (RUL). The method trains simple networks on preprocessed time series with different window lengths and uses ridge regression to determine the weights of multiple predictions. Experimental results show the superiority of this method compared to other models on the same dataset.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Ehsan Mahmoodi, Parviz Malekzadeh, Saeed Reza Mohebpour
Summary: This paper presents an analytical transient analysis of a functionally graded (FG) coated cylindrical bar weakened by multiple radial cracks under torsional transient loading. The study provides insight into the dislocation stress field, dislocation density function, dynamic stress intensity factors (DSIFs), and torsional rigidity, while exploring the effects of various factors on the results.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Civil
F. Bahranifard, P. Malekzadeh, M. R. Golbahar Haghighi
Summary: This article investigates the dynamic responses of sandwich truncated conical shells with graphene platelets reinforced composite (GPLRC) face sheets, porous core, and circumferential stiffeners under asymmetric internal ring-shaped moving load. The study explores the influences of various factors such as core porosity, face sheets, GPL parameters, shell geometric parameters, boundary conditions, and the arrangement, number, and size of stiffeners on the results. It is found that porosity, face sheets, and stiffener parameters play important roles in the dynamical response of the shells under investigation.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Farshid Bahranifard, Parviz Malekzadeh, Mohammad Reza Golbahar Haghighi
Summary: The nonlinear vibrational characteristics and responses of sandwich beams with graphene platelets reinforced composite face sheets and porous core under a moving load are studied. The addition of a small amount of graphene platelets significantly increases the stiffness of the overall beam. Parametric studies show that the distribution patterns of the porosity, as well as the geometric parameters and material properties, have an influence on the response of the sandwich beam.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Multidisciplinary
Quoc-Hoa Pham, Van Ke Tran, Trung Thanh Tran, Phu-Cuong Nguyen, Parviz Malekzadeh
Summary: A finite element modeling combined with the strain gradient theory (SGT) and the refined higher-order shear deformation beam theory is developed to study the dynamic instability of magnetically embedded functionally graded porous (FGP) nanobeams. The influences of various parameters on the dynamic instability of nanobeams are studied in detail, revealing their effects on the behavior of nanobeams.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Mechanics
Ahmad Reza Noroozi, Parviz Malekzadeh
Summary: This study investigates the nonlinear response of multilayer functionally graded graphene platelets reinforced composite (FG-GPLRC) skew plates under moving load. Nonlinear kinematic relations are derived based on higher-order shear deformation theory and von K'arm'an nonlinear geometric assumptions. A meshfree radial point interpolation method is used to discretize the motion equations. Different boundary conditions are imposed using the mixed collocation-Lagrange multiplier method. The results show that the dynamic magnification factor of the multilayer FG-GPLRC skew plates based on the nonlinear theory is lower than the one based on the linear theory.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
Vahid Shokouhifard, Saeedreza Mohebpour, Parviz Malekzadeh
Summary: This study investigates the linear and nonlinear free vibration behaviors of carbon nanotubes (CNTs) reinforced multiphase magneto-electro-elastic (MEE) deep plane-curved beams. The MEE material consists of piezoelectric Barium Titanate and piezomagnetic Cobalt ferrite. Uniform and different functionally graded distributions of CNTs along the beam thickness direction are considered. The effective material properties of CNT-reinforced MEE beams are estimated using the rule of mixture. The governing equations are derived based on the first-order shear deformation beam theory (FSDBT) with von Karman's geometric nonlinearity assumptions and the space domain is discretized using the differential quadrature method (DQM). Harmonic balance and direct-iterative methods are then used to obtain linear and nonlinear natural frequencies of the beam. The present approach is validated by its fast convergence rate and the numerical results are compared with existing literature for different straight and curved beams. The influences of various parameters on the linear and nonlinear fundamental frequencies of the CNT-MEE deep plane-curved beams are studied. It is found that considering the magnetic effects can increase the linear and nonlinear fundamental frequencies by about 3.1% and 7.2% respectively.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING
(2023)
Article
Engineering, Civil
Quoc-Hoa Pham, Parviz Malekzadeh, Van Ke Tran, Trung Nguyen-Thoi
Summary: In this study, a two-node beam element enriched based on the Lagrange and Hermite interpolation function is proposed to solve the governing equation of a functionally graded porous (FGP) curved nanobeam on an elastic foundation in a hygro-thermo-magnetic environment. The material properties of curved nanobeams change continuously along the thickness via a power-law distribution, and the porosity distributions are described by an uneven porosity distribution.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2023)
Article
Mechanics
Farshid Bahranifard, Parviz Malekzadeh, Mohammad Reza Golbahar Haghighi, Mahmoud Malakouti
Summary: In this study, the vibrational behaviors of point supported truncated conical sandwich shells are investigated. The point supports are simulated using elastic springs and the motion equations are derived using a zigzag shell theory. The results show that the number of point supports, porosity and its distribution, graphene platelets content, and circumferential stiffeners have significant effects on the vibration frequencies of the shells.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
