Article
Engineering, Marine
Ke-Chun Shen, Lei-Lei Jiang, Zhao-Qi Yang, Guang Pan
Summary: In this study, an analytical solution is proposed for the buckling problem of composite cylindrical shells subjected to hydrostatic pressure. The solution is derived by solving the differential equations using the Galerkin method and approximating the displacements and deflections of the shell. An analytical formula is derived based on this solution to predict the critical buckling pressure and buckling mode of composite cylindrical shells. The proposed approach is validated through finite element analysis and experimental tests, demonstrating its efficiency and accuracy in predicting the critical buckling pressure and buckling mode.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Xinhu Zhang, Zhun Li, Pu Wang, Guang Pan
Summary: This paper investigates the buckling and strength failure of composite cylindrical shells under hydrostatic pressure through experimental tests and finite element method. The effects of various factors on the critical buckling pressure and strength failure pressure are discussed.
Article
Engineering, Marine
Ke-chun Shen, Lei-lei Jiang, Guang Pan, Yi-hua Huang
Summary: This study investigates the buckling and failure behavior of a silicon carbide ceramic cylindrical shell under hydrostatic pressure. Experimental and numerical methods are used to analyze the shell's behavior, and the results show the significance of this research in understanding the failure mechanism of this material under hydrostatic pressure.
Article
Mechanics
Ke-Chun Shen, Guang Pan
Summary: An analytical solution and numerical analysis were used to study the buckling problem of filament winding composite cylindrical shells, showing good agreement with experimental results. The relationship between strain response and crack propagation path was investigated, revealing different patterns in circumferential and axial strain responses. Experimental results indicated that the cylindrical shell did not lose carrying capacity when buckling, but collapsed under a pressure 13.04% higher than the critical buckling pressure.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Muhammad Imran, Dongyan Shi, Lili Tong, Ahsan Elahi, Hafiz Muhammad Waqas, Muqeem Uddin
Summary: This paper presents the design optimization of a composite submersible cylindrical pressure hull under 3 MPa hydrostatic pressure. The study considers different composite materials and layups, using a Multi-Objective Genetic Algorithm and Analytical Analysis to achieve optimization objectives such as minimizing buoyancy factor and maximizing buckling load factor.
DEFENCE TECHNOLOGY
(2021)
Article
Mechanics
Ahmad Reza Ghasemi, Ali Tabatabaeian, Mohammad Hadi Hajmohammad, Francesco Tornabene
Summary: A new multi-step optimization method is developed to predict the optimal fiber orientation in GFRP composite shells, considering critical factors like ultimate buckling load and weight. Experimental evaluations were conducted to verify the analytical results predicting buckling pressure in GFRP specimens. The results showed a significant decrease in optimum local mass of composite shells under different conditions.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Marine
Muhammad Imran, Dongyan Shi, Lili Tong, Ahsan Elahi, Muqeem Uddin
Summary: This paper presents an analytical model for the elastic buckling of cross-ply composite closed cylindrical shell under hydrostatic pressure using FOSDT. The results are compared with SBE and CST, showing increasing differences with thickness. Verification against literature and finite element analysis is also carried out, demonstrating significant differences between FOSDT and other models.
Article
Computer Science, Artificial Intelligence
Ke-Jing Du, Jian-Yu Li, Hua Wang, Jun Zhang
Summary: Evolutionary multi-objective multi-task optimization is an emerging paradigm for solving multi-objective multi-task optimization problems using evolutionary computation. This paper proposes treating these problems as multi-objective multi-criteria optimization problems and develops an algorithm framework that utilizes the knowledge of all tasks in the same population. The algorithm selects fitness evaluation functions as criteria, guided by a probability-based selection strategy and an adaptive parameter learning method. Extensive experiments show the effectiveness and efficiency of the proposed algorithm. Treating MO-MTOP as MO-MCOP is a potential and promising direction for solving these problems.
COMPLEX & INTELLIGENT SYSTEMS
(2023)
Article
Mechanics
Xinhu Zhang, Zhun Li, Zhaoqi Yang, Leilei Jiang, Guang Pan
Summary: This paper investigates the buckling problems of composite shells with initial imperfections under hydrostatic pressure. A novel initial imperfection model is introduced, and analytical solutions are derived based on Sanders-type kinematic relations. The numerical examples show that proper control of initial imperfection parameters can significantly improve the critical buckling pressure, which is valuable for practical design of composite pressure hulls.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Marine
Ke-Chun Shen, Zhao-Qi Yang, Lei-Lei Jiang, Guang Pan
Summary: In this study, the buckling and post-buckling behavior of composite cylindrical shells under external hydrostatic pressure were experimentally investigated. The results showed that the deformation process included linear compression, buckling, and post-buckling. Comparing with the perfect shell, the reinforcement design of the perforated composite cylindrical shell effectively improved its load carrying capacity.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Zhun Li, C. Guedes Soares, Guang Pan
Summary: This paper presents buckling solutions for composite laminated cylindrical shells in the underwater environment. Two calculation formulas are proposed to predict the buckling pressure for the underwater composite cylinders with different boundary conditions. The results are validated by comparison with experimental data and consider the influences of geometrical imperfections.
Article
Engineering, Multidisciplinary
Mahyar Maali, Baris Bayrak, Mahmut Kilic, Merve Sagiroglu, Abdulkadir Cuneyt Aydin
Summary: Composite shells of revolution are widely used in various applications such as pressure vessels and tanks. This study investigated the buckling behavior of cylindrical shells filled with different materials and found that double layer CFRP coiling significantly impacts the initial buckling value. The use of melted polypropylene was shown to be more effective compared to other materials.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Engineering, Multidisciplinary
Zhun Li, Ke-chun Shen, Xin-hu Zhang, Guang Pan
Summary: This study examines the influence of geometric imperfections on the buckling behavior of composite cylindrical shells under hydrostatic pressure. By measuring the imperfections and conducting numerical analysis, the study identifies the impact of two representative imperfections on the buckling pressure and proposes an empirical formula for prediction.
DEFENCE TECHNOLOGY
(2022)
Article
Engineering, Civil
Yongmei Zhu, Wei Guan, Weili Wang, Cunhao Dong, Jian Zhang
Summary: This study numerically and experimentally investigated the buckling of carbon fiber composite cylindrical shells with annular ribs under external pressure. It was found that the distribution and geometry of the ribs have a significant influence on the buckling load and final collapse mode of the material.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
Jiuru Lu, Luyao Xu, Haojie Xu, Kangmei Li, Jun Hu
Summary: In this study, a variable-stiffness structural design is conducted for the composite truncated elliptical rotary shell based on gap defects and fibre continuity constraints. Optimal critical buckling coefficients of the variable stiffness composite shells subjected to external hydrostatic compression are calculated using the Abaqus finite element program. The influences of geometric parameters, boundary conditions, and shell thickness on the optimal critical buckling coefficients and first-order buckling modes are discussed through parametric studies. Finally, two critical buckling coefficient response models with geometric parameter (semiaxis ratio b/R) and fibre bundle number (N) as inputs are established for thin and thick shells using the Kriging surrogate model theory. The analysis results of the surrogate error indicate high accuracy for the two models.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
Mohammad Meskini, Ahmad Reza Ghasemi
Summary: This study investigated the free vibration characteristics of rotating functionally graded piezoelectric-fiber reinforced polymer cylindrical shells by theoretical derivation and numerical calculation, comparing the results with other studies to show good agreement between theoretical models and real situations.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Materials Science, Characterization & Testing
Akbar Takari, Ahmad Reza Ghasemi, Masood Hamadanian, Marzieh Sarafrazi, Ahmad Najafidoust
Summary: Experimental and theoretical methods were used to optimize the thermo-mechanical properties of hybrid Epoxy/TiO2/SiO2 nano-Composites, with the addition of a small amount of Silica improving the interaction between fillers and epoxy resin.
Article
Mechanics
Ahmad Reza Ghasemi, Mohammad Heidari-Rarani, Bijan Heidari-Sheibani, Ali Tabatabaeian
Summary: A new closed-form solution for transverse free vibration analysis of laminated composite beams with arbitrary number of concentrated masses is developed. The governing equations are solved semianalytically, frequency equation and mode shapes are extracted for two different boundary conditions. The study investigates the effects of mass, as well as location and number of concentrated masses on the free vibration response of the beam.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Engineering, Civil
Ali Tabatabaeian, Mehdi Lotfi, Ahmad Reza Ghasemi, Sahba Roohollahi
Summary: This research developed a new analytical framework based on micromechanics models to explore the influence of various parameters on the cured shape of hybrid FRP laminates. The study focused on the effects of mold radius, ply arrangements, and shear strain deformation term, as well as curvature response of different configurations and MWCNT percentages. Suggestions for the optimal design of hybrid FRP composite structures considering curvature response were also provided.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Environmental
Mahdi Ashrafi, Masood Hamadanian, Ahmad Reza Ghasemi
Summary: The study investigated the reinforcing effects of PEG and TiO2 nanoparticles on the mechanical properties of epoxy, finding significant improvement in elongation and tensile strength. The nanocomposites showed good mechanical stability after thermal cycling tests, with TGA analysis confirming enhanced thermal properties. Synthesized Ag-TiO2 nanostructures demonstrated enhanced antibacterial activity, as confirmed by SEM images, XRD analyses, and EDS mapping of the nanoparticles.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Article
Materials Science, Textiles
Marzieh Sarafrazi, Ahmad Reza Ghasemi, Masood Hamadanian
Summary: The research investigated the effect of ZnMoO4 nanoparticles and multi-wall carbon nanotubes on the tensile strength of the epoxy/polyurethane matrix. Results from experimental procedure and molecular dynamic simulation showed that ZnMoO4 nanoparticles and multi-wall carbon nanotubes had a significant impact on the tensile strength of the composite materials.
FIBERS AND POLYMERS
(2021)
Review
Materials Science, Multidisciplinary
Ali Tabatabaeian, Ahmad Reza Ghasemi, Mahmood M. Shokrieh, Bahareh Marzbanrad, Mohammad Baraheni, Mohammad Fotouhi
Summary: Accurate determination and control of residual stresses are crucial for understanding the interactions between microstructure, mechanical state, failure modes, and structural integrity. Different methods of residual stress determination and classification of origins and effects are essential for effective residual stress management.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Composites
M. Soltani, R. Abolghasemian, M. Shafieirad, Z. Abbasi, A. H. Amiri Mehra, A. R. Ghasemi
Summary: This study investigates the lateral buckling analysis and layup optimization of laminated composite tapered thin-walled I-beams. The research focuses on maximizing lateral-torsional stability strength and minimizing mass/cost of the structure. Classical lamination theory and Vlasov's model are used to establish the total potential energy for the beams, and the Ritz method is implemented to derive an explicit formulation for the lateral-torsional buckling load. The optimal layer sequences are obtained using the non-dominated sorting genetic algorithm, considering factors such as lateral buckling strength and mass of the structure.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Acoustics
Mohammad Meskini, Ahmad Reza Ghasemi
Summary: This study investigates the free vibration analysis of laminated composite shells with adhesive joints, considering various boundary conditions. Numerical analysis is conducted based on the first order shear deformation shell theory and compatibility conditions. The effects of geometrical parameters, material properties, and adhesive layer thickness on the natural frequency of the structure are studied. The results show that these factors have an influence on the frequency response of the structure.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Materials Science, Multidisciplinary
Ahmad Reza Ghasemi, Ali Tabatabaeian
Summary: Three experimental measurement methods, namely 'hole drilling', 'slitting', and 'curvature' methods, were considered to evaluate residual stresses in laminated polymer composite materials. The hole drilling technique is suitable for measuring stresses in the near-surface areas of the structures, the slitting method is employed to assess stresses through the depth of specimens, and the curvature method shows great potential for estimating the overall residual stress quality in laminated composites with un-symmetrical configurations.
MECHANICS OF MATERIALS
(2022)
Article
Materials Science, Composites
Seyed Hossein Taghavian, Ahmad Reza Ghasemi
Summary: The interface debonding area between face sheets and the foam cores of sandwich panels was inspected using the thermography method in this study. The samples were manufactured with different processes, classified into one-step manufacturing and two-step manufacturing. The one-step manufactured samples showed the highest flexural strength and the least discontinuity. The integrated infusion process demonstrated at least a 40% superiority in mechanical properties compared to other processes. The results indicated that the initial failure mode of the one-step manufactured samples was indentation beneath the loading roller, while the main failure mode of the two-step manufactured samples was core shear mode.
POLYMER COMPOSITES
(2022)
Article
Engineering, Mechanical
Mohammad Meskini, Ahmad Reza Ghasemi
Summary: The effects of lap joint adhesive layer on free vibration analysis of two laminated circular-cylindrical shells were investigated. Modal analysis was conducted based on the first order shear deformation shell theory, considering compatibility conditions under various boundary conditions. The results showed that increasing the overlap ratio increased the dimensionless frequency, while increasing the adhesive thickness layer slightly decreased the dimensionless frequencies.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Medicine, Research & Experimental
Marjan Pourhadi, Ahmad Ghasemi, Reza Abediny, Shaghayegh Haghjooy Javanmard, Golnaz Vaseghi
Summary: Vanillin has anti-tumor effects on melanoma by reducing the expression of NF-kappa B, leading to a decrease in tumor size and cell viability.
ADVANCED BIOMEDICAL RESEARCH
(2022)
Article
Materials Science, Characterization & Testing
Mahdi Soleymani, Ahmad Reza Ghasemi, Behzad Moslemi-Abyaneh
Summary: This research investigates the influence of carbon nanotubes agglomeration on the buckling behavior of multi-phase composite shells and validates the accuracy of the applied method through numerical simulations and experimental tests. The results indicate that the agglomeration of carbon nanotubes, weight and volume fraction of carbon nanotubes, and type of fiber materials play a key role in the buckling capacity of the composite shells.
POLYMERS & POLYMER COMPOSITES
(2022)
Article
Computer Science, Software Engineering
Amin Gharaei, Hamid Rabieyan-Najafabadi, Hossein Nejatbakhsh, Ahmad Reza Ghasemi
Summary: This research investigates the aeroelastic instability of a tail section made of aluminum isotropic material with different shell thicknesses. By using finite element analysis and the two degrees of freedom flutter analytical approach, the geometry parameters and stiffnesses for various thicknesses are determined. The equations of motion and critical modes are derived using Lagrange's methods. The results show that increasing the thickness of the isotropic airfoil section leads to an increase in flutter and divergence speeds.
ADVANCES IN COMPUTATIONAL DESIGN, AN INTERNATIONAL JOURNAL
(2022)
