Article
Mechanics
Chetan Kumar Hirwani, Pradeep Kumar Mishra, Subrata Kumar Panda
Summary: The nonlinear micromechanical finite element model is used to analyze the steady-state time-dependent deflections of weakly connected layered composite panels, considering different displacement theories and environmental effects. Various techniques are employed to predict deflection parameters under steady-state loadings, and the model responses are compared with published data to capture actual structural distortion. The applicability of the micromechanical FE model for predicting structural behavior is discussed based on numerical experiments involving geometry, material properties, end constraints, and debonding parameters.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Francesco S. Liguori, Domenico Magisano, Leonardo Leonetti, Giovanni Garcea
Summary: This work introduces a cost-effective and reliable numerical framework for geometrically nonlinear thermoelastic analyses of thin-walled structures. The approach includes isogeometric solid-shell formulation for accurate geometry approximation and a generalised arc-length method for solving the equations efficiently. The framework also features a consistent definition of tangent operators and a mixed integration point strategy for robust analysis.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Pruthwiraj Sahu, Nitin Sharma, Hukum Chand Dewangan, Subrata Kumar Panda
Summary: This research analyzes the time-dependent deflection values of flat/curved hybrid fiber-reinforced composite panels under mechanical loading and elevated thermal environment. Numerical responses are computed using a higher-order kinematic model and the steady-state deflections are obtained through finite element method with Newmark's time integration method. The validity of the numerical solutions is verified using experimental and benchmark results. Additionally, a parametric study is conducted to investigate the dynamic deflection characteristics of hybrid composite shallow shell panels.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Francesco S. Liguori, Domenico Magisano, Antonio Madeo, Leonardo Leonetti, Giovanni Garcea
Summary: The multi-modal Koiter method is a reduction technique used to quickly estimate the nonlinear buckling response of structures requiring fine discretization. The simplified model, based on a quadratic approximation and projection onto a modal subspace, has been reformulated for geometrically nonlinear thermoelastic analyses.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2022)
Article
Mechanics
Dragan Kovacevic, Frans P. van der Meer
Summary: In this paper, a micromechanical framework for modeling the rate-dependent response of unidirectional composites subjected to off-axis loading is introduced. The model not only considers the rate dependency and finite strains of the material, but also includes the geometric nonlinear effect during the deformation process.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Y. H. Huang, M. C. Niu, N. Y. Duan, H. X. Hua
Summary: In this study, a meshless shell method based on CSPM is proposed for large deformation, with only one layer of particles required in the reference plane to discretize the shell model. The method addresses general issues of low precision and particle deficiency in standard SPH, and automatically satisfies the free boundary condition through modified governing equations.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Civil
M. S. H. Al-Furjan, Reza Dehini, Masoud Paknahad, Mostafa Habibi, Hamed Safarpour
Summary: This article presents the nonlinear free and forced vibration analysis of multi-scale hybrid nano-composites annular plate under hygro-thermal environment and mechanical loading, using third-order shear deformation theory and Von Karman nonlinear shell model. The research outcomes indicate that the moisture change and orientation angle parameter increase the structure's frequency, and the nonlinear parameter affects the dynamic behavior of the plate. Decreasing the structure's flexibility may lead to unstable responses.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Qi Zhang, Shaofan Li, A-Man Zhang, Yuxiang Peng, Jiale Yan
Summary: In this study, a state-based peridynamics theory was developed to model and predict large deformation of Reissener-Mindlin shells with thick walls. The theory offers an integral formulation for solving material failure problems involving discontinuous displacement fields. Numerical calculations and validation tests demonstrate the accuracy and convergence of this nonlocal structural mechanics model.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Takayuki Nishino, Junji Kato
Summary: This study proposes a robust topology optimization method that considers uncertainties in load magnitude and direction on geometrically nonlinear structures. The method combines expected value and standard deviation of end-compliance, using quadratic approximation to reduce computational cost. The importance of considering geometrical nonlinearity for obtaining robust structures is emphasized through numerical examples.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Mechanics
Ying Li, Ye Tang
Summary: This study proposes the application of three-directional functional graded materials (3D FGMs) for advanced devices in aerospace, marine engineering, and nuclear fields. The research establishes the nonlinear governing equation for structures and presents an analytical solution for nonlinear bending response using the iterative technique. It reveals the impact of 3D FGMs and hygro-thermal properties on nonlinear behavior.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Venugopal Barathan, Vasudevan Rajamohan
Summary: This study investigates the nonlinear buckling response of a composite sandwich semi-ellipsoidal shell subjected to uniform hydrostatic external pressure. Numerical and experimental methods are used to analyze the shell's behavior under different configurations and parameters. The results show that the critical pressure is influenced by the honeycomb core configurations, ply orientation of face sheets, aspect ratio, slenderness, and geometric imperfections of the shell.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Wanzhi Qiao, Tieding Guo, Houjun Kang, Yueyu Zhao
Summary: The nonlinear vibration of a shallow arch-rigid body (elastically supported) coupled system is investigated, aiming at refining the modeling of dynamic interactions in complex arch structures built on weak soils. A direct perturbation formulation is used to propose an arch-rigid body coupled model by simplifying the weakly moving arch boundary as a rigid body supported by elastic springs. The coupling coefficients of the arch-rigid body are asymptotically derived, and the moment of inertia and height of the rigid body are found to be important quantitative measures of coupling intensity.
NONLINEAR DYNAMICS
(2023)
Article
Environmental Sciences
Han Su, Rui Zou, Xiaoling Zhang, Zhongyao Liang, Rui Ye, Yong Liu
Summary: This study aimed to measure the strength of nonlinearity in water quality responses and explore different types of responses in shallow eutrophic water bodies. The results showed that most water quality responses were linear or near-linear, but total phosphorus and chlorophyll a could exhibit more types of nonlinearity.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Mechanical
Mohammed Shakir, Mohammad Talha, David Hui, Wei Gao
Summary: This study investigates the influence of initial geometric imperfections on large amplitude vibration of shallow sandwich shells with functionally graded graphene nanoplatelets reinforced porous core. The nonlinear governing equations are derived using higher order shear deformation theory and Sander's approximation. Various imperfection modes and their effects on the vibration response are explored in detail.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2023)
Article
Mechanics
Sai Sidhardh, Sansit Patnaik, Fabio Semperlotti
Summary: This study presents a theoretical and computational framework based on fractional calculus for analyzing the nonlocal static response of cylindrical shell panels, exploring both linear and geometrically nonlinear static responses. Using the fractional finite element method, the impact of long-range interactions in curved structures is efficiently and accurately considered.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2022)
Article
Mechanics
Ali Shariati, S. Sedighi Bayrami, Farzad Ebrahimi, Ali Toghroli
Summary: This article investigates the wave propagation of a sandwich composite beam with a tunable electro-rheological (ER) fluid core. The governing equations of motion are derived using Hamilton's principle, and an analytical solution is utilized to obtain the wave frequency and phase velocity through solving an eigenvalue problem. Additionally, the effects of different parameters, such as electric field, core-to-top layer thickness ratio, and ER core thickness, on the wave dispersion characteristics are investigated.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Physics, Multidisciplinary
Farzad Ebrahimi, Mostafa Nouraei, Ali Seyfi
Summary: An analytical approach was developed to investigate wave propagation in GOP reinforced nanocomposite plates under thermal loading. The study derived governing differential equations and solved them analytically to obtain wave frequency and phase velocity. The influences of various parameters on wave propagation behavior were also covered.
WAVES IN RANDOM AND COMPLEX MEDIA
(2022)
Article
Physics, Multidisciplinary
Farzad Ebrahimi, Ali Seyfi
Summary: This investigation focuses on the wave propagation analysis of porous metal foam on the Kerr substrate in a thermal environment using the refined higher-order plate theory. Different types of temperature rise and pore distributions are studied. The effects of various parameters on the wave frequency and phase velocity of the metal foam plate are presented in detail.
WAVES IN RANDOM AND COMPLEX MEDIA
(2022)
Article
Physics, Multidisciplinary
Farzad Ebrahimi, Ali Dabbagh
Summary: This study conducts a free oscillation analysis on shells made of multi-scale hybrid nanocomposites, focusing on the destructive effect of nanofiller agglomeration on the system's dynamics. The equivalent material properties of the hybrid nanocomposite are obtained through a bi-level micromechanical procedure. The influence of agglomerated carbon nanotubes (CNTs) on the stiffness of the nanocomposite is considered using the Eshelby-Mori-Tanaka method. The governing equations for the system are derived, and the natural frequencies are obtained using Galerkin's method. The study reveals that hybrid nanocomposite shells may experience resonance phenomenon in low-frequency range, especially when the impact of CNTs' aggregation is neglected.
WAVES IN RANDOM AND COMPLEX MEDIA
(2022)
Article
Physics, Multidisciplinary
Farzad Ebrahimi, Ali Seyfi
Summary: This paper investigates the wave propagation analysis of multi-scale hybrid nanocomposite plates, taking into account the influence of nanoparticle aggregation. Micromechanical methods are used to calculate the effective material properties, while a refined shear deformation theory is implemented for motion relations. The governing equations are derived using the principle of Hamilton and solved analytically. The effects of various parameters on phase velocity and wave frequency are examined, showing that the mechanical response decreases when nanotubes are covered by clusters.
WAVES IN RANDOM AND COMPLEX MEDIA
(2022)
Article
Mechanics
Farzad Ebrahimi, Ali Dabbagh, Abbas Rastgoo
Summary: This paper investigates the buckling problem of a multi-scale hybrid nanocomposite shell for the first time while the cylinder is supposed to be rested on an elastic substrate. The effects of nanofillers' agglomeration and the equivalent material properties of the carbon nanotube-reinforced (CNTR) nanocomposite are studied. The results provide insights into the failure behavior and propose strategies to enhance the buckling resistance of the nanocomposite structure.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Chemical
Seref Doguscan Akbas, Shahriar Dastjerdi, Bekir Akgoez, Omer Civalek
Summary: This paper investigates the dynamic behavior of a functionally graded porous microbeam under a moving load and explores the effects of porosity coefficient, porosity distribution, material distribution, and length scale parameter on its dynamic responses through a detailed parametric study.
TRANSPORT IN POROUS MEDIA
(2022)
Article
Engineering, Multidisciplinary
Shahriar Dastjerdi, Mohammad Malikan, Bekir Akgoz, Omer Civalek, Tomasz Wiczenbach, Victor A. Eremeyev
Summary: In this study, mechanical simulation is used to determine the deformation and natural frequencies of the SARS-CoV-2 virus. The nonlocal elasticity theory is applied to account for the effect of interatomic forces. The results suggest that vibrating the virus at its natural frequencies could potentially destroy its protein chains. This research contributes to understanding the mechanical properties of the virus and finding non-vaccine treatment solutions.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2022)
Article
Mathematics, Applied
Hayri Metin Numanoglu, Hakan Ersoy, Bekir Akgoz, Omer Civalek
Summary: This study investigates the size-dependent thermo-mechanical vibration analysis of nanobeams by implementing Hamilton's principle and the stress equation of nonlocal elasticity theory. The finite element method is used to solve the eigenvalue problem and derive stiffness and mass matrices. Nonlocal finite element method is emphasized for analyzing the vibration behavior of nanobeams under different boundary conditions.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2022)
Article
Mechanics
Amin Alibakhshi, Shahriar Dastjerdi, Bekir Akgoz, Omer Civalek
Summary: This paper analyzes the size-dependent vibration of a dielectric elastomer microbeam resonator and investigates the influence of system parameters on its dynamic response. The results show the existence of chaos and quasiperiodicity and propose control methods for the chaotic motion.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Ahmed E. Abouelregal, Bekir Akgoz, Omer Civalek
Summary: An advanced model is developed to analyze the thermoelastic vibrations of a nonlocal isotropic solid medium subjected to a pulsed heat flux. The mathematical model is obtained by applying nonlocal elasticity theory and fractional calculus, and the Laplace transform technique is used for numerical solution. The parametric study shows that higher temperature reduces the thermal conductivity.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Amin Alibakhshi, Sasan Rahmanian, Shahriar Dastjerdi, Mohammad Malikan, Behrouz Karami, Bekir Akgoz, Omer Civalek
Summary: The paper proposes an efficient detection mechanism for scanning the surface profile of a micro-sample using cantilever-based atomic force microscopy (AFM) in non-contact mode. The mechanism utilizes the parametric resonance characteristics of the resonator and assumes a hyperelastic material for the microcantilever. The dynamics of the AFM are described by a nonlinear equation derived from extended Hamilton's principle, and a Galerkin method is used to discretize and solve the equation. The results show that the response amplitude significantly decreases when the resonator operates near twice the fundamental natural frequency and the sample's profile experiences a picometer-level depression. The proposed working principle based on principal parametric resonance is recommended for designing AFMs with ultra-high detection resolution.
Article
Engineering, Multidisciplinary
Shahriar Dastjerdi, Amin Alibakhshi, Bekir Akgoz, Omer Civalek
Summary: This paper applies a semi-analytical polynomial method (SAPM) to solve the mechanical governing equations of nano-sized spherical functionally graded structures. The SAPM is based on polynomial functions and assumes the spherical coordinate system. The results obtained are compared with those in other articles to examine the accuracy of the solution method.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Mathematics, Applied
Ahmed E. Abouelregal, Bekir Akgoz, Omer Civalek
Summary: The objective of this work is to improve a generalized thermoelastic heat transport framework, which is compatible with observable physical processes and allows speed reduction of heat waves within the solid. The proposed model can be used to derive alternative thermoelasticity models as special cases. The influence of Hall current on magneto-thermoelastic couplings in an infinite conducting viscoelastic medium with a cylindrical cavity under a strong magnetic field is also considered.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2023)
Article
Mechanics
Shahriar Dastjerdi, Mohammad Malikan, Bekir Akgoz, Omer Civalek, Victor A. Eremeyev
Summary: The research simulates the motion of the Earth's layers caused by internal pressures using an efficient mathematical model. By considering the Earth's rotation, the model provides more accurate results regarding the shape and displacement of the internal layers and tectonic plates. It also solves the fully nonlinear and dynamic differential equations using a semi-analytical polynomial method, which is an innovative and efficient approach.
JOURNAL OF APPLIED AND COMPUTATIONAL MECHANICS
(2023)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)
