Article
Mechanics
Jiang Xu, Zhichun Yang, Jie Yang, Yinghui Li
Summary: This paper investigates the influence of boundary relaxation on the free vibration characteristics of a rotating composite laminated Timoshenko beam. Artificial springs are used to simulate the relaxed boundary conditions, adjusting the stiffness of the springs to obtain various relaxation conditions, with relaxation parameters introduced to evaluate the extent of boundary relaxation.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Ngoc-Duong Nguyen, Thien-Nhan Nguyen, Trung-Kien Nguyen, Thuc P. Vo
Summary: This paper introduces a simple two-variable shear deformation theory for functionally graded porous beams and investigates the effects of various factors on the frequency, buckling load, deflection, and stress of the beams. The theory considers different boundary conditions and porosity parameters to predict the behaviors of the beams.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Armagan Karamanli, Thuc P. Vo
Summary: This paper investigates the bending, vibration, and buckling analysis of carbon nanotube-reinforced composite (CNTRC) and graphene nanoplatelet-reinforced composite (GPLRC) beams. Finite element model is utilized to determine displacements, critical buckling loads, and natural frequencies with different boundary conditions, while exploring various factors such as distribution pattern, volume fraction of CNTs, GPL weight fraction, slenderness ratio, and boundary conditions. New results are provided as benchmarks for further validation.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Ngoc-Duong Nguyen, Trung-Kien Nguyen, Thuc P. Vo, Lieu B. Nguyen
Summary: This article proposes static, free vibration, and buckling analysis of thin-walled functionally graded (FG) sandwich and composite channel-section beams. Ritz's approximation functions are developed to solve the characteristic problems and numerical examples are presented to demonstrate the effects of various factors on the beams' performance.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Civil
Ngoc-Duong Nguyen, Thien-Nhan Nguyen, Trung-Kien Nguyen, Thuc P. Vo
Summary: This paper presents a novel approach for analysing the mechanical behaviours of functionally graded porous beams resting on a Winkler-Pasternak elastic foundation using high-order deformation theory. The governing equations are derived from the Lagrange principle. Legendre-Ritz polynomial functions are developed to solve the problem. The effects of various factors on the mechanical behaviours of porous beams are investigated, providing new benchmark results for future studies.
Article
Materials Science, Multidisciplinary
Huchhanagouda H. Patil, Jeyeraj Pitchaimani, M. A. Eltaher
Summary: This work investigates the buckling and vibration characteristics of axially functionally graded graphene platelet (GPL) composite beams exposed to axially varying loads (AVLs). Five types of axial grading GPLs subjected to six types of AVLs are studied using the Timoshenko beam theory. The effective elastic properties are obtained using the Halpin-Tsai model, and the equations of motion are solved using the Ritz method for buckling and vibration analysis. Parametric studies reveal the influences of grading pattern, load, GPL content, and structural boundary conditions on the beam's behavior. The study provides insights into the nature of graded distribution of GPLs for specific AVLs and aids in designing structural members.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Rajesh Kumar
Summary: This work presents an analytical investigation of pre-buckling vibration and buckling analyses of a composite skew plate subjected to parabolically and linearly varying in-plane edge load. The pre-buckling stresses within the composite skew plate are estimated using the Ritz method, and the total energy functional is derived for pre-buckling vibration and buckling problems. The linear eigenvalue problems are solved to compute the pre-buckling vibration frequency and buckling load of the stressed skew plate. The study provides crucial inputs in the design of skewed bridge decks, ship structures, and aircraft wing design.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Acoustics
Qikai Sun, Nan Zhang, Guobing Yan, Xinqun Zhu, Xiao Liu, Wangwang Li
Summary: The free vibration characteristics of steel-concrete composite continuous beams are analyzed through Euler-Bernoulli beam theory and a modified dynamic direct stiffness method, showing that stronger interfacial interaction leads to higher natural frequency values, along with larger steel subbeam and thinner concrete slab. Additionally, the number of spans does not influence natural frequency reduction, but equal total length with equal single-span length and different ratios of side span to main span are affected, only by bending stiffness, with a reasonable ratio of side span to main span being 0.9 to 1.0.
SHOCK AND VIBRATION
(2021)
Article
Construction & Building Technology
M. Alimoradzadeh, S. D. Akbas
Summary: This paper investigates the nonlinear free vibration and stability responses of a carbon nanotube reinforced composite beam under temperature rising. The material of the beam is considered as a polymeric matrix reinforced with single-walled carbon nanotubes according to different distributions with temperature-dependent physical properties. Using the Hamilton's principle, the governing nonlinear partial differential equation based on the Euler-Bernoulli beam theory is derived. The Von Karman nonlinearity is employed under the nonlinear kinematic assumption. The Galerkin's decomposition technique is used to discretize the governing equation and solved using the multiple time scale method. The critical buckling temperatures, nonlinear natural frequencies, and nonlinear free response of the system are obtained. The effect of different patterns of reinforcement on the critical buckling temperature, nonlinear natural frequency, nonlinear free response, and phase plane trajectory of the carbon nanotube reinforced composite beam investigated with temperature-dependent physical property.
STEEL AND COMPOSITE STRUCTURES
(2023)
Article
Mechanics
S. Jafroudi Nima, Rajamohan Ganesan
Summary: The proposed buckling solution accounts for prebuckling stress field heterogeneities overlooked in approximate analytical buckling solutions, by basing the analysis on a calculated prebuckling in-plane stress field. The study investigates the effect of in-plane constraints on plates' prebuckling and buckling behavior, as well as the influence of geometric configuration on buckling strength for selected symmetrical laminates through parametric studies.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Mechanics
Hulun Guo, Kun Huang, Zuxiang Lei
Summary: This article investigates the dynamic characteristics of graphene nanoplatelet (GPL) reinforced rotating laminated composite cantilever plates using the IMLS-Ritz method. The effects of various parameters on the natural frequencies are studied, and it is found that the addition of graphene nanoplatelets can increase the natural frequency of the cantilever plates. However, the increment of natural frequency decreases when the rotating speed is high enough.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Civil
Xiangying Guo, Yanmei Zhang, Zhong Luo, Dongxing Cao
Summary: The linear and nonlinear vibration characteristics of graphene platelet-reinforced composite (GPLRC) laminated plates are investigated. Energy expressions of the GPLRC laminates are established based on the first-order shear theory and von Karman geometric nonlinearity. The frequencies of the GPLRC laminated plate are calculated using the Rayleigh-Ritz method, and the nonlinear motion equations are obtained using Hamilton principle. The effects of different parameters on the frequency and nonlinear vibration characteristics are analyzed through numerical simulation.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
A. Milazzo, V. Oliveri
Summary: A new modeling approach for the buckling behavior of variable stiffness composite plates is proposed, and extensive studies are conducted on homogeneous and layered composite plates. The presence of cracks strongly influences the buckling behavior of the plates, and selecting appropriate fiber paths can enhance the performance.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
X. Li, Y. Qin, Z. H. Zhou
Summary: This paper investigates the coupled vibration behavior of rotating composite laminated beams under hygrothermal conditions. The governing equations for the coupled vibration considering hygrothermal effects and rotating motion are derived using the d'Alembert principle. The flapwise-edgewise coupled vibration characteristics of the beams are obtained using the Green's function method. A comprehensive parametric study on the natural frequencies of flapwise and edgewise bending vibrations is then performed. The results show that the flapwise-edgewise coupling factors are crucial for vibration analysis of high-speed rotating structures. Temperature variation, moisture concentration, rotating speed, and design parameters significantly influence the coupled vibration characteristics of the beams, and thermal expansion deformation cannot be neglected.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Engineering, Civil
Jian-Ping Lin, Kun Chen, Lei Zhang, Jingsi Huo, Rongqiao Xu, Guannan Wang
Summary: Displacement-based variational principles and composite finite elements (CFEs) are developed to simulate the vibration and buckling behavior of partial-interaction composite beams. The accuracy of the CFEs is validated and the impact of the independent-rotation assumption is investigated. The influence of sub-structure rotation on relative slips between sub-structures is discussed. The CFEs also consider internal degrees of freedom and avoid the shear/curvature locking phenomenon.
Article
Mechanics
Tolga Aksencer, Metin Aydogdu
COMPOSITE STRUCTURES
(2015)
Article
Mechanics
Tolga Aksencer, Metin Aydogdu
COMPOSITE STRUCTURES
(2018)
Article
Mechanics
Metin Aydogdu, Tolga Aksencer
COMPOSITE STRUCTURES
(2018)
Article
Nanoscience & Nanotechnology
Tolga Aksencer, Metin Aydogdu
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2011)
Article
Nanoscience & Nanotechnology
Tolga Aksencer, Metin Aydogdu
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2012)
Article
Engineering, Multidisciplinary
Metin Aydogdu, Tolga Aksencer, Kostas P. Soldatos
Summary: This study investigates the impact of fiber bending stiffness on the three-dimensional dynamic behavior of fibrous composites with embedded functionally graded stiff fibers. By using a computational efficient semi-analytical mathematical method, the study considers two types of possible inhomogeneous distributions of straight fibers and examines how they affect the dynamic behavior of the composite plate.
JOURNAL OF ENGINEERING MATHEMATICS
(2021)
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)