Article
Mechanics
Quoc-Hoa Pham, Phu-Cuong Nguyen
Summary: This paper analyzes the dynamic stability behaviors of porous functionally graded microplates using a refined plate theory and modified couple stress theory within an isogeometric analysis framework. The effects of microstructure are captured by employing only one material length scale parameter. Numerical investigations are carried out to study the influences of factors such as porosity coefficient and distribution, material length scale, and load factors on dynamic instability characteristics.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
H. Pham-Tan, Chien H. Thai, P. Phung-Van
Summary: In this article, the free vibration, bending, and transient analyses of the porous metal foam plate using isogeometric analysis are investigated. The effects of different parameters on the frequencies, deflections, and dynamic responses of the plate are studied. Key findings can be given for manufacturing metal foam structures.
THIN-WALLED STRUCTURES
(2022)
Article
Mathematics, Applied
Rui Song, S. Sahmani, B. Safaei
Summary: This study investigates the thermal postbuckling characteristics of a PFGM microplate with various central cutout shapes using isogeometric numerical technique. The results show that the effects of size dependency decrease as the thermal postbuckling regime deepens, while the central cutout has a significant impact on the temperature rise in the absence of nonlocality and inclusion of strain gradient size effects.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2021)
Article
Computer Science, Interdisciplinary Applications
P. T. Hung, Chien H. Thai, P. Phung-Van
Summary: The classical continuum mechanics theory cannot account for size effects, so the modified strain gradient theory (MSGT) is used instead. Isogeometric approach (IGA) is a computational technique capable of accurately solving complex problems. Therefore, a size-dependent analysis of carbon nanotube-reinforced magneto-electric-elastic microplates based on MSGT is proposed. The refined plate theory (RPT) with four variables, MSGT, and IGA are used in this approach. The influence of various factors on the deflection and natural frequency of the microplates, such as length scale parameters, carbon nanotube distributions, volume fractions, magnetic potential, electric voltage, and geometry, are studied and discussed.
COMPUTERS & STRUCTURES
(2023)
Article
Engineering, Civil
Chang Tao, Ting Dai
Summary: This paper investigates the nonlinear static bending and dynamic transient responses of rectangular and circular sandwich microplates. The results reveal that increasing the material length scale parameter and volume fraction index of graphene nanofillers leads to reductions in deflections and periods of motion.
THIN-WALLED STRUCTURES
(2022)
Article
Physics, Multidisciplinary
Duquan Zuo, Saeid Sahmani, Babak Safaei, Guoling Ma
Summary: In this study, the isogeometric numerical solving process incorporating non-uniform rational B-splines is used to analyze the size-dependent thermal postbuckling behavior of porous FG microplates with different central cutout shapes. The results show that the gap between thermal postbuckling equilibrium paths under couple stress is slightly higher than the classical approach. A central cutout changes the trend of the load-deflection response, reducing the initial thermal postbuckling strength but enhancing the microplate strength in the deep thermal postbuckling region.
WAVES IN RANDOM AND COMPLEX MEDIA
(2021)
Article
Engineering, Aerospace
Nam V. Nguyen, Duc-Huynh Phan
Summary: This study investigates the dynamic instability behavior of advanced sandwich plate structures subjected to periodic in-plane compressive loads using a computational approach based on a refined quasi-3D plate theory and NURBS-based isogeometric analysis. The findings provide new insights into the dynamic instability behavior of sandwich plates and suggest careful evaluation of the thickness stretching effect for moderate to thick plate structures.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Mathematics, Applied
Duquan Zuo, B. Safaei, S. Sahmani, Guoling Ma
Summary: The present numerical analysis aims to predict the nonlinear frequency ratios of porous composite plates at microscale in the presence of different microstructural gradient tensors. Isogeometric models of porous composite microplates are obtained with and without a central cutout, considering various porosity patterns and refined shear deformable plate formulation. The results show that different gradient tensors have different effects on the reduction of frequency ratio, and this effect is slightly decreased when changing the boundary conditions.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2022)
Article
Engineering, Civil
Rui Rao, Saeid Sahmani, Babak Safaei
Summary: By utilizing the isogeometric finite element methodology, this study predicts the nonlinear flexural response of composite microplates with functionally graded porosity, incorporating couple stress small scale effect. A refined power-law function is used to consider porosity dependency and material gradient simultaneously. The influence of couple stress on the nonlinear bending curves of porous FG composite microplates is demonstrated, showing a significant impact on the through-thickness porosity distribution schemes. The presence of a cutout at the center of composite microplates alters the slope of their nonlinear flexural curve.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Mechanics
Fan Fan, Xiumei Cai, Saeid Sahmani, Babak Safaei
Summary: In this study, a surface elastic-based three-dimensional nonlinear formulation was used to explore the thermal postbuckling characteristics of porous composite nanoplates made of functionally graded materials (FGM). The study found that for higher material gradient indexes, the surface stress size dependency plays a more important role in the thermal postbuckling.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Xianbo Sun, Ruxin Gao, Yahui Zhang
Summary: A systematic spectral stochastic isogeometric analysis (SSIGA) process is proposed for the static bending and free vibration analyses of functionally graded (FG) plates with 3D random porosity. The porosity is modeled as a Beta random field represented compactly via the Karhunen-Loeve expansion. A novel hierarchical locking-free quasi-3D shear deformation theory, called spectral displacement formulation (SDF), is introduced. Isogeometric analysis is utilized to meet the C 1-continuity requirement of the SDF. The response surfaces of the porous FG plates are constructed non-invasively by the spectral collocation method, and a new spectral stochastic post-processing process is developed. Numerical examples demonstrate the effectiveness of the SSIGA process and investigate the influences of the RPF parameters and gradient index on the response statistics. (c) 2022 Elsevier Inc. All rights reserved.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Civil
Yaqiang Xue, Guoyong Jin, Chunyu Zhang, Xiaohan Han, Jie Chen
Summary: This paper investigates the free vibration behaviors of functionally graded porous (FGP) cylindrical panels and shells. New distribution types along the length direction are considered for the first time. The isogeometric analysis (IGA) method is applied to solve this problem, and the accuracy is examined compared to published data. The results provide benchmark solutions for other algorithm research and guidelines for designing FGP structures.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Aerospace
Nam V. Nguyen, Kim Q. Tran, P. Phung-Van, Jaehong Lee, H. Nguyen-Xuan
Summary: In this study, an efficient numerical framework is proposed to explore the responses of functionally graded triply periodic minimal surface (FG-TPMS) microplates. The static bending, free vibration, and buckling characteristics of these structures are thoroughly presented for the first time. The study utilizes refined plate theory and isogeometric analysis to study these mechanical responses. It also takes into account the size effect with the modified couple stress theory. The findings contribute to the development and application of TPMS geometry in microscale structures.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Jianhui Qiu, Saeid Sahmani, Babak Safaei
Summary: In this study, a nonlinear postbuckling analysis for microplates made of a porous functionally graded material (PFGM) is performed using the modified couple stress theory of elasticity (MCSTE). The effective mechanical properties of PFGM microplates are extracted using a power-law function that incorporates porosity dependency and material gradient. The non-uniform rational B-spline (NURBS)-based isogeometric analytical method is employed for effective discretization. It is found that the gap between equilibrium paths decreases as the postbuckling regime progresses, and the effect of couple stress size becomes more significant for certain porosity and material property gradient index values, especially for higher maximum deflection values.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Aerospace
Nam V. Nguyen, Duc-Huynh Phan, Jaehong Lee
Summary: The main contribution of this study is the development of an efficient numerical model to investigate the size-dependent geometrically nonlinear static and dynamic characteristics of functionally graded microplates reinforced by graphene nanofillers. The model utilizes modified couple stress theory to capture the size-dependent effect and employs four-variable refined plate theory and isogeometric analysis to calculate the displacement field of small-scale structures. The study examines the dispersion patterns of graphene-based nanofillers and analyzes the response of microplate models under various static or dynamic loads. Nonlinear governing equations of motion are solved using the Newton-Raphson iterative procedure and Newmark's time integration scheme. Additionally, the study incorporates Rayleigh damping to explore its influence on the oscillations of functionally graded microplates reinforced by graphene nanofillers. Numerical examples are conducted to investigate the effects of significant parameters on the geometrically nonlinear behaviors of the microplates.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
P. Phung-Van, Chien H. Thai
Summary: This paper introduces a novel nonlocal strain gradient isogeometric model for functionally graded carbon nanotube-reinforced composite nanoplates, capturing both nonlocal effects and strain gradient effects. The model is based on higher-order shear deformation theory and virtual work principle, and is analyzed using isogeometric analysis to study the deflection and natural frequency of nanoplates. The effects of nonlocal parameter, strain gradient parameter, CNT volume fraction, CNT distributions, and length-to-thickness ratios on deflection and natural frequency are examined through numerical results. Stiffness-softening and stiffness-hardening mechanisms are shown by the present model.
ENGINEERING WITH COMPUTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Lieu B. Nguyen, Chien H. Thai, Ngoc Duong-Nguyen, H. Nguyen-Xuan
Summary: This study presents a method using modified strain gradient theory and higher-order shear deformation theory to study the electromechanical vibration analysis of functionally graded piezoelectric porous microplates for the first time. The study considered two porosity distribution types and investigated the effects of external electric voltages, power-law index, porosity coefficient, porosity distribution, and various boundary conditions on the natural frequencies of the microplates through numerical analysis.
ENGINEERING WITH COMPUTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Chien H. Thai, H. Nguyen-Xuan, Lieu B. Nguyen, P. Phung-Van
Summary: A size-dependent moving Kriging meshfree approach is proposed for analyzing bending, free vibration, and buckling of functionally graded microplates. The study uses virtual work principle, mixed rule for material properties, and refined plate theory to determine displacement, natural frequencies, and buckling loads of FG microplates. Results demonstrate that natural frequencies, buckling loads, and displacements of FG microplates are influenced by geometrical parameters, boundary conditions, and length-scale parameters.
ENGINEERING WITH COMPUTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Chien H. Thai, A. J. M. Ferreira, H. Nguyen-Xuan, Lieu B. Nguyen, P. Phung-Van
Summary: This paper proposes a nonlocal strain gradient meshfree plate approach for the bending and free vibration analyses of laminated composite and sandwich nanoplates. The deflection and natural frequency of the plates are significantly influenced by the nonlocal and strain gradient parameters. The results show that both models coincide when the nonlocal and strain gradient parameters are taken as zero.
ENGINEERING WITH COMPUTERS
(2023)
Article
Computer Science, Interdisciplinary Applications
Chien H. Thai, H. Nguyen-Xuan, P. Phung-Van
Summary: This paper presents a size-dependent high-order shear deformation theory (HSDT) model for analyzing the static and free vibration of laminated composite and sandwich nanoplates. By introducing scale parameters, the size effect of nanostructures is considered, and a virtual work principle is used to establish the bending and free vibration analysis model. The results show that the characteristics of the nanostructures are influenced by the geometry, boundary condition, length-to-thickness ratio, strain gradient parameter, and nonlocal parameter.
ENGINEERING WITH COMPUTERS
(2023)
Article
Engineering, Civil
H. Pham-Tan, Chien H. Thai, P. Phung-Van
Summary: In this article, the free vibration, bending, and transient analyses of the porous metal foam plate using isogeometric analysis are investigated. The effects of different parameters on the frequencies, deflections, and dynamic responses of the plate are studied. Key findings can be given for manufacturing metal foam structures.
THIN-WALLED STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
P. Phung-Van, H. Nguyen-Xuan, Chien H. Thai
Summary: This paper investigates the free vibration analysis of functionally graded graphene platelet-reinforced composites (FG GPLRC) plates using a nonlocal strain gradient isogeometric model based on the higher order shear deformation theory. Various distributed patterns of graphene platelets (GPLs) are considered, and the effects of different parameters on the natural frequencies of the nanoplates are examined. The results obtained in this study can serve as benchmark results for further research on FG GPLRC nanoplates.
ENGINEERING WITH COMPUTERS
(2023)
Article
Engineering, Aerospace
P. T. Hung, Chien H. Thai, P. Phung-Van
Summary: This research examines the natural vibration analysis of magneto-electro-elastic functionally graded porous plates using a moving Kriging meshfree method. The study investigates the impact of porosity distribution, porosity volume fraction, volume fraction index, initial external electric voltage, initial magnetic potential, and geometry on the natural frequency of the plates. The numerical results provide an effective approach to analyze and calculate the natural vibration of these plates.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Lieu B. Nguyen, H. Nguyen-Xuan, Chien H. Thai, P. Phung-Van
Summary: This paper presents a size-dependent isogeometric analysis approach for modeling smart functionally graded porous nanoscale plates made of two piezoelectric materials. The nonlocal elasticity theory is employed to consider size-dependent effects and the governing equations are obtained using a combination of higher-order shear deformation theory and non-uniform rational B-splines formulations. The paper investigates the influences of various factors on the natural frequencies of the smart nanoplate and compares the results with published documents, showing the reliability and effectiveness of the proposed method.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2023)
Article
Engineering, Mechanical
P. T. Hung, P. Phung-Van, Chien H. Thai
Summary: This article investigates the free vibration and buckling analyses of magneto-electro-elastic functionally graded (MEE FG) microplates in a thermal environment. The MEE FG microplate consists of piezoelectric and piezomagnetic materials distributed across the thickness direction based on the power law model. The modified strain gradient theory (MSGT) combined with the generalized higher-order shear deformation theory (HSDT) is used to accurately capture the small effects on microstructures.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2023)
Article
Engineering, Civil
Chien H. Thai, P. T. Hung, H. Nguyen-Xuan, P. Phung-Van
Summary: In this paper, a new size-dependent meshfree method is introduced to analyze the free vibrations of magneto-electro-elastic (MEE) functionally graded (FG) nanoplates. The method combines the nonlocal strain gradient theory (NSGT), the higher-order shear deformation theory (HSDT), and meshfree method for the first time. The effective material properties of MEE-FG nanoplates are expressed using a power-law scheme. Numerical examples are given to investigate the effect of various parameters on the natural frequency of MEE-FG nanoplates.
ENGINEERING STRUCTURES
(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)
