Article
Engineering, Civil
Sundaramoorthy Rajasekaran, Hossein B. Khaniki, Mergen H. Ghayesh
Summary: This paper investigates the static, stability, and free vibration behavior of multi-layer multi-directional functionally graded sandwich thin rectangular plates under thermo-mechanical loadings. Various physical properties and boundary conditions are considered, and the temperature-position-dependent physical properties are obtained using the rule of mixture. The modified differential quadrature method is used to model different types of plates. The results suggest that this methodology is effective, simple, and accurate. The study also presents the first investigation of MDFG plates and layered composite structures under thermo-mechanical conditions, and discusses the advantages of using MDFG sandwich plates.
THIN-WALLED STRUCTURES
(2022)
Article
Construction & Building Technology
Guermit Mohamed Bilal Chami, Amar Kahil, Lazre Hadji, Royal Madan, Abdelouah Tounsi
Summary: This study conducted free vibration analysis of multi-directional porous functionally graded sandwich plates, considering two cases: FG skin with homogeneous core and FG core with homogeneous skin. Hamilton's principle and Navier's technique were used to obtain the solution, and the results were validated with literature data. The findings indicate that multi-directional functionally graded structures perform better than uni-directional gradation.
STEEL AND COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Nuttawit Wattanasakulpong, Son Thai, Suppakit Eiadtrong
Summary: This study investigates the vibration and stability of sandwich skew plates with functionally graded porous cores, taking into account the significant effect of temperature rise. The critical buckling temperature and thermos-elastic vibration results were calculated using modified formulations for describing the temperature distributions across the plate. The study considers several important factors that have a considerable impact on the thermal stability and vibration of these plates, and the findings can serve as benchmark results for future studies.
Article
Engineering, Civil
Jing Zhao, Tianhao Wang, Xiaoguang Ma, Hui Li, Jinzhai Hu, Jincan Liu, Zhijiang Gao
Summary: This study proposes a novel method to improve the vibration characteristics of sandwich plates by introducing complementary effects of graphene and magnetorheological elastomer materials. By establishing a unified model and functional gradient material distribution curves, the internal and external factors affecting the complementary effects are investigated. The proposed method is verified to be convergent and accurate in numerical simulations.
ENGINEERING STRUCTURES
(2022)
Article
Mechanics
Supen Kumar Sah, Anup Ghosh
Summary: This article investigates the free vibration and buckling of multi-directional porous FGM sandwich plates, obtaining equilibrium equations based on sinusoidal shear deformation theory and using Navier's solution technique for simply supported cases. Different porous distribution models are considered for the FGM face sheets, and the influence of various factors on the natural frequency and critical buckling load of the sandwich plate is analyzed.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Nam Nguyen, Duc-Huynh Phan
Summary: Understanding nonlinear behavior in advanced engineering structures is crucial for analysis, design, and manufacturing processes. This paper focuses on exploring the nonlinear free vibrational characteristics of bi-directional functionally graded plates with internal pores under various conditions. An approximate numerical model is used to calculate the displacement field, and the nonlinearity in free vibration is assessed using an iterative scheme. Comprehensive parametric investigations are conducted to gain insight into the impact of various factors on the nonlinear free vibration characteristics of plate structures.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Physical
Tianhao Huang, Yu Ma, Tianyu Zhao, Jie Yang, Xin Wang
Summary: This paper conducts a free vibration analysis of a sandwich annular thin plate with whirl motion, taking into account the functionally graded core and distribution of graphene nanoparticles. The finite element method is used to verify the model and analyze the vibration. The effects of various factors on the free vibration behavior are examined in detail.
Article
Mechanics
Mohammad Hadi Karimi, Famida Fallah
Summary: The study investigates the nonlinear behavior of functionally graded sandwich circular sector plates under transverse loading using the first-order shear deformation theory with von Karman geometric nonlinearity. The effects of non-linearity, material constant, lay-up, and boundary conditions on bending of FG sandwich sector plates are studied. The results show that different configurations lead to different deflection and stress distributions in the plates.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
J. R. Cho
Summary: This paper presents a parametric investigation on the free-vibration behavior of functionally graded sandwich plates with a homogeneous core. The proposed numerical method, based on hierarchical models and the 2-D natural element method, shows good agreement with reference methods and provides consistent convergence to 3-D elasticity. The study reveals that the fundamental frequency of the sandwich plates is significantly influenced by the type of core material, volume fraction index, relative thickness and position of the core layer, and plate aspect ratio.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
Hui Li, Bocheng Dong, Jing Zhao, Zeyu Zou, Siqi Zhao, Qingshan Wang, Qingkai Han, Xiangping Wang
Summary: In this study, the nonlinear free vibration of functionally graded fiber-reinforced composite hexagon honeycomb sandwich cylindrical shells is investigated, taking into account the large-amplitude effect. An analytical model is proposed to describe the shell structures, and the governing equations are deduced based on the first-order shear deformation theory and von Kármán geometrical nonlinear relations. The frequency-amplitude relationships are obtained using the multiple scale expansion method. The study provides important conclusions on the nonlinear vibration characteristics of the structure through a parameter analysis.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Lazreg Hadji, Abdelouahed Tounsi
Summary: A higher-order shear deformation plate theory is proposed to study stress distribution and static deflections of functionally graded sandwich plates with porosity effects. The study aims to investigate the impact of porosity distribution on the bending behavior of simply supported functionally graded sandwich plates. Numerical results show the influence of porosity parameters, types, and aspect ratios on normal stress, shear stress, and static deflections, with comparison studies conducted to validate the formulations.
SMART STRUCTURES AND SYSTEMS
(2021)
Article
Mechanics
Tan-Tien Nguyen, Ngoc-Linh Nguyen, Jaehong Lee, Quoc-Hung Nguyen
Summary: The paper introduces an analysis of thin-walled functionally graded straight and curved beams for general non-uniform polygonal cross-sections in vibration problems, utilizing a higher order beam theory and beam frame modal approach. The study considers the effects of geometric parameters and material anisotropy, enabling analytical modeling for further extension, with numerical verification and examples based on benchmark problems and finite element software simulation. The analysis can be applied to general closed cross-section beams with arbitrary curvatures, with materials properties assumed to be graded across the wall thickness following a predefined shape function.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Ali Alnujaie, Atteshamuddin S. Sayyad, Lazreg Hadji, Abdelouahe Tounsi
Summary: This article investigates the buckling and free vibration of multi-directional functionally graded material (FGM) sandwich plates. By considering the continuous variation of material properties in different directions, the buckling and vibration characteristics of multi-directional FGM sandwich plates are analyzed. The results show that multi-directional FGM structures outperform uni-directional graded structures.
STRUCTURAL ENGINEERING AND MECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Shan Zeng, Zhangtao Peng, Kaifa Wang, Baolin Wang, Jinwu Wu, Tianxi Luo
Summary: This study presents a sandwich piezoelectric nano-energy harvester model based on NSGT, considering various factors affecting its natural frequency and voltage output. Results show that porous distributions, porosity coefficients, excitation frequencies, and axial loads have a significant impact on system performance.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Multidisciplinary
Behrouz Karami, Mergen H. Ghayesh
Summary: This work presents a study on the vibrations of sandwich microshells with porous functionally graded face sheets, considering the in-surface curvilinear motions. The motion equations are derived using the Hamilton principle with a curvilinear framework for the modified couple stress (MCS) scheme. The vibration modes and natural frequencies are obtained numerically, and the effects of different layer arrangements, material compositions, and porosity-type imperfections are investigated. The results are verified through comparison with an ANSYS model and other simplified versions.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
