Article
Materials Science, Multidisciplinary
Kushan Prasad Verma, Dipak Kumar Maiti
Summary: This paper investigates the geometrically nonlinear structural responses of ceramic-metal functionally graded shell panels under mechanical and thermal shocks. The study reveals that including geometric nonlinearity significantly affects the responses of the shell panel structures when the loading direction and the gradation direction are reversed.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Civil
Xuanhe Luo, Huanlin Zhou, Xinlian Ren, Zeng Meng
Summary: Functionally graded materials (FGMs) have attracted increasing interest in the aerospace industry due to their remarkable potential for thermal and mechanical applications. This study focuses on using FGMs in stiffened cylindrical shells (SCSs) to improve their heat resistance and bearing capacity. The research improves the smeared stiffener method (SSM) for the functional gradient stiffened cylindrical shell (FG-SCS) and obtains the analytical solution for its critical buckling load. Additionally, a new three-stage optimization framework based on the hybrid surrogate model and active learning strategy is proposed for the lightweight design of FG-SCSs. The evaluation of illustrative examples shows that FG-SCSs can significantly enhance bearing capacity under thermal environments, and the corresponding designs are highly competitive.
ENGINEERING STRUCTURES
(2023)
Article
Materials Science, Composites
Thi Phuong Nguyen, Minh Duc Vu, Van Doan Cao, Hoai Nam Vu
Summary: This article establishes an analytical approach to study the torsional postbuckling of functionally graded graphene-reinforced composite laminated circular cylindrical shells in a thermal environment. The effects of graphene-reinforced composite laminated stiffeners, temperature, and the volume fraction of graphene on the nonlinear torsional buckling behavior are numerically investigated.
POLYMER COMPOSITES
(2021)
Article
Computer Science, Interdisciplinary Applications
Aref Mehditabar, Gholam H. Rahimi
Summary: This paper investigates the ratcheting responses of functionally graded pipes under different loading conditions using nonlinear kinematic hardening rules. An implicit integration scheme is proposed for the complex constitutive models. The results demonstrate the significant influences of the hardening rules and FG inhomogeneity on the multiaxial ratcheting responses of the pipes.
ENGINEERING WITH COMPUTERS
(2021)
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
Acoustics
Yukun Chen, Guoyong Jin, Tiangui Ye, Heow Pueh Lee
Summary: A weak-form formulation for three-dimensional vibration analysis of rotating pre-twisted cylindrical isotropic and functionally graded shell panels is developed, with numerical verifications showing accurate prediction capabilities. Parametric studies are conducted to investigate the dynamic characteristics, with the developed model expected to serve as benchmarks for assessing other numerical and analytical models.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Multidisciplinary
Yan Niu, Minghui Yao, Qiliang Wu
Summary: This paper investigates the nonlinear vibration of a simply supported functionally graded graphene reinforced composite cylindrical panel under transverse excitation. Various models and methods are used to predict material properties and system responses, leading to results through parametric studies.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Mechanics
Minh-Chien Trinh, Seung-Eock Kim
Summary: This paper investigates the deterministic and stochastic dynamics of functionally graded composites in sandwich plates with four different layering configurations under thermomechanical loads for the first time. The study reveals that the plates exhibit dynamic hardening behaviors, and the presence of thermal loads results in more diverse random responses in stochastic environments. This work provides valuable insights into the deterministic and stochastic dynamics of composites, which are essential for practical engineering applications.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Xianjie Shi, Peng Zuo, Rui Zhong, Chenchen Guo, Qingshan Wang
Summary: In this article, an analytical model is proposed for vibration analysis of functionally graded conical-cylindrical coupled shell under thermal environment. The model utilizes artificial spring techniques to simulate boundary and coupling conditions, and employs a spectro-geometric method and Fourier harmonic functions to standardize displacement functions. The accuracy and stability of the model are demonstrated through comparison with existing data and finite element results.
THIN-WALLED STRUCTURES
(2022)
Article
Construction & Building Technology
Chanachai Thongchom, Thira Jearsiripongkul, Nima Refahati, Peyman Roudgar Saffari, Pouyan Roodgar Saffari, Sayan Sirimontree, Suraparb Keawsawasvong
Summary: This study investigates the acousto-structural behavior of a sandwich cylindrical shell with hexagonal honeycomb structures in its core and functionally graded porous layers on its outer and inner surfaces. An analytical model, considering the effect of external flow, is used to derive the vibro-acoustic equations and calculate the sound transmission loss (STL) through the structure. Parameters such as Mach number, wave approach angle, structure's radius, volume fraction, index of functionally graded material (FGM), and honeycomb properties are varied to study the acoustic property in the frequency domain. The results show good agreement with previous findings.
Article
Acoustics
J. Abdolhoseyni, M. Danesh
Summary: This article investigates the sound transmission characteristics of a smart functionally graded cylindrical shell equipped with magneto-electro-elastic patches in the presence of a steady fluid flow. The study shows that applying electric and magnetic fields in the low frequency band can improve the sound transmission loss, making the magneto-electro-elastic patches suitable for active structural acoustic control.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Thermodynamics
Jiao Li, Guangchun Wang, Shuai Liu, Jun Lin, Yanjin Guan, Guoqun Zhao, Hakim Naceur, Daniel Coutellier, Tao Wu
Summary: In this study, the thermal and mechanical properties of functionally graded material (FGM) were tailored to address the thermoelastic problem using a specific meshless smoothed particle hydrodynamics (SPH) method. The introduction of the symmetric SPH (SSPH) technique improved the inconsistency of the conventional SPH method, allowing for efficient solution of heat conduction and balance equations. The proposed approach was demonstrated to achieve result accuracy in solving numerical examples and consider the effect of gradation indexes on thermoelastic behavior.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Mechanics
G. G. Sheng, Yan Han, Zihang Zhang, Lei Zhao
Summary: This study investigates the nonlinear free and forced vibrations of functionally graded cylindrical microshells conveying viscous fluid, considering size effects and viscous forces. The critical flow velocity and natural frequency are obtained numerically, and the effects of axial load, scale parameter, fluid flow velocity and viscosity on nonlinear dynamic response are studied. Comparisons with inviscid case and previous literature are also discussed.
COMPOSITE STRUCTURES
(2021)
Article
Mathematics, Applied
Mohammad E. Golmakani, Elnaz Rahimi, Mostafa Sadeghian
Summary: This paper investigates the nonlinear bending behavior of functionally graded carbon nanotube-reinforced composite shell under thermomechanical loading. Mechanical properties of the constituents are obtained based on the modified rule of mixture, and equilibrium mathematical relations are derived using FSDT and von Karman nonlinearity. The impact of various parameters on the results is examined, with different nanotube distributions showing different deflections under specific boundary conditions.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2021)
Article
Engineering, Mechanical
Pham Thanh Hieu, Hoang Van Tung
Summary: This paper presents an analytical investigation on the buckling and postbuckling behavior of sandwich cylindrical shells comprising functionally graded material layers subjected to uniform temperature rise and external pressure in thermal environments. The effects of sandwich configurations, material gradation, tangential constraints of edges, and temperature dependence of material properties on buckling loads and postbuckling curves are analyzed through numerical examples.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Mechanics
Hoai Nam Vu, Thi Phuong Nguyen, Si Lanh Ho, Minh Duc Vu, Van Doan Cao
Summary: This paper investigates the buckling behavior of functionally graded graphene-reinforced composite (FG-GRC) laminated cylindrical shells under axial compression, considering the uniform temperature change effect. A stiffener design option for the FG-GRC cylindrical shells is presented, and a suitable smeared stiffener technique for the GRC laminated stiffener system is developed. The effects of GRC laminated stiffeners, temperature, and graphene-reinforced parameters on the compressed buckling behavior are validated.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Materials Science, Composites
Thi Phuong Nguyen, Minh Duc Vu, Thuy Dong Dang, Van Doan Cao, Thanh Hieu Pham, Hoai Nam Vu
Summary: The buckling and nonlinear postbuckling analysis of toroidal shell segments with auxetic-core layer and Graphene-reinforced polymer coatings under torsional loads is investigated in this research. The study reveals the significant effects of honeycomb lattice auxetic core, functionally graded Graphene-reinforced polymer coatings, and shell's geometric and foundation parameters on the nonlinear buckling behaviors of shells.
ADVANCED COMPOSITE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Cao Van Doan, Vu Tho Hung, Nguyen Thi Phuong, Vu Hoai Nam
Summary: In this study, a new algorithm is introduced to investigate the nonlinear buckling behavior of stiffened functionally graded graphene-reinforced composite laminated (FG-GRCL) toroidal shell segments in a thermal environment surrounded by an elastic foundation and subjected to torsional load. The algorithm considers the effects of temperature, stiffener system, geometrical parameters, and elastic foundation, and determines the critical buckling load and postbuckling torsional load-deflection curves by incorporating the effect of circumferential stress.
INTERNATIONAL JOURNAL OF COMPUTATIONAL MATERIALS SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Van Doan Cao, Hoai Nam Vu, Thi Phuong Nguyen
Summary: This paper proposes a new design for functionally graded graphene-reinforced composite laminated (FG-GRCL) toroidal shell segments in a thermal environment with a piezoelectric layer attached to the surface. The shells are reinforced by a FG-GRCL stringer and/or ring stiffener system. Nonlinear electro-thermo-torsional buckling and postbuckling behaviors of the shells are analyzed considering geometric nonlinearities described by von Karman and the classical Donnell thin shell theory. The effects of thermal load, graphene volume fraction and distribution type, piezoelectric layer, geometric parameters of the toroidal shell segments, and stiffeners on the torsional buckling load and postbuckling curves are investigated numerically.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Materials Science, Composites
Ngoc Ly Le, Tien Tu Bui, Thi Ngoc Thu Duong, Thuy Dong Dang, Minh Duc Vu, Thi Phuong Nguyen
Summary: The main aim of this research is to establish an algorithm for the nonlinear thermo-mechanical buckling of sandwich functionally graded graphene platelet reinforced composite (FG-GPLRC) shallow spherical caps and circular plates.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Engineering, Civil
Do Thi Kieu My, Vu Minh Duc, Nguyen Huu Giang, Nguyen Thi Phuong, Vu Hoai Nam
Summary: The nonlinear buckling behaviors of sandwich functionally graded graphene reinforced composite (FG-GRC) laminated toroidal shell segments with corrugated core under lateral pressure in thermal environment are reported in this study. The significant effects of corrugated core and FG-GRC laminated face sheets on nonlinear buckling behaviors of shells are presented.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Mathematics, Applied
Dang Thuy Dong, Nguyen Thi Phuong, Vu Hoai Nam, Le Ngoc Ly, Nguyen Van Tien, Vu Minh Duc, Tran Quang Minh, Vu Tho Hung, Nguyen Thi Huong Giang
Summary: The paper presents an analytical approach to study the post-buckling behavior of torsionally loaded sandwich carbon nanotube reinforced cylindrical shells with an auxetic core. Three layers of external and internal CNT reinforced layers and an auxetic lattice core are considered. The effects of different factors on the torsional buckling behavior are examined and discussed, including the carbon nanotube reinforced layers, the auxetic core layer, and the volume fraction of carbon nanotube.
ADVANCES IN APPLIED MATHEMATICS AND MECHANICS
(2023)
Article
Physics, Multidisciplinary
Nguyen Thi Phuong, Dang Thuy Dong, Cao Van Doan, Vu Hoai Nam
Summary: This paper investigates the buckling and postbuckling response of functionally graded graphene reinforced composite laminated cylindrical panels with stiffeners, resting on nonlinear elastic foundation and subjected to axial compression load with uniformly distributed temperature variation. The distribution laws of graphene with five types are studied, and suitable GRCL stiffeners are used for each graphene distributed type of panel. The fundamental equations for buckling and postbuckling are derived based on Reddy's higher-order shear deformation shell theory, the relations between strain and displacement, and the Galerkin method. The theoretical novelty lies in the novel technique for homogenization of the GRC laminated panel and stiffeners. The numerical results confirm the significant influences of GRC stiffeners and discuss the effects of material properties, geometrical properties, nonlinear foundation, and temperature.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Mechanics
Ngoc Ly Le, Thi Ngoc Thu Duong, Thuy Dong Dang, Minh Duc Vu, Tien Tu Bui, Thi Phuong Nguyen, Hoai Nam Vu
Summary: This paper presents a novel analytical approach for studying the nonlinear thermo-mechanical buckling of higher-order shear deformable porous circular plates and spherical caps with functionally graded material face sheets on Pasternak elastic foundation. The total potential energy expression of structures is established and the Ritz energy method is used to solve the problem. The relationships between external pressure-deflection, thermal load-deflection, and thermo-mechanical combined load-deflection are obtained using iterative algorithms. Numerical investigations are performed to analyze the critical buckling loads and postbuckling behavior of plates/caps, as well as the effects of foundation, porosity, and structure parameters on the thermo-mechanical responses.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2023)
Article
Engineering, Marine
Thi Phuong Nguyen, Thuy Dong Dang, Tien Tu Bui, Minh Duc Vu, Khuong Le-Nguyen, Thanh Hieu Pham, Hoai Nam Vu
Summary: An analytical approach is established for analyzing the nonlinear thermo-mechanical buckling of functionally graded graphene platelet reinforced composite circular plates and shallow spherical shells. The approach uses the higher-order shear deformation theory and the nonlinearities of von Karman. The study investigates the postbuckling response and critical buckling load of the structures by applying the Ritz energy method. The numerical results explore the special effects of different medium stiffnesses, material parameters, and geometrical dimensions on the nonlinear thermo-mechanical behavior of the plates and shells.
SHIPS AND OFFSHORE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Hoai Nam Vu, Thi Kieu My Do, Minh Duc Vu, Tho Hung Vu, Thanh Hieu Pham, Thi Phuong Nguyen
Summary: This paper presents the design of a torsion-loaded toroidal shell segment with two functionally graded carbon nanotube-reinforced composite coatings (FG-CNTRC) and a corrugated core. Both round and trapezoidal shapes of the corrugated core are considered. A homogenization model is applied to predict the stiffness of the corrugated core, and the total potential energy equation according to the Donnell shell theory is established. The Ritz energy method is used to determine the expressions of buckling and postbuckling responses. Numerical investigations demonstrate the significant beneficial effects of FG-CNTRC coatings and the corrugated core on the buckling responses of the shells.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
