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Hui-shen Shen - One of the best experts on this subject based on the ideXlab platform.
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postbuckling of sandwich plates with graphene reinforced composite face sheets in Thermal Environments
Composites Part B-engineering, 2018Co-Authors: Hui-shen Shen, Hai Wang, David HuiAbstract:Abstract Present investigation deals with the buckling and postbuckling behavior of a sandwich plate with a homogeneous core and graphene-reinforced composite (GRC) face sheets resting on an elastic foundation in Thermal Environments. The material properties of GRC face sheets are assumed to be piece-wise functionally graded by changing the volume fraction of graphene in the thickness direction. The material properties of both the homogeneous core layer and the GRC face sheets are assumed to be temperature-dependent, and are estimated by the extended Halpin-Tsai micromechanical model. The higher order shear deformation plate theory and the von Karman-type kinematic nonlinearity are used to derive the governing equations which account for the plate-foundation interaction and the Thermal effects. The buckling loads and the postbuckling equilibrium paths are obtained by using a two-step perturbation technique. The impacts of the distribution type of reinforcements, core-to-face sheet thickness ratio, plate aspect ratio, temperature variation, foundation stiffness and in-plane boundary conditions on the postbuckling behavior of sandwich plates with functionally graded GRC face sheets are studied in detail.
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nonlinear vibration of functionally graded graphene reinforced composite laminated cylindrical shells in Thermal Environments
Composite Structures, 2017Co-Authors: Hui-shen Shen, Yang XiangAbstract:Abstract This paper presents an investigation on the nonlinear vibration behavior of graphene-reinforced composite (GRC) laminated cylindrical shells in Thermal Environments. The material properties of the GRCs are temperature-dependent and the functionally graded (FG) materials concept is adopted which allows a piece-wise variation of the volume fraction of graphene reinforcement in the thickness direction of the shell. An extended Halpin-Tsaia micromechanical model is employed to estimate the GRC material properties. The motion equations for the nonlinear vibration of FG-GRC laminated cylindrical shells are based on the Reddy’s third order shear deformation theory and the von Karman-type kinematic nonlinearity, and the effects of Thermal conditions are included. The nonlinear vibration solutions for the FG-GRC laminated cylindrical shells can be obtained by applying a two-step perturbation technique. The results reveal that the nonlinear vibration characteristics of the shells are significantly influenced by the GRC material property gradient, the stacking sequence of the plies, the temperature variation, the shell geometric parameter and the shell end conditions.
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nonlinear vibration of functionally graded graphene reinforced composite laminated beams resting on elastic foundations in Thermal Environments
Nonlinear Dynamics, 2017Co-Authors: Hui-shen Shen, Feng Lin, Yang XiangAbstract:Modeling and nonlinear vibration analysis of graphene-reinforced composite (GRC) laminated beams resting on elastic foundations in Thermal Environments are presented. The graphene reinforcements are assumed to be aligned and are distributed either uniformly or functionally graded of piece-wise type along the thickness of the beam. The motion equations of the beams are based on a higher-order shear deformation beam theory and von Karman strain displacement relationships. The beam–foundation interaction and Thermal effects are also included. The temperature-dependent material properties of GRCs are estimated through a micromechanical model. A two-step perturbation approach is employed to determine the nonlinear-to-linear frequency ratios of GRC laminated beams. Detailed parametric studies are carried out to investigate the effects of material property gradient, temperature variation, stacking sequence as well as the foundation stiffness on the linear and nonlinear vibration characteristics of the GRC laminated beams.
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nonlinear vibration of functionally graded graphene reinforced composite laminated plates in Thermal Environments
Computer Methods in Applied Mechanics and Engineering, 2017Co-Authors: Hui-shen Shen, Yang XiangAbstract:Abstract This paper deals with the large amplitude vibration of functionally graded graphene-reinforced composite laminated plates resting on an elastic foundation and in Thermal Environments. The temperature-dependent material properties of piece-wise functionally graded graphene-reinforced composites (FG-GRCs) are assumed to be graded in the thickness direction of a plate, and are estimated through a micromechanical model. Based on a higher-order shear deformation plate theory, the motion equations are developed with geometric nonlinearity taking the form of von Karman strains. The plate–foundation interaction and Thermal effects are also included. The motion equations are then solved by a two-step perturbation technique to determine the nonlinear frequencies of the FG-GRC laminated plates. The numerical illustrations concern the nonlinear vibration characteristics of FG-GRC laminated plates under different sets of Thermal environmental conditions, from which results for uniformly distributed GRC laminated plates are obtained as comparators. The effects of distribution type of reinforcements, temperature variation, foundation stiffness and different in-plane boundary conditions are also investigated.
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Nonlinear vibration of FGM doubly curved panels resting on elastic foundations in Thermal Environments
Aerospace Science and Technology, 2015Co-Authors: Hui-shen Shen, Xiuhua Chen, Linzhi Wu, Xiao-lin HuangAbstract:Abstract A large amplitude vibration analysis is presented for a shear deformable doubly curved panel made of functionally graded materials (FGMs) resting on elastic foundations in Thermal Environments. The effective material properties are evaluated using the Mori–Tanaka micromechanics model. The formulations are based on a higher order shear deformation theory and von Karman strain–displacement relationships. The panel–foundation interaction and Thermal effects are also included. The temperature-dependent material properties of FGMs are assumed to be graded in the thickness direction according to a simple power law distribution. The motion equations are solved by a two-step perturbation approach to determine the nonlinear frequencies of the FGM doubly curved panel. The numerical illustrations cover small- and large-amplitude vibration characteristics of FGM doubly curved panels resting on elastic foundations of Pasternak-type. The results obtained from the Mori–Tanaka model are compared with those obtained from the Voigt model. The results confirm that in most cases Voigt model and Mori–Tanaka model have the same accuracy for predicting the vibration characteristics of FGM doubly curved panels. The effects of volume fraction index, temperature variation, foundation stiffness and panel curvature ratio on the nonlinear free vibration behaviors of FGM doubly curved panels are also discussed in detail.
Yang Xiang - One of the best experts on this subject based on the ideXlab platform.
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nonlinear vibration of functionally graded graphene reinforced composite laminated cylindrical shells in Thermal Environments
Composite Structures, 2017Co-Authors: Hui-shen Shen, Yang XiangAbstract:Abstract This paper presents an investigation on the nonlinear vibration behavior of graphene-reinforced composite (GRC) laminated cylindrical shells in Thermal Environments. The material properties of the GRCs are temperature-dependent and the functionally graded (FG) materials concept is adopted which allows a piece-wise variation of the volume fraction of graphene reinforcement in the thickness direction of the shell. An extended Halpin-Tsaia micromechanical model is employed to estimate the GRC material properties. The motion equations for the nonlinear vibration of FG-GRC laminated cylindrical shells are based on the Reddy’s third order shear deformation theory and the von Karman-type kinematic nonlinearity, and the effects of Thermal conditions are included. The nonlinear vibration solutions for the FG-GRC laminated cylindrical shells can be obtained by applying a two-step perturbation technique. The results reveal that the nonlinear vibration characteristics of the shells are significantly influenced by the GRC material property gradient, the stacking sequence of the plies, the temperature variation, the shell geometric parameter and the shell end conditions.
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nonlinear vibration of functionally graded graphene reinforced composite laminated beams resting on elastic foundations in Thermal Environments
Nonlinear Dynamics, 2017Co-Authors: Hui-shen Shen, Feng Lin, Yang XiangAbstract:Modeling and nonlinear vibration analysis of graphene-reinforced composite (GRC) laminated beams resting on elastic foundations in Thermal Environments are presented. The graphene reinforcements are assumed to be aligned and are distributed either uniformly or functionally graded of piece-wise type along the thickness of the beam. The motion equations of the beams are based on a higher-order shear deformation beam theory and von Karman strain displacement relationships. The beam–foundation interaction and Thermal effects are also included. The temperature-dependent material properties of GRCs are estimated through a micromechanical model. A two-step perturbation approach is employed to determine the nonlinear-to-linear frequency ratios of GRC laminated beams. Detailed parametric studies are carried out to investigate the effects of material property gradient, temperature variation, stacking sequence as well as the foundation stiffness on the linear and nonlinear vibration characteristics of the GRC laminated beams.
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nonlinear vibration of functionally graded graphene reinforced composite laminated plates in Thermal Environments
Computer Methods in Applied Mechanics and Engineering, 2017Co-Authors: Hui-shen Shen, Yang XiangAbstract:Abstract This paper deals with the large amplitude vibration of functionally graded graphene-reinforced composite laminated plates resting on an elastic foundation and in Thermal Environments. The temperature-dependent material properties of piece-wise functionally graded graphene-reinforced composites (FG-GRCs) are assumed to be graded in the thickness direction of a plate, and are estimated through a micromechanical model. Based on a higher-order shear deformation plate theory, the motion equations are developed with geometric nonlinearity taking the form of von Karman strains. The plate–foundation interaction and Thermal effects are also included. The motion equations are then solved by a two-step perturbation technique to determine the nonlinear frequencies of the FG-GRC laminated plates. The numerical illustrations concern the nonlinear vibration characteristics of FG-GRC laminated plates under different sets of Thermal environmental conditions, from which results for uniformly distributed GRC laminated plates are obtained as comparators. The effects of distribution type of reinforcements, temperature variation, foundation stiffness and different in-plane boundary conditions are also investigated.
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nonlinear bending of nanotube reinforced composite cylindrical panels resting on elastic foundations in Thermal Environments
Engineering Structures, 2014Co-Authors: Hui-shen Shen, Yang XiangAbstract:Abstract Nonlinear bending analysis is presented for nanocomposite cylindrical panels subjected to a transverse uniform or sinusoidal load resting on elastic foundations in Thermal Environments. Carbon nanotubes are used to reinforce the cylindrical panels in two distinguished patterns, namely, uniformly distributed (UD) and functionally graded (FG) reinforcements. The material properties of CNTRCs are assumed to be temperature-dependent and are estimated by a micromechanical model. The governing equations of the panel are derived based on a higher-order shear deformation theory with a von Karman-type of kinematic nonlinearity and are solved by a two-step perturbation technique. The nonlinear bending behaviors of the CNTRC panels with different CNT volume fraction distributions, foundation stiffnesses, temperature rise, and the character of in-plane boundary conditions are studied in details.
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postbuckling of axially compressed nanotube reinforced composite cylindrical panels resting on elastic foundations in Thermal Environments
Composites Part B-engineering, 2014Co-Authors: Hui-shen Shen, Yang XiangAbstract:This paper presents a postbuckling analysis of carbon nanotube-reinforced composite (CNTRC) cylindrical panels resting on elastic foundations and subjected to axial compression in Thermal Environments. The cylindrical panels are reinforced by aligned single-walled carbon nanotubes (SWCNTs) which are assumed to be functionally graded (FG) through the thickness direction with different types of distributions. The material properties of FG-CNTRC panels are estimated through an extended rule of mixture micromechanical model. The governing equations are based on a higher-order shear deformation theory with a von Karman-type of kinematic nonlinearity. The panel–foundation interaction and Thermal effects are also included and the material properties of CNTRCs are assumed to be temperature-dependent. A singular perturbation technique along with a two-step perturbation approach is employed to determine the buckling loads and postbuckling equilibrium paths. Numerical results reveal that the CNT volume fraction, temperature rise, foundation stiffness, and the panel geometric parameters have a significant effect on the buckling load and postbuckling behavior of CNTRC cylindrical panels. The results for uniformly distributed (UD) CNTRC cylindrical panels are compared with those of FG-CNTRC cylindrical panels. The results also confirm that for an CNTRC cylindrical panel with immovable unloaded straight edges, the postbuckling path of the panel is no longer the bifurcation type.
Zhen-xin Wang - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear analysis of shear deformable FGM beams resting on elastic foundations in Thermal Environments
International Journal of Mechanical Sciences, 2014Co-Authors: Hui-shen Shen, Zhen-xin WangAbstract:Abstract This paper deals with the large amplitude vibration, nonlinear bending and Thermal postbuckling of functionally graded material (FGM) beams resting on an elastic foundation in Thermal Environments. Two kinds of micromechanics models, namely, Voigt model and Mori-Tanaka model, are considered. The motion equations are based on a higher order shear deformation beam theory that includes beam–foundation interaction. The Thermal effects are also included and the material properties of FGMs are assumed to be temperature-dependent. The numerical illustrations concern the nonlinear vibration, nonlinear bending and Thermal postbuckling of FGM beams resting on Pasternak elastic foundations under different Thermal environmental conditions. It is found that the FGM beam with intermediate material properties does not necessarily have intermediate nonlinear frequencies. The Thermal postbuckling path of simply supported FGM beams is no longer of the bifurcation type for both uniform and non-uniform temperature fields.
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nonlinear dynamic response of nanotube reinforced composite plates resting on elastic foundations in Thermal Environments
Nonlinear Dynamics, 2012Co-Authors: Zhen-xin Wang, Hui-shen ShenAbstract:This paper presents an investigation on the nonlinear dynamic response of carbon nanotube-reinforced composite (CNTRC) plates resting on elastic foundations in Thermal Environments. Two configurations, i.e., single-layer CNTRC plate and three-layer plate that is composed of a homogeneous core layer and two CNTRC surface sheets, are considered. The single-walled carbon nanotube (SWCNT) reinforcement is either uniformly distributed (UD) or functionally graded (FG) in the thickness direction. The material properties of FG-CNTRC plates are assumed to be graded in the thickness direction, and are estimated through a micromechanical model. The motion equations are based on a higher-order shear deformation theory with a von Karman-type of kinematic nonlinearity. The Thermal effects are also included and the material properties of CNTRCs are assumed to be temperature-dependent. The equations of motion that includes plate-foundation interaction are solved by a two-step perturbation technique. Two cases of the in-plane boundary conditions are considered. Initial stresses caused by Thermal loads or in-plane edge loads are introduced. The effects of material property gradient, the volume fraction distribution, the foundation stiffness, the temperature change, the initial stress, and the core-to-face sheet thickness ratio on the dynamic response of CNTRC plates are discussed in detail through a parametric study.
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nonlinear vibration of nanotube reinforced composite plates in Thermal Environments
Computational Materials Science, 2011Co-Authors: Zhen-xin Wang, Hui-shen ShenAbstract:Abstract This paper deals with the large amplitude vibration of nanocomposite plates reinforced by single-walled carbon nanotubes (SWCNTs) resting on an elastic foundation in Thermal Environments. The SWCNTs are assumed aligned, straight and a uniform layout. Two kinds of carbon nanotube-reinforced composite (CNTRC) plates, namely, uniformly distributed (UD) and functionally graded (FG) reinforcements, are considered. The material properties of FG-CNTRC plates are assumed to be graded in the thickness direction, and are estimated through a micromechanical model. The motion equations are based on a higher-order shear deformation plate theory that includes plate-foundation interaction. The Thermal effects are also included and the material properties of CNTRCs are assumed to be temperature-dependent. The equations of motion are solved by an improved perturbation technique to determine nonlinear frequencies of CNTRC plates. Numerical results reveal that the natural frequencies as well as the nonlinear to linear frequency ratios are increased by increasing the CNT volume fraction. The results also show that the natural frequencies are reduced but the nonlinear to linear frequency ratios are increased by increasing the temperature rise or by decreasing the foundation stiffness. The results confirm that a functionally graded reinforcement has a significant effect on the nonlinear vibration characteristics of CNTRC plates.
Chenli Zhang - One of the best experts on this subject based on the ideXlab platform.
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prediction of nonlinear vibration of bilayer graphene sheets in Thermal Environments via molecular dynamics simulations and nonlocal elasticity
Computer Methods in Applied Mechanics and Engineering, 2013Co-Authors: Hui-shen Shen, Chenli ZhangAbstract:Nonlinear transverse vibration response is investigated for bilayer graphene sheets (BLGSs) in Thermal Environments by using molecular dynamics simulation and nonlocal elasticity. The BLGS is modeled as a nonlocal double-layered plate which contains small scale effect and van der Waals interaction forces. The geometric nonlinearity in the von Karman sense is adopted. The Thermal effects are included and the material properties are assumed to be size-dependent and temperature-dependent, and are obtained from molecular dynamics simulations. The small scale parameter e0a is estimated by matching the natural frequencies of graphene sheets observed from the molecular dynamics simulation results with the numerical results obtained from the nonlocal plate model. The results show that the stacking sequence has a small effect, while the aspect ratio has a moderate effect on the nonlinear vibration response of BLGSs. In contrast, the temperature change has a significant effect on the nonlinear vibration response of BLGSs. The results reveal that the small scale effect also plays an important role in the nonlinear vibration of BLGSs.
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nonlocal plate model for nonlinear bending of bilayer graphene sheets subjected to transverse loads in Thermal Environments
Composite Structures, 2013Co-Authors: Chenli ZhangAbstract:This paper investigates the nonlinear bending behavior of a single-layer rectangular graphene sheet subjected to a transverse uniform load in Thermal Environments. The single-layer graphene sheet (SLGS) is modeled as a nonlocal orthotropic plate which contains small scale effect. Geometric nonlinearity in the von Karman sense is adopted. The Thermal effects are included and the material properties are assumed to be size dependent and temperature dependent, and are obtained from molecular dynamics (MD) simulations. The small scale parameter e 0 a is estimated by matching the deflections of graphene sheets observed from the MD simulation results with the numerical results obtained from the nonlocal plate model. The numerical results show that the temperature change as well as the aspect ratio has a significant effect on the nonlinear bending behavior of SLGSs. The results reveal that the small scale parameter reduces the static large deflections of SLGSs, and the small scale effect also plays an important role in the nonlinear bending of SLGSs.
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nonlocal plate model for nonlinear bending of single layer graphene sheets subjected to transverse loads in Thermal Environments
Applied Physics A, 2011Co-Authors: Le Shen, Chenli ZhangAbstract:This paper investigates the nonlinear bending behavior of a single-layer rectangular graphene sheet subjected to a transverse uniform load in Thermal Environments. The single-layer graphene sheet (SLGS) is modeled as a nonlocal orthotropic plate which contains small scale effect. Geometric nonlinearity in the von Karman sense is adopted. The Thermal effects are included and the material properties are assumed to be size dependent and temperature dependent, and are obtained from molecular dynamics (MD) simulations. The small scale parameter e 0 a is estimated by matching the deflections of graphene sheets observed from the MD simulation results with the numerical results obtained from the nonlocal plate model. The numerical results show that the temperature change as well as the aspect ratio has a significant effect on the nonlinear bending behavior of SLGSs. The results reveal that the small scale parameter reduces the static large deflections of SLGSs, and the small scale effect also plays an important role in the nonlinear bending of SLGSs.
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nonlocal plate model for nonlinear vibration of single layer graphene sheets in Thermal Environments
Computational Materials Science, 2010Co-Authors: Le Shen, Hui-shen Shen, Chenli ZhangAbstract:Abstract Nonlinear vibration behavior is presented for a simply supported, rectangular, single layer graphene sheet in Thermal Environments. The single layer graphene sheet is modeled as a nonlocal orthotropic plate which contains small scale effects. The nonlinear vibration analysis is based on thin plate theory with a von Karman-type of kinematic nonlinearity. The Thermal effects are also included and the material properties are assumed to be temperature-dependent and are obtained from molecular dynamics simulations. The small scale parameter e 0 a is estimated by matching the natural frequencies of graphene sheets observed from the MD simulation results with the numerical results obtained from the nonlocal plate model. The results show that with properly selected small scale parameters and material properties, the nonlocal plate model can provide a remarkably accurate prediction of the graphene sheet behavior under nonlinear vibration in Thermal Environments.
B. N. Singh - One of the best experts on this subject based on the ideXlab platform.
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stochastic perturbation based finite element for buckling statistics of fgm plates with uncertain material properties in Thermal Environments
Composite Structures, 2014Co-Authors: Mohammad Talha, B. N. SinghAbstract:In the present study, stochastic perturbation-based finite element for buckling statistics of functionally graded plates (FGM) with uncertain material properties in Thermal Environments is investigated. The effective material properties of the gradient plates are assumed to be temperature-dependent and vary in the thickness direction only according to the power-law distribution of the volume fractions of the constituents. An improved structural kinematics proposed earlier by author’s is employed which accounts parabolic variations for the transverse shear strains with stress free boundary conditions at the top and bottom faces of the plate. An efficient C0 stochastic finite element based on the first-order perturbation technique (FOPT) is proposed, and the fundamental equations are obtained using variational approach. Convergence and comparison studies have been performed to describe the efficiency of the present formulation. The numerical results are highlighted with different system parameters and boundary conditions.
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Stochastic nonlinear free vibration of laminated composite plates resting on elastic foundation in Thermal Environments
Computational Mechanics, 2009Co-Authors: B. N. SinghAbstract:This paper presents the nonlinear free vibration analysis of laminated composite plates resting on elastic foundation with random system properties in Thermal Environments. System parameters are modeled as basic random variables for accurate prediction of system behavior. A C ^0 nonlinear finite element based on HSDT in von Karman sense is used to descretize the laminate. A direct iterative method in conjunction with first-order perturbation technique is outlined and applied to solve the stochastic nonlinear generalized eigenvalue problem. The developed stochastic procedure is successfully used for Thermally induced nonlinear free vibration problem with a reasonable accuracy. Numerical results for various combinations of boundary conditions, geometric parameters, amplitude ratios, foundation parameters and Thermal loading have been compared with those available in literature and an independent MCS. Some new results are also presented which clearly demonstrate the importance of the randomness in the system parameters on the response of the structures.
