The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
L W Zhang - One of the best experts on this subject based on the ideXlab platform.
-
on the study of the effect of in plane forces on the frequency parameters of cnt Reinforced Composite skew plates
Composite Structures, 2017Co-Authors: L W ZhangAbstract:Abstract This paper investigates the effect of in-plane forces on the vibration behavior of carbon nanotube (CNT) Reinforced Composite skew plates. The analysis is performed by implementing the first-order shear deformation theory (FSDT) with the element-free/mesh-free Improved Moving Least Square-Ritz (IMLS-Ritz) method for solution to the problem. Two varieties of carbon nanotube-Reinforced Composite skew plates, namely uniformly distributed and functionally graded reinforcement are considered. A micromechanical model is employed to estimate the material properties of CNT-Reinforced Composite plates. Comparison studies are implemented to validate the accuracy of the proposed method. The frequency parameters and mode shapes for the skew plates are presented. A detailed parametric study is carried out to reveal many complicated effect on the frequency parameters of the plate. These effects include in-plane stress ratio, boundary conditions, CNT-volume fraction and geometric size. The obtained results will be references of future research and corresponding engineering project.
-
an element free analysis of cnt Reinforced Composite plates with column supports and elastically restrained edges under large deformation
Composites Part B-engineering, 2016Co-Authors: L W Zhang, K.m. Liew, Z JiangAbstract:Abstract This paper presents a geometrically nonlinear analysis of carbon nanotube (CNT) Reinforced functionally graded Composite plates with elastically restrained edges and internal supports. The plate considered is of thin-to-moderate thickness undergoing large deflection; hence, the first-order shear deformation theory (FSDT) and von Karman assumption are adopted. The governing equation to this problem is derived through the IMLS-Ritz method. The CNT-Reinforced Composite plates considered are: (i) uniformly distributed; and (ii) functionally graded distributions of CNT reinforcement, in which the material properties of CNT-Reinforced Composite plates are functionally graded in the thickness direction. Several example problems with different types of internal supports and elastic edge restraints are studied. Results for isotropic cases are presented for the purpose of possible verification of the published solutions reported in the literature.
-
geometrically nonlinear large deformation analysis of functionally graded carbon nanotube Reinforced Composite straight sided quadrilateral plates
Computer Methods in Applied Mechanics and Engineering, 2015Co-Authors: L W Zhang, K.m. LiewAbstract:Abstract An improved moving least-squares (IMLS) approximation for the field variables is proposed for geometrically nonlinear large deformation analysis of functionally graded carbon nanotube (FG-CNT) Reinforced Composite quadrilateral plates. The plate considered is of moderate thickness and, hence, the first-order shear deformation theory (FSDT) and Von Karman assumption are adopted to incorporate the transverse shear strains, rotary inertia and moderate rotations. The CNTs are assumed to be uniaxially aligned in the axial direction and functionally graded in the plate thickness direction. The discrete nonlinear governing equation is derived based on the IMLS-Ritz method. The modified Newton–Raphson method combined with the arc-length iterative algorithm is employed to solve the nonlinear deformation of the FG-CNT Reinforced Composite quadrilateral plates. Improvements in computational efficiency and elimination of shear and membrane locking are achieved using a stabilized conforming nodal integration scheme to evaluate the system’s bending stiffness. Through detailed parametric studies, CNT distribution, CNTs volume fraction, aspect ratio and thickness-to-width ratio and different boundary conditions are demonstrated to effect significantly on the large deflection behaviors of the quadrilateral FG-CNT Reinforced Composite plates.
-
nonlinear bending analysis of fg cnt Reinforced Composite thick plates resting on pasternak foundations using the element free imls ritz method
Composite Structures, 2015Co-Authors: L W Zhang, Zhiguang Song, K.m. LiewAbstract:With very limited literature being available on the nonlinear bending behaviors of functionally graded carbon nanotube (FG-CNT) Reinforced Composite thick plates, this paper fills the apparent void by providing solutions to this problem based on the first-order shear deformation theory (FSDT). The plate considered rests on elastic foundations under transversely distributed loads. The analysis is carried out using the element-free IMLS-Ritz method. The arc-length iterative algorithm and the modified Newton–Raphson method are employed to obtain the nonlinear responses of FG-CNT Reinforced Composite plates. Convergence and comparison studies on a few example problems are performed to validate the numerical stability and accuracy of the IMLS-Ritz method. In this study, the characteristics of nonlinear bending influenced by foundation stiffness, transverse shear deformation, CNT distribution, CNT volume fraction and boundary conditions are examined.
-
an element free imls ritz framework for buckling analysis of fg cnt Reinforced Composite thick plates resting on winkler foundations
Engineering Analysis With Boundary Elements, 2015Co-Authors: L W Zhang, K.m. LiewAbstract:Abstract An element-free based improved moving least squares-Ritz (IMLS-Ritz) method is proposed to study the buckling behavior of functionally graded nanoComposite plates Reinforced by single-walled carbon nanotubes (SWCNTs) resting on Winkler foundations. The first-order shear deformation theory (FSDT) is employed to account for the effect of shear deformation of plates. The IMLS is used for construction of the two-dimensional displacement field. We derive the energy functional for moderately thick plates. By minimizing the energy functional via the Ritz method, solutions for the critical buckling load of the functionally graded carbon nanotube (FG–CNT) Reinforced Composite plates on elastic matrix are obtained. Numerical experiments are carried out to examine the effect of the Winkler modulus parameter on the critical buckling loads. The influences of boundary condition, plate thickness-to-width ratio, plate aspect ratio on the critical buckling loads are also investigated. It is found that FG–CNT Reinforced Composite plates with top and bottom surfaces of CNT-rich have the highest critical buckling loads.
K.m. Liew - One of the best experts on this subject based on the ideXlab platform.
-
Modeling of dynamic responses of CNT-Reinforced Composite cylindrical shells under impact loads
Computer Methods in Applied Mechanics and Engineering, 2016Co-Authors: Lu-wen Zhang, Z.g. Song, Pizhong Qiao, K.m. LiewAbstract:Abstract This paper investigates the impact responses of carbon nanotube (CNT) Reinforced functionally graded Composite cylindrical shells. The effective material properties of the CNT-Reinforced Composite cylindrical shell are modeled by the extended rule of mixture. Reddy’s high-order shear deformation theory is employed in the modeling, in which thermal effects are taken into account. In order to simulate the contact load, a linearized contact law is used to obtain a linearized contact coefficient. Fourier series expansion and Laplace transforms are utilized during the solving process. The analytical expression of transverse displacement is furnished, and the impact responses of CNT-Reinforced Composite cylindrical shell are analyzed. From the numerical results, it is observed that the amplitude of the impact responses of FG-X CNT-Reinforced Composite cylindrical shell is lower than that of the shell with FG-O and UD CNT-distributions. The increase in CNT volume fraction reduces the amplitude of the impact response. Meanwhile, temperature change affects both the material properties and stiffness of the structure. It is also observed that with an increased temperature, the impact amplitude of the cylindrical shell increases.
-
an element free analysis of cnt Reinforced Composite plates with column supports and elastically restrained edges under large deformation
Composites Part B-engineering, 2016Co-Authors: L W Zhang, K.m. Liew, Z JiangAbstract:Abstract This paper presents a geometrically nonlinear analysis of carbon nanotube (CNT) Reinforced functionally graded Composite plates with elastically restrained edges and internal supports. The plate considered is of thin-to-moderate thickness undergoing large deflection; hence, the first-order shear deformation theory (FSDT) and von Karman assumption are adopted. The governing equation to this problem is derived through the IMLS-Ritz method. The CNT-Reinforced Composite plates considered are: (i) uniformly distributed; and (ii) functionally graded distributions of CNT reinforcement, in which the material properties of CNT-Reinforced Composite plates are functionally graded in the thickness direction. Several example problems with different types of internal supports and elastic edge restraints are studied. Results for isotropic cases are presented for the purpose of possible verification of the published solutions reported in the literature.
-
geometrically nonlinear large deformation analysis of functionally graded carbon nanotube Reinforced Composite straight sided quadrilateral plates
Computer Methods in Applied Mechanics and Engineering, 2015Co-Authors: L W Zhang, K.m. LiewAbstract:Abstract An improved moving least-squares (IMLS) approximation for the field variables is proposed for geometrically nonlinear large deformation analysis of functionally graded carbon nanotube (FG-CNT) Reinforced Composite quadrilateral plates. The plate considered is of moderate thickness and, hence, the first-order shear deformation theory (FSDT) and Von Karman assumption are adopted to incorporate the transverse shear strains, rotary inertia and moderate rotations. The CNTs are assumed to be uniaxially aligned in the axial direction and functionally graded in the plate thickness direction. The discrete nonlinear governing equation is derived based on the IMLS-Ritz method. The modified Newton–Raphson method combined with the arc-length iterative algorithm is employed to solve the nonlinear deformation of the FG-CNT Reinforced Composite quadrilateral plates. Improvements in computational efficiency and elimination of shear and membrane locking are achieved using a stabilized conforming nodal integration scheme to evaluate the system’s bending stiffness. Through detailed parametric studies, CNT distribution, CNTs volume fraction, aspect ratio and thickness-to-width ratio and different boundary conditions are demonstrated to effect significantly on the large deflection behaviors of the quadrilateral FG-CNT Reinforced Composite plates.
-
nonlinear bending analysis of fg cnt Reinforced Composite thick plates resting on pasternak foundations using the element free imls ritz method
Composite Structures, 2015Co-Authors: L W Zhang, Zhiguang Song, K.m. LiewAbstract:With very limited literature being available on the nonlinear bending behaviors of functionally graded carbon nanotube (FG-CNT) Reinforced Composite thick plates, this paper fills the apparent void by providing solutions to this problem based on the first-order shear deformation theory (FSDT). The plate considered rests on elastic foundations under transversely distributed loads. The analysis is carried out using the element-free IMLS-Ritz method. The arc-length iterative algorithm and the modified Newton–Raphson method are employed to obtain the nonlinear responses of FG-CNT Reinforced Composite plates. Convergence and comparison studies on a few example problems are performed to validate the numerical stability and accuracy of the IMLS-Ritz method. In this study, the characteristics of nonlinear bending influenced by foundation stiffness, transverse shear deformation, CNT distribution, CNT volume fraction and boundary conditions are examined.
-
an element free imls ritz framework for buckling analysis of fg cnt Reinforced Composite thick plates resting on winkler foundations
Engineering Analysis With Boundary Elements, 2015Co-Authors: L W Zhang, K.m. LiewAbstract:Abstract An element-free based improved moving least squares-Ritz (IMLS-Ritz) method is proposed to study the buckling behavior of functionally graded nanoComposite plates Reinforced by single-walled carbon nanotubes (SWCNTs) resting on Winkler foundations. The first-order shear deformation theory (FSDT) is employed to account for the effect of shear deformation of plates. The IMLS is used for construction of the two-dimensional displacement field. We derive the energy functional for moderately thick plates. By minimizing the energy functional via the Ritz method, solutions for the critical buckling load of the functionally graded carbon nanotube (FG–CNT) Reinforced Composite plates on elastic matrix are obtained. Numerical experiments are carried out to examine the effect of the Winkler modulus parameter on the critical buckling loads. The influences of boundary condition, plate thickness-to-width ratio, plate aspect ratio on the critical buckling loads are also investigated. It is found that FG–CNT Reinforced Composite plates with top and bottom surfaces of CNT-rich have the highest critical buckling loads.
Deju Zhu - One of the best experts on this subject based on the ideXlab platform.
-
tensile behavior of glass fiber Reinforced Composite at different strain rates and temperatures
Construction and Building Materials, 2015Co-Authors: Deju ZhuAbstract:Abstract Glass fiber Reinforced Composite (GFRP) samples were tested at different strain rates from quasi-static up to 160 s −1 and temperatures from −25 to 100 °C to investigate any possible effects on their mechanical properties and failure patterns. The experimental results show that the tensile strength, maximum strain and toughness increase with increasing strain rates at room temperature, and the Young’s modulus, tensile strength and toughness decrease with increasing temperatures at the strain rate of 40 s −1 . Weibull statistics were used to quantify the degree of variability in the tensile strength and obtain Weibull parameters for numerical simulations and engineering applications.
S I Kundalwal - One of the best experts on this subject based on the ideXlab platform.
-
smart damping of fuzzy fiber Reinforced Composite plates using 1 3 piezoelectric Composites
Journal of Vibration and Control, 2016Co-Authors: S I Kundalwal, M C RayAbstract:This article is concerned with the investigation of active constrained layer damping (ACLD) of smart laminated fuzzy fiber Reinforced Composite (FFRC) plates. The distinctive feature of the constru...
Mostafa Faghih Shojaei - One of the best experts on this subject based on the ideXlab platform.
-
buckling and vibration analysis of embedded functionally graded carbon nanotube Reinforced Composite annular sector plates under thermal loading
Composites Part B-engineering, 2017Co-Authors: R Ansari, Jalal Torabi, Mostafa Faghih ShojaeiAbstract:Abstract The main objective of this paper is to present the buckling and vibration analysis of thermally pre-stressed functionally graded carbon-nanotube-Reinforced Composite (FG-CNTRC) annular sector plates resting on the elastic foundation via the variational differential quadrature (VDQ) method. The material properties of nanoComposite plate are considered to continuously vary across the thickness and are estimated according to the modified rule of mixture. The governing equations are derived on the basis of first order shear deformation theory. Applying two-dimensional generalized differential quadrature (GDQ) method, the energy functional of the structure is discretized. Then, based on Hamilton's principle and the VDQ method, the reduced forms of mass and stiffness matrices are obtained. After verifying the accuracy of the present method, comprehensive numerical results are presented to examine the effects of important parameters on the stability and vibrational behavior of the nanotube-Reinforced Composite annular sector plates. The results indicate that functionally graded distributions of CNTs in the thickness direction and the increase of elastic foundation coefficients can improve the stability of the structure.
