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Hong-liang Dai - One of the best experts on this subject based on the ideXlab platform.

  • Vibration and Transient Response of a FGM Hollow Cylinder.
    Mechanics of Advanced Materials and Structures, 2014
    Co-Authors: Hong-liang Dai, Yan-ni Rao
    Abstract:

    In this article, analysis of vibrations and transient responses of a Hollow Cylinder made of functionally graded materials (FGMs) under a radially symmetric dynamic load is presented. The material of the FGM Hollow Cylinder is assumed to be isotropic with constant Poisson's ratio, exponentially-varying elastic modulus, and exponentially-varying density through the radial thickness. By means of the finite difference method and Newmark method, the governing equation of the FGM Hollow Cylinder under dynamic loads is solved. As numerical examples, the FGM Hollow Cylinder under impulsive load and that under sinusoidally varying dynamic load are discussed, and then many valuable characteristics are revealed.

  • Dynamic Thermoelastic Behavior of a Double-layered Hollow Cylinder with an FGM Layer
    Journal of Thermal Stresses, 2013
    Co-Authors: Hong-liang Dai, Yan-ni Rao
    Abstract:

    In this article, dynamic thermoelastic behavior of a double-layered Cylinder with an FGM layer under mechanical and thermal loadings are investigated. The double-layered Hollow Cylinder is constructed by an FGM layer and a homogenous layer. Utilizing the Finite difference method and Newmark method, the governing equation of the double-layered Hollow Cylinder under both dynamic mechanical and thermal loads is solved. The accuracy of the approach is validated by comparing the results with the existing analytical ones. Numerical results show that volume exponent of the FGM layer, the thickness ratio of two layers and temperature change have significant effect on the dynamic behaviors of the double-layered Hollow Cylinder.

  • Dynamic response of a FGPM Hollow Cylinder under the coupling of multi-fields
    Applied Mathematics and Computation, 2012
    Co-Authors: Hui Xie, Hong-liang Dai, Zhi-yang Guo
    Abstract:

    Abstract An analytical study for dynamic electromagnetoelastic responses of a FGPM Hollow Cylinder, placed in an axial uniform magnetic field, subjected to mechanical loads and electric excitations is presented. The material properties assumed to vary through the radial thickness of the FGPM Hollow Cylinder according to the same power law function. Based on an interpolation method, by means of finite integral transforms, the numerical results of the dynamic responses of stresses, electric displacement, electric potential and perturbation of magnetic field vector are obtained. The result of investigation may be used as a reference to solve other transient coupled problems of electromagnetoelasticity.

  • Stresses distributions in a rotating functionally graded piezoelectric Hollow Cylinder
    Meccanica, 2011
    Co-Authors: Hong-liang Dai, Ting Dai, Hong-yan Zheng
    Abstract:

    An analytic solution to the axisymmetric problem of a long, radially polarized, Hollow Cylinder composed of functionally graded piezoelectric material (FGPM) rotating about its axis at a constant angular velocity is presented. For the case that electric, thermal and mechanical properties of the material obey different power laws in the thickness direction, distributions for radial displacement, stresses and electric potential in the FGPM Hollow Cylinder are determined by using the theory of electrothermoelasticity. Some useful discussions and numerical examples are presented to show the significant influence of material nonhomogeneity, and adopting suitable graded indexes and applying suitable geometric size and rotating velocity ω may optimize the rotating FGPM Hollow cylindrical structures. This will be of particular importance in modern engineering application.

  • analytical solution for electromagnetothermoelastic behaviors of a functionally graded piezoelectric Hollow Cylinder
    Applied Mathematical Modelling, 2010
    Co-Authors: Hong-liang Dai, Li Hong, Xia Xiao
    Abstract:

    Analytical study for electromagnetothermoelastic behaviors of a Hollow Cylinder composed of functionally graded piezoelectric material (FGPM), placed in a uniform magnetic field, subjected to electric, thermal and mechanical loads are presented. For the case that the electric, magnetic, thermal and mechanical properties of the material obey an identical power law in the radial direction, exact solutions for electric displacement, stresses, electric potential and perturbation of magnetic field vector in the FGPM Hollow Cylinder are determined by using the infinitesimal theory of electromagnetothermoelasticity. Some useful discussions and numerical examples are presented to show the significant influence of material inhomogeneity, and adopting a certain value of the inhomogeneity parameter β and applying suitable electric, thermal and mechanical loads can optimize the FGPM Hollow cylindrical structures. This will be of particular importance in modern engineering design.

X. Wang - One of the best experts on this subject based on the ideXlab platform.

  • Magnetoelastic Transient Stress and Perturbation of Magnetic Field Vector in a Laminated Hollow Cylinder
    Journal of Reinforced Plastics and Composites, 2007
    Co-Authors: Hong-liang Dai, X. Wang
    Abstract:

    An analytical method is presented to solve magnetoelastic wave propagation and perturbation of magnetic field vector in a laminated Hollow Cylinder with arbitrary thickness. The magnetoelastodynamic equation for each separate orthotropic Hollow Cylinder is solved by means of finite Hankel transforms and Laplace transforms. The unknown constants involved in the solution for each separate layer are determined by using the interface continuity conditions between layers and the boundary conditions at the internal and external boundaries of the laminated Hollow Cylinder. Thus an exact solution for magnetoelastic transient stresses and perturbation of magnetic field vector in the laminated Hollow Cylinder is obtained. From sample numerical calculations, it is seen that the present method is suitable to solve magnetoelastic transient problems of laminated Hollow Cylinders placed in an axial magnetic field, subjected to a radial shock load.

  • magneto thermo electro elastic transient response in a piezoelectric Hollow Cylinder subjected to complex loadings
    International Journal of Solids and Structures, 2006
    Co-Authors: Hong-liang Dai, X. Wang
    Abstract:

    Abstract The article presents an analytical solution for magneto–thermo–electro–elastic problems of a piezoelectric Hollow Cylinder placed in an axial magnetic field subjected to arbitrary thermal shock, mechanical load and transient electric excitation. Using an interpolation method solves the Volterra integral equation of the second kind caused by interaction among magnetic, thermal, electric and mechanical fields, the electric displacement is determined. Thus, the exact expressions for the transient responses of displacement, stresses, electric displacement, electric potential and perturbation of the magnetic field vector in the piezoelectric Hollow Cylinder are obtained by means of Hankel transforms, Laplace transforms, and inverse Laplace transforms. From sample numerical calculations, it is seen that the present method is suitable for a piezoelectric Hollow Cylinder subjected to arbitrary thermal shock, mechanical load and transient electric excitation, and the result carried out may be used as a reference to solve other transient coupled problems of magneto–thermo–electro–elasticity.

  • Magnetoelastodynamic stress and perturbation of magnetic field vector in an orthotropic laminated Hollow Cylinder
    International Journal of Engineering Science, 2006
    Co-Authors: Hong-liang Dai, X. Wang
    Abstract:

    An analytical method is presented to solve magneto-elastic wave propagation and perturbation of the magnetic field vector in an orthotropic laminated Hollow Cylinder with arbitrary thickness. The magnetoelastodynamic equation for each separate orthotropic Hollow Cylinder is solved by making use of finite Hankel transforms and Laplace transforms. The unknown constants involved in the solution for each separate layer are determined by using the interface continuity conditions between layers and the boundary conditions at the internal and external boundaries of the laminated Hollow Cylinders. Thus, an exact solution for magnetoelastodynamic stresses and perturbation response of an axial magnetic field vector in laminated Hollow Cylinder is obtained. From sample numerical calculations, it is seen that the present method is suitable to solve magnetoelastodynamic problems of laminated Hollow Cylinders subjected to a radial shock load and an axial magnetic field.

  • thermal shock in a Hollow Cylinder caused by rapid arbitrary heating
    Journal of Sound and Vibration, 1995
    Co-Authors: X. Wang
    Abstract:

    An effective method is presented for gaining the histories and distribution of the dynamic thermoelastic stress in a Hollow Cylinder subjected to rapid arbitrary heating. The general solution of the equilibrium displacement equation for the dynamic thermoelastic problem in a Hollow Cylinder is decomposed into a thermoelastic solution satisfying given boundary conditions and an elastic solution satisfying homogeneous Cauchy boundary conditions. Applying a finite Hankel transform [1], one easily obtains the exact solution for the transient waves caused by a sudden arbitrary heating shock.

N. W. Khobragade - One of the best experts on this subject based on the ideXlab platform.

Chuanqing Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Methodology for Establishing Comprehensive Stress Paths in Rocks During Hollow Cylinder Testing
    Rock Mechanics and Rock Engineering, 2018
    Co-Authors: Zhen Li, Hui Zhou, Yue Jiang, Dawei Hu, Chuanqing Zhang
    Abstract:

    We here systematically investigated the methodology for establishing comprehensive stress paths with the aim of developing Hollow Cylinder apparatuses for rock mechanics. The research was based on the stress combination in element of Hollow Cylinder sample with varied loading analysis treatment. For this purpose, we discussed the mechanism underlying the variations in principal stress magnitude and principal stress rotation. The orientation angle of the major principal stress was defined in an alternative prospect. Then a series of stress paths was introduced, including the hydrostatic pressure stress path, principal stress magnitude variation stress path on the deviatoric plane, pure principal stress rotation stress path, and the complex stress path coupling the variation in the magnitude of principal stress and principal stress rotation effect. The comprehensive stress paths were analyzed with rock mechanical theory and a mathematical approach. The suggested loading methods were examined using simulation loading tests, laboratory case tests and special case verification. The results showed successful completion of different stress paths. The proposed methodology was first investigated systematically in rock mechanics, contributing to development of the new Hollow Cylinder apparatus and complex rock engineering simulation.

Alain Ehrlacher - One of the best experts on this subject based on the ideXlab platform.

  • Mixed analytic/energetic approach for a sliding orthotropic Hollow Cylinder. Application to coil sagging
    International Journal of Solids and Structures, 2019
    Co-Authors: Daniel Weisz-patrault, Maxime Gantier, Alain Ehrlacher
    Abstract:

    This paper deals with the numerical simulation of coil sagging. This problem arises within the framework of the steel making industry where strips are wound on themselves for storage. Coil sagging is a major defect that can occur for recent grades undergoing phase transitions during the coiling process. The detailed mechanisms leading to coil sagging are still not well understood, making this phenomenon very difficult to prevent. The coil is a multilayer Hollow Cylinder where sliding takes place at each interface and significantly contributes to the overall deformation. However, a detailed numerical simulation addressing the contact problem, considering both pressure and sliding is difficult to perform under non-axisymmetric conditions. This paper presents a simplified approach considering an orthotropic Hollow Cylinder instead of a multilayer coil. The anisotropy is due to contact roughness that tends to decrease the radial stiffness. The Hollow Cylinder is subjected to gravity and an eigenstrain representing thermal expansion, phase transitions and transformation induced plasticity. Sliding at each interface is taken into account through a continuous plastic-like shear strain that is determined through an energetic principle. The proposed solution relies on analytical developments so that computation time is compatible with parametric studies. Results are addressed in order to give a better understanding of mechanisms and conditions under which coil sagging occur.