The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform

Roger T. Fenner - One of the best experts on this subject based on the ideXlab platform.

  • Boundary element analysis of heat conduction and thermal stresses in contact problems using independent meshing
    Computers & Structures, 1996
    Co-Authors: O. A. Olukoko, Adib A. Becker, Roger T. Fenner
    Abstract:

    Abstract This paper presents a new implementation of the boundary element method in contact problems involving heat conduction and thermal stresses. This formulation, which is an extension of the elastostatic contact formulation previously published by the present authors, allows independent meshing of the contact surfaces and frictional stick-slip. Three contact formulations for heat conduction problems are presented; a conventional Node-on-Node approach, a length mapping procedure and a Fictitious Node approach. The latter two approaches allow independent discretization of the contacting surfaces. The output from the heat conduction analysis is automatically fed into the elastic analysis as body forces in order to compute the thermal stresses and displacements. Several practical problems are presented and the results from the three approaches are shown to be in good agreement with each other and with other available solutions.

  • Independent meshing of contacting surfaces using Fictitious Nodes in boundary element analysis
    Computers & Structures, 1993
    Co-Authors: O. A. Olukoko, Adib A. Becker, Roger T. Fenner
    Abstract:

    Abstract A boundary element solution method for two-dimensional and axisymmetric contact problems with friction using a Fictitious-Node approach is presented. The algorithm is based on an independent discretization of the contacting surfaces by using the element shape functions to distribute the geometry on each contact element and introducing Fictitious Nodes within the interface in order to apply the contact constraints exactly. Frictional slipping is modelled according to Coulomb's law of friction, and the contact iterations are performed through an automatic iterative procedure. The approach is developed for contact problems under static and proportional loading conditions. Several examples are presented to demonstrate the accuracy of the algorithm.

Hui Zheng - One of the best experts on this subject based on the ideXlab platform.

  • A local radial basis function collocation method for band structure computation of 3D phononic crystals
    Applied Mathematical Modelling, 2020
    Co-Authors: Hui Zheng, Ch. Zhang, Zhenjun Yang
    Abstract:

    Abstract In this paper, we further extend the local radial basis function collocation method (LRBFCM) for efficient computation of band structures of phononic crystals from 2D to 3D. The proposed LRBFCM uses one Fictitious Node to tackle instability problems caused by calculation of derivatives of the wave pressure. A few examples of sound pressure wave propagation are modelled to validate the developed method. Comparisons with finite element modeling demonstrate the high stability and efficiency of the new method in computation of band structures of 3D phononic crystals.

  • a local radial basis function collocation method for band structure computation of phononic crystals with scatterers of arbitrary geometry
    Applied Mathematical Modelling, 2018
    Co-Authors: Hui Zheng, Zhenjun Yang, Chuanzeng Zhang, Mark Tyrer
    Abstract:

    Abstract A numerical algorithm based on the local radial basis function collocation method (LRBFCM) is developed to efficiently compute the derivatives of primary field quantities. Instead of a direct calculation of the derivatives by partial differentiation of the shape functions as in traditional numerical approaches, the derivative calculation in the present work is performed using a simple finite difference scheme with an introduced Fictitious Node. The developed algorithm is geometrically very flexible and can be easily applied to the continuity and boundary conditions of arbitrary geometries, which require an accurate derivative computation of the primary field quantities. The developed LRBFCM are applied to phononic crystals with scatterers of arbitrary geometry, which has not yet been reported before to the authors’ knowledge. A few examples for anti-plane elastic wave propagation are modelled to validate the developed LRBFCM. A comparison with finite element modelling shows that the present method is efficient and flexible.

O. A. Olukoko - One of the best experts on this subject based on the ideXlab platform.

  • Boundary element analysis of heat conduction and thermal stresses in contact problems using independent meshing
    Computers & Structures, 1996
    Co-Authors: O. A. Olukoko, Adib A. Becker, Roger T. Fenner
    Abstract:

    Abstract This paper presents a new implementation of the boundary element method in contact problems involving heat conduction and thermal stresses. This formulation, which is an extension of the elastostatic contact formulation previously published by the present authors, allows independent meshing of the contact surfaces and frictional stick-slip. Three contact formulations for heat conduction problems are presented; a conventional Node-on-Node approach, a length mapping procedure and a Fictitious Node approach. The latter two approaches allow independent discretization of the contacting surfaces. The output from the heat conduction analysis is automatically fed into the elastic analysis as body forces in order to compute the thermal stresses and displacements. Several practical problems are presented and the results from the three approaches are shown to be in good agreement with each other and with other available solutions.

  • Independent meshing of contacting surfaces using Fictitious Nodes in boundary element analysis
    Computers & Structures, 1993
    Co-Authors: O. A. Olukoko, Adib A. Becker, Roger T. Fenner
    Abstract:

    Abstract A boundary element solution method for two-dimensional and axisymmetric contact problems with friction using a Fictitious-Node approach is presented. The algorithm is based on an independent discretization of the contacting surfaces by using the element shape functions to distribute the geometry on each contact element and introducing Fictitious Nodes within the interface in order to apply the contact constraints exactly. Frictional slipping is modelled according to Coulomb's law of friction, and the contact iterations are performed through an automatic iterative procedure. The approach is developed for contact problems under static and proportional loading conditions. Several examples are presented to demonstrate the accuracy of the algorithm.

Zhenjun Yang - One of the best experts on this subject based on the ideXlab platform.

  • A local radial basis function collocation method for band structure computation of 3D phononic crystals
    Applied Mathematical Modelling, 2020
    Co-Authors: Hui Zheng, Ch. Zhang, Zhenjun Yang
    Abstract:

    Abstract In this paper, we further extend the local radial basis function collocation method (LRBFCM) for efficient computation of band structures of phononic crystals from 2D to 3D. The proposed LRBFCM uses one Fictitious Node to tackle instability problems caused by calculation of derivatives of the wave pressure. A few examples of sound pressure wave propagation are modelled to validate the developed method. Comparisons with finite element modeling demonstrate the high stability and efficiency of the new method in computation of band structures of 3D phononic crystals.

  • a local radial basis function collocation method for band structure computation of phononic crystals with scatterers of arbitrary geometry
    Applied Mathematical Modelling, 2018
    Co-Authors: Hui Zheng, Zhenjun Yang, Chuanzeng Zhang, Mark Tyrer
    Abstract:

    Abstract A numerical algorithm based on the local radial basis function collocation method (LRBFCM) is developed to efficiently compute the derivatives of primary field quantities. Instead of a direct calculation of the derivatives by partial differentiation of the shape functions as in traditional numerical approaches, the derivative calculation in the present work is performed using a simple finite difference scheme with an introduced Fictitious Node. The developed algorithm is geometrically very flexible and can be easily applied to the continuity and boundary conditions of arbitrary geometries, which require an accurate derivative computation of the primary field quantities. The developed LRBFCM are applied to phononic crystals with scatterers of arbitrary geometry, which has not yet been reported before to the authors’ knowledge. A few examples for anti-plane elastic wave propagation are modelled to validate the developed LRBFCM. A comparison with finite element modelling shows that the present method is efficient and flexible.

Adib A. Becker - One of the best experts on this subject based on the ideXlab platform.

  • Boundary element analysis of heat conduction and thermal stresses in contact problems using independent meshing
    Computers & Structures, 1996
    Co-Authors: O. A. Olukoko, Adib A. Becker, Roger T. Fenner
    Abstract:

    Abstract This paper presents a new implementation of the boundary element method in contact problems involving heat conduction and thermal stresses. This formulation, which is an extension of the elastostatic contact formulation previously published by the present authors, allows independent meshing of the contact surfaces and frictional stick-slip. Three contact formulations for heat conduction problems are presented; a conventional Node-on-Node approach, a length mapping procedure and a Fictitious Node approach. The latter two approaches allow independent discretization of the contacting surfaces. The output from the heat conduction analysis is automatically fed into the elastic analysis as body forces in order to compute the thermal stresses and displacements. Several practical problems are presented and the results from the three approaches are shown to be in good agreement with each other and with other available solutions.

  • Independent meshing of contacting surfaces using Fictitious Nodes in boundary element analysis
    Computers & Structures, 1993
    Co-Authors: O. A. Olukoko, Adib A. Becker, Roger T. Fenner
    Abstract:

    Abstract A boundary element solution method for two-dimensional and axisymmetric contact problems with friction using a Fictitious-Node approach is presented. The algorithm is based on an independent discretization of the contacting surfaces by using the element shape functions to distribute the geometry on each contact element and introducing Fictitious Nodes within the interface in order to apply the contact constraints exactly. Frictional slipping is modelled according to Coulomb's law of friction, and the contact iterations are performed through an automatic iterative procedure. The approach is developed for contact problems under static and proportional loading conditions. Several examples are presented to demonstrate the accuracy of the algorithm.