The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform

Chen Wanji - One of the best experts on this subject based on the ideXlab platform.

  • refined nine parameter triangular thin plate bending element by using refined Direct Stiffness Method
    International Journal for Numerical Methods in Engineering, 1995
    Co-Authors: Y K Cheung, Chen Wanji
    Abstract:

    Based on a new generalized variational principle, a refined Direct Stiffness Method (RDSM) which can be Directly used to improve non-conforming elements is proposed. The formulation is similar to that of the Direct Stiffness Method (DSM), but the constraint condition of interelement continuity is satisfied in an average sense and as a result convergence and high accuracy are insured. The well-known BCIZ nine-parameter triangular thin plate bending element is refined by the RDSM to yield a new nine-parameter thin plate bending element RT 9 . Numerical examples are presented to show that the present model passes the patch test and possesses high accuracy

  • Refined nine‐parameter triangular thin plate bending element by using refined Direct Stiffness Method
    International Journal for Numerical Methods in Engineering, 1995
    Co-Authors: Y K Cheung, Chen Wanji
    Abstract:

    Based on a new generalized variational principle, a refined Direct Stiffness Method (RDSM) which can be Directly used to improve non-conforming elements is proposed. The formulation is similar to that of the Direct Stiffness Method (DSM), but the constraint condition of interelement continuity is satisfied in an average sense and as a result convergence and high accuracy are insured. The well-known BCIZ nine-parameter triangular thin plate bending element is refined by the RDSM to yield a new nine-parameter thin plate bending element RT 9 . Numerical examples are presented to show that the present model passes the patch test and possesses high accuracy

M. A. M. Torkamani - One of the best experts on this subject based on the ideXlab platform.

  • Elasto-plastic analysis for cyclic loading and tresca yield condition
    Computational Mechanics, 1990
    Co-Authors: M. A. M. Torkamani
    Abstract:

    Incremental theory of plasticity along with the finite element Direct Stiffness Method is used for inelastic structural analysis. Tresca yield surface suitable for kinematic hardening formulation of the incremental theory of plasticity is presented. A uniaxial symmetric Tresca yield condition is used to formulate a small displacement theory of the incremental plasticity for material with both equal and unequal tension and compression yield strength.

  • Elasto-plastic analysis for cyclic loading and tresca yield condition
    Computational Mechanics, 1990
    Co-Authors: M. A. M. Torkamani
    Abstract:

    Incremental theory of plasticity along with the finite element Direct Stiffness Method is used for inelastic structural analysis. Tresca yield surface suitable for kinematic hardening formulation of the incremental theory of plasticity is presented. A uniaxial symmetric Tresca yield condition is used to formulate a small displacement theory of the incremental plasticity for material with both equal and unequal tension and compression yield strength. Constitutive laws for plane stress problem based on the linear kinematic hardening and associated flow rule are derived for sides and corners of the yield surface. In this formulation Ziegler's modification of Prager's rule has been used. Finite element formulation, numerical solution and applications are discussed.

Y K Cheung - One of the best experts on this subject based on the ideXlab platform.

  • refined nine parameter triangular thin plate bending element by using refined Direct Stiffness Method
    International Journal for Numerical Methods in Engineering, 1995
    Co-Authors: Y K Cheung, Chen Wanji
    Abstract:

    Based on a new generalized variational principle, a refined Direct Stiffness Method (RDSM) which can be Directly used to improve non-conforming elements is proposed. The formulation is similar to that of the Direct Stiffness Method (DSM), but the constraint condition of interelement continuity is satisfied in an average sense and as a result convergence and high accuracy are insured. The well-known BCIZ nine-parameter triangular thin plate bending element is refined by the RDSM to yield a new nine-parameter thin plate bending element RT 9 . Numerical examples are presented to show that the present model passes the patch test and possesses high accuracy

  • Refined nine‐parameter triangular thin plate bending element by using refined Direct Stiffness Method
    International Journal for Numerical Methods in Engineering, 1995
    Co-Authors: Y K Cheung, Chen Wanji
    Abstract:

    Based on a new generalized variational principle, a refined Direct Stiffness Method (RDSM) which can be Directly used to improve non-conforming elements is proposed. The formulation is similar to that of the Direct Stiffness Method (DSM), but the constraint condition of interelement continuity is satisfied in an average sense and as a result convergence and high accuracy are insured. The well-known BCIZ nine-parameter triangular thin plate bending element is refined by the RDSM to yield a new nine-parameter thin plate bending element RT 9 . Numerical examples are presented to show that the present model passes the patch test and possesses high accuracy

Lawrence C Bank - One of the best experts on this subject based on the ideXlab platform.

  • analysis of thin walled anisotropic frames by the Direct Stiffness Method
    International Journal of Solids and Structures, 1995
    Co-Authors: Emmanuel Cofie, Lawrence C Bank
    Abstract:

    The Stiffness matrix for a one-dimensional beam element for use in a Direct Stiffness matrix Method for analysing thin-walled anisotropic frames is presented in this paper. Thin-walled beams are widely used as structural components and stiffeners in aerospace and civil engineering applications. The Stiffness matrices for two 2-noded 12 degrees of freedom beam elements, one of which accounts for warping and anisotropic coupling only and called a "warping superelement", and the other a "non-warping element", are developed numerically. The warping superelement is used in the region of the beam where warping is considered critical. The length of this region, which is dependent on the geometric and mechanical properties of the beam cross-section, is determined using a technique that utilizes equivalent one-dimensional mechanical properties of the composite material panels in the cross-section. The non-warping element is used outside of this critical region. Numerical examples of a thin-walled space frame structure are presented to demonstrate the use of the beam model. Results obtained using the proposed model are compared with numerical results obtained from 2-D finite element analysis.

Emmanuel Cofie - One of the best experts on this subject based on the ideXlab platform.

  • analysis of thin walled anisotropic frames by the Direct Stiffness Method
    International Journal of Solids and Structures, 1995
    Co-Authors: Emmanuel Cofie, Lawrence C Bank
    Abstract:

    The Stiffness matrix for a one-dimensional beam element for use in a Direct Stiffness matrix Method for analysing thin-walled anisotropic frames is presented in this paper. Thin-walled beams are widely used as structural components and stiffeners in aerospace and civil engineering applications. The Stiffness matrices for two 2-noded 12 degrees of freedom beam elements, one of which accounts for warping and anisotropic coupling only and called a "warping superelement", and the other a "non-warping element", are developed numerically. The warping superelement is used in the region of the beam where warping is considered critical. The length of this region, which is dependent on the geometric and mechanical properties of the beam cross-section, is determined using a technique that utilizes equivalent one-dimensional mechanical properties of the composite material panels in the cross-section. The non-warping element is used outside of this critical region. Numerical examples of a thin-walled space frame structure are presented to demonstrate the use of the beam model. Results obtained using the proposed model are compared with numerical results obtained from 2-D finite element analysis.