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  • Open Access

    ARTICLE

    Determination of Interior Point Solutions for 3D Generally Anisotropic Elastic Solids by the Boundary Element Method

    C. L. Tan1, Y.C. Shiah2
    Structural Longevity, Vol.4, No.1, pp. 1-10, 2010, DOI:10.3970/sl.2010.004.001
    Abstract Using newly derived explicit algebraic forms of the first- and secondorder derivatives of the Green’s function, interior point solutions for the displacements and stresses in 3D generally anisotropic elastic bodies are obtained using the boundary element method (BEM). The approach, which follows the same vein as in BEM for isotropic elasticity via Somigliana’s identities, has not been successfully achieved previously in the literature due to the analytical difficulties involved with using the non-explicit forms of the Green’s function. The veracity of the formulation and implementation is demonstrated by some examples. More >

  • Open Access

    ARTICLE

    A Novel Constitutive Equation for Inverse Analysis Method and its Application in Sheet Metal Forming

    Xiaoyang Lu1, Bingtao Tang1, Xiaoli Lu2
    Structural Longevity, Vol.4, No.1, pp. 11-20, 2010, DOI:10.3970/sl.2010.004.011
    Abstract The Traditional Inverse Analysis Method (TIAM) of sheet metal stamping has the shortcomings of neglecting the effects of deformation history on stress prediction. An Updated Inverse Analysis Method (UIAM) is proposed based on the final workpiece in Euler coordinate system. The UIAM uses the constitutive equation based on flow theory of plasticity to consider the loading history. In order to avoid numerous iterations to ensure the numerical stability in Newton-Raphson scheme to obtain plastic multiplier ∆λ, the equation in unknown stress vectors is transformed into a scalar equation using the notion of the equivalent stress. Thus a scalar equation of… More >

  • Open Access

    ARTICLE

    Study on Regularities of the Dimensionless Pressure in Bending Pipes

    Lu Xiaoyang1, Zhang Hao2, Lu Xiaoli3
    Structural Longevity, Vol.4, No.1, pp. 21-29, 2010, DOI:10.3970/sl.2010.004.021
    Abstract This paper studies the distribution of dimensionless pressure in elbow pipes by dimensional analysis methods. The qualitative description method of fluid flow such as 90˚ elbow pipe is obtained. With Computational Fluid Dynamics (CFD), the effect of a number of dimensionless parameters such as the non-dimensional curvature, Reynolds number, dimensionless axial angle α and annular angle β and other factors on the spatial distribution of pressure inside the elbow is analyzed and discussed in detail. This paper not only provides theoretical and numerical methods for understanding the dynamic behavior of the fluid in the elbow pipes, but also provides the… More >

  • Open Access

    ARTICLE

    Simulation of C-Start and S-Start of Fishes by an ALE-GFD Method and a Curvature-Wave Backbone Model

    Y. Zhao1, K.S. Yeo1, P. Yu1, S.J. Ang1
    Structural Longevity, Vol.4, No.1, pp. 31-38, 2010, DOI:10.3970/sl.2010.004.031
    Abstract This paper presents the application of an Arbitrary Lagrangian Eulerian (ALE) and Singular Value Decomposition (SVD) based Generalized Finite Difference (GFD) method to simulate the C- and S-starts of a carangiform-type fish. The numerical model incorporate fluid-structure interaction (FSI) and computation is carried out on a hybrid grid comprising meshfree nodes around the undulating/deforming swimming fish and Cartesian nodes in the background. The meshfree nodes convect with the deformation and motion of the swimmer. A curvaturewave model of the backbone is used to generate the C- and S-start actions of the fish from the experimental data of Spierts and Leeuwen… More >

  • Open Access

    ARTICLE

    Simulation of Newtonian-Fluid Flows with C2 -Continuous Two-Node Integrated-RBF Elements

    D.-A. An-Vo1, N. Mai-Duy1, T. Tran-Cong1
    Structural Longevity, Vol.4, No.1, pp. 39-45, 2010, DOI:10.3970/sl.2010.004.039
    Abstract In this paper, the C2 -continuous control-volume method based on 2-node integrated radial basis function elements (IRBFEs) [CMES, vol.72, no.4, pp.299-334, 2011] are further developed for the simulation of incompressible viscous flows in two dimensions. Emphasis is placed on (i) the 2-node IRBFE discretisation of the stream function-vorticity formulation on Cartesian grids; and (ii) the development of a high order upwind scheme based on 2-node IRBFEs for the case of simulating convection-dominant flows. High levels of accuracy and efficiency of the present method are demonstrated by solving the lid-driven cavity problem. More >

  • Open Access

    ARTICLE

    Calculation on the Ultimate Vertical Strength of Steel Tube in CFST Stub Column

    Zhi-quan Zhang1, Jia-xiang Chi2, Yu-fen Zhang3
    Structural Longevity, Vol.4, No.1, pp. 47-55, 2010, DOI:10.3970/sl.2010.004.047
    Abstract This paper concentrates on the compressive strength of steel tube in Concrete-filled steel tube (CFST) column. Through an elasto-plastic limit analysis based on Twin Shear Unified Strength Theory (TSUST), the vertical load capacity of the steel tube alone was analyzed by adopting a parameter b, which varies from 0 to 1. And the strength reduction factor has been derived by total theory of plasticity. A new analytical formula, capable of predicting the axial bearing capacity of the CFST stub columns subjected to axial compression, has been developed based on the linear approximation of Mises yield criterion among TSUST. And There… More >

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