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  • Open Access

    ARTICLE

    Large Strain Consolidation Stochastic Finite Element Method for Soft-clay Road Embankment Analysis

    Li Tao1,2, Gao Jian2, Zhang Yi-ping3
    Structural Longevity, Vol.5, No.3, pp. 117-128, 2011, DOI:10.3970/sl.2011.005.117
    Abstract This paper presents a method for the large strain consolidation analysis of soft-clay road embankment with stochastic parameters to random excitation. Based on the large strain theory of continuum material, Biot consolidation theory and Neumann stochastic finite element method (NSFEM), the large strain consolidation NSFEM (LSC-NSFEM) has been established. A program of LSC-NSFEM is designed to analyze soft-clay road embankment. The residue iteration method is used to deal with the nonlinear fluctuating part of stiffness matrix, and the approximate algorithm of the fluctuating part of stiffness matrix is designed to improve LSC-NSFEM program efficiency. More >

  • Open Access

    ARTICLE

    Study of Stiffness of a Linear Guideway by FEA and Experiment

    D. Shaw1, W.L. Su
    Structural Longevity, Vol.5, No.3, pp. 129-138, 2011, DOI:10.3970/sl.2011.005.129
    Abstract Linear rolling ball guideway is a key component of many machines. However, due to the point contact between the ball and the groove, stiffness of linear guideway is the major factor which affects the rigidity and precision of machines. Preload in the guideway can increase the stiffness of linear guideway and thus reduces the position deviation under an external load. The purpose of this study is to develop FEA and compare the results with experimental results to prove the correctness of the FEA model. This model can be used to predict the stiffness of linear guideway with 4 rows of… More >

  • Open Access

    ARTICLE

    Theoretical Study of Contact Angles of a Linear Guideway

    D. Shaw1
    Structural Longevity, Vol.5, No.3, pp. 139-145, 2011, DOI:10.3970/sl.2011.005.139
    Abstract The contact angle affects the life and accuracy of a linear gudieway. In this study, the factors which effect the angle of contact angle of linear guideway includes contact deformation of balls and grooves, downward load, ball diameter, number of load-carrying balls, number of load-carrying rows and conformity. A theoretical approach for finding the contact angle changed of linear gudieway is proposed by using Hertzian theory and Lundeberg/Palmgren approach. The results are useful for modification of loading capability of linear gudieway under load and different preload setting. More >

  • Open Access

    ARTICLE

    A Spatial FEM Model of Thermal and Mechanical Action in RCC dam

    M. S. Jaafar1, J. Noorzaei1,2, A. A. Abdulrazeg1, T. A. Mohammed1, P. Khanehzaei1
    Structural Longevity, Vol.5, No.3, pp. 147-155, 2011, DOI:10.3970/sl.2011.005.147
    Abstract Specific features of the thermal stress fields in roller compacted concrete (RCC) dam are always their spatial character and completely dependent on the maturity functions such as deformations properties (elastic, creep). The thermal changes in the material affect the elastic, creep properties of the material, and in turn, the stress fields within the structure. Therefore, the effects of temperature on the properties of RCC materials( elastic, creep) has to be taken into account in order to determine the risk of the thermally induced cracking in these dams. In this study, a viscoelastic model, including ageing effects and thermal dependent properties… More >

  • Open Access

    ARTICLE

    Optimization of the Multiple-Relaxation-Time Micro-Flow Lattice Boltzmann Method

    Kazuhiko Suga1, Takahiko Ito1
    Structural Longevity, Vol.5, No.3, pp. 157-160, 2011, DOI:10.3970/sl.2011.005.157
    Abstract Evaluation and optimization of the multiple-relaxation-time (MRT) lattice Boltzmann method for micro-flows (µ-flow LBM) are performed with the two-dimensional nine discrete velocity (D2Q9) model. The MRT µ-flow LBM consisting of the combination of bounce-back and full diffusive (CBBFD) wall boundary condition is considered. Based on the discussion of Chai et al. (2010), the presently applied CBBFD model and relaxation time for heat flux τq satisfy the second-order slip boundary condition. However, modification to the MRT model of Chai et al. (MRT-C) is made to the relaxation time for the moments related to the stress τs by introducing the psi function… More >

  • Open Access

    ARTICLE

    Design of Processing System of Vibration Signals

    Zeng Fan1, Zhu shijian1, Lou jingjun1
    Structural Longevity, Vol.5, No.3, pp. 161-169, 2011, DOI:10.3970/sl.2011.005.161
    Abstract A signal processing electric circuit used in vibration signals processing system has been designed, which contains the pre-amplifier, the single chip ATMEGA16 and the microprocessor programmable MAX262 and so on. Its feasibility test is carried out. The center frequency and other parameters are input into the computer by VC software programmed, and the computer sends these instructions to the single chip. The single chip controls MAX262 filter to work regularly and the noise signals are well filtered. The signals output from the data sampler are analyzed and processed, and the vibration signals can be clearly recognized. The experimental results show… More >

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