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  • Open Access

    ARTICLE

    Comparison of Constitutive Models Using Different Yield Functions for Porous Shape Memory Alloy with Experimental Date

    Bingfei Liu, Guansuo Dui1, Yuping Zhu
    Structural Longevity, Vol.4, No.3, pp. 113-120, 2010, DOI:10.3970/sl.2010.004.113
    Abstract Several constitutive models with different yield functions for porous shape memory alloy (SMA) are compared with the experimental date. Different approaches such as upper bound theory and lower bound theory have been adopted and a new correction formula of the yield function is proposed in this work to study the behavior of porous SMAs. Numerical results are compared with the experimental date by Zhao et al (2005). It shows that the researches using upper bound and lower bound are nearly the same and the new correction formula is much closer to the experimental data than others. More >

  • Open Access

    ARTICLE

    Comparison of Constitutive Models Using Different Yield Functions for Porous Shape Memory Alloy with Experimental Date

    Bingfei Liu, Guansuo Dui1, Yuping Zhu
    Structural Longevity, Vol.4, No.3, pp. 113-120, 2010, DOI:10.3970/sl.2010.004.113
    Abstract Several constitutive models with different yield functions for porous shape memory alloy (SMA) are compared with the experimental date. Different approaches such as upper bound theory and lower bound theory have been adopted and a new correction formula of the yield function is proposed in this work to study the behavior of porous SMAs. Numerical results are compared with the experimental date by Zhao et al (2005). It shows that the researches using upper bound and lower bound are nearly the same and the new correction formula is much closer to the experimental data than others. More >

  • Open Access

    ARTICLE

    On Effective Permeability of Heterogeneous Porous Media

    A.P.S. Selvadurai1, P.A. Selvadurai2
    Structural Longevity, Vol.4, No.3, pp. 121-128, 2010, DOI:10.3970/sl.2010.004.121
    Abstract The conventional procedures for describing fluid flow in porous media largely rely on assumptions of spatial homogeneity and isotropy. In contrast, naturally occurring porous geologic media display heterogeneity and anisotropy that is scale-dependent. This paper summarizes results of recent research that uses experimental techniques, mathematical analyses of the experimental configurations and computational procedures for developing estimates for the effective permeability of a heterogeneous porous geomaterial. More >

  • Open Access

    ARTICLE

    On Effective Permeability of Heterogeneous Porous Media

    A.P.S. Selvadurai1, P.A. Selvadurai2
    Structural Longevity, Vol.4, No.3, pp. 121-128, 2010, DOI:10.3970/sl.2010.004.121
    Abstract The conventional procedures for describing fluid flow in porous media largely rely on assumptions of spatial homogeneity and isotropy. In contrast, naturally occurring porous geologic media display heterogeneity and anisotropy that is scale-dependent. This paper summarizes results of recent research that uses experimental techniques, mathematical analyses of the experimental configurations and computational procedures for developing estimates for the effective permeability of a heterogeneous porous geomaterial. More >

  • Open Access

    ARTICLE

    From Research to System Application – Overview of the Current Fuel Cell Demonstration and Promotion Program in Taiwan

    Alice Chia-Mei Liu1, Chang-Chung Yang1, Sheng-Yuan Huang2
    Structural Longevity, Vol.4, No.3, pp. 129-135, 2010, DOI:10.3970/sl.2010.004.129
    Abstract Fuel cell technology is considered one of the hottest topics in green energy and has become an emerging green energy industry internationally. In the meantime, the development of the fuel cell industry has been recognized as one of the key rising industries in Taiwan. Since 2009, the Industrial Technology Research Institute (ITRI) has collaborated with Chung-Hua Institute for Economic Research (CIER) in implementing the fuel cell demonstration and promotion program supported by the Bureau of Energy, Ministry of Economic Affairs. This program focuses on three major areas for application of fuel cells: backup power supply, normal power & combined heat… More >

  • Open Access

    ARTICLE

    Phase Transformation Behavior of C60 Fullerene under Atmospheric Pressure

    Wen-Hwa Chen1,2, Chun-Hung Wu1, Hsien-Chie Cheng3,4
    Structural Longevity, Vol.4, No.3, pp. 137-144, 2010, DOI:10.3970/sl.2010.004.137
    Abstract The phase transformation behaviors of C60 fullerene under atmospheric pressure are reported using a proposed thermostat molecular dynamics method designed for a solid system. We find that C60 fullerene directly undergoes a solidvapor phase transformation, instead of a solid-liquid phase transition, at a specific threshold temperature. It reveals that C60 fullerene will sublimate when heated rather than melt under atmospheric pressure. This phenomenon is coincident with that of graphite at pressures below 10MPa. The sublimation point of C60 fullerene, rather than the melting, is about 4350±20K, locating in the published range of about 4000-4500K for graphite at pressures below 10… More >

  • Open Access

    ARTICLE

    Effect of Loading Frequency on Fatigue Properties of Ni-base Super Alloy Inconel 718

    N. Yan1, N. Kawagoishi2, Y. Maeda3, Q. Chen4
    Structural Longevity, Vol.4, No.3, pp. 145-152, 2010, DOI:10.3970/sl.2010.004.145
    Abstract Fatigue tests under rotating bending and ultrasonic loading were carried out using plain specimens with different grain sizes of Ni-base super alloy, Inconel 718, in order to investigate the effects of grain size and loading frequency on fatigue properties. Fatigue strength was increased with decreasing in grain size under both tests. Moreover, the fatigue strength under ultrasonic loading was higher than that under rotating bending. The resistance to crack initiation was larger in smaller grain sized alloy under both tests, and larger under ultrasonic loading than under rotating bending. Effects of loading frequency and grain size on crack initiation were… More >

  • Open Access

    ARTICLE

    Flow Simulations by a Particle Method Using Logarithmic Weighting Function

    K. Kakuda1, J. Toyotani1, S. Matsuda2, H. Tanaka2, K. Katagiri2
    Structural Longevity, Vol.4, No.3, pp. 154-161, 2010, DOI:10.3970/sl.2010.004.154
    Abstract The application of a particle method to incompressible viscous fluid flow problems is presented. The method is based on the MPS (Moving Particle Semi-implicit) scheme using logarithmic weighting function. Numerical results demonstrate the workability and the validity of the present approach through incompressible viscous fluid flow in a driven cavity and flow behavior in a liquid ring pump with rotating impeller blades. More >

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