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  • Open Access

    ARTICLE

    Study on Reaction Diffusion Behavior in NG-Al/CG-Cu Diffusion Couple

    B. Xu1, W.P. Tong1, H. Zhang1, L. Zuo1, J. C. He1
    Structural Longevity, Vol.8, No.3, pp. 139-148, 2012, DOI:10.3970/sl.2012.008.139
    Abstract A novel technique has been developed to produce nanostructuregrained (NG) Al coatings on Cu plate by means of surface mechanical attrition treatment (SMAT). The reaction diffusion behavior in nanostructure-grained (NG) Al/course-grained (CG) Cu diffusion couple was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The experimental results showed that the aluminizing kinetics of NG coating on Cu plate was obviously enhanced, and the temperature to form compound layer was also greatly reduced with respect to the coarse-grained (CG) Al/coarse-grained (CG) Cu diffusion couple. The activation energy for compound layer growth in the NG-Al/CG-Cu diffusion couple was calculated… More >

  • Open Access

    ARTICLE

    Multi-Phase Modeling of Concrete Subject to Alkali Silica Reaction

    C. Comi1, R. Pignatelli1
    Structural Longevity, Vol.8, No.3, pp. 149-157, 2012, DOI:10.3970/sl.2012.008.149
    Abstract This work focuses on a multi-phase chemo-elastic damage model for the description of the mechanical degradation of concrete induced by the Alkali Silica Reaction (ASR). A threephase and a two-phase simplified versions are considered. The model accounts for ASR kinetics, depending on temperature and humidity conditions, and the swelling pressure exerted by the ASR reaction products on the skeleton. Damage and viscous phenomena are taken into account. The model is used to simulate the experimental tests on concrete reactive beams performed at varying environmental humidity conditions. More >

  • Open Access

    ARTICLE

    A Study of the Cutting Temperature in Milling Stainless Steels with Chamfered Main Cutting Edge Sharp Worn Tools

    Chung-Shin Chang1
    Structural Longevity, Vol.8, No.3, pp. 159-171, 2012, DOI:10.3970/sl.2012.008.159
    Abstract The main purpose of this paper is to study the carbide tip’s surface temperature and the cutting forces of milling stainless steel with chamfered main cutting sharp worn tools. The carbide tip’s mounting in the tool holder are ground to a wear depth that is measured by a toolmaker microscope and a new cutting temperature model incorporating tool wear factor and using the variations of shear and friction plane areas occurring in tool worn situations are presented in this paper. The tool tip and cutting edges are treated as a series of elementary cutting tips. The forces and frictional heat… More >

  • Open Access

    ARTICLE

    Hydraulic Fracture Propagation in Unconventional Reservoirs: The Role of Bedding Plane

    Suling Wang1, Yang Li1, He Liu2, Minzheng Jiang1
    Structural Longevity, Vol.8, No.3, pp. 173-191, 2012, DOI:10.3970/sl.2012.008.173
    Abstract Hydraulic fracturing is a widely used technology in stimulation of unconventional reservoirs to obtain commercial production. Meanwhile, the bedding plane between sandstone and mudstone is a key challenge in unconventional reservoirs especially. During hydraulic fracture propagation, any diversion or abrupt change in hydraulic fracture path caused by bedding plane, leads to job failure.
    In this paper, presents a numerical simulation method for a growth of hydraulic fracture interacting with a geological discontinuity in bedding plane. A 3-D hydraulic fracture model has been developed that can consider the elastic-plastic rock deformation coupled to fluid flow. The fracture growth is modeled by… More >

  • Open Access

    ARTICLE

    A New Method to Achieve Equivalent Plastic Strain Explicit Form of J2 Plastic Isotropic Kinematic Hardening Model and Numerical Verification

    Peng Cao1, Decheng Feng2, Changjun Zhou3
    Structural Longevity, Vol.8, No.3, pp. 193-206, 2012, DOI:10.3970/sl.2012.008.193
    Abstract Based on the classic J2 Plastic Flow Theory, the explicit equation of the equivalent plastic strain was derived elaborately utilizing the tensor analysis method. And a modified method commenced with the plastic flow rule was employed to obtain the same explicit equation. Finally, a subroutine written with FORTRAN was imported into the ABAQUS-version6.11 to validate the robustness of the numerical integrated scheme above The derivation procedure for the explicit equation of the equivalent plastic strain based on J2 Plastic Flow Theory can be utilized as an alternate method to solve complicated constitute integrated problems. And the developed algorithm can save… More >

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