Open Access
ARTICLE
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
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
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
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
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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