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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Mechanical Engineers A
Journal Basic Information
Journal DOI :
The Korean Society of Mechanical Engineers
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Volume & Issues
Volume 31, Issue 12 - Dec 2007
Volume 31, Issue 11 - Nov 2007
Volume 31, Issue 10 - Oct 2007
Volume 31, Issue 9 - Sep 2007
Volume 31, Issue 8 - Aug 2007
Volume 31, Issue 7 - Jul 2007
Volume 31, Issue 6 - Jun 2007
Volume 31, Issue 5 - May 2007
Volume 31, Issue 4 - Apr 2007
Volume 31, Issue 3 - Mar 2007
Volume 31, Issue 2 - Feb 2007
Volume 31, Issue 1 - Jan 2007
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Performance Tests and Development of the Cyclic Load Device Using a Bellows
Choi, Myoung-Hwan ; Cho, Man-Soon ; Park, Sung-Jae ; Kim, Bong-Goo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 31, issue 9, 2007, Pages 903~909
DOI : 10.3795/KSME-A.2007.31.9.903
A fatigue capsule is one of the special capsules to investigate the fatigue characteristics of the nuclear materials during an irradiation test in a research reactor, HANARO. In this study, the performance test and the preliminary fatigue test results by using a cyclic load device newly developed for a fatigue capsule are described. In order to obtain the characteristics such as a realization and a controllability of the periodic wave shape and the relationship between the pressure and the load, a spring and rigid bar specimens are used. The fatigue test for the 316L stainless steel specimen with 1.8mm in diameter and 12.5mm in gage length is also performed under the same conditions as the temperature(
) of the specimen during irradiation tests. As a result of the test, the fracture of the specimen occurs at a total of 70,120 cycles(about 12 days), and the displacement in this case is 2.02 mm. It is expected that these results will be used for determining test conditions and a comparison of the in-pile fatigue test results.
Development of the Nanofluidic Filter and Nanopore Micromixer Using Self-Assembly of Nano-Spheres and Surface Tension
Seo, Young-Ho ; Choi, Doo-Sun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 31, issue 9, 2007, Pages 910~914
DOI : 10.3795/KSME-A.2007.31.9.910
We present a simple and an inexpensive method for the fabrication of a nano-fluidic filter and a nano-pore micromixer using self-assembly of nano-spheres and surface tension. Colloid-plug was formed by surface tension of liquid in a microchannel to fabricate nanofluidic filter. When colloid is evaporated, nano-spheres in a colloid are orderly stacked by a capillary force. Orderly stacked nano-spheres form 3-D nano-mesh which can be used as a mesh structure of a fluidic filter. We used silica nano-sphere whose diameter is
, and silicon micro-channel of
-diameter. Fabricated nano-fluidic filter in a micro-channel has median pore diameter of 158nm which was in agreement with expected diameter of the nano-pore of
. A nano-pore micromixer consists of
micro-channel and self-assembled nano-spheres. In the nano-pore micromixer, two different fluids had no sooner met together than two fluids begin to mix at wide region. From the experimental study, we completely apply self-assembly of nano-spheres to nano-fluidic devices.
Degradation Behavior and Micro-Hardness Analysis of a Coolant Rubber Hose for Automotive Radiator
Kwak, Seung-Bum ; Shin, Sei-Moon ; Shin, Wae-Gi ; Choi, Nak-Sam ;
Transactions of the Korean Society of Mechanical Engineers A, volume 31, issue 9, 2007, Pages 915~923
DOI : 10.3795/KSME-A.2007.31.9.915
Rubber hoses for automobile radiators are apt to be degraded and thus failed due to the influence of contacting stresses of air and coolant liquid under thermal and mechanical loadings. The aging behaviors of the skin part of the hoses due to thermo-oxidative and electro-chemical stresses were experimentally analyzed. Through the thermo-oxidative aging test, it was shown that the surface hardness IRHD(International Rubber Hardness Degrees) of the rubber increased with a considerable reduction of failure strain as the aging time and temperature increased. On account of the penetration of coolant liquid into the skin part influenced by the electro-chemical degradation(ECD) test the weight of the rubber hose increased, whereas their failure strain and IRHD hardness decreased. The hardness of the hose in the side of the negative pole was the most deteriorated at the test site of the hose skin just below the coolant surface.
Optimization of Finish Cutting Condition of Impeller with Five-Axis Machine by Response Surface Method
Lim, Pyo ; Yang, Gyun-Eui ;
Transactions of the Korean Society of Mechanical Engineers A, volume 31, issue 9, 2007, Pages 924~933
DOI : 10.3795/KSME-A.2007.31.9.924
An impeller is a important part of turbo-machinery. It has a set of twisted surfaces because it consists of many blades. Five-axis machining is required to produce a impeller because of interference between tool and workpiece. It can obtain good surface integrity and high productivity. This paper proposes finish cutting method for machining impeller with 5-axis machining center and optimization of cutting condition by response surface method. Firstly, cutting methods are selected by consideration of operation characteristics. Secondly, response factors are determined as cutting time and cutting error for prediction of productivity. Experiments are projected by central composite design with axis point. Thirdly, regression linear models are estimated as single surface in the leading edge and as dual surface in the hub surface cutting. Finally, cutting conditions are optimized.
The Characteristic Analysis of the Load-sensitive Hydraulic Control System for Closed Center Type of a Wheel Loader
Lee, Seung-Hyun ; Song, Chang-Seop ; Chung, Chun-Kuk ;
Transactions of the Korean Society of Mechanical Engineers A, volume 31, issue 9, 2007, Pages 934~942
DOI : 10.3795/KSME-A.2007.31.9.934
In this study, the characteristics of the load-sensitive hydraulic control system for closed center type of a wheel loader were analyzed using developed analysis program based on Amesim tool. From the parametric analysis, the effects of each factor were revealed. Through the simulation with varying parameters, the system parameter effects on the controllable region and the pump pressure and load pressure variations were studied. The results were compared with the experimental ones. The results and discussions of the present paper could aid in the design of a load-sensitive hydraulic control system for closed center type.
Failure Maps and Derivation of Optimal Design Parameters for a Quasi-Kagome Truss Sandwich Panel Subjected to Bending Load
Lim, Chai-Hong ; Jeon, In-Su ; Kang, Ki-Ju ;
Transactions of the Korean Society of Mechanical Engineers A, volume 31, issue 9, 2007, Pages 943~950
DOI : 10.3795/KSME-A.2007.31.9.943
A new metallic sandwich panel with a quasi-Kagome truss core subjected to bending load has been analyzed. First, equations of the failure loads corresponding to the eight failure modes are presented. Then, non-dimensional forms of the equations are derived as functions of three geometric variables, one material parameter (yield strain), one load index and one weight index. Failure maps are presented for a given weight index. By using the dimensionless forms of equations as the design constraints, two kinds of optimization are performed. One is based on the weight, that is, the objective function, namely, the dimensionless load is to be maximized for a given weight. Another is based on the load, that is, the dimensionless weight is to be minimized for a given load. The results of the two optimization processes are found to agree each other. The optimized geometric variables are derived as a function of given weights or failure loads. The performance of the quasi-Kagome truss as the core of a sandwich panel is evaluated by comparison with those of honeycomb cored and octet truss cored panels.
Mechanical Characterization of Elastomeric Polymer Through Micro Instrumented Indentation Technique
Lee, Gyu-Jei ; Kang, Seung-Kyun ; Kang, In-Geun ; Kwon, Dong-Il ;
Transactions of the Korean Society of Mechanical Engineers A, volume 31, issue 9, 2007, Pages 951~959
DOI : 10.3795/KSME-A.2007.31.9.951
In this study, the Johnson-Kendall-Roberts(JKR) theory was combined with the instrumented indentation technique (IIT) to evaluate work of adhesion and modulus of elastomeric polymer. Indentation test was used to obtain the load-displacement data for contacts between Tungsten Carbide indenter and elastomeric polymer. And the JKR contact model, contrived to take viscoelastic effects of polymer into account, was applied to compensate the contact area and the elastic modulus which Hertzian contact model would underestimate and overestimate, respectively. Besides, we could obtain the thermodynamic work of adhesion by considering the surface energy in this contact model. In order to define the relation between JKR contact area and applied load without optical measuring of contact area, we used the relation between applied load and contact stiffness by examining the correlation between JKR contact area and stiffness through dimensional analysis with 14 kinds of elastomeric polymer. From this work, it could be demonstrated that the interfacial work of adhesion and elastic modulus of compliant polymer can be obtained from a simple instrumented indentation testing without area measurement, and provided as the main algorithm of compliant polymer characterization.
Feed Optimization Based on Virtual Manufacturing for High-Efficiency Turning
Kang, You-Gu ; Cho, Jae-Wan ; Kim, Seok-Il ;
Transactions of the Korean Society of Mechanical Engineers A, volume 31, issue 9, 2007, Pages 960~966
DOI : 10.3795/KSME-A.2007.31.9.960
High-efficient machining, which means to machine a part in the least amount of time, is the most effective tool to improve productivity. In this study, a new feed optimization method based on virtual manufacturing was proposed to realize the high-efficient machining in turning process through the cutting power regulation. The cutting area was evaluated by using the Boolean intersection operation between the cutting tool and workpiece. And the cutting force and power were predicted from the cutting parameters such as feed, depth of cut, spindle speed, specific cutting force, and so on. Especially, the reliability of the proposed optimization method was validated by comparing the predicted and measured cutting forces. The simulation results showed that the proposed optimization method could effectively enhance the productivity in turning process.
Green's Function of Cracks in Piezoelectric Material
Choi, Sung-Ryul ;
Transactions of the Korean Society of Mechanical Engineers A, volume 31, issue 9, 2007, Pages 967~974
DOI : 10.3795/KSME-A.2007.31.9.967
A general form solution is considered for a piezoelectric material containing impermeable cracks subjected to a combined mechanical and in-plane electrical loading. The analysis is based upon the Hilbert problem formulation. Using this solution, typically for a central crack in transverse isotropic piezoelectric material, a closed form solution is obtained, where one concentrated mechanical and electrical load is subjected to the crack surface. This problem could be used as a Green's function to generate the solutions of other problems with the same geometry but of different loading conditions.
Development of Diagnosis System for Diaphragm Operated Globe Valve
Yang, Sang-Min ; Shin, Sung-Ky ;
Transactions of the Korean Society of Mechanical Engineers A, volume 31, issue 9, 2007, Pages 975~980
DOI : 10.3795/KSME-A.2007.31.9.975
Air-operated valve is one of principal valves that are used to control fluid flow in nuclear power plants. A periodic diagnosis for the safety of power plants is necessary. But there are many difficulties such as economic loss caused by income of high cost devices and a matter hard to deal with users. In this study, we developed the diagnostic system that users of power plants are easy to handle. The diagnostic system is composed of database module, diagnosis test module and analysis module.