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  • 1
    Electronic Resource
    Electronic Resource
    Identification of Precipitates Appearing in Al-Li-Cu-Zr Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1457-1460 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Identification of precipitates appearing during DSC scan of Al-2.1Li-2.9Cu-0.12Zr(wt. pct) alloyhas been conducted as a function of temperature by using a differential scanning calorimetry (DSC)and transmission electron microscopy(TEM). In the as-quenched specimen from 540℃, threecouples of heat evolution and absorption peaks are observed during the heating period of DSCexperiments. It is found from TEM works that these peaks are associated with the formation anddissolution of GP zone, δ‘, and T1(+θ') phases. The heat evolution peak appearing in the temperaturerange over 36~78℃ is due to the formation of GP zone. Heat absorption peak appearing in 78~140℃is associated with the dissolution of GP zone. Heat evolution peaking at 166℃ in the temperaturerange over 140~190℃ and next heat absorption peak are attributed to the formation and dissolutionof δ‘ phase. Heat evolution peaking at 288℃ in the temperature range of 254~332℃ and heatabsorption at high temperature are attributed to the formation and dissolution of T1(+θ'). The hump inDSC curve at the temperature of 425℃ is considered as the formation of hexagonal structure T2phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1457.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    A Study on Fatigue Properties of Sc and Zr Added Al Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 657-660 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Al alloy is used extensively in several fields because specific strength is good andworkability is superior. It is known that If Sc is added to Al alloy, strength is increased andre-crystallization temperature rises because microstructure becomes fine. The high cycle fatigueproperties of four kinds of Al-Mg-Si alloys without and with only scandium of 0.20 % or with bothscandium(Sc) of 0.20 % and zirconium(Zr) of 0.12% were investigated. The fatigue strength wasdetermined at R = -1.0 under constant amplitude loading conditions in air. The alloy with scandium of0.20 % showed a little higher fatigue strength values. The alloy with 0.20 % Sc and 0.12 % Zr showedhighest tensile yield strength and highest fatigue strength. The fine grained Al 6061+0.20Sc+0.12Zralloy exhibited a higher resistance against fatigue crack nucleation in comparison to the coarsegrained Al 6061 alloy. The results can be explained mainly with the micro-structural differencesamong four alloys. This results are due to the presence of coherent Al3 (Sc, Zr) precipitates and a veryfine sub-grain structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.657.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    A Study on the Aging Behavior of Al-Li-Cu-Zr Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 1525-1528 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Aging behavior of Al-2.1Li-2.9Cu-0.12Zr(wt%) alloy has been studied as functions ofaging time and temperature by using a differential scanning calorimetry(DSC) and transmissionelectron microscopy(TEM). The aged specimens at 130, 160, 190℃were compared with theas-quenched specimen in view of the aging behavior by observing the reaction enthalpy during theheating period of DSC experiments. DSC peak associated with the formation of GP zone is notobserved at 130 and 160℃, but it does at 190℃, so it is found that the thermal stability of GP zone ischanged at between 160 and 190℃. At the aging temperature of 130℃, the heat absorptioncorresponds to the formation of δ´ increases, while the heat evolution related with the formation of T1reveals an opposite trend. In aging temperature of 160 and 190℃, aging time representing the drasticdecrease of heat absorption of δ´ is coincident with the transition time showing the decreasing of heatevolution of T1. The micro-Vickers hardness of the specimens aged at 160℃ and 190℃ showsmaximum values about 182 and 165 at aging times of about 72 hr and 25hr, respectively. Fromcomparing reaction enthalpies for the dissolution of δ´ and the formation of T1 phases with the agingtime showing the maximum hardness, it is found that δ´ phase rather than T1 phase markedlycontributes to the hardening at an aging temperature of 160℃. In contrast, T1 phase plays an importantrole in hardening at an aging temperature of 190℃
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1525.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Explosion Bulge Test of High Srength Low Alloy Steel PFS-700 in Air and Underwater (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 1101-1104 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Explosion Bulge Test in air has been carried out in order to evaluate base metal andweldment of pre-heating free steel, PFS-700 which was developed for using in submarine, destroyerand aircraft carrier and specified as Korean military specification, KDS-9515-3001. PFS-700 steel hasgood weldability so that it can be welded without pre-heating before welding. 1.4wt.% of Copper isadded to compensate for the decrease of strength due to the decrease of Carbon in PFS-700. Usually,PFS-700 is aged at the temperature of about 650°C for the combination of strength and toughness.PFS-700 of the thickness of 25mm aged at 650°C was used for explosion bulge test. Underwaterweapon system demands to conduct this test for the security of weld structures, and test method andprocedure are specified in the military specification, MIL-STD-4139(SH). PFS-700 was explosionbulge tested as specified in this spec. Mechanical tests such as tensile test, CVN impact test, dynamictear test and bend test are conducted from the specimens taken from prolonged EBT specimen andcompared with the properties specified in KDS-9515-3001. EBT results show that PFS-700 weldedwith the welding material of spoorlarc-120 has over the thickness reduction of 14% withoutpropagation of crack to the hole-down area
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.1101.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    A Study on DC Motor Noise Reduction (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 270-273 (Aug. 2004), p. 1434-1439 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.270-273.1434.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Computation of Dynamic Stress in Flexible Multi-Body Dynamics Using Absolute Nodal Coordinate Formulation (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 270-273 (Aug. 2004), p. 1427-1433 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.270-273.1427.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Structural Vibration Analysis of Electronic Equipment for Satellite under Launch Environment (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 270-273 (Aug. 2004), p. 1440-1445 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.270-273.1440.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamic Analysis and Fatigue Life Prediction of a Very Flexible Component in Multibody System (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 1597-1600 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Recently, the finite element absolute nodal coordinate formulation(ANCF) was developedfor large deformation analysis of flexible bodies in multi-body dynamics. This formulation is basedon finite element procedures and the general continuum mechanics theory to represent elastic forces.In this paper, a computational method, which predicts the dynamic and structural properties of a veryflexible beam in a multibody system, is presented based on Euler-Bernoulli beam theory and ANCF.In order to consider the dynamic interaction between a continuous large deformable beam and a rigidmultibody system, a combined system equations of motion was derived by adopting absolute nodalcoordinates and rigid body coordinates. The efficiency and reliability of the computational results areverified by comparison with a commercial program. These methods can be applied for predicting thedynamic stress and fatigue life of the wire harness used in a robot system. The process of predictingthe fatigue life using the proposed method in this paper may be applied to continuous mechanicalparts of various dynamic systems
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.1597.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental Study on the Fatigue Strength of the Bogie Frame for Tilting Railway Vehicles (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 590-593 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper shows the experimental study to evaluate the fatigue strength of a bogie framefor Korean tilting train. The various load cases were established based on the international standard(UIC615-4) and the special tilting load case, which is unique in the tilting train, was derived bydynamic analysis and logical assumption of operation under worst tilting condition. The experimentalstudy was conducted by means of two ways, both static and fatigue loading test. Through the staticload test, the safety against fatigue was assessed using Goodman diagram of the material used. Thefatigue load test was carried out up to 1x107cycles. The fatigue strength was assessed by fatigue crackinspection by means of NDT test at the stage of 6x106cycles and 1x107cycles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.590.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Evaluation of the Ride Comfort for High Speed Trains in Korea (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 1589-1592 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Evaluation of the ride comfort for railway vehicles can be divided into two classes; thelong-term evaluation of ride comfort and the momentary evaluation of ride comfort. In the presentpaper, the ride comfort of railway vehicles are investigated for high speed trains in Korea. Thelong-term ride comfort has been analyzed by a statistical method and the momentary ride comfort hasbeen analyzed by using the longitudinal acceleration, the jerk and the stationary lateral acceleration
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.1589.pdf
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