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  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of High Temperature Tensile Properties and Residual Stresses in Welded Joints of the SM570-TMCP Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 527-532 
    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: TMCP steels produced by thermo-mechanical control process are now spot lighted due tothe excellent combinations of strength, toughness and weldability. Recently, in Korea, high strengthSM570-TMCP steel whose tensile strength is 600MPa has been developed and applied to steelstructures due to its excellent nature. But, for the application of the TMCP steel to steel structures, it isnecessary to elucidate not only the material characteristics but the mechanical characteristics ofwelded joints. In this study, high temperature tensile properties of the SM570-TMCP steel wereinvestigated through the elevated temperature tensile test and the characteristics of residual stresses inwelded joints of the TMCP steel were studied through the three-dimensional (3-D) thermalelastic-plastic finite element (FE) analysis on the basis of mechanical properties at high temperaturesobtained from the experiment. The results are then compared with the conventional quenched andtempered high strength SM570 steel
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.527.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of the Welded Joint on the Mechanical Behavior of Steel Piles during Static andDynamic Deformation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 1469-1472 
    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: During manufacturing the welded joint of steel structures, residual stress is produced and weldmetal is used inevitably. And residual stress and weld metal influence on the static and dynamic mechanicalbehavior of steel structures. Therefore, to predict the mechanical behavior of steel pile with a welded jointduring static and dynamic deformation, the research on the influence of the welded joints on the static anddynamic behavior of steel pile is clarified.In this paper, the residual stress distribution in a welded joint of steel piles was investigated by usingthree-dimensional welding analysis. The static and dynamic mechanical behavior of steel piles with a weldedjoint is investigated by three-dimensional elastic-plastic finite element analysis using a proposed dynamichysteresis model. Numerical analyses of the steel pile with a welded joint were compared to that without awelded joint with respect to load carrying capacity and residual stress distribution. The influence of thewelded joint on the mechanical behavior of steel piles during static and dynamic deformation was clarified bycomparing analytical results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1469.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Residual Stress and Weld Metal on Hysteretic Behavior of a Welded Tubular T-Joint (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2077-2080 
    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: During the welding process to make welded joints, residual stress is inevitably generatedand weld metal is used. Welding Residual stress is influenced on the behavior of welded joints undermonotonic and cyclic loading. And the weld metals used in welding process have differentmechanical characteristics than structural steels. Therefore, to accurately predict the hystereticbehavior of welded joints, the effect of residual stress and weld metal must be investigated.In this paper, the residual stress distribution in a welded tubular T-joint was investigated bycarrying out three-dimensional non-steady heat conduction analysis and three-dimensional thermalelastic-plastic analysis. To consider a effect of base metal(SM490) and weld metal(E71T-1), a cyclicplasticity model was formulated based on monotonic and cyclic loading tests. And the formulatedmodel was applied to three-dimensional elastic-plastic finite element analysis. The effect of residualstress and weld metal on hysteretic behavior of a welded tubular T-joint was investigated by carryingout numerical analyses considering residual stress and cyclic plasticity model of base metal and weldmetal respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2077.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental Investigation on the Fatigue Strength of the Replacement Repair Welded Joints (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 355-358 
    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: In recent years, the replacement repair welding, which repairs damaged steel girder bridgesby replacement of the damaged sections with new steel plates through cutting and welding underin-service conditions, is spotlighted for its brilliant features, i.e. it can be achieved without incurringtraffic dislocation. However, the mechanical behavior of the welded joints under cyclic loads due tothe traffic which passes along the girder bridges is not clarified. In this paper, the fatigue strength ofthe replacement repair welded joints was investigated in order to improve reliability in the repairwelded joints. Steel plate was extracted from the old steel girder bridge; then was welded with newsteel plate to construct specimen with the replacement repair welded joints. Flux Cored Arc Welding(FCAW) process was used to fabricate the double "V" butt joints. Fatigue tests were conducted usinga servo hydraulic controlled 50tonf capacity UTM with a frequency of 5Hz under constant amplitudeloading. The fatigue strength of the replacement repair welded joints was analyzed in detail
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.355.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Vibration during Welding on the Fatigue Strength of Structural Steel Weldments (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1329-1332 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: During repair welding of steel bridge under service load, vibration occurs due to thedynamic loads like wind and vehicles, etc. However, the effect of vibration during welding on thefatigue strength of weldments is not yet clearly understood. In this paper, the effect of vibrationduring welding on the fatigue strength of structural steel weldments was investigated in order toimprove reliability in the repair welded joints of steel bridge. The base material used in thisinvestigation was SM 490A steel of weldable grade. Flux Cored Arc Welding (FCAW) process wasused to fabricate the single ‘V’ butt joints. Welding was performed on the steel under themechanical vibration of given frequency. The applied frequency was resonant frequency. Also,weldments under no vibration during welding were prepared. Fatigue tests were conducted using aservo hydraulic controlled 50tonf capacity UTM with a frequency of 5Hz under constant amplitudeloading. Effect of vibration during welding on the fatigue strength of weldments was analyzed indetail
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1329.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Reliability Evaluation of QFP Solder Joint Using Sn-8Zn-3Bi Solder Paste during the Thermal Shock Test (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 247-250 
    Details
    ISSN: 1662-9752
    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: The reliability of QFP (Quad flat package) solder joint using Sn-8Zn-3Bi solder pasteunder the thermal shock test was investigated. Considering the environmental restriction such asROHS, the QFP Cu LF (Lead-frame) was coated with lead-free materials (Sn, Sn-3Bi). To analyzethe reliability under thermal shock treatment, the samples were placed in the thermal shock chamber(248K/423K, Dwell time: 30min). During the thermal shock test, the solder joint cross-sectionswere observed every 500 cycles. No crack initiation and propagation was observed through all typeof plated Cu LF. The measured pull strength slightly decreased, as the number of cycles increased.After 1000 cycles, the pull strength of Sn and SnBi plated Cu LF reduced by 30% and 20%,respectively, compared with that of initial condition. Observing the fracture surface morphology byFE-SEM, the fracture mode changed and the IMC fractured area on the both fracture surface wasincreased. The IMC was identified as γ-Cu5Zn8 by chemical composition analysis using EDS. Thereduced pull strength was affected by IMC fracture and fracture mode change. However, the pullstrength does not decrease steeply but gradually. Consequently, the Sn-8Zn-3Bi solder joint showsthe reliable solder joint strength, fracture mechanism, and compatibility with lead-free plated Cu LFduring the thermal shock temperature of 248K to 423K
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.247.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    J-Integral Estimation for the 3-D Through-Thickness Centre-Cracks in Welds of Structural Steels (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 125-128 
    Details
    ISSN: 1662-9752
    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: For the fracture analysis of a crack in welds, residual stress analysis and fracture mechanicsanalysis must be performed sequentially. In this study, characteristics of residual stresses in welds ofstructural steels (SM490, SM520, SM570) were presented by carrying out three-dimensional (3-D)thermal elastic-plastic finite element (FE) analysis. Then, an FE analysis method which was able tocalculate domain-independent values of the J-integral for a crack in a 3-D residual stress bearing bodywas developed to evaluate the J-integral for a mode-I centre-crack in welds of structural steels whenmechanical stresses were applied in conjunction with residual stresses. The results show that thelongitudinal residual stresses in welds increase with increasing yield stress of the welded steel(SM490〈SM520〈SM570). For the through-thickness centre-cracks in welds of structural steelswhere only residual stresses are present, the J-integral values increase with increasing yield stress ofthe welded steel. This is because the longitudinal residual stresses in welds, which in this case act asthe crack driving force, increase with increasing yield stress of the welded steel. Furthermore, thevalues of the J-integral for the case when mechanical stresses, applied in conjunction with residualstresses, are larger than those for the case when only residual stresses are present. This is becausetensile stresses by mechanical loading are added to the existing residual stresses; hence the crackdriving force is larger
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.125.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Weldability Studies on the Replacement Repair Welded Joints of a Damaged Steel Bridge (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 655-658 
    Details
    ISSN: 1662-9752
    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: In recent years, the replacement repair welding, through which damaged bridges arerepaired by replacing of the damaged sections with new steel plates through cutting and weldingunder in-service conditions, has been highlighted for its brilliant features i.e. it can be achievedwithout incurring traffic dislocation. However, the validity of the repair method is not fully verifiedbecause of its lack of safety and reliability. Moreover, repair method by welding inevitably involvescutting and welding process, and the weldability of the replacement repair welded joints has not yetbeen clarified. In this paper, the weldability of the replacement-repair-welded joints wasinvestigated in order to improve reliability in the repair welded joints of the aged steel bridge. ASteel plate was extracted from the steel bridge after the period of prolonged service, and waswelded with a new plate, using replacement repair welding technique, in order to construct aspecimen. Flux Cored Arc Welding (FCAW) process was used to fabricate the double "V" buttjoints. Welded joints were characterized on the basis of chemical composition analysis, hardnesstest and micro-structural analysis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.655.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Selection of Proper Fatigue Model for Flip Chip Package Reliability (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 502 (Dec. 2005), p. 393-398 
    Details
    ISSN: 1662-9752
    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: There have been diverse fatigue models and approaches to properly estimate solder joint reliability. However, it is one of the most difficult problems to determine which solder constitutive models and fatigue models can be applied best. In this paper, both viscoplastic and elastic-plastic-creep solder constitutive models could be utilized to calculate accumulated inelastic response under 208 K to 423 K(-65 ℃ to 150 ℃) thermal cycling condition. And two different fatigue models, Darveaux and creep-fatigue model were applied to find solder joints fatigue life for flip chip assembly. Moreover, each fatigue life was compared to experimental result for the validation of finite element analysis. The actual number of cycles to failure was obtained from cross sectional view of the package with SEM
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.502.393.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    An Investigation on Wetting Characteristics of Solder Particle for Solderable Electrically Conductive Adhesives (ECAs) (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 217-220 
    Details
    ISSN: 1662-9752
    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: A novel electrically conductive adhesives (ECAs) with solder particle have beendeveloped. The kinetics of the curing reaction were investigated using isothermal differentialscanning calorimeter (DSC). The dynamic DSC scans were also conducted to investigate thetemperature dependant curing degree. The temperature dependant viscosity characteristic ofpolymer was investigated using rheometer. The wetting characteristic of two solders on two kindsof metals were investigated using an optical microscope. It was found that developed resin materialshowed good fluxing capacity against Sn-Bi solder on Ni/Au and the wetting angles was about 24º
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.217.pdf
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