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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
    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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  • 7
    Electronic Resource
    Electronic Resource
    Development of a Visual Monitoring System for Deformation Measuring of Welded Members and its Application (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 557-560 
    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: Recently, in the loading tests for steel members, the deformation value is measured bycalculating a distance of both cross-heads. This measuring method encounters a test error due tovarious environmental factors, such as initial slip, etc.. Especially, in the case of welded members,the non-uniform deformation behavior in welded joints is observed because of the effect of weldingresidual stress and weld metal. This is mainly responsible for a test error and a loss of the reliabilityfor used test instruments. Therefore, to improve the accuracy and the applicability of measuringsystem, it is necessary to employ a visual monitoring system which can accurately measure the localand overall deformation of welded members.In this paper, to accurately measure a deformation of welded members, a visual monitoring system(VMS) was developed by using three-dimensional digital photogrammetry. The VMS was appliedto the loading tests of a welded member. The accuracy and the applicability of VMS was verified bycomparing to the deformation value measured by a test instrument (MTS-810). The characteristicsof the behavior near a welded joint were investigated by using VMS
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.557.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    A Rate-Dependent Hysteresis Model for Structural Steel (SM490) Considering the Coupled Effect of Strain Rate Hardening and Temperature Rise (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 581-584 
    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 steel structures, the mechanical characteristics and the hysteretic behavior duringdynamic behavior is different to those during static deformation. This is due to the coupled effect ofstrain rate hardening and temperature rise. To predict hysteretic behavior of steel structures underdynamic/cyclic loading such as earthquake, it is therefore necessary to develop a rate-dependenthysteresis model which can accurately describe the static-dynamic mechanical characteristicsconsidered the coupled effect of strain rate hardening and temperature rise as well as the hystereticbehavior.In this paper, to develop a rate-dependent hysteresis model of SM490(structural steel according toKorean standard), the monotonic and cyclic loading tests were performed for strain rate. Based onthe test results, the rate-dependent hysteresis model of SM490 was formulated and with the materialparameters used, the model was derived. The validity and the accuracy of the developed modelwere verified by comparing between the analyses and the experiments. The comparison resultsshow that the rate-dependent hysteresis model of SM490 developed by the authors can accuratelypredict the static-dynamic hysteretic behavior of steel structures under cyclic loading
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.581.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Characteristics of the Static and Dynamic Behavior of Steel Piles with a Welded Joint (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 613-616 
    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: During welding process to make joints, residual stress is inevitably produced and weldmetal should be used. These influence the static and dynamic behavior of steel structures with weldedjoints, such as steel piles. In steel structures, dynamic mechanical behavior is different to staticmechanical behavior. Therefore, to accurately predict the behavior of steel piles with a welded jointunder static-dynamic loading, the research on influence of a welded joint on the static and dynamicbehavior of steel piles is necessary. For that purpose, a rate-dependent plasticity model was used,considering strain rate hardening and temperature rise.In this paper, the distribution of welding residual stress in a welded joint was computed by usingthree-dimensional heat conduction analysis and three-dimensional thermal elastic-plastic analysis.The behavior of steel piles with a welded joint under axial static and dynamic loading wasinvestigated by using three-dimensional elastic-plastic finite element analysis, which employed arate-dependent plasticity model and included residual stress and mechanical properties of weld metalin a welded joint. The rate-dependent plasticity model used in this paper is proposed by the authorsbased on the static-dynamic loading tests. Numerical analysis results of steel piles with a welded jointwere compared to those without a welded joint. In comparison, the characteristics of static anddynamic behavior of steel piles with a welded joint were investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.613.pdf
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