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  • 1
    Electronic Resource
    Electronic Resource
    Formability of Al6061 Extruded Tube in Warm Hydroforming (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 599-604 
    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: Formability of tube in elevated temperature is essential data to design the warmhydroforming process parameters, such as tube diameter, forming temperature and die geometries.Since the quantitative data of forming limit can be used to predict the failure on forming process,formability data available on the FE analysis is one of the very important information for the optimumdesign. In this study, the effect of heat treatment conditions and deformation temperature on theformability was investigated for the warm hydroforming of Al6061 tube. Full annealing andT6-treatment are applied for the heat treatment of Al6061 tubes. To evaluate the hydroformability,uni-axial tensile test and bulge test were performed at temperature ranges between room temperatureand 300oC. The measured flow stresses were used as input parameters for the simulation of warmhydroforming process. The damage value and strain variation during hydroforming are analysed byFEM. A forming limit based on the ductile fracture criteria has been proposed by combining theresults of experimental and FE analysis for the estimation of formability and optimization of warmhydroforming process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.599.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis on Void Closure Behavior during Hot Open Die Forging (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 69-72 
    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: Internal voids have to be eliminated for defect-free in some open die forging. The FEManalysis is performed to investigate the overlap defect of cast ingots during cogging stage. Themeasured flow stress data were used to simulate the cogging process of cast ingot using the practicalmaterial properties. Also the numerical analysis of void closure is performed by using theDEFORMTM-3D. The calculated results of void closure behavior are compared with the measuredresults before and after upsetting, which are scanned by the X-ray scanner. From this result, thecriteria for deformation amounts effect on the void closure were estimated into effective strain of 0.6by the comparison of practical experiment and numerical analysis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.69.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Accommodation of Grain Boundary Sliding in AZ31 Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 581-584 
    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: Mg alloys could be the lightest alloys among the industrially applicable engineering alloys.Since wrought Mg alloy has limited applications due to the poor formability, casting is currently themain processing technique to fabricate Mg components even though wrought alloys are superior interms of mechanical properties and reliability. While a lot of research and development has beenfocused on warm forming under the temperature condition of around 250°C where more formabilitycould be expected, superplastic forming could be another way to get over the low formability of Mgalloys. Like other superplastic materials grain boundary sliding is the main deformation mechanism ofMg superplasticity. Accommodation of stress concentration around triple point of grain boundaryshould be done favorably if grain boundary sliding continues without any fracture. In the present study,superplastic behavior of AZ31 alloys with several grain sizes was examined firstly. Accommodationof grain boundary sliding of AZ31 alloy would be discussed on the basis of grain morphology andtexture evolution after tensile deformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.581.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Plastic Deformation Behavior of Micro-Alloyed Cold Forging Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 61-64 
    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: Micro-alloyed cold forging steel has been developed to rule out heat treatment processbefore forging in order to save energy consumption. These non heat-treated cold forging steelsutilize the work hardening during cold working to ensure the mechanical properties. In other words,the required strength of forged part is achieved by work hardening with the accumulation of plasticstrain during the cold working. Therefore, the plastic deformation characteristics should be carefullyunderstood for successful process design. Evolution of both microstructure and plasticcharacteristics of micro-alloyed cold forging steel has been investigated in the present study. For theoptimization of forging processes, finite element analysis and die life predictions were carried out
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.61.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Warm Forging Characteristics of AZ31 Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 437-440 
    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: Industrial application of magnesium alloys has increased significantly recently. However,wrought magnesium alloys still have a lot of technical challenges to be solved for more applications.First of all, low formability of wrought alloys should be improved by optimizing the processingvariables. In the present study, the effect of process variables such as forging temperature andforging speed were investigated to forgeability of magnesium alloy. To understand the effect ofprocess variables more specifically, both numerical and experimental works have been carried outon the model which contains upsetting geometry. Forgeability of AZ31 alloy was found to dependmore on the forging speed rather than temperature. Forged sample showed a significant activity oftwinning, which was found to be closely related with flow uniformity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.437.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Warm Hydroformability and Mechanical Properties of Pre- and Post- Heat Treated Al6061 Tubes (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 87-90 
    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: Warm hydroformability and mechanical properties of pre- and post- heat treated Al6061tubes were investigated in this study. For the investigation, as-extruded, fully annealed and T6-treated Al 6061 seamless tubes were prepared. To evaluate the hydroformability, uni-axial tensiletest and free bulge test were performed at room temperature and 200ÓC. Also mechanical propertiesof hydroformed part at various pre- and post-heat treatments were evaluated by tensile test. Thetensile test specimens were obtained from hexagonal shaped tube hydroformed at 200ÓC formingtemperature. As a result, hydroformability of fully annealed tube is 25% higher than that ofextruded tube. The tensile strength and elongation were more than 330MPa and 12%, respectively,when hydroformed part was T6 treated after warm hydroforming. However, hydroformed part usingT6 pre treated tube represents low elongation, 8%. Therefore, the T6 treatment after hydroformingfor as-extruded tube is proved to be the most cost-effective among various processing conditions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.87.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Cavitation Behavior of Ultra-Fine Grained Ti-6Al-4V Alloy Produced by Equal-Channel Angular Pressing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 621-626 
    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: Cavitation behavior during superplastic flow of ultra-fine grained (UFG) Ti-6Al-4V alloywas established with the variation of grain size and misorientation. After imposing an effectivestrainup to 8 via equal-channel angular pressing (ECAP) at 873 K, alpha-phase grains were markedlyrefined from 11 μm to ≈ 0.3 μm, and misorientation angle was increased. Uniaxial-tension tests wereconducted for initial coarse grained (CG) and two UFG alloys (ε = 4 and 8) at temperature of 973 Kand strain rate of 10-4 s-1. Quantitative measurements of cavitation evidenced that both the averagesize and the area fraction of cavities significantly decreased with decreasing grain size and/orincreasing misorientation. It was also found that, when compared to CG alloy, cavitation as well asdiffused necking was less prevalent in UFG alloys, which was presumably due to the higher value ofstrain-rate sensitivity. Based on the several theoretical models describing the cavity growth behavior,the cavity growth mechanism in UFG alloys was suggested
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.621.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Active-passive mode-locked Nd:YAG laser with a saturable absorber centered in a Fabry–Perot cavity (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1464-1466 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have found that the use of a saturable dye cell, placed at the center of a Fabry–Perot cavity, produced more stable mode-locked pulses without satellite pulses than a contacted dye cell configuration in active-passive mode locking of a pulsed Nd:YAG laser. The mode-locked pulse width was measured to be 23 ps and the energy stability of its frequency-doubled output was within ±3%. The displacement of the dye cell position from the exact center of the cavity was found not to be critical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105198
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