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  • 1
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Warm Deep Drawing of AZ31 Magnesium Alloy Sheet with Variable Blank Holder Force (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 639-644 
    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: Blank holder force (BHF) plays an important role in sheet metal forming. Previousstudies demonstrated that variable blank holder forces can improve the cold formability ofsteel blank, but the research on the application of variable blank holder force in warm formingof magnesium sheet forming has not been well investigated. In this study, the mechanicalproperty of AZ31 magnesium alloy sheet is measured through some uniaxial tensile tests. Inorder to obtain the variational rule of the BHF, a mathematical model of BHF is deducedbased on the energy theory. The variational rule of the BHF over the punch stroke is analyzed.Finally, three profiles of the BHF curve are designed, and the numerical simulation of warmdeep drawing process of magnesium alloy sheet is also performed. A suitable variable blankholder force scheme is obtained through comparison among three results of simulation. Thesimulation indicates that the limiting drawing ratio of AZ31 magnesium alloy sheet can beimproved from 3.0 to 3.5 with the suitable blank holder force varied by an inverted V curve
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.639.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermo-Mechanical Coupled Simulation of Warm Stamping of AZ31 Magnesium Alloy Sheet (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 281-284 
    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: Uniaxial tensile test of a cross rolled magnesium alloy sheet was conducted under differenttemperatures and strain rates. The mechanical propriety of AZ31 magnesium alloy sheet wasanalyzed according to the true strain-stress curves. Then the non-thermal drawing process, duringwhich the temperature of die, blankholder and blank is 200℃ while the punch is kept at roomtemperature, was simulated by the thermo-mechanical coupled finite element method. Thedeformation behavior and the temperature change in the drawing process was investigated. Due to theheat conduction, there was non-uniform distribution of temperature along flange area, force transferarea and deformation area. Therefore the resistance of the force transfer area is enhanced and thewarm formability of magnesium alloy sheet can be further improved. The thermo-mechanicalcoupled simulation provides a good guide for the development of non-isothermal drawingtechniques
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.281.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental Research on Warm Deep Drawing of Magnesium Alloy Sheet by Variable Blank Holder Force Control (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 285-288 
    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 process of warm deep drawing of magnesium alloy with variable blank holder force hasbeen presented in this study. A hydraulic press that can realize adjustable blank holder forces wasdeveloped and its working principle and control system introduced. A warm deep drawing mould wasfixed and warm deep drawing experiments are conducted on the hydraulic press. Different variationschemes of the blank holder force with the stroke of the punch was tested, and compared withexperiment results. The experimental results show that adopting the variable blank holder forcetechnique can remarkably improve the forming performance and decrease the reduction ratio ofthickness from 15.21% to 12.35%. It is further demonstrated that the suitable blank holder forcevariation scheme is an inverted V curve with the punch stroke
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.285.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Numerical Analysis of Nano- or Micro-Crystalline Materials during ECAP by Dislocation Evolution Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 687-690 
    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: By the severe plastic deformation, the equal channel angular pressing method (ECAP) hasbeen used for producing metal materials with the ultra-fine grain size and specific mechanicalproperties, in particular high yield strength. Analytical approaches have also been studied by fewresearchers. However, none of the previous analyses have taken into account the strain hardening ofthe material by considering the microstructure evolution. In this paper, the deformation behavior andthe strain harden of aluminum during equal channel angular pressing was calculated on the basis of adislocation evolution model. Then simulated stress, strain and strain distribution and strain hardeningwere analyzed. The strain is seen to rapidly increase when the material passes the shear area. Thismakes a maximum value of stress. And for the congregation of dislocation density, the maximal valueof strain increase with the process continuing
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.687.pdf
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    Paper (German National Licenses)
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