【正文】 .................................................................68 參考文獻(xiàn) ........................................................................................................................ 71 致謝 ................................................................................................................................ 78 山東大學(xué)碩士學(xué)位論文 I Contents Abstract(Chinese)......................................................................................................... Ⅰ Abstract(English) ......................................................................................................... Ⅱ Chapter Ⅰ Instruction .............................................................................................. Ⅰ Property and process characteristics of magnesium and magnesium alloy ........ 1 Impact of alloy elements on AZ31B magnesium alloy....................................... 2 Al ............................................................................................................... 2 Zn .............................................................................................................. 3 Other elements .......................................................................................... 3 The development and application of magnesium alloy ...................................... 3 The application on automobile.................................................................. 4 The application on parts of modern weapons ........................................... 4 The development on aerospace industry ................................................... 5 Other filds ................................................................................................. 5 Modern production of magnesium alloy ............................................................. 5 The plastic deformation machnism of magnesium alloy .................................... 7 Sliding deformation .................................................................................. 7 twinning .................................................................................................... 8 Common plastic processing of magnesium alloy ............................................... 8 Metallographic microscope................................................................................11 The research progress of magnesium alloy AZ31B sheets’formability............ 13 Topic proposing ................................................................................................ 14 Chapter Ⅱ Sheet metal plastic forming finite element simulation ....................... 16 Instruction ......................................................................................................... 16 The choice of yield creterion ............................................................................ 16 The contact and friction of workpiece and mold .............................................. 18 Contact pattern ........................................................................................ 18 Definition of friction ............................................................................... 19 Unit type and Solving algorithm ....................................................................... 19 Deform finite element analysis software .......................................................... 20 Chapter Ⅲ Experimental device .............................................................................. 23 Contents II Stamping formability of sheet metal ................................................................. 23 Erichsen Test / Cupping Test .................................................................. 24 Modified Limit Dome Height Test.......................................................... 25 Limited dome height test device ....................................................................... 25 Chapter Ⅳ Formability of magnesium alloy ........................................................... 31 The sheet thickness ........................................................................................... 31 LHD test result ....................................................................................... 31 Determination of the friction coefficient in DEFORM2D ................... 31 Simulation result .................................................................................... 31 The forming temperature .................................................................................. 39 LHD test result ....................................................................................... 39 Simulation result .................................................................................... 39 The forming velocity......................................................................................... 46 LHD test result ....................................................................................... 46 Simulation result .................................................................................... 46 Lubrication condition ........................................................................................ 51 thickness................................................................................................. 51 Temperature............................................................................................ 51 Velocity .................................................................................................. 51 Conclusion ........................................................................................................ 59 Chapter Ⅴ Double forming process ......................................................................... 61 Preforming height ...............................................................................