【正文】 ........................................................ 37 數(shù)值模擬分析 ........................................................................................ 39 成形速度對極限拱頂高度的影響 ...................................................................42 極限拱頂高度實驗 ................................................................................ 42 數(shù)值模擬分析 ........................................................................................ 43 潤滑條件對鎂合金成形性能的影響 ................................................................45 不同 的板料厚度 .................................................................................... 46 不同的成形溫度 .................................................................................... 47 不同的成形速度 .................................................................................... 49 本章小結(jié) ...........................................................................................................50 第五章 二次成形對鎂合金板料成形性能的影響 ...................................................... 53 預(yù)成形高度對二次成形結(jié)果的影響 ...............................................................53 保溫時間對二次成形結(jié)果的影響 ...................................................................56 鎂合金板料的金相組織 ...................................................................................57 金相樣品的制備 .................................................................................... 57 鎂合金金相分析 .................................................................................... 58 本章小結(jié) ...........................................................................................................62 第六章 結(jié)論與展望 ...................................................................................................... 66 結(jié)論 ...................................................................................................................66 展望 ...................................................................................................................68 參考文獻 ........................................................................................................................ 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 .................