不锈钢超薄板成形性能及其微尺度效应评估

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1、万方数据不锈钢超薄板成形性能及其微尺度效应评估越微小其尺度效应表现程度越大，根据评估结果能够计算考虑尺度效应的微拉深工艺参数。关键词：304不锈钢；微尺度效应；成形极限；微拉深；相似精度万方数据江苏大学硕士学位论文ABSTRACTThewholeorpartialminiaturizationofmicroformingproductsbringsaverybigdifferencebetweenmaterialforminglawandtraditionaldeformationofmaterialformingprocess．Some

2、times，someparametersofmicroformingprocesscankeepacertainproportionaccordingtotheproportioncoefficientchangelawofzoom，however,themicrostructure，surfacemorphologyisunchanged，whichmadethematerialformability,frictioneffectandotherfactordifferent．Thisstudyfocusedon304stainless

3、steelultrathinplateof201上m，50rtm，1001xm，2001maand400profivedifferentthickness，analyzedthemechanicalpropertiesandsizeeffectthroughuniaxialtensiletest；gottheanisotropicofdifferentthicknessofthinplatespecimenthroughanisotropictest；throughuniaxialtensiletest，analysisof304stai

4、nlesssteelthinplatemechanicalpropertyandsizeeffect；establishedthefiniteelementmodelofthinplatespecimenswithdifferentthicknessandtheforminglimitpredictioncurve；obtainedthepositiveornegativeeffectaccordingtotheassessmentresultstocalculateparametersofmicrodeepdrawingprocessb

5、ythesimilarityprincipleofthinplateinmicroscale．Thetensiletestandanisotropictestresultsshowthat，forthe304ultrathinstainlesssteelsheetwithdifferentthickness，withspecimenthicknessdecreasing，itemergedmechanicalpropertiessizeeffect；mechanicalpropertiessizeeffectofultrathinplat

6、ewithdifferentwidthwasnotobvious．Tensilememberappearedraptureindifferentwayswiththechangeofthesamplewidthandthickness，andthestretchformingpropertieswasrelatedtothesmalleroneofthewidthandthickness；theanisotropicdegreeenhancedwithultraminplatethicknessdecreasing．Finiteeleme

7、ntpredictionofforminglimitpredictionshowthat，theforminglimitofletthalfareabasedonthemethodofmaximumloadandtheforminglimitofrighthalfareabasedstrainpathmethodwereconsistentwiththeexperimentalresults，SOusingcomprehensivejudgmentmethodastheunstablelimitstrain，finallyobtained

8、theforminglimitcalvesoffivedifferentthicknessesultrathinplatesbasedoncomprehensivemethod．Microde