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1、MaterialsScienceandEngineeringA267(1999)43±49Analysisofcoldcompactiondensi®cationbehaviourofmetalpowdersXue-KunSuna,*,Shao-JieChena,Jian-ZhongXua,Li-DongZhena,Ki-TaeKimbaStateKeyLaboratoryofRollingandAutomation,NortheasternUni6ersity,Shenyang110006,People'sRepublicofChinabDepartmentof
2、MechanicalEngineering,PohangUni6ersityofScienceandTechnology,HyojaDongSan31,Pohang,SouthKoreaReceived15July1998;receivedinrevisedform18January1999AbstractColdcompactionbehaviourofmetalpowderswasanalyzedusingShima,FleckandCam-Claymodels.TheCam-Claymodelre¯ectsaverydifferentplasticdefor
3、mationmechanismforporousmaterialswhencomparedwithothertwomodels.Brown'striaxialcompressiveexperimentaldata(loadingstates:1:1:1,1:0.4:0.4,1:0:0)wereemployedasthearbitertotheseplasticmodels.ItisveryclearthatonlytheCam-Claymodelcansimulatewellallexperimentaldataunderdifferentloadingstate
4、sforironandcopperpowders,whileShimaorFleckmodelcannot.ThereforetheCam-Claymodelisrecommendedtobeusedtoanalyzecoldcompactiondensi®cationprocessofmetalpowders.©1999ElsevierScienceS.A.Allrightsreserved.Keywords:Coldcompaction;Metalpowders;Cam-Claymodel1.IntroductionOthermodels,includingt
5、hatofFleck[9],arealsobasedon®rstandsecondinvariantsandresembletheseInrecentdecades,powdermetallurgytechnologyisellipticalshapesinwhichthedeviatoriccontributionbeingdevelopedheavily.OnemeritofP:Misnearnetincreaseswithdecreasinghydrostaticstress.Hereweshapeforming[1±4].GenerallyP:Mformi
6、ngprocesssimplycallittheFleckmodel.IntheFleckmodel,theincludescoldcompaction,sinteringand®nishing.parametersarederivedtheoretically,andnotfromManyplasticmodelshavebeendevelopedforcoldexperiments.compactionofpowdermaterials.ThemodelwhichisRecentlysomeresearcherspresentedanewviewpointof
7、tenemployedassumesthatpowdercontinuumyieldswhichisverydifferentfromthatoftheShimaandasafunctionofthe®rstinvariantofstressstateI1,andFleckmodels.Brown[10]believedthatforpowderthesecondinvariantofdeviatoricstressstateJ%2[5±7]:materialsthetransitioninyieldsurfacefromanincreas-ingdeviator
8、icstr
