金属粉末的模压致密化特性

(,110006)Cam2Clay,FelckShima:Cam2Clay,FelckShimaCam2ClayTF124.32Shima[1]Fleck[2],Fleck,ShimaKwon[3],Kim[4]Fleck[5],Fleck,Cam2Clay[6][7,8]Brown[9],,:Cam2Clay11.1ShimaShima[1]Shima:[q/m]2+2.492(1-D)1.028[p/m]2-D5=0(1)p,qMises,D(),mShima,m,Kwon[3]Kim[4]ShimaABAQUSU2MAT[3],:m=156+404.5(pm)0.4885m=150+400(pm)0.48851.2FleckFleck[2]Fleck:5p3py2+5q18py+232-1=0(2)py,py=2.97D2(D-D0)/(1-D0)m;D01.3Cam2ClayABAQUS[6],Cam2Clay91Vol.9Suppl.1TheChineseJournalofNonferrousMetals19997Jul.1999971043:1998-09-14;:1998-12-22,,32,,©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.12(pa-1)2+(tMa)2-1=0(3)t=q/gg=2K/[1+K+(1-K)(r/q)3]a=pc/(1+)pc=pcplvK,0.778K1.0,r,pcplv,,Mpt:t=q=1M=6.7,pc=-0.002+104.48plv-115.37(plv)2+485.18(plv)3M=6.0,pc=-0.11196+214.55plv-1352.0(plv)2+1206.3(plv)3Mpc[9]2[9],11D0=0.63,2D0=0.38,3Cam2Clay1,Shima1(D0=0.63,Brown[5])Fig.1CurvesofrelativedensityhydrostaticpressureofCupowderaftermodel2compressed2(D0=0.38,Brown[5])Fig.2CurvesofrelativedensityhydrostaticpressureofFepowderaftermodel2compressed1Table1PropertiesofpowdermaterialsAlloyAverageparticlesize/mApproximatemorphologyProductionmethodMaximumparticlesize/mApproximateloosepackingrelativedensity/%MH2100Iron45VeryirregularHydrogenreduction1500.38Copper150SphericalGasatomization1800.6304219997©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,Shima,Fleck,,,1,Cam2Clay,Shima3(D0=0.64)Fig.3CurvesofreativedensityhydrostaticpressureofCupowderaftermodel2compressed,Fleck,Cam2ClayCam2Clay,0.64,3,Cam2ClayREFERENCES1ShimaSandOyaneM.IntJMechSci,1976,18:285.2FleckNAetal.JMechPhysSolids,1992,40(5):1139.3KwonYSetal.ComputersGeotech,1988,5:307.4KimKTandKimJS.JMechPhysSolids,1993,40(1):77.5SunXuekun(),ShenYifu()andKimKitai.TheChineseJournalofNonferrousMetals(),1998,8(Suppl.1):132.6HibbittBetal.ABAQUSTheoryManual.Nether2land:ElsevierScienceLtd,Ver5,1996,5.7HillJMandWuYH.JMechPhysSolids,1993,40(1):77.8KimMKandDowneyCL.ComputersGeotech,1988,5:307.9StuartBrownetal.JMechPhysSolids,1994,42(3):383.DIECOMPACTIONDENSIFICATIONBEHAVIOROFMETALPOWDERSSunXuekun,MiaoYuyangandWangGuodongStateKeyLaboratoryofRolling&Automation,NortheasternUniversity,Shenyang110006,P.R.ChinaABSTRACTDiecompactiondensificationbehaviorofmetalpowderswasanalyzed.Cam2Claymodelinrockmechanicswasintroduced,andcomparedwithoften2usedShimamodelandFleckmodel.Fromexperimentalcomparison,itrevealedthatCam2Claymodelcansimulatewelldiecompactiondensificationbehaviorofmetalpowders,whileShimamodelandFleckmodelcant.KeywordsmetalpowderdiecompactiondensificationbehaviorCam2Claymodel()14291:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.