简介：Tooptimizetheprocessparameters,itisnecessarytoexactlypredictfailuremodesduringdeepdrawingofcoatedmetalsheets,wheretwomainfailureformsarefractureandwrinkling.Inthispaper,finiteelementsimulationsbasedoncontinuousdamagemechanicswereusedtostudythefailurebehaviorduringacylindricaldeepdrawingofmetalsheetswithnickelcoating.Itisshownthattakingtheeffectofblankholderforceintoaccount,thesetwofailuremodescanbepredicted.Thesimulationresultsarewellconsistentwiththatobtainedfromexperiments.

简介：Thehydrodynamicdeepdrawingprocessenablesnetshapeornearnetshapeformingofcomplicatedsheetmetalpartsmadefromdifficultlyformingmaterials,suchasaluminiumorhighstrengthsteels.Basedontheconventionalhydrodynamicdeepdrawingprocess,anewprocess,hydrodynamicdeepdrawingprocess,inwhichradialpressureisappliedtotherimoftheblank,isproposed.ThisnewprocesshasbeenanalysedusingFEMsimulationsandtheobtainedresultshavebeencomparedwiththeexperimentalresults.ThematerialusedintheexperimentswasAl-Mg-Sialloy,andintheFEM-simulationstheelastic-plasticbehaviourofAl-Mg-SialloywasmodelledusingBarlat's89yieldcriteria.

简介：Atfirst,aseriesoffiniteelementmethod(FEM)simulationtestswereusedtofindthecriticalformingconditionsofhot-galvanizedsheetsteelduringtherectangularboxdrawingprocessingwhenconstantblankholderforceswereapplied.Accordingthetestresults,thereasonablealterationscopeofinitialvariableblankholderforce(VBHF)wasas1.9～2.3T.Then,basedonthetestproductionsofblankholderforce,12typicalVBHFcurveswereappliedtoperformthesimulationtestsbythesimulationsoftwareofDYNAFORM.ThesimulationtestresultsshowedthatVBHFhadgreateffectsondrawingformabilityofhot-galvanizedsheetsteelduringtherectangularboxdrawing.However,thedifferentVBHFcurveswereappliedtocontrolthewholedrawinganditwouldgetgreatdifferenteffects.Atthesametine,theVBHFhadgreateffectsonthemaximumthickthinningratio,buthadlittleeffectonthemaximumthickincrassationratio.So,reasonableapplicationoftheVBHFwouldgreatlydecreasethefractures.WhentheVBHFprofileistakenascurveL,thebesteffectofdrawingformabilitycouldbeobtained.WhencurveIisused,contraryeffectcouldbegotten.TheothertypesofcurveswouldcauseeffectsbetweenabovetwotypesofVBHFcurves.Finally,theactualtestswereappliedtocheckthevalidityoftheFEMsimulationtests.TheresultsshowthattheFEMsimulationtestsaregoodwaysforpredictingandoptimizingtheVBHF.

简介：AlN降水和再结晶质地上的一个电场的效果被调查。滚动寒冷的08Al杀死了钢表根据二拍子的圆舞过程在550degC被退火，在各种各样的维持的时间，有或没有使用一个电场。电场支持第二个阶段(AINparticles)的降水，这被发现，加强7纤维并且削弱在recrystallizedspecimens的cc纤维质地部件。对由电场的7纤维质地的加强的可能的解释是第二个阶段艾因河粒子在损坏不同地面向的谷物的情况下支持7纤维的生长。