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:电动车凭借着环保、节能和轻便等特性,不断成为未来交通工具的发展趋势,但是锂离子电动车续航能力差等缺陷,制约着其快速发展。而提高锂离子蓄电池模块的安全性和能量密度成为开发出既能够延长电动车的行驶里程又能够解决电动车的安全问题的关键因素。由于隔膜对蓄电池模块的安全性有着重要的影响,因此本文将主要分析蓄电池隔膜、电解质存在的问题,并基于美国国家新能源实验室的丹尼尔道体博士(Dr.DanielHDoughty)发表了名为《电动车用蓄电池模块安全线路图指导》(VehicleBatterySafetyRoadmapGuidance)的报告书,为开发出高能量密度和高的安全性锂电子蓄电池模块提供相应依据。