VDA–xxx blatt) August AugustPl?ttchen-Biegeversuchf rmetallischeHalbzeugePlatebendingtestformetallicsemi-finishedmaterials

目

Thistestspecificationdescribeshowtoperformtheplatebendingtestandhowtodeterminethebend- sionsabouttheformingbehavior andthesuscepti- tofailure hemmingoperations)orduringcrashloads.適用范

Thistestspecificationappliestothemodifiedplatebendingtestonmetallicspecimenslikehigh-strengthsteel,aluminum-ormagnesium-alloys.R Punchforcein Punchdisplacementinmm Rollerdiameterinmm Rollerdistancein Rollerradiusin Samplethicknessin Samplewidthin Samplelengthin PunchradiusinmmBendingangle R Tensilestrengthin測試設(shè) Test配備低摩擦安裝的支輥的彎曲裝置（1彎曲沖頭（圖2）

Universaltestingmachinewithsupportforthebendingdevice rollersupports(Figure1)Bendingpunch(Figure2)Anglemeasuringdevice樣 FortsetzungSeite2bisContinuedpage2topage13VERBANDDERAUTOMOBILINDUSTRIEE.V.(VDA) Behrenstr.3510117BerlinVertrieb:DOKUMENTATIONKRAFTFAHRTWESENE.V.(DKF) e14,D-74321Bietigheim-Bissingen,www.dkf-Seite Page VDAxxxAugust2010 VDAxxxAugust試樣制 Sample常規(guī)制 General 60mm×60mm。如果所需的情況是試樣寬度b20*樣品厚度a。測試機(jī)構(gòu)和客

reducedafterpriorapprovalbythecustomer,ifthe Inordertominimizetheinfluenceofthethree- widthmustexceedthe samplethickness b≥20*sample a.Aminimum agreed institute customerbymeansofdeliveryspecificationsor beremoved thespecimenThemeasuredvaluesshallbeusedonlyifthecrack dependenceofthematerial,byreworkingtheedgesbymeansofmilling,grindingor制備用于測定彎曲性和折疊性的樣 Preparationofsamplesfortheofbendabilityand180°而不失效。這些材料可以在彎曲試驗(yàn)之 250mm，寬度為70mm的片 1。預(yù)應(yīng)變和彎曲之 60mm x60mm的

intheas-supplied qualities)canbebentinthebendingtestbyalmost180° be thebending test inorder isperformedonsheetmetalstripswithalengthof250mmandawidthof70mm,eachtakenfromtheproductaccordingtothelatermain(bending)straindirection.Thus,thepre-strainisappliedverticallytotheorientationofthebendingline.Thepre-parametersareto betakenfromTable1. dimensions60mmx60mmcanbetakenfromthecenterareaofthepre-strainedsheetmetalstrip.A distribution 參數(shù)/ 值/樣品尺寸長度x)Samplesize(lengthxwidth)預(yù)應(yīng)變/ Al板材/Al-Al擠壓型材/Alextrusion鋼板/steel (Rm<580

250mmx70SeiteSeite VDAxxxAugust2010VDAxxxAugust鋼板/steel (Rm≥580PrestrainingFreelengthbetween

251501:Table Prestraining

samples isthe Ifthe deviationfromthepre-strainingdirectionispossible.樣品名 5.2Sample /條件，采樣必須符合下述規(guī)范（特性）。特性要用下劃線（“_”） 名。如果使用了內(nèi)部命名條例，則必須對其進(jìn)行記錄以下編號1至10的特征。:B=:(標(biāo)準(zhǔn)命名,對于非標(biāo)準(zhǔn)化材料，必須使用商業(yè)化命名):U=無涂層Z熱浸鍍鋅ZE=電鍍鋅ZF=熱鍍鋅AS=鍍鋁AB=:L= 擇優(yōu)取向(軋制或擠壓方向 )的縱向,Q=擇優(yōu)取向(軋制或擠壓方向)的橫向,D=擇優(yōu)取向(軋制或擠壓方向)的對角線方向,0=:(:L,Q,D(相對于擇優(yōu)取 :O=W1=熱處理后(170C/20min)

designation/condition,sampletakingmustcomply beseparated (,_“ designations the mittediftherequiredclearandunambiguous isensured. Ifinternal usedthesemustbedocumentedandmadeavaila- Inadditiontothetestingresultsandtheevaluationmethodthefollowingcharacteristics1to10havetobedocumentedforeachtestseries.Designation:B=BendingDesignation:Material(standarddesignation,fornonstandardisedmaterialsthecom-mercialdesignationhastobeused)Designation:SurfaceU=noZ=hotdipgalvanisedZE=electrogalvanizedZF=galvannealedAS=AB=otherDesignation:Directionofpre-L=longitudinaltopreferentialdirection(rolling-orextrusiondirection),Q=transversaltopreferentialdirection(rolling-orextrusiondirection), (rolling-orextrusiondirection),0=withoutpre-strainingDesignation:Pre-strainin(withoutDesignation:Testing Designation:HeatO=withoutheatW2=熱處理后(175C/15min)

W1=heattreated

C/20min)Wx=

W2=heattreated

C/15min):測試溫度(單位為233,296,:(作為小數(shù)位:a,b,c,舉例:對等級為HC340X+ZE 5％的預(yù)應(yīng) ;使用半徑為0.2mm的彎曲沖頭，在296K（室溫）下進(jìn)

=heat thecustomerDesignation:Testtemperature(inKelvin)233,296,373Designation:Punch(asdecimalDesignation:Numberoftheparallela,b,c, AbendingtestwithsteelgradeHC340X+ZEhasbeenperformed.Thematerialwaspre-strainedby5%paralleltotherollingdirection,wastested transversaltotherollingdirectionandwasnotheattreated;thetestwasperformedat296K(roomtemperature) usingabending 0,2mm.Itwasthethirdparalleltest.:文件名中的簡稱必須符合最新標(biāo)準(zhǔn)。數(shù)據(jù)頭中的簡稱（見附錄D）未更新。如果知道擇優(yōu)取向（軋制或擠壓方向）， 3）。如

Annotation:Theshortnameinthefilenamemustbeadaptedtothelateststandard.Theshortnameinthedataheader(seeAppendixD)isnotupdated.Thesamplesmustbeletteredbymeansofacoloredpenwherebytheletteringmustnotactasa unambiguousallocationisensured. amarker pen(seeFigure 3).If exhibit permanent intheanalysisofthetestresults.TestNumberof必須進(jìn)行三 3）次軋制或擠壓方向的有效試驗(yàn) 如果需要更高精度的平均值，樣本數(shù)可能超過5。這2602）。

Three(3)validtestsperrollingorextrusion test tothe angle2additionaltestsmustbeperformed.Ifabove ofsamples berealized volumemaybereduced.ThismustbeagreedwiththecustomerIfahigher ofthemean isrequiredthenumberofsamplesmayexceed5.Thiscanbeestimatedbymeansoftheconfidenceinterval(95%probability,refertoISO2602).制

Thebendingdevicemustbepositionedinthetensiletestmachinesuchthattherollersarearrangedcentrallyandinparallelunderthebending 試驗(yàn)力，N/punch in 下壓距離，mm/punchdisplacement inmm 支輥直徑，mm/rollerdiameter inmm 支輥距離，mm/rollerdistance inmm 樣品長度，mm/sample in 樣品厚度，mm/sample inmm 樣品寬度，mm/samplewidth inmm 沖頭半徑，mm/punch in 彎曲角度，°/bending 圖1:Figure Schematicillustrationofthebending

2 Furthermore,thebending punchmustbedesignedsuchthat,whiletesting,thesamplehascontactwith dimensionsserveasorientation.Abbildung Figure Schematicillustrationofthebending1）。建議放置樣品時，使得可能存在于邊緣處的

onboth samplessuchthatcuttingburrsorfracturesurfaceportionspossiblyexistingattheedgeslieatsidefacingawayfromthepullforce,i.e.atthesideofthe

3:Figure Sampleorientationrelativetobending參數(shù)/ 值/樣品厚度a/Samplethickness 材料厚度/material樣品寬度b/Samplewidth 60樣品長度l/Samplelength 60支輥直徑D/rollerdiameter 30沖頭半徑r/punchradius鋼/steel(Rm≥780鋼/steel(Rm<780鋁及鎂合金/Al-andMg-支輥距離L/rollerdistance鋼/鋁及鎂合金/Al-andMg-

2mm a>2mm0,4mm0,2 0,40,2 0,42xa+0,52x1:Table Parametersofbending步 彎曲試樣在試驗(yàn)裝置中進(jìn)行彎曲，沒有潤滑劑， 30N（60N分別）。當(dāng)彎曲角度根據(jù)附錄A來確定時，可以在稍后的時間選擇終止測試。彎曲

andsupported onpivoted aspossible. would beasuitable is of30N(or60N,respectively)afterthemaximumforcehasbeenreached.WhenthebendingangleisdeterminedaccordingtoAppendixAthereistheoptionthatthetestmaybeterminatedatalaterpointintime.Bendingpathandforceare In aformingpropertycaremustbetakentocontinuethetestonlyaslongasunimpairedbendingisAsecondshut-offcriterionfor themaximumpunch inorder toavoid and such anglescanbeachieved.參數(shù)/ 值/預(yù)處理速率/velocitytopre- 10預(yù)處理力/pre-force 2mma>2mm

30100測試速率/test 20強(qiáng)制關(guān)閉閾值/forceshut-offthreshold 2mma>23Table Parametersfortest

3060

Acomparison ofthe device ofthe 分 彎曲角度可以通過彎曲沖孔的位移計(jì)算得到（A）或由手動測量樣品來確定根據(jù)標(biāo)準(zhǔn)（附錄

Thebendinganglecaneitherbecalculatedfromthedisplacementofthebendingpunch(AppendixA)orbedeterminedbymanualpostmeasurementofthe bymeans ofa in 圖圖4:彎曲角 的取Figure Orientationofthebending

stressedconditionandcomprisesinadditiontotheplasticportionofthebendingalsotheelasticportion.Whenmeasuringthesamplesintheunstressedconditionmerelytheplasticportionofthebendingprocessismeasured. 引用標(biāo) Normative 2602：對測試結(jié)果的統(tǒng)計(jì)解釋—均值—置信區(qū) 1240：測試和文獻(xiàn)指南對于鋼鐵材料機(jī)械性能的CAE仿真計(jì)算

ISO2602:Statisticalinterpretationoftestresults-estimationofthemean-confidenceintervalSEP1240:TestingandDocumentationGuidelinefortheExperimentalDeterminationofMechanicalPropertiesofSteelSheetsforCAE-Calculations測量方法

AppendixDeterminationofthebendinganglefromthedisplacementofthepunch(punchMeasuringmethod bymeans ofthe in portionalsoaportionofelasticdeformation.2Arc(Ra)h22gh(4g(RPI()2g (

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(R

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Rollerradiusin Samplethickness Punchdisplacementinmm Rollerdistanceinmm附錄測量方法

Appendix manualpost-measurementMeasuringmethodByuseofananglemeasuringgaugethebending canbedeterminedinthestress-freecon- comprisestheplasticportionofthebending4:Figure Manualmeasurementofthebent附錄

AppendixExampleofadatacurvefromthebendingAbbildung Figure Examplecurveforthe

Bending材料:Material:表面:ZESurface::Pre-straining:without測試方向:橫向Testingdirection::Heattreatment:296Testtemperature:296K沖頭半徑:0,2mmPunchradius:0,2mm樣品:aSample:P牛，寬為bmmhmm，跨距為Lmmσ7位ASCII代碼，沒有變音符號，使用制表位。Die 空白字符數(shù)沒有要求注釋行以$字符開頭小數(shù)字符是一個點(diǎn).列用分號分隔數(shù)據(jù)文件名的擴(kuò)展名位 .txt”或“.dat （測試時的簡稱，制造商等） JPEG。文本文檔的格式是Microsoft Word。后處理所需的測試數(shù)據(jù)應(yīng)以MicrosoftExcel WERKSTOFF_NORM_NAME=HC340XWERKSTOFFNUMMER_NORM=1.0941MATERIALNAME=DP600PRUEFUNG=BIEGEVERSUCHPROBENIDENTNUMMER=PROBENGEOMETRIE=Biegepl?ttchen60mmENTNAHMERICHTUNG=QUERVORVERFORMUNG_SOLL<%>=0

Appendix characteristicvalueInorder toguarantee data,standardizeddataformatshavebeenestab-lishedandshouldbefollowed.Theagreedcharac-tersetisasfollows: tabstopsaretobeused Commentlinesbeginwitha$characterDecimalcharacterisapoint “.”Columnsaretobeseparatedbysemicolons to “ ” “.datThesaveddatafileshallincludeaheaderingalloftheimportantinformationregardingthetestprocedure.Theheadershallcontaingeneralinformationregardingthematerial(shortnameatthetimeofthetest,manufacturer,etc.)aswellasspecificinformationresultingfromthetest(e.g.measuredbendingangle).Thekeywordsgivenbelowaretobeusedexactlyastheyarewritten. oftheheader arecategorized essaryfieldsandoptionalfields.Necessaryfieldscontaininformationwhichmustbeprovided