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【英文标准名称】:StandardTestMethodforPlane-Strain(Chevron-Notch)FractureToughnessofMetallicMaterials
【原文标准名称】:金属材料水平变形断裂强度的标准试验方法
【标准号】:ASTME1304-1997(2008)e1
【标准状态】:现行
【国别】:美国
【发布日期】:1997
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E08.02
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Calibration--loadtestingmachines;Chevronnotchedspecimen;Cracking--crackgrowth;Fracturetesting--metals/alloys;Loadingtests--metals/alloys;Metalsandmetallicmaterials;Plane-straintesting;Smoothcrackgrowthdata;Tensileproperties/testing-
【摘要】:Thefracturetoughnessdeterminedbythistestmethodcharacterizestheresistanceofamaterialtofracturebyaslowlyadvancingsteady-statecrack(see3.2.5)inaneutralenvironmentunderseveretensileconstraint.Thestateofstressnearthecrackfrontapproachesplanestrain,andthecrack-tipplasticregionissmallcomparedwiththecracksizeandspecimendimensionsintheconstraintdirection.AKIvorKIvjvaluemaybeusedtoestimatetherelationbetweenfailurestressanddefectsizewhentheconditionsdescribedabovewouldbeexpected,althoughtherelationshipmaydifferfromthatobtainedfromaKIcvalue(seeNote1).BackgroundinformationconcerningthebasisfordevelopmentofthistestmethodintermsoflinearelasticfracturemechanicsmaybefoundinRefs(1-15).TheKIv,KIvj,orKIvMvalueofagivenmaterialcanbeafunctionoftestingspeed(strainrate)andtemperature.Furthermore,cyclicforcescancausecrackextensionatKIvalueslessthanKIv,andcrackextensioncanbeincreasedbythepresenceofanaggressiveenvironment.Therefore,applicationofKIvinthedesignofservicecomponentsshouldbemadewithanawarenessofdifferencesthatmayexistbetweenthelaboratorytestsandfieldconditions.Plane-strainfracturetoughnesstestingisunusualinthattherecanbenoadvanceassurancethatavalidKIv,KIvj,orKIvMwillbedeterminedinaparticulartest.Therefore,itisessentialthatallthecriteriaconcerningthevalidityofresultsbecarefullyconsideredasdescribedherein.Thistestmethodcanservethefollowingpurposes:Toestablishtheeffectsofmetallurgicalvariablessuchascompositionorheattreatment,oroffabricatingoperationssuchasweldingorforming,onthefracturetoughnessofneworexistingmaterials.Forspecificationsofacceptanceandmanufacturingqualitycontrol,butonlywhenthereisasoundbasisforspecificationofminimumKIv,KIvj,orKIvMvalues,andthenonlyifthedimensionsoftheproductaresufficienttoprovidespecimensofthesizerequiredforvalidKIvdetermination(5).ThespecificationofKIvvaluesinrelationtoaparticularapplicationshouldsignifythatafracturecontrolstudyhasbeenconductedonthecomponentinrelationtotheexpectedhistoryofloadingandenvironment,andinrelationtothesensitivityandreliabilityofthecrackdetectionproceduresthataretobeappliedpriortoserviceandsubsequentlyduringtheanticipatedlife.Toprovidehighspatialresolutioninmeasuringplanestrainfracturetoughnessvariationsinparentpiecesofmaterial(14).Note28212;Thehighspatialre.......
【中国标准分类号】:H22
【国际标准分类号】:77_040_10
【页数】:11P.;A4
【正文语种】:英语