【英文标准名称】:StandardTestMethodforDeterminingaThresholdStressIntensityFactorforEnvironment-AssistedCrackingofMetallicMaterials
【原文标准名称】:测定金属材料环境致裂的界限应力强度因子的标准试验方法
【标准号】:ASTME1681-2003(2008)e1
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【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】:E08.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:aqueousagressiveenvironment;constant-forcetest;elasticstress;environment-assistedcracking;metallicmaterials;thresholdstressintensityfactor;Constantforce/displacementtesting;Cracking--metallicmaterials;EAC(environmentallyassistedcrac
【摘要】:TheparametersKEACorKIEACdeterminedbythistestmethodcharacterizetheresistancetocrackgrowthofamaterialwithasharpcrackinspecificenvironmentsunderloadingconditionsinwhichthecrack-tipplasticregionissmallcomparedwiththecrackdepthandtheuncrackedligament.ThelessrestrictivethicknessrequirementsofKEACareintendedforthoseconditionsinwhichtheresultsareastrongfunctionofthethicknessofthespecimenandtheapplicationrequiresthetestingofspecimenswiththicknessrepresentativeoftheapplication.Sincethechemicalandmechanicalinfluencescannotbeseparated,insomematerial/environmentcombinations,thethicknessmustbetreatedasavariable.AKEACorKIEACvalueisbelievedtorepresentacharacteristicmeasurementofenvironment-assistedcrackingresistanceinaprecrackedspecimenexposedtoanenvironmentundersustainedtensileloading.AKEACorKIEACvaluemaybeusedtoestimatetherelationshipbetweenfailurestressanddefectsizeforamaterialunderanyservicecondition,wherethecombinationofcrack-likedefects,sustainedtensileloadingandthesamespecificenvironmentwouldbeexpectedtooccur.(BackgroundinformationconcerningthedevelopmentofthistestmethodcanbefoundinRefs(3-18).1.1Thistestmethodcoversthedeterminationoftheenvironment-assistedcrackingthresholdstressintensityfactorparameters,KIEACandKEAC,formetallicmaterialsfromconstant-forcetestingoffatigueprecrackedbeamorcompactfracturespecimensandfromconstant-displacementtestingoffatigueprecrackedbolt-loadcompactfracturespecimens.1.2Thistestmethodisapplicabletoenvironment-assistedcrackinginaqueousorotheraggressiveenvironments.1.3Materialsthatcanbetestedbythistestmethodarenotlimitedbythicknessorbystrengthaslongasspecimensareofsufficientthicknessandplanarsizetomeetthesizerequirementsofthistestmethod.1.4Arangeofspecimensizeswithproportionalplanardimensionsisprovided,butsizemaybevariableandadjustedforyieldstrengthandappliedforce.Specimenthicknessisavariableindependentofplanarsize.1.5Specimenconfigurationsotherthanthosecontainedinthistestmethodmaybeused,providedthatwell-establishedstressintensitycalibrationsareavailableandthatspecimendimensionsareofsufficientsizetomeetthesizerequirementsofthistestmethodduringtesting.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H22
【国际标准分类号】:91_080_10
【页数】:13P.;A4
【正文语种】:英语