【英文标准名称】:StandardPracticeforMakingandUsingPrecrackedDoubleBeamStressCorrosionSpecimens
【原文标准名称】:裂缝前双束应力腐蚀样品的制作和使用标准实施规范
【标准号】:ASTMG168-2000(2006)
【标准状态】:现行
【国别】:
【发布日期】:2000
【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】:G01.06
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:crackgrowthrate;doublecantileverbeamspecimen;KISCC;plateauvelocity;precrackeddoublebeamspecimen;precrackedspecimens;stresscorrosioncracking;thresholdstressintensity
【摘要】:Precrackedspecimensoffertheopportunitytousetheprinciplesoflinearelasticfracturemechanics(1)3toevaluateresistancetostresscorrosioncrackinginthepresenceofapre-existingcrack.Thistypeofevaluationisnotincludedinconventionalbentbeam,C-ring,U-bend,andtensionspecimens.Theprecrackeddoublebeamspecimenisparticularlyusefulforevaluationofmaterialsthatdisplayastrongdependenceongrainorientation.Sincethespecimendimensioninthedirectionofappliedstressissmallfortheprecrackeddoublebeamspecimen,itcanbesuccessfullyusedtoevaluateshorttransversestresscorrosioncrackingofwroughtproducts,suchasrolledplateorextrusions.Theresearchapplicationsandanalysisofprecrackedspecimensingeneral,andtheprecrackeddoublebeamspecimeninparticular,arediscussedinAppendixX1.Theprecrackeddoublebeamspecimenmaybestressedineitherconstantdisplacementorconstantload.Constantdisplacementspecimensstressedbyloadingboltsorwedgesarecompactandself-contained.Bycomparison,constantloadspecimensstressedwithsprings(forexample,proofrings,discussedinTestMethodG49,7.2.1.2)orbydeadweightloadingrequireadditionalfixturesthatremainwiththespecimenduringexposure.Therecommendationsofthispracticearebasedontheresultsofinterlaboratoryprogramstoevaluateprecrackedspecimentestprocedures(2,3)aswellasconsiderableindustrialexperiencewiththeprecrackeddoublebeamspecimenandotherprecrackedspecimengeometries(4-8).1.1Thispracticecoversproceduresforfabricating,preparing,andusingprecrackeddoublebeamstresscorrosiontestspecimens.Thisspecimenconfigurationwasformerlydesignatedthedoublecantileverbeam(DCB)specimen.Guidelinesaregivenformethodsofexposureandinspection.1.2Theprecrackeddoublebeamspecimen,asdescribedinthispractice,isapplicableforevaluationofawidevarietyofmetalsexposedtocorrosiveenvironments.Itisparticularlysuitedtoevaluationofproductshavingahighlydirectionalgrainstructure,suchasrolledplate,forgings,andextrusions,whenstressedintheshorttransversedirection.1.3Theprecrackeddoublebeamspecimenmaybestressedinconstantdisplacementbyboltorwedgeloadingorinconstantloadbyuseofproofringsordeadweightloading.Theprecrackeddoublebeamspecimenisamenabletoexposuretoaqueousorotherliquidsolutionsbyspecimenimmersionorbyperiodicdropwiseadditionofsolutiontothecracktip,orexposuretotheatmosphere.1.4Thispracticeisconcernedonlywithprecrackeddoublebeamspecimenandnotwiththedetailedenvironmentalaspectsofstresscorrosiontesting,whicharecoveredinPracticesG35,G36,G37,G41,G44,andG50.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H25
【国际标准分类号】:77_060
【页数】:10P.;A4
【正文语种】: