【英文标准名称】:StandardPracticeforMakingandUsingU-BendStress-CorrosionTestSpecimens
【原文标准名称】:制作和使用U形弯曲应力腐蚀试样
【标准号】:ASTMG30-1997(2003)
【标准状态】:现行
【国别】:
【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】:G01.06
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:腐蚀;金属;生产;试样;磨损;应力腐蚀;使用说明
【英文主题词】:plasticstrain;stress-corrosioncracking;stress-corrosiontestspecimen;U-bends
【摘要】:TheU-bendspecimenmaybeusedforanymetalalloysufficientlyductiletobeformedintotheU-shapewithoutmechanicallycracking.Thespecimenismosteasilymadefromstriporsheetbutcanbemachinedfromplate,bar,castings,orweldments;wirespecimensmaybeusedalso.SincetheU-bendusuallycontainslargeamountsofelasticandplasticstrain,itprovidesoneofthemostseveretestsavailableforsmooth(asopposedtonotchedorprecracked)stress-corrosiontestspecimens.Thestressconditionsarenotusuallyknownandawiderangeofstressesexistinasinglestressedspecimen.Thespecimenisthereforeunsuitableforstudyingtheeffectsofdifferentappliedstressesonstress-corrosioncrackingorforstudyingvariableswhichhaveonlyaminoreffectoncracking.TheadvantageoftheU-bendspecimenisthatitissimpleandeconomicaltomakeanduse.Itismostusefulfordetectinglargedifferencesbetweenthestress-corrosioncrackingresistanceof(a)differentmetalsinthesameenvironment,(b)onemetalindifferentmetallurgicalconditionsinthesameenvironment,or(c)onemetalinseveralenvironments.1.1ThispracticedescribesproceduresformakingandusingU-bendspecimensfortheevaluationofstress-corrosioncrackinginmetals.TheU-bendspecimenisgenerallyarectangularstripwhichisbent180176;aroundapredeterminedradiusandmaintainedinthisconstantstrainconditionduringthestress-corrosiontest.Bendsslightlylessthanorgreaterthan180176;aresometimesused.TypicalU-bendconfigurationsshowingseveraldifferentmethodsofmaintainingtheappliedstressareshowninFig.1.1.2U-bendspecimensusuallycontainbothelasticandplasticstrain.Insomecases(forexample,verythinsheetorsmalldiameterwire)itispossibletoformaU-bendandproduceonlyelasticstrain.However,bent-beam(PracticeG39ordirecttension(PracticeG49))specimensarenormallyusedtostudystress-corrosioncrackingofstriporsheetunderelasticstrainonly.1.3Thispracticeisconcernedonlywiththetestspecimenandnottheenvironmentalaspectsofstress-corrosiontestingwhicharediscussedelsewhere(1),inPracticesG35,G36,G37,G41,G44,G103andTestMethodG123.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Theinch-poundunitsinparenthesesareprovidedforinformation.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.(FormorespecificsafetyhazardinformationseeSection10.)
【中国标准分类号】:H22
【国际标准分类号】:77_060
【页数】:7P.;A4
【正文语种】: