【英文标准名称】:StandardTestMethodforTensileStress-StrainofCarbonandGraphite
【原文标准名称】:碳和石墨抗拉应力的标准试验方法
【标准号】:ASTMC749-2008(2010)e1
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D02.F0
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:carbon;graphite;modulusofelasticity;tensilestraintofailure;tensilestrength;Carbon;Graphite
【摘要】:Theroundrobintestingonwhichtheprecisionandbiasforthistestmethodhavebeendeterminedemployedarangeofgraphites(seeTable2)whosegrainsizeswereoftheorderof1miltox00BC;in.(0.0254to6.4mm)andlarger.Thiswiderangeofcarbonsandgraphitescanbetestedwithuniformgaugediameterswithminimumparasiticstressestoprovidequalitydataforuseinengineeringapplicationsratherthansimplyforqualitycontrol.Thistestmethodcanbeeasilyadaptedtoelevatedtemperaturetestingofcarbonsandgraphiteswithoutchangingthespecimensizeorconfigurationbysimplyutilizingelevatedtemperaturematerialsfortheloadtrain.Thistestmethodhasbeenutilizedfortemperaturesashighas4352x00B0;F(2400x00B0;C).Thedesignofthefixtures(Figs.2-9andTable1)anddescriptionoftheproceduresareintendedtobringabout,ontheaverage,parasiticstressesoflessthan5%.Thespecimensforthedifferentgraphiteshavebeendesignedtoensurefracturewithinthegaugesectioncommensuratewithexperiencedvariabilityinmachiningandtestingcareatdifferentfacilities.Theconstantgaugediameterpermitsrigorousanalyticaltreatment.5.2Carbonandgraphitematerialsexhibitsignificantphysicalpropertydifferenceswithinparentmaterials.Exactsamplingpatternsandgrainorientationsmustbespecifiedinordertomakemeaningfultensilestrengthcomparisons.SeealsoTestMethodsC565.1.1Thistestmethodcoversthetestingofcarbonandgraphiteintensiontoobtainthetensilestress-strainbehavior,tofailure,fromwhichtheultimatestrength,thestraintofailure,andtheelasticmodulimaybecalculatedasmayberequiredforengineeringapplications.Table2listssuggestedsizesofspecimensthatcanbeusedinthetests.Note18212;Theresultsofabout400tests,onfileatASTMasaresearchreport,showtherangesofmaterialsthathavebeentested,therangesofspecimenconfigurations,andtheagreementbetweenthetesters.SeeSection11.Note28212;Forsafetyconsiderations,itisrecommendedthatthechainsbesurroundedbysuitablememberssothatatfailureallpartsoftheloadtrainbehavepredictablyanddonotconstituteahazardfortheoperator.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.Conversionsarenotprovidedinthetablesandfigures.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q51
【国际标准分类号】:71_060_10
【页数】:11P.;A4
【正文语种】:英语