ASTM E143-2002(2008) 室温下剪切模量的标准试验方法

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【英文标准名称】:StandardTestMethodforShearModulusatRoomTemperature
【原文标准名称】:室温下剪切模量的标准试验方法
【标准号】:ASTME143-2002(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【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】:E28.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:shearmodulus;stress-straindiagram;torque-twistdiagram;Angleoftwist;Copperalloypipe;Coppertube;Ferrousmetals/alloys;Nonferrousmetals/alloys;Shearmodulus;Steel;Steelpipe;Straintesting--metallicmaterials;Stress--metallicmaterials;
【摘要】:ShearmodulusisamaterialpropertyusefulincalculatingcomplianceofstructuralmaterialsintorsionprovidedtheyfollowHooke''slaw,thatis,theangleoftwistisproportionaltotheappliedtorque.Examplesoftheuseofshearmodulusareinthedesignofrotatingshaftsandhelicalcompressionsprings.Note38212;Formaterialsthatfollownonlinearelasticstress-strainbehavior,thevalueoftangentorchordshearmodulusisusefulforestimatingthechangeintorsionalstraintocorrespondingstressforaspecifiedstressorstress-range,respectively.Suchdeterminationsare,however,outsidethescopeofthisstandard.(SeeforexampleRef(1).)Theproceduralstepsandprecisionoftheapparatusandthetestspecimensshouldbeappropriatetotheshapeandthematerialtype,sincethemethodappliestoawidevarietyofmaterialsandsizes.Precisedeterminationofshearmodulusdependsonthenumerousvariablesthatmayaffectsuchdeterminations.Thesefactorsincludecharacteristicsofthespecimensuchasresidualstress,concentricity,wallthicknessinthecaseoftubes,deviationfromnominalvalue,previousstrainhistoryandspecimendimension.Testingconditionsthatinfluencetheresultsinclude:axialpositionofthespecimen,temperatureandtemperaturevariations,andmaintenanceoftheapparatus.Interpretationofdataalsoinfluencesresults.1.1Thistestmethodcoversthedeterminationofshearmodulusofstructuralmaterials.Thistestmethodislimitedtomaterialsinwhich,andtostressesatwhich,creepisnegligiblecomparedtothestrainproducedimmediatelyuponloading.Elasticpropertiessuchasshearmodulus,Young''smodulus,andPoisson''sratioarenotdeterminedroutinelyandaregenerallynotspecifiedinmaterialsspecifications.Precisionandbiasstatementsforthesetestmethodsarethereforenotavailable.1.2Units8212;Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H22
【国际标准分类号】:77_040_10
【页数】:5P.;A4
【正文语种】:英语