基本信息
| 标准名称： | ５０００倍气动量仪用内径测量头（Ｄ＞６５~８０） |
| 中标分类： |
航空、航天 >>
航空器与航天器制造用设备 >>
量具 |
| 发布日期： | 1994-06-01 |
| 实施日期： | 1994-06-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 2页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 航空 航天 航空器与航天器制造用设备 量具
【英文标准名称】:StandardTestMethodforYoung''sModulus,TangentModulus,andChordModulus
【原文标准名称】:杨氏弹性模量、正切模量和弦切模量的标准试验方法
【标准号】:ASTME111-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【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】:金属;机械试验;带条;试验;正切模量;弹性模量
【英文主题词】:chordmodulus;stress-straindiagram;tangentmodulus;Young'smodulus
【摘要】:ThevalueofYoungrsquo;modulusisamaterialpropertyusefulindesignforcalculatingcomplianceofstructuralmaterialsthatfollowHookersquo;lawwhensubjectedtouniaxialloading(thatis,thestrainisproportionaltotheappliedforce).Formaterialsthatfollownonlinearelasticstress-strainbehavior,thevalueoftangentorchordmodulusisusefulinestimatingthechangeinstrainforaspecifiedrangeinstress.Sinceformanymaterials,Youngrsquo;modulusintensionisdifferentfromYoungrsquo;modulusincompression,itshallbederivedfromtestdataobtainedinthestressmodeofinterest.Theaccuracyandprecisionofapparatus,testspecimens,andproceduralstepsshouldbesuchastoconformtothematerialbeingtestedandtoareferencestandard,ifavailable.PrecisedeterminationofYoungrsquo;modulusrequiresdueregardforthenumerousvariablesthatmayaffectsuchdeterminations.Theseinclude(1)characteristicsofthespecimensuchasorientationofgrainsrelativetothedirectionofthestress,grainsize,residualstress,previousstrainhistory,dimensions,andeccentricity;(2)testingconditions,suchasalignmentofthespecimen,speedoftesting,temperature,temperaturevariations,conditionoftestequipment,ratiooferrorinappliedforcetotherangeinforcevalues,andratiooferrorinextensionmeasurementtotherangeinextensionvaluesusedinthedetermination;and(3)interpretationofdata(seeSection9).Whenthemodulusdeterminationismadeatstrainsinexcessof0.25%,correctionshouldbemadeforchangesincross-sectionalareaandgagelength,bysubstitutingtheinstantaneouscrosssectionandinstantaneousgagelengthfortheoriginalvalues.Compressionresultsmaybeaffectedbybarreling(seeTestMethodsE9).Strainmeasurementsshouldthereforebemadeinthespecimenregionwheresucheffectsareminimal.FIG.2Load-DeviationGraph1.1ThistestmethodcoversthedeterminationofYoung''smodulus,tangentmodulus,andchordmodulusofstructuralmaterials.Thistestmethodislimitedtomaterialsinwhichandtotemperaturesandstressesatwhichcreepisnegligiblecomparedtothestrainproducedimmediatelyuponloadingandtoelasticbehavior.1.2Becauseofexperimentalproblemsassociatedwiththeestablishmentoftheoriginofthestress-straincurvedescribedin8.1,thedeterminationoftheinitialtangentmodulus(thatis,theslopeofthestress-straincurveattheorigin)andthesecantmodulusareoutsidethescopeofthistestmethod.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatoryrequirementspriortouse.
【中国标准分类号】:A52
【国际标准分类号】:19_060
【页数】:7P.;A4
【正文语种】: