基本信息
| 标准名称： | 建材机械用铸钢件交货技术条件 |
| 中标分类： |
机械 >>
加工工艺 >>
铸造 |
| ICS分类： |
|
| 发布日期： | 1900-01-01 |
| 实施日期： | 1900-01-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 3页 |
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所属分类： 机械 加工工艺 铸造
【英文标准名称】:StandardTestMethodforTensilePropertiesofYarnsbytheSingle-StrandMethod
【原文标准名称】:单线法测定纱线抗拉特性的标准试验方法
【标准号】:ASTMD2256/D2256M-2009
【标准状态】:现行
【国别】:
【发布日期】:2009
【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】:D13.58
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:breakingstrength;elongation;yarns;Acceptancecriteria/testing--textilefabrics/fibers;Breakingstrength/tenacity--textilefabrics/fibers;Elongation--textiles;Force-elongationcurves;Secantmodulus;Single-strandmethod;Tensileproperties/testing--textilematerials/applications;Toughness;Yarnproperties
【摘要】:AcceptanceTesting8212;OptionA1ofTestMethodD2256isconsideredsatisfactoryforacceptancetestingofcommercialshipmentsbecausethetestmethodhasbeenusedextensivelyinthetradeforacceptancetesting.However,thisstatementisnotapplicabletoknotandloopbreakingforcetests,testsonwetspecimens,testsonoven-driedspecimens,ortestsonspecimensexposedtoloworhightemperaturesandshouldbeusedwithcautionforacceptancetestingbecausefactualinformationonbetween-laboratoryprecisionandbiasisnotavailable.Iftherearedifferencesofpracticalsignificancebetweenreportedtestresultsfortwolaboratories(ormore),comparativetestsshouldbeperformedtodetermineifthereisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,usethesamplesforsuchacomparativeteststhatareashomogeneousaspossible,drawnfromthesamelotofmaterialasthesamplesthatresultedindisparateresultsduringinitialtestingandrandomlyassignedinequalnumberstoeachlaboratory.Thetestresultsfromthelaboratoriesinvolvedshouldbecomparedusingastatisticaltestforunpaireddata,aprobabilitylevelchosenpriortothetestingseries.Ifabiasisfound,eitherits1.1Thistestmethodcoversthedeterminationoftensilepropertiesofmonofilament,multifilament,andspunyarns,eithersingle,plied,orcabledwiththeexceptionofyarnsthatstretchmorethan5.0%whentensionisincreasedfrom0.05to1.0cN/tex(0.5to1.0gf/tex).1.2Thistestmethodcoversthemeasurementofbreakingforceandelongationofyarnsandincludesdirectionsforthecalculationofbreakingtenacity,initialmodulus,chordmodulus,andbreakingtoughness.1.2.1Optionsareincludedforthetestingofspecimensin:(A)straight,(B)knotted,and(C)loopedform.1.2.2Conditionsoftestareincludedforthetestingofspecimensthatare:(1)conditionedair,(2)wet,notimmersed,(3)wet,immersed,(4)oven-dried,(5)exposedtoelevatedtemperature,or(6)exposedtolowtemperature.Note18212;Specialmethodsfortestingyarnsmadefromspecificfibers;namely,glass,flax,hemp,ramie,andkraftpaperandforspecificproducts;namely,tirecordsandrope,havebeenpublished:TestMethodsD885,andSpecificationD578.Note28212;Fordir
【中国标准分类号】:
【国际标准分类号】:59_080_20
【页数】:13P.;A4
【正文语种】: