【英文标准名称】:StandardTestMethodforYarnCrimpandYarnTake-upinWovenFabrics
【原文标准名称】:机织织物中纱线卷曲性或卷绕性的标准试验方法
【标准号】:ASTMD3883-2004(2008)
【标准状态】:现行
【国别】:美国
【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】:D13.59
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:wovenfabric;yarncrimp;yarntake-up,Crimp(take-up);Fiberlength;Woventextilefabrics;Yarncrimp/take-up;Yarnproperties
【摘要】:Therelationshipofthelengthofapieceoffabricandthelengthofyarninthefabriccanbedeterminedaccuratelyonlybemeasuringthelengthofyarnenteringtheloomandthelengthoffabricmadefromthatparticularlengthofyarn.Inmostcases,however,thedeterminationmustofnecessitybemadeonawovenfabricbymeasuringthelengthofyarnremovedfromameasuredlengthoffabric,thusintroducingcertainvariationsthatwillinfluencetheaccuracyofthetest.Yarnremovedfromthewovenfabriccontainsundulationsorwavesthathavebeenintroducedbytheweavingprocess.Heat,moisture,andmechanicalshrinkageonsubsequentfinishingoperationsmayaccentuatetheseundulations,andinallprobability,increasetheforcetopullthemoutandstraightentheyarn.Inordertoaccuratelymeasurethelengthoftheyarnaftertheremovalofthecrimp,theseundulationsmustbepulledoutwithoutelongatingtheyarn.Insomecases,theminimumforcenecessarytostraightentheyarnwillcauseacertainamountoftheelongationtotakeplace,thusincreasingthelengthoftheyarn.Also,stressesimposedupontheyarnduringtheweavingprocessmayhavebeensufficienttostretchtheyarnbeyonditselasticlimit,againincreasingitslength.Itisrecognizedthatdeterminationmadebymeasuringlengthofyarnremovedfromameasuredlengthoffabricmaytendtogivecrimpvaluesthataresomewhathigherthanthecrimpintheyarnasitlayinthefabric.Inthecaseoffabricsmadefromyarnsthatexhibitdifferentialshrinkage,oryarnsofwidelydifferentcount,oryarnswovenatdifferenttensions,thecrimpofeachtypeofyarninthefabricmustbedeterminedandreportedseparately.Thistestmethodcanbeusedforacceptancetestingofcommercialshipmentsbutcomparisonsshouldbemadewithcautionbecauseinformationonestimatesofbetween-laboratoryprecisionislimitedasnotedin13.1.Iftherearedifferencesofpracticalsignificancebetweenreportedtestresultsfortwolaboratories(ormore),comparativetestsshouldbeperformedtodetermineiftheirisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,ensurethetestsamplestobeusedareashomogeneousaspossible,aredrawnfromthematerialfromwhichthedisparatetestresultswereobtained,andarerandomlyassignedinequalnumberstoeachlaboratoryfortesting.Thetestresultsfromthetwolaboratoriesshouldbecomparedusingastatisticaltestforunpaireddata,ataprobabilitylevelchosenpriortothetestingseries.Ifabiasisfound,eitheritscausemustbefoundandcorrected,orfuturetestresultsforthatmaterialmustbeadjustedinconsiderationoftheknownbias.1.1Thistestmethodcoversthedeterminationoftherelationshipbetweenthelengthofapieceoffabricandthelengthoftheyarninthefabricbymeasurementoftheyarncrimpandyarntake-up.1.2Thistestmethodappliestowovenfabrics.1.3ThevaluesstatedineitherSIorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetext,theinch-poundunitsareshowninparentheses.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecification.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:W55
【国际标准分类号】:59_080_30
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:StandardPracticeforCalibrationofBraking/TractiveMeasuringDevicesforTestingTires
【原文标准名称】:试验轮胎用刹车/牵引力测量设备校准的标准实施规程
【标准号】:ASTMF377-2003(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【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】:F09.10
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:brakingtraction;calibration;drivingtraction;forcetransducer;loadcells;tractionmeasuringdevices;Calibration--rubberanalysisinstrumentation;Drivingtraction;Forcetransducer;Loadcells;Tiretesting;Tractiontesting;Brakingforce/torque(
【摘要】:Calibrationisessentialintheuseofvarioustestplatformsanddevicestoinsurethatthetestresultsgeneratedbythesetestdevicesareaccurate,repeatableandmeaningful.ThisstandardgivesthenecessaryinstructionsforthecalibrationofallofthetestdevicescitedintheScope.1.1Thispracticegivesproceduresforthecalibrationof:referenceloadcellscalibrationplatformsystemsbyusingareferenceloadcellstaticcalibrationofbraking/tractiveforceonlockedwheelsoftiretesttrailers,instrumentedvehicles,andlaboratorytiretestingmachinesbyusingthecalibrationplatformsystemasacalibrationfixture.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesinparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G41
【国际标准分类号】:
【页数】:5P.;A4
【正文语种】:英语