JIS B2706-1995 碟形弹簧

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【英文标准名称】:StandardTestMethodforEntanglementsinUntwistedFilamentYarnsbyNeedleInsertion
【原文标准名称】:针入法测定反捻长丝纱的缠结度的标准试验方法
【标准号】:ASTMD4724-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:entanglement;yarn;Acceptancecriteria/testing--textilefabrics/fibers;Averagecentimeterpull;Entanglement;Fiberlength;Filamentyarn;Forwardingtime;Instrumentalmeasurement--textiles;Integritytesting;Man-madetextilefibers;Manualmethod;M
【摘要】:Option1ofthistestmethodforthedeterminationofthedegreeofuntwistedfilamentyarnentanglement,asmeasuredinstrumentally,isusedforacceptancetestingofcommercialshipments;however,cautionisadvisedbecauseinformationonbetween-laboratoryprecisionislacking.Comparativetests,asdirectedin5.1.1,maybeadvisable.Iftherearedifferencesofpracticalsignificancebetweenthereportedtestresultsfortwoormorelaboratories,comparativetestsshouldbeperformedbythoselaboratoriestodetermineifthereisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,samplesusedforeachcomparativetestshouldbeashomogeneousaspossible,drawnfromthesamelotofmaterialasthesamplesthatresultsindisparateresultsduringinitialtesting,andrandomlyassignedinequalnumberstoeachlaboratory.Otherfabricswithestablishedtestvaluesmaybeusedforthispurpose.Thetestresultsfromthelaboratoriesinvolvedshouldbecomparedappropriatestatisticalanalysisandaprobabilitylevelchosenbythetwopartiesbeforetestingbegins,ataprobabilitylevelchosenpriortothetestingseries.Ifabiasisfound,eitheritscausemustbefoundandcorrectedorfuturetestresultsmustbeadjustedinconsiderationoftheknownbias.Option2forthistestmethodisintendedforusewhenthesupplyofyarnislimited.Theinstrumentaloptionofthistestmethodisbasedonthetotalrandomizationoftheentanglementsintheyarn;therefore,thedistancemeasuredbetweenthepointofinsertionofapininthemiddleoftheyarnandthepointatwhichanentanglementisencountered,bymovementoftheyarnorthepinuntilitisstoppedatapresetlevelofforce,isrepresentativeofthedistancebetweentwoentanglementsatsomelocationintheyarn.Entanglementsareusedfrequentlyinsteadoftwisttoensuretheintegrityoffilamentyarns.Suchentanglementsgenerallygivesomewhatlessprotectionduringweavingorknittingthantwist,butwithpropercare,willperformquitesatisfactorily.1.1Thistestmethodcoverstwooptionsforthemeasurementofentanglementsinuntwistedfilamentyarnsusingneedleinsertionoptionsforinstrument(A)andmanual(B)techniques.1.2ThevaluesstatedineitherSIorinch-poundunits(inparentheses)aretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheotherwithoutcombiningvaluesinanyway.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:W58
【国际标准分类号】:59_080_20
【页数】:6P.;A4
【正文语种】:英语


Product Code:SAE J817/2
Title:Engineering Design Serviceability Guidelines--Construction and Industrial Machinery--Maintainability Index--Off-Road Work Machines (Cancelled Dec 2009)
Issuing Committee:Machine Technical Steering Committee
Scope:This SAE Information Report establishes a point system that encourages ease of maintenance actions on off-road work machines. The point system minimizes subjectivity in evaluating maintainability as defined in SAE J817/1.