ASTM D6720-2007 评估弹力丝(绞纱样品)可复原弹性用标准试验方法
时间:2024-05-19 23:43:49 来源: 标准资料网 作者：标准资料网 阅读：8063
【英文标准名称】:StandardTestMethodforEvaluationofRecoverableStretchofStretchYarns(SkeinMethod)
【原文标准名称】:评估弹力丝(绞纱样品)可复原弹性用标准试验方法
【标准号】:ASTMD6720-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:评估;试验方法;纱线
【英文主题词】:crimp;elastomericyarns;recoverablestretch;stretchyarns;texturedyarncrimp;elastomericyarns;recoverablestretch;stretchyarns;texturedyarns
【摘要】:Thistestmethodisconsideredsatisfactoryforacceptancetestingofcommercialshipmentsbecausecurrentestimatesofbetween-laboratoryprecisionareacceptableandthemethodisusedextensivelyinthetradeforacceptancetesting.5.1.1Iftherearedifferencesofpracticalsignificancebetweenreportedtestresultsfortwolaboratories(ormore),comparativetestsshouldbeperformedtodetermineifthereisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,usesamplesforsuchcomparativeteststhatareashomogeneousaspossible,drawnfromthesamelotofmaterialasthesamplesthatresultedindisparateresultsduringinitialtesting,andrandomlyassignedinequalnumberstoeachlaboratory.Thetestresultsfromthelaboratoriesinvolvedshouldbecomparedusingastatisticaltestforunpaireddata,ataprobabilitylevelchosenpriortothetestingseries.Ifbiasisfound,eitheritscausemustbefoundandcorrected,orfuturetestresultsforthatmaterialmustbeadjustedinconsiderationoftheknownbias.Thistestdiffersfromothercrimpcontractiontestmethodsinthatitmeasurestherecoverablestretchduringtheunloadcycleoftheyarn.1.1Thistestmethodcoversthedeterminationoftherecoverablestretchofcommercialtexturedyarns,coveredelastomericyarnsandotherstretchyarnsusingskeins.Thistestmethodisparticularlyvaluableforyarnsthatdevelopadditionalcrimpuponexposuretohot,wetconditions.Therecoverablestretchisarelativemeasureoftherecoverypowertheyarncanbeexpectedtoprovideinafinishedfabric.1.2Thistestmethodisapplicabletocontinuousfilamentyarnsandissuitableforyarnsthatdevelopadditionalstretchpotentialuponexposuretoheat.1.3Thismethodisapplicabletoyarns500denierorfiner.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareprovidedforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:W04
【国际标准分类号】:59_080_20
【页数】:3P.;A4
【正文语种】:
【英文标准名称】:Reliabilitydataanalysistechniques-Proceduresforcomparisonoftwoconstantfailureratesandtwoconstantfailure(event)intensities
【原文标准名称】:可靠性数据分析技术.双恒定失效率和双恒定失效(事件)密度比较程序
【标准号】:BSIEC61650-1997
【标准状态】:现行
【国别】:英国
【发布日期】:1997-10-15
【实施或试行日期】:1997-10-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:质量保证;质量控制;性能试验;性能;统计质量控制;失效;统计检验;可靠度;统计分布;认可试验;统计方法分析
【英文主题词】:Comparison;Dataanalysis;Electricalengineering;Failureanalysis;Failurerates;Mathematicalcalculations;Reliabilityanalysis;Reliabilitymanagement
【摘要】:ThisInternationalStandardspecifiesprocedurestocomparetwoobserved–failurerates;–failureintensities;–rates/intensitiesofrelevantevents.Theproceduresareusedtodeterminewhetheranapparentdifferencebetweenthetwosetsofobservationscanbeconsideredstatisticallysignificant.Itisassumedthatthetimeintervalsto/betweenthefailures(events)areindependentandidenticallyexponentiallydistributedduringtheobservationperiod(thatis,theaccumulatedrelevanttesttime).NOTE–Thisassumptionimpliesthatthefailurerate/intensityisconstant.Itisfurthermoreassumedthattherearetechnicalorotherreasonstobelievethatadifference(eitheranimprovementordeterioration)mightexistbetweentheobservedreliabilitycharacteristicofthetwosetsofitemsundercomparison.Someexamplesoftypicalapplicationsaredescribedin5.4.Themethodsaredesignedashypothesistestswhichstate,withaspecifiedrisk(thesignificancelevel),whetherthetwoseriesofobservationsbelongtothesamepopulationorthesameprocess,thatistheyhavethesametruemeanvalue.NOTE–Failurerate,whichisrelevanttonon-repaireditems,isassociatedwithadistributionoftimestofailure.Failureintensity,whichisrelevanttorepaireditemsonly,isassociatedwithapointprocessdescribingasequenceofevents,forexampletimesbetweenfailuresonatimeaxis.Theproceduresarenotrestrictedtocomparisonoffailurerate/intensity,butcanbeappliedtoobservationsoftwoseriesofanyrelevantevents,providedtheaboveassumptionsarevalid.NOTE–Thetwoseriesofobservationsmaybeofitemsfromthesamepopulation,orthesameitemunderdifferentconditions(forexampleenvironmentandload),orjustcomparableseriesofevents(forexamplecaraccidentsonaroad).Numericalmethodsandagraphicalprocedureareprescribed.Theobservationperiodsrelevanttothetwoseriesdonotneedtobeequal,butiftheyare,themethodsareverysimple.
【中国标准分类号】:K04
【国际标准分类号】:03_120_01
【页数】:24P.;A4
【正文语种】:英语
【英文标准名称】:Aerospaceseries-Bolts,doublehexagonheadwithlockwireholes,relievedshank,longthread,intitaniumalloyTI-P64001,anodized,MoSDOWN2coated-Strengthclass:1100MPa(atambienttemperature)
【原文标准名称】:航空航天系列.阳极氧化处理镀MoS2的TI-P64001型钛合金制安全杆、长螺纹、带安全锁线孔的双六角头螺栓.强度等级:1100MPa(室温)
【标准号】:BSEN4322-2003
【标准状态】:作废
【国别】:英国
【发布日期】:2003-03-04
【实施或试行日期】:2003-03-04
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:覆层;规范(验收);十二角头;螺钉;钛合金;细杆;航空航天运输;合金;十二角螺钉;防护覆层;设计;公差(测量);航空运输;材料;尺寸;航天运输;特性;钛;紧固件
【英文主题词】:
【摘要】:
【中国标准分类号】:V20
【国际标准分类号】:49_030_20
【页数】:12P;A4
【正文语种】:英语