作者:标准资料网 时间:2024-05-17 05:59:02   浏览:9051   来源:标准资料网

【英文标准名称】:StandardTestMethodsforTensileTestingofAramidYarns
【原文标准名称】:芳族聚酰胺纱线抗拉试验的标准试验方法
【标准号】:ASTMD7269/D7269M-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】:D13.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:aramid;lineardensity;tensileproperties/tests;tirecord;tirefabric;Yarns;Aramidfibers;Lineardensity;Tensileproperties/testing;Tirecordsandtirecordfabrics
【摘要】:Thelevelsoftensilepropertiesobtainedwhentestingaramidyarnsandtirecordsaredependentontheageandhistoryofthespecimenandonthespecificconditionsusedduringthetest.Amongtheseconditionsarerateofstretching,typeofclamps,gagelengthofspecimen,temperatureandhumidityoftheatmosphere,rateofairflowacrossthespecimen,andtemperatureandmoisturecontentofthespecimen.Testingconditionsaccordinglyarespecifiedpreciselytoobtainreproducibletestresultsonaspecificsample.Becausetheforce-bearingabilityofareinforcedrubberproductisrelatedtothestrengthoftheyarnorcordusedasareinforcingmaterial,breakingstrengthisusedinengineeringcalculationswhendesigningvarioustypesoftextilereinforcedrubberproducts.Whenneededtocompareintrinsicstrengthcharacteristicsofyarnsorcordsofdifferentsizesordifferenttypesoffiber,breakingtenacityisveryusefulbecause,foragiventypeoffiber,breakingforceisapproximatelyproportionaltolineardensity.Elongationofyarnorcordistakenintoconsiderationinthedesignandengineeringofreinforcedrubberproductsbecauseofitseffectonuniformityofthefinishedproductanditsdimensionalstabilityduringservice.TheFASEisusedtomonitorchangesincharacteristicsofthetextilematerialduringthevariousstagesinvolvedintheprocessingandincorporationofyarnorcordintoarubberproduct.Modulusisameasureoftheresistanceofyarnorcordtoextensionasaforceisapplied.Itisusefulforestimatingtheresponseofatextilereinforcedstructuretotheapplicationofvaryingforcesandratesofstretching.Althoughmodulusmaybedeterminedatanyspecifiedforce,initialmodulusisthevaluemostcommonlyused.Work-to-breakisdependentontherelationshipofforcetoelongation.Itisameasureoftheabilityofatextilestructuretoabsorbmechanicalenergy.Breakingtoughnessiswork-to-breakperunitmass.Itshouldbeemphasizedthat,althoughtheprecedingparametersarerelatedtotheperformanceofatextile-reinforcedproduct,theactualconfigurationoftheproductissignificant.Shape,size,andinternalconstructionalsocanhaveappreciableeffectonproductperformance.Itisnotpossible,therefore,toevaluatetheperformanceofatextilereinforcedproductintermsofthereinforcingmaterialalone.Iftherearedifferencesofpracticalsignificancebetweenreportedtestresultsfortwolaboratories(ormore),comparativetestsshouldbeperformedtodetermineifthereisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,testsamplesshouldbeusedthatareashomogeneousaspossible,thataredrawnfromthematerialfromwhichthedisparatetestresultswereobtained,andthatarerandomlyassignedinequalnumberstoeachlaboratoryfortesting.Othermaterialswithestablishedtestvaluesmaybeusedforthispurpose.Thetestresultsfromthetwolaboratoriesshouldbecomparedusingastatisticaltestforunpaireddata,ataprobabilitylevelchosenpriortothetestingseries.Ifabiasisfound,eitheritscausemustbefoundandcorrected,orfuturetestresultsmustbeadjustedinconsiderationoftheknownbias.1.1Thesetestmethodscoverthetensiletestingofaramidyarns,cordstwistedfromsuchyarns,andfabricswovenfromsuchcords.Theyarnorcordmaybewoundoncones,tubes,bobbins,spools,orbeams;maybewovenintofabric;ormaybeinsomeotherform.Themethodsincludetestingprocedureonlyandincludenospecificationsortolerances.1.2ThevaluesstatedineitherSIunits......
【中国标准分类号】:W50
【国际标准分类号】:59_080_20
【页数】:28P.;A4
【正文语种】:英语