【英文标准名称】:StandardPracticeforCommercialRadialTruck-BusTirestoEstablishEquivalentTestSeverityBetweena1.707-m(67.23-in.)DiameterRoadwheelandaFlatSurface
【原文标准名称】:用以在1.707m(67.23英寸)直径负重轮和平面之间建立等效试验严重程度的商用辐射卡车-客车轮胎的标准实施规程
【标准号】:ASTMF2779-2010
【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】:F09.30
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:commercialtire;curvedtoflat;endurance;equivalency;flattocurved;highspeed;highwayequivalent;roadwheel;roadwheeltesting;temperature;testseverity;tire;tiretemperature;truck-bus;67.23-in.;1.707-m
【摘要】:Historically,tireshavebeentestedforendurancebyavarietyoftestmethods.Sometypicaltestingprotocolshavebeen:(1)provinggroundsorhighwaytestingoverarangeofspeeds,loads,andinflations,(2)testingonfleetsofvehiclesforextendedperiodsoftime,and(3)nbsp;nbsp;nbsp;indoor(laboratory)testingoftiresloadedonarotating1.707-mdiameterroadwheel;however,thecurvedsurfaceofa1.707-mdiameterroadwheelresultsinasignificantlydifferenttirebehaviorfromthatobservedonaflatorhighwaysurface.Thispracticeaddressestheneedforprovidingequivalenttestseverityoverarangeoftypicaltireoperatingconditionsbetweena1.707-mdiameterroadwheelsurface(PracticeF551)andaflatsurface.Therearedifferentdeformationsofthetirefootprintoncurvedversusflatsurfacesresultingindifferentfootprintmechanics,stress/straincycles,andsignificantlydifferentinternaloperatingtemperaturesforthetwotypesofcontactsurface.Sincetireinternaltemperaturesarekeyparametersinfluencingtireenduranceoroperatingcharacteristicsundertypicaluseconditions,itisimportanttobeabletocalculateinternaltemperaturedifferentialsbetweencurvedandflatsurfacesforarangeofloads,inflationpressuresandrotationalvelocities(speeds).Datafromlabandroadtiretemperaturemeasurementtrialswerecombined,statisticallyanalyzed,andtiretemperaturepredictionmodelsderived.Thefitofthemodelstothedataisshownasthecoefficientofdetermination,R2,forthetwocriticalcrownareatemperatures,i.e.treadcenterlineandbeltedge,aswellastheplyendingarea:R2=0.89,0.90,and0.89respectivelyThesepredictionmodelswereusedtodevelopthepredictionprofilersdescribedinSection7andAnnexA1.1.1Thispracticedescribestheproceduretoidentifyequivalenttestseverityconditionsbetweena1.707-mdiameterlaboratoryroadwheelsurfaceandaflatorhighwaysurfaceforcommercialradialtruck-bustires.1.1.1Tireoperationalseverity,asdefinedastherunningoroperationaltemperatureforcertainspecifiedinternaltirelocations,isnotthesameforthesetwotestconditions.Itistypicallyhigherforthelaboratoryroadwheelatequalload,speedandinflationpressureconditionsduetothecurvatureeffect.1.1.2ThepracticeappliestospecificoperatingconditionsofloadrangeFthroughLforsuchcommercialradialtruck-bustires.1.1.3ThespecificoperatingconditionsunderwhichtheproceduresofthepracticearevalidandusefularecompletelyoutlinedinSection6(Limitations)ofthisstandard.1.1.4Itisimportanttonotethatthisstandardiscomposedoftwodistinctformats:1.1.4.1TheusualtextformataspublishedinthisvolumeoftheBookofStandards(Vol09.02).1.1.4.2Aspecialinteractiveelectronicformatthatusesaspecialsoftwaretool,designatedaspredictionprofilersorprofilers.Thisspecialprofilermaybeusedtodeterminelaboratorytestconditionsthatprovideequivalenttireinternaltemperaturesforthetreadcenterline,beltedge,orplyendingregionforthetwooperationalconditions,thatis,thecurvedlaboratoryroadwheelandflathighwaytestsurfaces.1.2Thepredictionprofilersarebasedonempiricallydevelopedlinearregressionmodelsobtainedfromtheanalysisofalargedatabasethatwasobtainedfromacomprehensiveexperimentaltestprogramforroadwheelandflatsurfacetestingoftypicalcommercialtruckandbustires.SeeSection7andReferences(1,2)