标准资料网-标准资料免费资源平台

【英文标准名称】:StandardTestMethodforGallingResistanceofMaterials
【原文标准名称】:材料抗磨损的标准试验方法
【标准号】:ASTMG98-2002(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【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】:G02.40
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:button-on-blocktest;galling;gallingresistanceranking;macroscopicsurfacedamage;seizedcomponents;slidingmetallicsurfaces;thresholdgallingstress;Button-on-blocktest;Compressiontesting--metallicmaterials;Damageassessment;Destructivet
【摘要】:Thistestmethodisdesignedtorankmaterialcouplesintheirresistancetothefailuremodecausedbygallingandnotmerelytoclassifythesurfaceappearanceofslidingsurfaces.Thistestmethodshouldbeconsideredwhendamaged(galled)surfacesrendercomponentsnon-serviceable.Experiencehasshownthatgallingismostprevalentinslidingsystemsthatareslowmovingandoperateintermittently.Thegallingandseizureofthreadedcomponentsisaclassicexamplewhichthistestmethodmostcloselysimulates.Othergalling-proneexamplesinclude:sealingsurfacesofvaluetrimwhichmayleakexcessivelyduetogalling;andpumpwearringsthatmayfunctionineffectivelyduetogalling.Iftheequipmentcontinuestooperatesatisfactorilyandlosesdimensiongradually,thenmechanicalwearshouldbeevaluatedbyadifferenttestsuchasthecrossedcylinderTestMethod(seeTestMethodG83).Chainbeltpinsandbushingsareexamplesofthistypeofproblem.Thistestmethodshouldnotbeusedforquantitativeorfinaldesignpurposessincemanyenvironmentalfactorsinfluencethegallingperformanceofmaterialsinservice.Lubrication,alignment,stiffnessandgeometryareonlysomeofthefactorsthatcanaffecthowmaterialsperform.Thistestmethodhasprovenvaluableinscreeningmaterialsforprototypicaltestingthatmorecloselysimulatesactualserviceconditions.1.1Thistestmethodcoversalaboratorytestwhichranksthegallingresistanceofmaterialcouples.Mostgallingstudieshavebeenconductedonbaremetalsandalloys;however,non-metallics,coatings,andsurfacemodifiedalloysmayalsobeevaluatedbythistestmethod.1.2Thistestmethodisnotdesignedforevaluatingthegallingresistanceofmaterialcouplesslidingunderlubricatedconditionsbecausegallingusuallywillnotoccurunderlubricatedslidingconditionsusingthistestmethod.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A42
【国际标准分类号】:17_040_20
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:Informationtechnology-UseofX.25packetlayerprotocolinconjunctionwithX.21/X.21bistoprovidetheOSIconnection-modenetworkservice
【原文标准名称】:信息技术.使用X.25包层协议及X.21/X.21二度提供开放式系统互连(OSI)连接方式网络服务
【标准号】:BSISO/IEC10588-1993
【标准状态】:现行
【国别】:英国
【发布日期】:1993-08-15
【实施或试行日期】:1993-08-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:数据链路层;数据处理;开放系统互连;网络层;数据传输控制规程;计算机网络;信息交流;包交换网络;通信规程;数据传输;线路交换网络
【英文主题词】:Datacommunication;Dataprocessing;Informationinterchange;Informationtechnology;Networkinterconnection;Networklayers;Networkservices;Opensystemsinterconnection;OSI;Packetswitchingnetworks;Telecommunications;X.21;X.25
【摘要】:ThisCCITTRecommendation|InternationalStandardisapplicabletotheenvironmentswhereRecommendationX.21orX.21bisisusedandwheretheX.25packetlayerprotocol(PLP),asstandardizedinISO/IEC8208,isoperatedduringtheX.21/X.21bisdataphasetoprovidetheOSIConnection-modeNetworkService(CONS).TheseenvironmentsincludeaCSDNandanISDNTerminalAdaptorcomplyingwithRecommendationX.30whichprovidesanX.21access.TheX.25PLPoperateseitherintheDTE/DTEorDTE/DCEmode.ThisprovisionisachievedbyspecifyingthemappingoftheCONSprimitivesandparameterstoandfromtheelementsoftheprotocolsused(i.e.X.25PLPandX.21).
【中国标准分类号】:L78
【国际标准分类号】:33_080;35_100_01
【页数】:20P;A4
【正文语种】:英语