【英文标准名称】:StandardTestMethodforCreepandTimetoFailureofAdhesivesinStaticShearbyCompressionLoading(Wood-to-Wood)
【原文标准名称】:用压缩负荷静剪切法法测定胶粘剂蠕变和老化时间的标准试验方法(木材对木材)
【标准号】:ASTMD4680-1998(2004)
【标准状态】:现行
【国别】:
【发布日期】:1998
【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】:D14.30
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:蠕变;损伤;剪切强度;木材;试验;缺陷;胶粘剂
【英文主题词】:adhesive;compression;creep;shear;strain;stress
【摘要】:Creepdatathatareobtainedoverarelativelyshortperiodoftimeinthistestmethodcanprovideameasureofanadhesivebondrsquo;abilitytowithstandstaticloadinginshearoverarelativelylongperiodoftime.Creepmeasurementsaremadeoverarangeofexpectedserviceconditions,includinglevelofstress,temperature,relativehumidity,anddurationofload.Creeprate,creepstrain,andcreepmodulusarecalculatedatthevariousserviceconditions.Creepdatacanbeusedto(1)predictperformanceofanadhesiveunderlong-termloading,(2)characterizeanadhesive,(3)compareadhesiveswitheachotherandagainstspecifications,and(4)designstructuralmembersfabricatedwithanadhesive.Time-to-failuredataprovideameasureoftheultimateload-carryingabilityofanadhesivebondasafunctionoftimeatvariouslevelsofstress,temperature,andrelativehumidity.Withpropercaution,time-to-failuredataderivedfromrelativelyshortloadingperiodscanbeextrapolatedtoestimatetheusefulservicelifeofanadhesiveatworkinglevelsofstaticstress.Thispropertymayalsobeusedwithcreepdatatoaccomplishpurposeslistedin4.2.Thistestmethodisaresearchtoolintendedfordevelopmentorevaluationofnewadhesivesandnewproductdesigns.Theresearchermayselectfromsuggestedteststhosethatareappropriate.However,creepandtime-to-failuretestsarenonroutineandcanbetime-consumingandexpensive,sotestsmustbeselectedwithcare.Theapparatusandproceduresmaybesuitableformeasuringcreeppropertiesofadhesivesonsubstratesotherthanwood,suchasmetal,plastic,andglass,butsuchconsiderationsarenotwithinthescopeofthistestmethod.FIG.1CreepTestApparatus1.1Thistestmethodcoversthedeterminationoftime-dependentpropertiesofstructuraladhesivesinwood-to-woodbondswhenspecimensaresubjectedtoshearingstressesatvariouslevelsofstaticload,constanttemperature,andrelativehumidity.Apparatusandproceduresareprovidedfordirectmeasurementoftime-dependentsheardeformation(creep)andtimetofailureofadhesivebondsunderstaticload.Guidelinesforselectingtestconditions,methodsforcalculatingcreeprate,creepstrain,creepmodulus,andextrapolationoftimetofailure,aregivenalongwithmethodsofpresentingthesedata.1.2Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.TheSIunitsaregiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G38
【国际标准分类号】:
【页数】:10P.;A4
【正文语种】:


【英文标准名称】:Localandmetropolitanareanetworks-Port-basednetworkaccesscontrol
【原文标准名称】:局域和都市区域网络.网络通路控制
【标准号】:IEEE802.1X-2001
【标准状态】:作废
【国别】:美国
【发布日期】:2001
【实施或试行日期】:
【发布单位】:美国电气电子工程师学会(IEEE)
【起草单位】:IEEE
【标准类型】:()
【标准水平】:()
【中文主题词】:城域网;通信;多路存取计算机;电信;通路;局部地区网络;数据电路;人类;局域网;数据处理;电信;媒体访问控制;城域;通信网;信息技术;远程通信;定义;定义
【英文主题词】:
【摘要】:
【中国标准分类号】:M11
【国际标准分类号】:35_110
【页数】:134P;A4
【正文语种】:英语