【英文标准名称】:StandardTestMethodforResistancetoEnvironmentalDegradationofElectricalPressureConnectionsInvolvingAluminumandIntendedforResidentialApplications
【原文标准名称】:住宅设备用铝制电压连接件的阻止环境退化的标准试验方法
【标准号】:ASTMB812-1996(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1996
【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】:B02.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:aluminum;aluminumconnections;contacts;environmentaltesting;humiditytesting;mixedenvironmentaltesting;mixedstresstesting;neutralbar;pressureconnection;stresstesting;thermalcycling;twist-onconnector;Degradation--electricalcontactma
【摘要】:Theprincipalunderlyingthetestisthesensitivityoftheelectricalcontactinterfacetotemperatureandhumiditycyclingthatelectricalpressureconnectionsystemsexperienceasaresultofusageandinstallationenvironment.Thetemperaturecyclingmaycausemicromotionatthematingelectricalcontactsurfaceswhichcanexposefreshmetaltothelocalambientatmosphere.Thehumidityexposureisknowntofacilitatecorrosiononfreshlyexposedmetalsurfaces.Thus,forthoseconnectionsystemsthatdonotmaintainstablemetal-to-metalcontactsurfacesundertheconditionofthermalcyclingandhumidityexposure,repeatedsequencesoftheseexposuresleadtodegradationofthecontactingsurfaceindicatedbypotentialdropincrease.Thetestisofshortdurationrelativetotheexpectedlifeofconnectionsinresidentialusage.Stabilityofconnectionresistanceimpliesresistancetodeteriorationduetoenvironmentalconditionsencounteredinresidentialservice.Increasingconnectionresistanceasaresultofthetestexposureindicatesdeteriorationofelectricalcontactinterfaces.Assuranceoflongtermreliabilityandsafetyofconnectiontypesthatdeterioraterequiresfurtherevaluationforspecificspecifiedenvironmentsandapplications.Use8212;Itisrecommendedthatthistestmethodbeusedinoneoftwoways.First,itmaybeusedtoevaluateandreporttheperformanceofaparticularconnectionsystem.Forsuchuse,itisappropriatetoreporttheresultsinasummary(ortabular)formatsuchasshowninSection18,togetherwiththestatementx201C;Theresultsshowninthesummary(ortable)wereobtainedfor(insertdescriptionofconnection)whentestedinaccordancewithTestMethodB812.Second,itmaybeusedasthebasisforspecificationofacceptabilityofproduct.Forthisuse,theminimumtesttimeandthemaximumallowableincreaseinpotentialdropmustbeestablishedbythespecifier.Specificationofconnectionsystemsinaccordancewiththisuseofthestandardtestmethodwouldbeoftheform:x201C;Themaximumpotentialdropincreaseforanyconnection,whentestedinaccordancewithTestMethodB812foraperiodofweeks,shallbemVrelativetothereferenceconnections.x201D;Connectionsystemsthataremostresistanttothermal-cycle/humiditydeterioration,withinthelimitationsofdeterminationbythistestmethod,shownoincreaseinpotentialdrop,relativetothereferenceconnections,whentestedforindefinitetime.Connectionsthatarelessresistanttothermal-cycle/humidityconditionsappliedbythistestwilldemonstrateprogressiveincreasesinpotentialdropwithincreasingtimeontest.Thus,thefollowingexamplesofspecificationsareintheorderofmoststringent(No.1)toleaststringent(No.3).
Duration,weeks
MaximumPotentialDropIncrease,mV
1.
52
0
2.
16
0.2
3.
4
1.0