QB/T 3851.3-1999 夹扭钳 圆嘴钳
时间:2024-05-09 08:56:45 来源: 标准资料网 作者：标准资料网 阅读：8964
基本信息
| 标准名称： | 夹扭钳 圆嘴钳 |
| 中标分类： |
机械 >>
工艺装备 >>
手工工具 |
| 替代情况： | 原标准号GB 6293.3-86;被QB/T 2440.3-99代替 |
| 发布日期： | |
| 实施日期： | 1999-04-21 |
| 首发日期： | |
| 作废日期： | 1999-12-01 |
| 出版日期： | |
| 页数： | 3页 |
适用范围
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前言
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引用标准
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所属分类： 机械 工艺装备 手工工具
【英文标准名称】:StandardTestMethodforTotalMassLossandCollectedVolatileCondensableMaterialsfromOutgassinginaVacuumEnvironment
【原文标准名称】:真空环境中放气引起的总质量损失及收集的挥发性可凝结物的测定用标准试验方法
【标准号】:ASTME595-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:E21.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:航空航天运输;材料;航天技术;测试;真空的;挥发性的
【英文主题词】:CollectedVolatileCondensableMaterial(CVCM);materialselection;materialtest;Outgassing;screeningtest;spacecraftmaterials;TotalMassLoss(TML);VolatileCondensableMaterials(VCM)
【摘要】:Thistestmethodevaluates,undercarefullycontrolledconditions,thechangesinthemassofatestspecimenonexposureundervacuumtoatemperatureof125x00B0;Candthemassofthoseproductsthatleavethespecimenandcondenseonacollectoratatemperatureof25x00B0;C.The24htesttimedoesnotrepresentactualoutgassingfromyearsofoperation,soahighertesttemperatureshortertimewasselectedtoallowmaterialcomparisonswithnointenttopredictactualoutgassinginservice.Thetesttemperatureof125x00B0;Cwasassumedtobesignificantlyabovetheexpectedoperatingtemperatureinservice.Ifexpectedoperatingtemperaturesexceed65to70x00B0;Cthetesttemperatureshouldbeincreased.Itissuggestedthattesttemperaturebeatleast30x00B0;ChigherthanexpectedmaximumservicetemperatureinordertoprovidematerialcomparisonsforTMLandCVCM.Comparisonsofmaterialoutgassingpropertiesarevalidat125x00B0;Csampletemperatureand25x00B0;Ccollectortemperatureonly.Samplestestedatothertemperaturesmaybecomparedonlywithothermaterialswhichweretestedatthatsametemperature.Themeasurementsofthecollectedvolatilecondensablematerialarealsocomparableandvalidonlyforsimilarcollectorgeometryandsurfacesat25x00B0;C.Sampleshavebeentestedatsampletemperaturesfrom50to400x00B0;Candatcollectortemperaturesfrom1to30x00B0;Cbythistesttechnique.Datatakenatnonstandardconditionsmustbeclearlyidentifiedandshouldnotbecomparedwithsamplestestedat125x00B0;Csampletemperatureand25x00B0;Ccollectortemperature.Thesimulationofthevacuumofspaceinthistestmethoddoesnotrequirethatthepressurebeaslowasthatencounteredininterplanetaryflight(forexample,10x2212;12Pa(10x2212;14torr)).Itissufficientthatthepressurebelowenoughthatthemeanfreepathofgasmoleculesbelongincomparisontochamberdimensions.Thismethodofscreeningmaterialsisconsideredaconservativeonebecausemaximumoperatingtemperaturesinserviceareassumednottoexceed50to60x00B0;Cformostapplications.Itispossiblethatafewmaterialswillhaveacceptablepropertiesattheintendedusetemperaturebutwillbeeliminatedbecausetheirpropertiesarenotsatisfactoryatthetesttemperatureof125x00B0;C.Also,materialsthatcondenseonlybelow25x00B0;Carenotdetected.Theusermaydesignateadditionalteststoqualifymaterialsforaspecificapplication.ThedeterminationsofTMLandWVRareaffectedbythecapacityofthematerialtogainorlosewatervapor.Therefore,theweighingsmustbeaccomplishedundercontrolledconditionsof23x00B0;Cand50%relativehumidity.Alternatively,allspecimensmaybeputintoopenglassvialsduringthe24-htemperatureandhumidityconditioning.Thevialsmustbecappedbeforeremovalfromtheconditioningchamber.Eachspecimenmustbeweighedwithin2minafteropeningthevialtominimizethelossorabsorptionofwatervaporwhileexposedtoanuncontrolledhumidityenvironment.Whilecontrolofhumidityisnotnecessaryatthispoint,thetemperaturefortheweighingshouldbecontrolledat23x00B0;C,thesametemperatureprescribedfort......
【中国标准分类号】:V10
【国际标准分类号】:
【页数】:9P.;A4
【正文语种】:
【英文标准名称】:NationalAnnex-Nationallydeterminedparameters-Eurocode3:Designofsteelstructures-Part3-2:Towers,mastsandchimneys-Chimneys
【原文标准名称】:国家附录.国家制定参数.欧洲规范3:钢结构设计.第3-2部分:塔,柱和烟囱.烟囱
【标准号】:DINEN1993-3-2/NA-2010
【标准状态】:现行
【国别】:德国
【发布日期】:2010-12
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Buildings;Chimneys;Construction;Controlling;Design;Dimensioning;Eurocode;Exitgaschimneys;Fluegasoutlets;Loadcapacity;Masts;Mathematicalcalculations;Mechanicalproperties;National;Safetyrequirements;Statics;Status;Steelconstruction;Structuralengineeringdrawings;Structuralsteelwork;Structuralsteels;Structures;Towers;Trusses
【摘要】:
【中国标准分类号】:P26
【国际标准分类号】:
【页数】:10P;A4
【正文语种】:德语