BS 7655-1.3-1993 电缆绝缘和铠装材料规范.第1部分:绝缘合成橡胶.第3节:XLPE
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来源:标准资料网
【英文标准名称】:Specificationforinsulatingandsheathingmaterialsforcables.Elastomericinsulatingcompounds.XLPE
【原文标准名称】:电缆绝缘和铠装材料规范.第1部分:绝缘合成橡胶.第3节:XLPE
【标准号】:BS7655-1.3-1993
【标准状态】:作废
【国别】:英国
【发布日期】:1993-04-15
【实施或试行日期】:1993-04-15
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:电绝缘;断裂伸长;温度;老化;合成橡胶;交联材料;绝缘电缆;电绝缘材料;弹性体;吸水率;聚乙烯;试验条件;电阻;抗拉强度;电缆;抽样方法;电缆护套;固体绝缘材料;护套电缆;性能
【英文主题词】:
【摘要】:
【中国标准分类号】:K13
【国际标准分类号】:29_035_20
【页数】:6P;A4
【正文语种】:英语
【英文标准名称】:ITLETsupportivetechnologyandspecificationintegration-Part1:Framework
【原文标准名称】:ITLET(信息技术,学习,教育和培训)支持技术和规范整合.第1部分:框架
【标准号】:ISO/IECTR24725-1-2011
【标准状态】:现行
【国别】:国际
【发布日期】:2011-12
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1/SC36
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Architecture(IT);Assistivetechnologies;Computerapplications;Definitions;E-learning;Furthereducation;Informationtechnology;Specification(approval);Training
【摘要】:
【中国标准分类号】:A18
【国际标准分类号】:03_100_30;35_240_99
【页数】:11P;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforDeterminingFormingLimitCurves
【原文标准名称】:测定形成限制曲线的标准试验方法
【标准号】:ASTME2218-2002(2008)
【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】:E28.02
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:circlegrid;forminglimitcurve(FLC);forminglimitdiagram(FLD);limitingdomeheight(LDH);majorstrain;minorstrain;strainanalysis;Biaxialstress;Cold-rolledsteelsheet/strip--specifications;Deepdrawingsteel;Deformation--metals/allo
【摘要】:Aforminglimitcurve(FLC)definesthemaximum(limiting)strainthatagivensampleofametallicsheetcanundergoforarangeofformingconditions,suchasdeepdrawing,stretchingandbendingoveraradiusinapressanddiedrawingoperation,withoutdevelopingalocalizedzoneofthinning(localizednecking)thatwouldindicateincipientfailure.FLCscanbeobtainedempiricallybyusingalaboratoryhemisphericalpunchbiaxialstretchtestandalsoatensiontesttostrainmetalsheetspecimensfromamaterialsamplebeyondtheirelasticlimit,justpriortolocalizedneckingandfracture.Sincethiscannotbepredetermined,oneorbothsurfacesofspecimensarecoveredwithagridpatternofgagelengthsusuallyassquaresorsmalldiametercircles,byasuitablemethodsuchasscribing,photo-grid,orelectro-etching,andtheneachspecimenisformedtothepointoflocalizednecking,orfracture.Strainsinthemajor(e1)andminor(e2)directionsaremeasuredusingpointsonthegridpatternintheareaofthelocalizedneckingorfracture.Blanksofvariedwidthsareusedtoproduceawiderangeofstrainstatesintheminor(e2)direction.Themajor(e1)strainisdeterminedbythecapacityofthematerialtobestretchedinonedirectionassimultaneoussurfaceforceseitherstretch,donotchange,orcompress,themetalinthe(e2)direction.Inthetensiontestdeformationprocess,the(e2)strainsarenegativeandthemetalisnarrowedboththroughthethicknessandacrossitswidth.Thesestrainsareplottedonaforminglimitdiagram(FLD)andtheforminglimitcurve(FLC)isdrawntoconnectthehighestmeasured(e1ande2)straincombinationsthatincludegooddatapoints.Whenthereisintermixingandnocleardistinctionbetweengoodandneckeddatapoints,abestfitcurveisestablishedtofollowthemaximumgooddatapointsastheFLC.Theforminglimitisestablishedatthemaximum(e1)strainattainedpriortonecking.TheFLCdefinesthelimitofusefuldeformationinformingmetallicsheetproducts.FLCsareknowntochangewithmaterial(specificallywiththemechanicalorformabilitypropertiesdevelopedduringtheprocessingoperationsusedinmakingthematerial),andthethicknessofthesheetsample.Thestrainhardeningexponent(nvalue),definedinTestMethodE646,affectstheforminglimit.Ahighnvaluewillraisethelimitingmajorstrain(e1),allowingmorestretchunderpositive(+e2)strainconditions.Theplasticstrainratio(rvalue),definedinTestMethodE517,affectsthecapacityofamaterialtobedeepdrawn.Ahighrvaluewillmovetheminor(x2212;e2)strainintoalesssevereareatotheleftoftheFLDo,thuspermittingdeeperdrawsforagivenmajor(e1)strain.ThethicknessofthematerialwillaffecttheFLCsinceathickerspecimenhasmorevolumetorespondtotheformingprocess.ThepropertiesofthesteelsheetproductusedindeterminingtheFLCofFig.2includedthenvalueandthervalue.FLCsserveasadiagnostictoolformateria.......
【中国标准分类号】:A42
【国际标准分类号】:77_040_20
【页数】:15P.;A4
【正文语种】:英语
