MIL-STD-21A

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MIL-STD-21A, MILITARY STANDARD: WELDED-JOINT DESIGNS, ARMORED-TANK TYPE (26 NOV 1968) [S/S BY MIL-HDBK-21]., This standard covers the design of joints for structures when one or more of the materials being joined is armor.

MIL-STD-21A (NOTICE 1), MILITARY STANDARD: WELDED-JOINT DESIGNS, ARMORED-TANK TYPE (15 APR 1974) [S/S BY MIL-HDBK-21].

MIL-STD-21A (NOTICE 2), MILITARY STANDARD: WELDED-JOINT DESIGNS, ARMORED-TANK TYPE (15 APR 1974) [S/S BY MIL-HDBK-21].

MIL-STD-21A (NOTICE 3), MILITARY STANDARD: WELDED-JOINT DESIGNS, ARMORED-TANK TYPE (29 NOV 1995) [S/S BY MIL-HDBK-21]., MIL-STD-21 A, dated 9 May 1979, is hereby canceled. Future acquisitions for this item should refer to MIL-HDBK-21, "Welded Joint Designs, Armored Tank Type".

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【英文标准名称】:Ophthalmicimplants-Intraocularlenses-Biocompatibility
【原文标准名称】:眼科植入物.眼内透镜.生物兼容性性
【标准号】:BSEN13503-5-2001
【标准状态】:作废
【国别】:英国
【发布日期】:2001-05-15
【实施或试行日期】:2001-05-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:生物适合性
【英文主题词】:Bioassay;Biocompatibility;Implantationtest;Intraocularlenses;Lenses;Ophtalmicoptics;Opticalinstruments;Optics;Specification(approval);Surgicalimplants;Testing
【摘要】:ThispartofEN13503ISO11979specifiesparticularrequirementsforthethebiologicalevaluationofintraocularlenses(IOLs)whichareinadditiontotherequirementsoutlinedintherelevantpartsofENISO10993.Italsogivesguidanceonconductinganocularimplantationtest.
【中国标准分类号】:C32
【国际标准分类号】:11_040_70;11_100_20
【页数】:24P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforStaticandKineticCoefficientsofFrictionofPlasticFilmandSheeting
【原文标准名称】:测定塑料薄膜和薄板静摩擦和动摩擦系数的标准试验方法
【标准号】:ASTMD1894-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D20.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:friction;kineticcoefficientoffriction;plasticfilm;plasticsheeting;slip;staticcoefficientoffriction;Coefficientoffriction(COF)--plastics;Kineticfrictionanalysis;Plasticsheetandfilm;Staticcoefficientoffriction;Statictests--plas
【摘要】:Measurementsoffrictionalpropertiesmaybemadeonafilmorsheetingspecimenwhenslidingoveritselforoveranothersubstance.Thecoefficientsoffrictionarerelatedtotheslippropertiesofplasticfilmsthatareofwideinterestinpackagingapplications.Thesemethodsyieldempiricaldataforcontrolpurposesinfilmproduction.Correlationoftestresultswithactualperformancecanusuallybeestablished.Thistestmethodincludestestingattemperaturesotherthan23x00B0;Cbyheatingonlytheplanewhilethesledisatambienttemperature.Slippropertiesaregeneratedbyadditivesinsomeplasticfilms,forexample,polyethylene.Theseadditiveshavevaryingdegreesofcompatibilitywiththefilmmatrix.Someofthembloom,orexudetothesurface,lubricatingitandmakingitmoreslippery.Becausethisbloomingactionmaynotalwaysbeuniformonallareasofthefilmsurface,valuesfromthesetestsmaybelimitedinreproducibility.Thefrictionalpropertiesofplasticfilmandsheetingmaybedependentontheuniformityoftherateofmotionbetweenthetwosurfaces.Careshouldbeexercisedtoensurethattherateofmotionoftheequipmentisascarefullycontrolledaspossible.Dataobtainedbytheseproceduresmaybeextremelysensitivetotheageofthefilmorsheetandtheconditionofthesurfaces.Thebloomingactionofmanyslipadditivesistime-dependent.Forthisreason,itissometimesmeaninglesstocompareslipandfrictionpropertiesoffilmsorsheetsproducedatdifferenttimes,unlessitisdesiredtostudythiseffect.Frictionalandslippropertiesofplasticfilmandsheetingarebasedonmeasurementsofsurfacephenomena.Whereproductshavebeenmadebydifferentprocesses,orevenondifferentmachinesbythesameprocess,theirsurfacesmaybedependentontheequipmentoritsrunningconditions.Suchfactorsmustbeweighedinevaluatingdatafromthesemethods.Themeasurementofthestaticcoefficientoffrictionishighlydependentontherateofloadingandontheamountofblockingoccurringbetweentheloadedsledandtheplatformduetovariationintimebeforemotionisinitiated.Careshouldbeexercisedtomakecertainthatthespeedofresponseoftherecorder,eitherelectronicormechanical,isnotexceeded.Formanymaterials,theremaybeaspecificationthatrequirestheuseofthistestmethod,butwithsomeproceduralmodificationsthattakeprecedencewhenadheringtothespecification.Therefore,itisadvisabletorefertothatmaterialspecificationbeforeusingthistestmethod.Table1ofClassificationSystemD4000liststheASTMmaterialsstandardsthatcurrentlyexist.1.1Thistestmethodcoversdeterminationofthecoefficientsofstartingandslidingfrictionofplasticfilmandsheetingwhenslidingoveritselforothersubstancesatspecifiedtestconditions.Theprocedurepermitstheuseofastationarysledwithamovingplane,oramovingsledwithastationaryplane.Bothproceduresyieldthesamecoefficientsoffrictionvaluesforagivensample.Note18212;Forthefrictionalcharacteristicsofplasticfilmspartiallywrappedaroundacylinder,orcapstan,seeTestMethodG143underthejurisdictionofASTMSubcommitteeG02.50.1.2Testdataobtainedbythistestmethodisrelevantandappropriateforuseinengineeringdesign.1.2.1Asanoptiontothistest,coefficientoffrictionmayberunattemperaturesotherthan23x00B0;Cbyheatingonlytheplanewhilethesledisatambienttemperature.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.