NF C66-131-1975 架空线路用绝缘子和器材.外带金属加固件的长杆型陶瓷绝缘子.特性.尺寸

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下一篇: IEC 60515-1975 核反应堆测量仪表和防护用辐射探测器特性和试验方法

【英文标准名称】:StandardPracticeforDeterminingDegradationEndPointinDegradablePolyethyleneandPolypropyleneUsingaTensileTest
【原文标准名称】:用拉伸试验对聚乙烯和聚丙烯老化过程的最终老化点的测定
【标准号】:ASTMD3826-1998(2002)
【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(ASTM)
【起草单位】:D20.96
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:试验;塑料
【英文主题词】:brittlepoint;degradableplastics;plastics;polyethylene/polypropylenefilms/sheeting;tensileelongation;
【摘要】:Thetensileelongationpropertydeterminedbythispracticeisofvalueforthecharacterizationofdegradablematerials.Thetensileelongationpropertymayvarywithspecimenthickness,methodofpreparation,speedoftesting,typeofgripsused,andmannerofmeasuringtestextension.Consequently,whereprecisecomparativeresultsaredesired,thesefactorsmustbecarefullycontrolled.Thetensileelongationpropertymaybeutilizedtoprovidedataforresearchanddevelopmentandengineeringdesignaswellasqualitycontrolspecifications.However,datafromsuchtestscannotbeconsideredsignificantforapplicationsdifferingwidelyfromtheload-timescaleofthetestemployed.Materialsthatfailbytearinggiveanomalousdatathatcannotbecomparedwiththosefromnormalfailure.Beforeproceedingwiththistestmethod,referenceshouldbemadetothespecificationsofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparametersoracombinationthereof,coveredinthematerialspecificationsshalltakeprecedenceoverthosementionedinthistestmethod.Iftherearenomaterialspecifications,thenthedefaultconditionsapply.1.1Thispracticecoversthedeterminationofadegradation-endpoint(abrittlepoint)fordegradablepolyethylene/polypropylenefilmsandsheetinglessthan1.0mm(0.04in.)thick.Thispracticeisnotintendedfordeterminationoftherateofdegreeofdegradationofapolyethylene/polypropylenefilmorsheet,butrather,toassesswheninthecourseofitsdegradationundersomecondition,abrittlepointisreached.Ifonewishestomonitortensileelongationduringthedegradationprocess(suchaswhenthetensileelongationissignificantlygreaterthan5%),TestMethodD882isrecommended.Thispracticeshouldnotbeconsideredtheonlywayofdeterminingadegradation-endpoint.1.2Tensilepropertiesofplastics1.0mm(0.04in.)orgreaterinthicknessshallbedeterminedinaccordancewithTestMethodD638.1.3Useastaticweighing-constantrateofgripseparationtest.Thisprocedureemploysaconstantrateofseparationofthegripsholdingthesampleandastaticloadcell.Note18212;Thisprocedureisbasedontheuseofgripseparationasameasureofextension;however,thedesirabilityofusingextensionindicatorsaccurateto177;1.0%orbetterasspecifiedinTestMethodD638isrecognized,andaprovisionfortheuseofsuchinstrumentationisincorporatedintheprocedure.1.4Thisprocedurehasbeensuccessfulfordeterminingthedegradationendpointofethylene-carbon-monoxidecopolymersandhasscreenedsuccessfullytwootheradditive-typepolyethylenesinaroundrobintest.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.7ThereisnoequivalentISOstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:4P.;A4
【正文语种】:


【英文标准名称】:Safetyofmachinery;minimumgapstoavoidcrushingofpartsofthehumanbody;GermanversionEN349:1993
【原文标准名称】:机器的安全性.避免身体部位受到挤压的最小距离
【标准号】:DINEN349-1993
【标准状态】:作废
【国别】:德国
【发布日期】:1993-06
【实施或试行日期】:1993-06-01
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:事故预防;距离;加工设备;最小空隙;EU-法规;机器;安全工程;工作场所安全;挤压位置;种植;安全距离;躯体部位;机械卷边连接;定义;长度;机械工程;职业安全;仪器;危害;尺寸;壳体;安全;工作物质
【英文主题词】:Accidentprevention;Bodies;Bodyregions;Definition;Definitions;Dimensions;Distances;Hazards;Instruments;Length;Machines;Mechanicalcrimping;Mechanicalengineering;Minimumspacing;Occupationalsafety;Plant;Productionequipment;Safety;Safetydistances;Safetyengineering;Safetyofmachinery;Safetyprovisions;Squeezepositions;Workingsubstances;Workplacesafety
【摘要】:Theaimofthedocumentistoenablestandardmakers,designersofmachineryetc.toreducetherisksfromcrushingzones.Itspecifiesminimumgapsrelativetotherespectivehumanbodyparts.Thedocumentisnotapplicabletorisksfromimpact,shearingandtrappinghazards.
【中国标准分类号】:A25
【国际标准分类号】:13_110
【页数】:6P.;A4
【正文语种】:德语