【英文标准名称】:Analysistechniquesfordependability.Reliabilityblockdiagrammethod.
【原文标准名称】:可靠性分析技术.可靠性方块图法
【标准号】:NFC20-341-1994
【标准状态】:现行
【国别】:法国
【发布日期】:1994-10-01
【实施或试行日期】:1994-10-05
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:可靠性分析;符号;试验;试验技术;定义;图示;可靠度;系统;方块图;电气工程;可靠性试验;有效性;分析方法;数学计算;分析;模型
【英文主题词】:Analysis;Analysismethods;Availability;Blockdiagrams;Definition;Definitions;Diagrams;Electricalengineering;Mathematicalcalculations;Models;Reliability;Reliabilityanalysis;Reliabilitytesting;Symbols;Systems;Testtechniques;Testing
【摘要】:
【中国标准分类号】:L05
【国际标准分类号】:29_020
【页数】:32P.;A4
【正文语种】:其他


【英文标准名称】:StandardTestMethodforPlastics:DynamicMechanicalProperties:InFlexure(Three-PointBending)
【原文标准名称】:塑料的标准试验方法:动态机械性能:弯曲(三点弯曲)
【标准号】:ASTMD5023-2007
【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】:D20.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:流动能力;弯曲测试;塑料;测试;热固性聚合物
【英文主题词】:dynamicmechanicalrheologicalproperties;elastic;flexuralviscoelasticbehavior;lineardisplacement;loss;storagemodulus;tandelta
【摘要】:Thistestmethodprovidesasimplemeansofcharacterizingthethermomechanicalbehaviorofplasticcompositionsusingverysmallamountsofmaterial.Thedataobtainedmaybeusedforqualitycontrol,researchanddevelopmentaswellastheestablishmentofoptimumprocessingconditions.Dynamicmechanicaltestingprovidesasensitivemeansfordeterminingthermomechanicalcharacteristicsbymeasuringtheelasticandlossmoduliasafunctionoffrequency,temperature,ortime.Plotsofmoduliandtandeltaofamaterialversusthesevariablescanbeusedtoprovideagraphicalrepresentationindicativeoffunctionalproperties,effectivenessofcure(thermosettingresinsystem),anddampingbehaviorunderspecifiedconditions.Thistestmethodcanbeusedtoassess:5.3.1Modulusasafunctionoftemperature,5.3.2Modulusasafunctionoffrequency,5.3.3Theeffectsofprocessingtreatment,5.3.4Relativeresinbehavioralproperties,includingcureanddamping.5.3.5Theeffectsofsubstratetypesandorientation(fabrication)onmodulus,and5.3.6Theeffectsofformulationadditiveswhichmightaffectprocessabilityorperformance.Beforeproceedingwiththistestmethod,refertothespecificationofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparameters,orcombinationthereof,coveredintherelevantASTMmaterialsspecificationshalltakeprecedenceoverthosementionedinthistestmethod.IftherearenorelevantASTMmaterialspecifications,thenthedefaultconditionsapply.1.1Thistestmethodoutlinestheuseofdynamicmechanicalinstrumentationfordeterminingandreportingthevisco-elasticpropertiesofthermoplasticandthermosettingresinsandcompositesystemsintheformofrectangularbarsmoldeddirectlyorcutfromsheets,plates,ormoldedshapes.Thedatagenerated,usingthree-pointbendingtechniques,maybeusedtoidentifythethermomechanicalpropertiesofaplasticmaterialorcompositionsusingavarietyofdynamicmechanicalinstruments.1.2Thistestmethodisintendedtoprovidemeansfordeterminingtheviscoelasticpropertiesofawidevarietyofplasticsmaterialsusingnonresonant,forced-vibrationtechniquesinaccordancewithPracticeD4065.Plotsoftheelastic(storage)modulus;loss(viscous)modulus;complexmodulusandtandeltaasafunctionoffrequency,time,ortemperatureareindicativeofsignificanttransitionsinthethermomechanicalperformanceofpolymericmaterialsystems.1.3Thistestmethodisvalidforawiderangeoffrequencies,typicallyfrom0.01to100Hz.1.4Apparentdiscrepanciesmayariseinresultsobtainedunderdifferingexperimentalconditions.Theseapparentdifferencesfromresultsobservedinanotherstudycanusuallybereconciled,withoutchangingtheobserveddata,byreportinginfull(asdescribedinthistestmethod)theconditionsunderwhichthedatawereobtained.1.5Duetopossibleinstrumentationcompliance,thedatageneratedareintendedtoindicaterelativeandnotnecessarilyabsolutepropertyvalues.1.6Testdataobtainedbythistestmethodarerelevantandappropriateforuseinengineeringdesign.1.7ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note1ThistestmethodisequivalenttoISO6721,Part5.
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:4P.;A4
【正文语种】: