【英文标准名称】:Plastics-Verificationofpendulumimpact-testingmachines-Charpy,Izodandtensileimpact-testing
【原文标准名称】:塑料摆锤冲击试验机的鉴定却贝、艾卓德和拉伸冲击试验
【标准号】:ISO13802-1999
【标准状态】:现行
【国别】:国际
【发布日期】:1999-10
【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/TC61
【标准类型】:()
【标准水平】:()
【中文主题词】:材料试验机;定义;塑料;证实;冲击断裂试验;艾卓德(冲击试验);却贝(摆式冲击试验);摆锤式冲击试验机
【英文主题词】:Charpy;Definitions;Design;Izod;Materialtestingmachines;Measurement;Mechanicalproperties;Pendulumimpacttestingmachines;Plastics;Properties;Shockrupturetests;Specimenpreparation;Tensiletesting;Testing;Validation;Verification
【摘要】:ThisInternationalStandardspecifiesmethodsfortheverificationofpendulumimpact-testingmachinesusedfortheCharpyimpacttest,IzodimpacttestandtensileimpacttestdescribedinISO179-1,ISO180andISO8256,respectively.ThetestmachinescoveredbythisInternationalStandardareofthependulumtype.TheimpactenergyW(see3.12)absorbedinimpactingatestspecimenistakenasbeingequaltothedifferencebetweenthepotentialenergyE(see3.11)ofthependulumandtheenergyremaininginthependulumafterimpactingthespecimen.Theimpactenergyiscorrectedforfrictionandair-resistancelosses(seeTable2and5.6).Methodsaredescribedforverificationofthegeometricalandphysicalpropertiesofthedifferentpartsofthetestmachine.Theverificationofsomegeometricalpropertiesisdifficulttoperformontheassembledinstrument.ItisthereforeassumedthatthemanufacturerisresponsiblefortheverificationofsuchpropertiesandforprovidingreferenceplanesontheinstrumentthatenableproperverificationinaccordancewiththisInternationalStandard.Thesemethodsareforusewhenthemachineisbeinginstalled,isbeingrepaired,hasbeenmovedorisundergoingperiodicchecking.ThisInternationalStandardisapplicabletopendulum-typeimpact-testingmachines,ofdifferentcapacitiesand/ordesigns,withthegeometricalandphysicalpropertiesdefinedinclause5.Apendulumimpact-testingmachineverifiedinaccordancewiththisInternationalStandard,andassessedassatisfactory,isconsideredsuitableforimpacttestingwithunnotchedandnotchedtestspecimensofdifferenttypes.AnnexAdescribestherelationshipsbetweenthevariouscharacteristicpendulumlengths,thepotentialenergyandthemomentofinertiaofthependulum.AnnexBexplainshowtocalculatetheratioofframemasstopendulummassrequiredtoavoiderrorsintheimpactenergy.AnnexCdescribes,forCharpyimpacttesting,thechangesinpendulumvelocityjustafterimpactasafunctionofimpactenergyandgivestherangesofimpactenergiesforthemeasurementofwhichpendulumsofspecifiedcapacityhavetobeused.AnnexDdiscussesthestiffnessofthebaseoftheframenecessarytoavoidresonantoscillationsintheframeduetoreactionforcescausedbythemovingpendulum.AnnexEgivesthedimensionsofagaugeplatesuitablefortheverificationofCharpyimpact-testingmachines.
【中国标准分类号】:G31
【国际标准分类号】:83_200
【页数】:36P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodsforStressRelaxationTestsforMaterialsandStructures
【原文标准名称】:材料和结构件的应力松弛试验
【标准号】:ASTME328-2002
【标准状态】:现行
【国别】:
【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(ASTM)
【起草单位】:E28.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bendingrelaxation;bolting;compressionrelaxation;hoopstresses;riveting;springs;stressrelaxation;tensionrelaxation;torsionrelaxation
【摘要】:Relaxationtestdataarenecessarywhendesigningmostmechanicallyfastenedjointstoassurethepermanenttightnessofboltedorrivetedassemblies,pressorshrink-fitcomponents,rolled-intubes,etc.Otherapplicationsincludepredictingthedecreaseinthetightnessofgaskets,inthehoopstressofsolderlesswrappedconnections,intheconstrainingforceofsprings,andthestabilityofwiretendonsinprestressedconcrete.Theabilityofamaterialtorelaxathigh-stressconcentrationssuchasarepresentatnotches,inclusions,cracks,holes,fillets,etc.,maybepredictedfromstressrelaxationdata.Suchtestdataarealsousefultojudgetheheat-treatmentconditionnecessaryforthethermalreliefofresidualinternalstressesinforgings,castings,weldments,machinedorcold-workedsurfaces,etc.Thetestsoutlinedinthesemethodsarelimitedtoconditionsofapproximatelyconstantconstraintandenvironment.Thetestresultsarehighlysensitivetosmallchangesinenvironmentalconditionsandthusrequireprecisecontroloftestconditionsandmethods.Thereproducibilityofdatawilldependonthemannerwithwhichalltestconditionsarecontrolled.Theeffectsofagingorresidualstressmaysignificantlyaffectresults,asmayvariationsinmaterialcomposition.Note18212;Themethodoftestingforthestressrelaxationofplasticshasbeenwithdrawnfromthisstandard,andtheresponsibilityhasbeentransferredtoPracticeD2991.1.1Thesetestmethodscoverthedeterminationofthetimedependenceofstress(stressrelaxation)inmaterialsandstructuresunderconditionsofapproximatelyconstantconstraint,constantenvironment,andnegligiblevibration.Intheproceduresrecommended,thematerialorstructureisinitiallyconstrainedbyexternallyappliedforces,andthechangeintheexternalforcenecessarytomaintainthisconstraintisdeterminedasafunctionoftime.1.2Specificmethodsforconductingstressrelaxationtestsonmaterialssubjectedtotension,compression,bendingandtorsionstressesaredescribedinPartsA,B,C,andD,respectively.Thesetestmethodsalsoincluderecommendationsforthenecessarytestingequipmentandfortheanalysisofthetestdata.1.3Itisrecognizedthatthelongtimeperiodsrequiredforthesetypesoftestsareoftenunsuitedforroutinetestingorforspecificationinthepurchaseofmaterial.However,thesetestsarevaluabletoolsinobtainingpracticaldesigninformationonthestressrelaxationofmaterialssubjectedtotheconditionsenumerated,andininvestigationsofthefundamentalbehaviorofmaterials.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:
【国际标准分类号】:19_020
【页数】:13P.;A4
【正文语种】: