作者:标准资料网 时间:2024-04-28 15:04:58   浏览:8860   来源:标准资料网

【英文标准名称】:StandardTestMethodforPlastics:DynamicMechanicalProperties:InTorsion
【原文标准名称】:塑料扭力的动力机械性能测量的标准试验方法
【标准号】:ASTMD5279-2008
【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】:D20.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:dynamicmechanicalrheologicalproperties;elastic;loss;storage;tandelta;torsionalshearmodulus;viscoelasticbehavior;viscous;Dynamicmechanicalanalysis(DMA)--plastics;Instrumentalmeasurement--plastics;Sheartesting--plastics;Tandelta;Tor
【摘要】:Thistestmethodprovidesasimplemeansofcharacterizingthethermomechanicalbehaviorofplasticsmaterialsusingverysmallamountsofmaterial.Thedataobtainedmaybeusedforqualitycontrol,researchanddevelopment,andestablishmentofoptimumprocessingconditions.Dynamicmechanicaltestingprovidesasensitivemethodfordeterminingthermomechanicalcharacteristicsbymeasuringtheelasticandlossmoduliasafunctionoffrequency,temperature,ortime.Plotsofmoduliandtandeltaofamaterialversustemperatureprovidegraphicalrepresentationsindicativeoffunctionalproperties,effectivenessofcure(thermosettingresinsystem),anddampingbehaviorunderspecifiedconditions.ThistestmethodcanbeusedtoassessThemodulusasafunctionoftemperature,Themodulusasafunctionoffrequency,Theeffectsofprocessingtreatment,includingorientation,Relativeresinbehavioralproperties,includingcureanddamping,Theeffectsofsubstratetypesandorientation(fabrication)onelasticmodulus,andTheeffectsofformulationadditivesthatmightaffectprocessabilityorperformance.Beforeproceedingwiththistestmethod,referenceshouldbemadetothespecificationofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparameters,orcombinationthereof,coveredintherelevantASTMmaterialsspecificationshalltakeprecedenceoverthosementionedinthistestmethod.IftherearenorelevantASTMmaterialsspecifications,thenthedefaultconditionsapply.1.1Thistestmethodcoverstheuseofdynamicmechanicalinstrumentationforgatheringandreportingtheviscoelasticpropertiesofthermoplasticandthermosettingresinsandcompositesystemsintheformofrectangularspecimensmoldeddirectlyorcutfromsheets,plates,ormoldedshapes.Thetorsionaldatageneratedmaybeusedtoidentifythethermomechanicalpropertiesofaplasticsmaterialorcomposition.1.2Thistestmethodisintendedtoprovidemeansfordeterminingthetorsionalmodulusofplasticsasafunctionoftemperatureusingnonresonantforced-vibrationtechniques,asoutlinedinPracticeD4065.Plotsoftheelastic(storage),loss(viscous),andcomplexmoduliandtandelta,asafunctionoffrequency,time,ortemperatureareindicativeofsignificanttransitionsinthethermomechanicalperformanceofthepolymericmaterialsystem.1.3Thistestmethodisvalidforawiderangeoffrequencies,typicallyfrom0.01to100Hz.1.4Apparentdiscrepanciesmayariseinresultsobtainedunderdifferingexperimentalconditions.Theseapparentdifferencesfromresultsobservedinanotherstudycanusuallybereconciledwithoutchangingtheobserveddatabyreportinginfull(asdescribedinthistestmethod)theconditionsunderwhichthedatawereobtained.1.5Testdataobtainedbythistestmethodarerelevantandappropriateforuseinengineeringdesign.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThistestmethodisequivalenttoISO6721,Part7.
【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】:英语