-Unlicensed-塑料热性能测试英语

ttPlasticthermalperformancetest主讲人：杨崇岭电脑热变形维卡软化点测定仪负荷热变形温度测定仪数显智能温控线膨胀系数测定仪熔融指示仪塑料低温冲击脆化温度测定仪WordsandExpressionsbesubjectedto 受corresponding 相应的flexural 弯曲striking [ˈstraɪkɪŋ]

adj.引人注目的;显著的coefficient 系数quartz 石英differential [ˌdɪfəˈrɛnʃəl]adj.差别的calorimeter 量热仪thermocouple 热电偶flux 通量curve 曲线clamped 夹provision [prəˈvɪʒən]n.规定，条项brittleness 脆性1ThermaldeformationtestAstandardtestspecimenissubjectedtothree-pointbendingunderaconstantloadintheflatwise(preferred)ortheedgewisepositiontoproduceoneoftheflexuralstressesgivenintherelevantpartofthisInternationalStandard.Thetemperatureisraisedatauniformrate,andthetemperatureatwhichthestandarddeflection,correspondingtothespecifiedincreaseinflexuralstrain,occursismeasured.1ThermaldeformationtestUnlessotherwisespecifiedintherelevantpartofthisintemationalStandard,expresstheflexuraltemperatureofthematerialundertestresultstothenearestdegreeCelsius.2Lowtemperaturebrittlenesstemperature Thestrikingedgeshallmoverelativetothetestpiece(s)alongapathnormaltotheuppersurfaceofthetestpiece(s)atalinear

testing

speedof0,2m/satimpact.Thespeedshallbemaintainedwithinthisrangeforatleast6mmoftravelfollowingtheimpact.2LowtemperaturebrittlenesstemperatureInordertoobtainaspeedwithinthespecifiedlimitsduringandafterimpact,careshallbetakentoensurethatthestrikingenergyissufficient.Ithasbeenfoundthatastrikingenergyofatleast3,0Jpertestpieceisnecessary.Itmight,therefore,benecessarytolimitthenumberoftestpiecesimpactedatonetime.3Plasticlinearexpansioncoefficienttest

Thecoefficientoflinearexpansionisthepercentagechangeinthelengthofthematerialperunitlengthof1degreesCelsius.3PlasticlinearexpansioncoefficienttestThemeasurementoftheoriginallengthofthespecimenintothequartzdilatometer,andtheexpansionoftheconstanttemperaturebathtemperaturemeterhasinsertedintodifferent,indicatingthevalueofstabletemperatureandconstanttemperaturebathintheinstrumenttemperaturebalanceandmeasuringthechangesinlength,recordthereadings,bythesampleexpansionandcontractionexpansioncoefficientofthesamplevaluecanbecalculated.4Plasticmelttemperaturetest Themeltingtemperatureisforplastics,rubberandothermaterials,thelaboratoryusuallyusesadifferentialscanningcalorimeter(DSC)tomeasure. Theinstrumentthroughthethermocouplecollectingheatfluxmaterialsintheheatingorcoolingprocess,drawthecurve,becausethematerialwillabsorbheatinthemeltingpoint,curveappearsharppeakhere,thepeaktemperatureisthemeltingtemperatureofthematerial.5Lowtemperaturebrittleness

Undertheconditionofspecifiedstressanddeformation,thetemperatureofthespecimenismeasured. Agroupofsamplesclampedintestmachine,constanttemperatureatlowtemperature,totheprovisionsofthepunchintheprescribedspeedimpactspecimen,thefixturealongthelowerjawarcbending90