-Unlicensed-塑料熱性能測試英語

ttPlasticthermalperformancetest主講人：楊崇嶺電腦熱變形維卡軟化點(diǎn)測定儀負(fù)荷熱變形溫度測定儀數(shù)顯智能溫控線膨脹系數(shù)測定儀熔融指示儀塑料低溫沖擊脆化溫度測定儀WordsandExpressionsbesubjectedto 受corresponding 相應(yīng)的flexural 彎曲striking [?stra?k??]

adj.引人注目的;顯著的coefficient 系數(shù)quartz 石英differential [?d?f??r?n??l]adj.差別的calorimeter 量熱儀thermocouple 熱電偶flux 通量curve 曲線clamped 夾provision [pr??v???n]n.規(guī)定，條項(xiàng)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