硬度仪原理分析解析课件.ppt

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1、BasicsofInstrumentedIndentationTestforHardnessandMaterialParametersaccordingtoENISO14577HardnesstestinginstrumentsHELMUTFISCHERAG杨杰1.introduction2.standardizationoftheinstrumentedindentationtest3.measuringprinciple4.hardnessandmaterialparameter-definitionanddetermination5.fac

2、torsaffectingthemeasurementstructure1.introduction2.standardizationoftheinstrumentedindentationtest3.measuringprinciple4.hardnessandmaterialparameter-definitionanddetermination5.factorsaffectingthemeasurementstructureintroductionknowledgeofmaterialproperties-importantforthei

3、rapplicabilityinalltechnicalproductsnotonlybulkproperties-surfaceproperties(coatings,mechanicaltreatment…)hardnesstesting-usedforcharacterizationandqualitycontrolofmaterialsresultinghardnessvaluesareworldwidewellacceptedHOWEVERahardnessvalue:isnotanabsolutephysicalvalue!(lik

4、elength,current,mass…)dependsineachcaseonthetestmethod!advantages:fastandcheapmeasurement(quasi-)nondestructivemethodhardnessvaluesarecorrelatedwithothermechanicalpropertiesdifferentapplicationranges:nanohardness-microhardness–macrohardnessrespectivemeasurementtechniquest

5、raditionalhardnesstesting(macrohardness):applicationofasinglestaticforcewithinagivendwelltimespecifictipshapeandmaterial(Vickers,Rockwell,Brinell,Knoop…)resultinghardnessimpressionafterremovaloftheindentorismeasuredopticallyhardnessvalue:-the“resistance”ofthematerialtothe

6、indentation(plastic)-measureoftherelativepenetrationdepthofthetipintothesampledisadvantagesandlimitsofthetraditionalhardnesstesting:limitedmainlytothemacroscopicrange(bulkmaterial,thickcoatings…)toohighuncertaintyofopticallengthmeasurementforsmallindentationdepths,thincoat

7、ings…highinfluenceoftheoperator(opticalmeasurement)darkormatsurfacesrequirespecialtreatments(opticalmeasurement)resultofthemeasurementisonlyonehardnessvalue–nofurtherinformationaboutadditionalmaterialpropertiesisprovidedhardnessvalueisonlyameasureoftheplasticmaterialprope

8、rties–noinformationaboutelasticpropertiessolution:instrumentedindent