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1、KeysightTechnologiesMechanicalCharacterizationofBrownandGreyHairApplicationNoteIntroductionMostpeoplewhohavesomeofbothThepatenteddesignoftheT150TensilehairtypesperceivedeinitedifferencesTesterconfersseveraladvantagesforbetweenpigmentedandunpigmentedtestinghair1.Firs
2、t,ithasunparalleled(grey)hair.Thevocabularyofcommonaccuracyandresolution,becausetheexpressionleadsonetobelievethatthereactionforceisgeneratedelectromag-perceiveddifferencesareeffectivelyme-netically,notbypassivedelectionofachanical:greyhairissaidtobe“stiffer,”spring
3、.FortheT150,theforcecapacitymore“wiry,”andgenerallymoreunruly.andresolutionare500mNand50nN,Inthiswork,wedemonstratetheexperi-respectively.Second,adynamicoscil-mentaladvantagesofferedbythecom-lationcanbesuperimposeduponthebinationoftwonano-scaleanalytictoolssemi-stat
4、icreactionforce.ThisdynamicfromKeysightTechnologies,Inc.Thesuperpositionhasanumberofadvan-8500FE-SEM(Field-EmissionScanning-tages.ItallowsthemeasurementofElectronMicroscope)wasusedtomakemodulusasacontinuousfunctionofhighlyresolveddiametermeasurements,strain,evenafte
5、rtheonsetofplasticity.andtheT150TensileTesterwasusedtoThiscapabilityhasbeenshowntobedothemechanicaltesting.especiallyimportantforcharacterizingsyntheticandnaturalpolymeribers,Uncertaintyanalysisrevealsthatdiameterbecausethedeformationmechanismsisthemostcriticalmeasu
6、rementinthechangeasafunctionofstrain.AtlowdeterminationoftheYoung’smodulusstrains,thepolymerchainsunwind;atofaineibersuchashair,bothbecausehighstrains,theystretch.Forexample,thediameterissmallandbecausetheBlackledgeetal.foundthatthesilkquantityissquaredinthecalculat
7、ionofofablackwidowspider(Latrodectuscross-sectionalarea.Thus,usingthe8500Hesperus)hasamodulusof10GPaatFE-SEMtomeasurediameterwithareso-10%strain,butamodulusof30GPaatlutionofnanometersdramaticallyreduces30%strain2.AnotheradvantageofthetheuncertaintyoftheresultingYoun
8、g’sdynamicoscillationisthatitoffersthemodulus.(Mostpublishedstudiesonhaircapabilityofmeasuringlossmodu-reportusingmicrometerstomeasurehair
