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1、Lab2b:FractureToughnessFu,AmyScott,ShinShan,SiSiSon,JenniferWen,AlexanderDateSubmitted:February24,2011DatePerformed:February17,2011LabSection:104(Group20)LabGSI:HuaXiangAbstractThepurposeofthislabistostudythefracturetoughnessofAISI1040steel,andtoobservehowheattreatmentaffectsthisproper
2、ty.TheCharpyimpacttestisusedtomeasuretheamountofenergythatheat-treatedandnon-heat-treatedsampleswillabsorbbeforefracturing.Thisenergyisdirectlyrelatedtothematerials’toughness.Inthetest,ahammerisraisedtoacertainheightandreleased;thedifferenceinitsoriginalheightanditspost-impactheightpro
3、videstheenergyabsorbedbythematerial.Theresultsoftheexperimentshowthatheattreatmenthasanoticeableeffectonthesteel’stoughness–heat-treatedsteelismuchtoughereventhoughitisbrittle,whereasnon-heat-treatedsteelisductile,yetlesstough.Thislabissignificantbecauseitdemonstrateshowtoisolateandstu
4、dyaparticularpropertyofinterest,usingbothquantitative(data-based)andqualitative(observation-based)analyses.1.IntroductionThepurposeofthislabistostudythefracturetoughnessofmaterials–inparticular,theobjectiveistoobservehowheattreatmentaffectsthetoughnessofAISI1040steel.Thisisdoneusingthe
5、Charpyimpacttest,whichisacommonlyusedstandardizedtestformeasuringthefracturetoughnessofamaterial.Duetoitssimplicityandlowcostofoperation,theCharpytestiswidelyusedintheengineeringindustry[1],meaningthatitiscrucialforallengineeringstudentstobefamiliarwiththistest.Additionally,thesignific
6、anceofthislabisthatitfocusesonobservingtheeffectthatheattreatmenthasonthespecificpropertyofductility;inengineering,itisimportanttoknowhowtoisolatethepropertiesofinterest(thatis,selectthebesttesttostudythoseproperties)inordertoobservetheeffectsthatcertaintreatmentshaveonthem.Thetwomainc
7、onstituentsoftheimpacttestareahammerandaV-notchedsample.TheV-notchbehavesasa‘flaw,’orapointofweaknessinthematerialwherefailureismostlikelytooccur.Thesizeandlocationofthenotcharestandardizedtokeepresultsconsistentbetweensamples.ThetheorybehindtheCharpytestisthatamaterial’stoughnessisd
