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1、SpecialAssignmentAddfigures/graphicstoallslidesUsebulletsinsteadofshortsentencesForthe15’presentationsusefonts18orbigger;however,forthe50’,fontsizes10,12,14arefine.Youmayuse16or18fortitles.AddyoursummaryslideGraphicsshouldhelptoexplainthetopicCHAPTER7: MECHANICALPROPERTIESCHAPTER7: M
2、ECHANICALPROPERTIESISSUESTOADDRESS...•Stressandstrain•Elasticbehavior•Plasticbehavior•ToughnessandductilityCeramicMaterialsStressStrainElasticityStrengthTensileElongationDuctileFractureTensionFlexuralPlasticity4•Tensilestress,s:•Shearstress,t:Stresshasunits:N/m2orlb/in27.2STRESS&STRA
3、INc07f01TensileloadCompressiveloadShearstraing=tanqTorsionaldeformationangleoftwist,fStress(s)fortensionandcompressionStrain(e)fortensionandcompressionShearstress5•Simpletension:cable•Simpleshear:driveshaftNote:t=M/AcSkilift(photocourtesyP.M.Anderson)7.2COMMONSTATESOFSTRESS6•Simpleco
4、mpression:Note:compressivestructuremember(s<0here).(photocourtesyP.M.Anderson)(photocourtesyP.M.Anderson)OTHERCOMMONSTRESSSTATES7•Bi-axialtension:•Hydrostaticcompression:Pressurizedtanks<0h(photocourtesyP.M.Anderson)(photocourtesyP.M.Anderson)OTHERCOMMONSTRESSSTATES8•Tensilestrain:•L
5、ateralstrain:•Shearstrain:Strainisalwaysdimensionless.ENGINEERINGSTRAIN•Typicaltensilespecimen9•Othertypesoftests:--compression:brittlematerials(e.g.,concrete)--torsion:cylindricaltubes,shafts.•TypicaltensiletestmachineAdaptedfromFig.6.2,Callister6e.AdaptedfromFig.6.3,Callister6e.(Fi
6、g.6.3istakenfromH.W.Hayden,W.G.Moffatt,andJ.Wulff,TheStructureandPropertiesofMaterials,Vol.III,MechanicalBehavior,p.2,JohnWileyandSons,NewYork,1965.)7.2STRESS-STRAINTESTINGc07f04NormalandshearstressesonanarbitraryplaneStressisafunctionoftheorientationOnplanep-p’thestressisnotpuretens
7、ileTherearetwocomponentsTensileornormalstresss’(normaltothepp’plane)Shearstresst’(paralleltothepp’plane)•ModulusofElasticity,E:(alsoknownasYoung'smodulus)10•Hooke'sLaw:s=Ee•Poisson'sratio,n:metals:n~0.33ceramics:~0.25polymers:~0.40Units:E:[GPa]or[psi]n:dimensionlessELASTICDEFORMATION
8、S 7.3Stress-
