mechanics of composite materials课件 (2)课件

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1、HanyanguniversityStructures&CompositesLaboratoryMechanicsofCompositeMaterialsMechanicsofCompositeMaterialsSungKyuHaDept.ofMechanicalEngineeringHanyangUniversityHanyanguniversityStructures&CompositesLaboratoryContents-ListHanyanguniversityStructures&CompositesLaborat

2、oryContents-Chap5Chapter5.Strengthofcompositematerials5.1.Plystrength5.2.Experimentaltestofplystrength5.3.Plystrength(3-D)5.4.FailureCriterion5.5.DerivationofQuadraticFailureCriterion(1)5.6.DerivationofQuadraticFailureCriterion(2)5.7.StrengthRatiosHanyanguniversityS

3、tructures&CompositesLaboratoryChap5.Strenthofcompositematerials-1■Whyfailurecriterion?Needtodecidewhetherastructurefailsornot.Themostimportantstepinadesignprocedure.HelpsdeterminethedimensionsandchoosematerialsAbasisforcomplicatedplasticdeformation.Obtainasafetyfact

4、or(strengthratio)whichsimplifyallthecomplicatedanalysessuchasdynamicandtimedependentbehaviorandunknownpossibilities.HanyanguniversityStructures&CompositesLaboratoryChap5.Strenthofcompositematerials-1Failurecriterionforisotropicmaterialsisrelativelystraight-forwardbe

5、causeisotropicmaterialshavenopreferentialorientationandusuallyonestrengthconstantwillsuffice.Ifthere'snohardeningeffectintheisotropicmaterial,compressiveandtensilestrengthsareequal.■ForIsotropicmaterialss1s2s3evM=const.HanyanguniversityStructures&CompositesLaborator

6、yChap5.Strenthofcompositematerials-1Reviewoffailurecriteriaforisotropicmaterials(Tm=Cm)s1s2VonMisesFailureCriterionCm(compressivestrength)Tm(tensilestrength)TrescaFailureCriterions1s2Inthe2-DInthe3-DHanyanguniversityStructures&CompositesLaboratoryChap5.Strenthofcomp

7、ositematerials-1Reviewoffailurecriteriaforisotropicmaterials(Tm

8、ryChap5.Strenthofcompositematerials-1■ForcompositematerialsForcompositematerials,Thedeterminationofstrengthusingfailurecriteriaisbasedonth