Mechanics and mechanisms of fracture of therm

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1、MechanicsandMechanismsofFractureofThermosettingEpoxyPolymersA.J.KinlochImperialCollegeofScienceandTechnology;DepartmentofMechanicalEngineering;ExhibitionRoad;London,SW72BX/U.K.Thermosettingepoxypolymersarewidelyemployedinstructuralengineeringapplicationsandthusa

2、knowledgeofthemechanicsandmechanismsofthefractureofsuchmaterialsisofvitalimportance.ThepresentChapterdiscussesthefractureofepoxypolymers,concentratingontheuseofacontimeumfracturemechanicsapproachforelucidatingthemicromechanismsofcrackgrowthandidentifyingpertinen

3、tfailurecriteria.ListofSymbols............................46IIntroduction.............................472FractureMechanics.........................473FailureMechanisms.........................483.1ExperimentalTechniques.....................483.2TypesofCrackGrowt

4、h.....................493.3EffectofComposition......................513.4EffectofTestRateandTemperature................523.5CrackTipMicromechanisms..................574Crack-Tip-Blunting..........................604.1CrackOpeningDisplacement....................6

5、04.2RelationbetweenFractureandYieldBehaviour...........614.3FailureCriterion........................635ConcludingRemarks.........................666References.............................6646A.J.KinlochListofSymbolsacracklengthaTtime-temperatureshiftfactorbspeci

6、menthicknessbnspecimenthicknessinplaneofcrackCcriticaldistancesaheadofcrackeyyieldstrainkgeometryconstantlengthofmomentarmmconstantrdistance(polarcoordinate)t~time-to-failurevfvolumefractionwspecimenwidthrateofextensionC*constantEYoung'smodulusAEactivationenergy

7、GlcmodeIfractureenergyGIcsminimumvalueofG~cKlcmodeIstress-intensityfactorattheonsetofcrackgrowthKlcs"sharpcrack"valueofKl¢P~appliedloadatonsetofcrackgrowthRmolargasconstantTtemperatureZgglass-transitiontemperature8tccrack-openingdisplacementatcrackgrowthvPoisson

8、'sratioQcracktipatcrackgrowthstress~oappliedstress(~tccriticalstressatacracktipt~ytuniaxialtensileyieldstressBDMAbenzyldimethylamineCTBNcarboxyl-terminatedbutadiene-a