Interface of Ceramic-Matrix Composites: Design, Characterization, and Damage Effects

219 Pages·2020·9.985 MB·English

by  Longbiao Li

InterfacesofCeramic-MatrixComposites

Interfaces of Ceramic-Matrix Composites
Design,CharacterizationandDamageEffects
LongbiaoLi
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vii
Contents
Preface xi
Acknowledgments xiii
1 Definition,Function,andDesignofInterfaceinCeramic-Matrix
Composites 1
1.1 Introduction 1
1.2 TheDefinitionofInterfaceinCeramic-MatrixComposites 2
1.2.1 Non-oxideCMCs 3
1.2.2 Oxide/OxideCMCs 13
1.3 TheFunctionofInterfaceinCeramic-MatrixComposites 18
1.3.1 EffectofInterphaseonSlidingResistance 19
1.3.2 EffectofInterphaseonThermalMisfitStress 19
1.4 TheDesignofInterfaceinCeramic-MatrixComposites 20
1.4.1 PyCInterphase 20
1.4.2 BNInterphase 21
1.5 Conclusion 21
References 22
2 InterfaceCharacterizationofCeramic-MatrixComposites 29
2.1 Introduction 29
2.2 EffectofInterfacePropertiesonTensileandFatigueBehaviorof
Ceramic-MatrixComposites 30
2.2.1 TheoreticalAnalysis 31
2.2.1.1 FirstMatrixCrackingStress 31
2.2.1.2 MatrixCrackingDensity 31
2.2.1.3 FatigueHysteresis-BasedDamageParameters 32
2.2.2 ResultsandDiscussion 33
2.2.2.1 EffectoftheInterfacePropertiesonFirstMatrixCrackingStress 33
2.2.2.2 EffectoftheInterfacePropertiesonMatrixCrackingDensity 36
2.2.2.3 EffectoftheInterfacePropertiesontheFatigueHysteresis-Based
DamageParameters 39
2.2.3 ExperimentalComparisons 41
2.2.3.1 FirstMatrixCrackingStress 42
2.2.3.2 MatrixCrackingDensity 43
viii Contents
2.2.3.3 FatigueHysteresis-BasedDamageParameters 46
2.3 EffectofPre-exposureonTensileDamageandFractureof
Ceramic-MatrixComposites 51
2.3.1 TheoreticalAnalysis 52
2.3.1.1 StressAnalysisConsideringInterfaceOxidationandFiberFailure 54
2.3.1.2 MatrixMulticrackingConsideringInterfaceOxidation 56
2.3.1.3 InterfaceDebondingConsideringInterfaceOxidation 57
2.3.1.4 FiberFailureConsideringInterfaceandFiberOxidation 58
2.3.1.5 TensileStress–StrainCurvesConsideringEffectofPre-exposure 59
2.3.2 ResultsandDiscussion 60
2.3.2.1 EffectofPre-exposureTemperatureonTensileandDamage
Process 60
2.3.2.2 EffectofPre-exposureTimeonTensileandDamageProcesses 61
2.3.2.3 EffectofInterfaceShearStressonTensileandDamageProcesses 62
2.3.2.4 EffectofFiberStrengthonTensileandDamageProcesses 64
2.3.2.5 EffectofFiberWeibullModulusonTensileandDamageProcesses 65
2.3.3 ExperimentalComparisons 66
2.4 EffectofInterfacePropertiesonLifetimeofCeramic-Matrix
Composites 71
2.4.1 TheoreticalAnalysis 73
2.4.1.1 LifePredictionModelatRoomTemperature 74
2.4.1.2 LifePredictionModelatElevatedTemperaturesintheOxidative
Environment 77
2.4.2 ExperimentalComparisons 79
2.4.2.1 LifePredictionatRoomTemperature 79
2.4.2.2 LifePredictionatElevatedTemperature 89
2.5 Conclusion 100
References 103
3 InterfaceAssessmentofCeramic-MatrixComposites 109
3.1 Introduction 109
3.2 RelationshipsBetweenInterfaceSlipandTemperatureRisingin
CMCs 112
3.2.1 HysteresisTheories 112
3.2.1.1 CaseI 113
3.2.1.2 CaseII 115
3.2.1.3 CaseIII 116
3.2.1.4 CaseIV 117
3.2.2 ExperimentalComparisons 118
3.2.2.1 UnidirectionalCMCs 118
3.2.2.2 Cross-PlyCMCs 122
3.2.2.3 2DCMCs 124
3.3 InterfaceAssessmentofCMCsfromHysteresisLoops 127
3.3.1 ResultsandDiscussion 128
3.3.1.1 UnidirectionalC/SiCComposite 129
3.3.1.2 Cross-PlyC/SiCComposite 131
3.3.1.3 2.5DC/SiCComposite 135