Fracture, Fatigue, Failure and Damage Evolution, Volume 7

Preface	5
Contents	6
1 Interface Mechanical Strength and Elastic Constants Calculations via Nano Impact and Nanomechanical Raman Spectroscopy	8
References	11
2 Effect of Strain Rate and Interface Chemistry on Failure in Energetic Materials	13
References	17
3 Characterization of Crack Tip Plasticity in IN-617 Using Indentation and Nano-Mechanical Raman Spectroscopy	19
References	24
4 The Two-Way Relationship Between Residual Stress and Fatigue/Fracture	25
4.1 Residual Stress Influence on Fatigue and Fracture and Properties	25
4.2 Influence of Fracture Concepts on Residual Stress Measurement	26
References	28
5 Designing Brittle Fracture Specimens to Investigate Environmentally Assisted Crack Growth	30
5.1 Introduction	30
5.2 Finite Element Model	31
5.3 FE Model Validation	33
5.4 Bi-material Beam Finite Element Model	33
5.5 Steady State Cracking in Schott B/Soda-Lime Glass Rectangular Bimaterial Beam	35
5.6 Geometry Design for non-constant SIF	36
5.7 Conclusion	38
References	38
6 Flexible Energy Harvesting/Storage Structures for Flapping Wing Air Vehicles	39
6.1 Introduction	39
6.2 Multifunctional Materials Research Related to Flexible Wings for FWAVS	40
6.2.1 Integration of Power Systems into Morphing Wings	40
6.2.2 System Model for Multifunctional Wings in FWAVs	41
6.2.3 Multifunctional System Analysis for Design Optimization	44
6.3 Experimental Results for Multifunctional Wings	44
6.3.1 Effects of Integrating Power Elements into Wings on System Model Predictions	44
6.3.2 Predicted Effects from Integrating Flexible Solar Cells and Batteriesinto Wings for FWAVs	45
6.4 Conclusions	47
References	48
7 The Influence of Formulation Variation and Thermal Boundary Conditions on the Near-Resonant Thermomechanics of Mock Explosives	50
7.1 Introduction	50
7.2 Experimental Techniques	51
7.2.1 Sample Preparation	51
7.2.2 Experimental Setup	52
7.3 Results and Discussion	54
7.3.1 Experimental Results	54
7.3.1.1 Mechanical Response	54
7.3.1.2 Thermal Response	55
7.3.2 Thermal Simulation	56
7.4 Conclusions	57
References	58
8 Detecting Fatigue Crack Closure and Crack Growth Delays After an Overload Using DIC Measurements	59
8.1 Introduction	59
8.2 Experimental Details	60
8.3 Results and Discussion	61
8.4 Conclusion	66
References	66
9 In-Situ Observation of Damage Evolution in Quasi-Isotropic CFRP Laminates	68
9.1 Introduction	68
9.2 Specimen Preparation	69
9.3 Test Setup	69
9.4 Results and Discussion	70
9.4.1 Global Response	70
9.4.2 Gradual Development of Damages	70
9.4.3 Interlaminar Shear Strain	72
9.5 Summary	73
References	73
10 Contamination-Induced Degradation/Enhancement of Interfacial Toughness and Strength in Polymer-Matrix Composite Interfaces	74
10.1 Introduction	74
10.2 Experimental Framework	75
10.3 Results	75
10.4 Conclusions	78
References	78
11 Direct and Simultaneous Extraction of Mixed-Mode Traction-Separation Relations	80
11.1 Introduction	80
11.2 Experiments	80
11.3 Analysis and Results	82
11.4 Conclusions	85
References	85
12 Damage Evolution in 304L Stainless Steel Partial Penetration Laser Welds	86
12.1 Introduction	86
12.2 Methodology	87
12.3 Results	88
12.4 Discussion and Future Work	93
12.5 Summary	93
References	94
13 Cross-Axis Coupling and Phase Angle Effects Due to Multiaxial Vibration	95
References	97
14 Behavior of Steel-Concrete Composite Beams Under Fatigue Loads	98
14.1 Introduction	98
14.2 Numerical Model	99
14.2.1 Element Selection	99
14.2.2 Material Modeling	99
14.3 Numerical Model Validation	100
14.4 Transformed Section Method	100
14.4.1 Residual Deformation	102
14.4.2 Reduced Static Strength	105
14.5 Effect of External PT	106
14.6 Damage Accumulation Model	106
14.7 Conclusion	107
References	107
15 Studying the Fracture of Tropical Wood Species with the Grid Method	109
15.1 Extended Abstract	109
References	111
16 Generalization of Integral Parameters to Fatigue Loading in Room Temperature	112
16.1 Introduction	112
16.2 Experimental Results	113
16.3 M-Integral Formulation and Finite Element Implementation	113
16.4 Fatigue Crack Growth Life Prediction	115
16.5 Conclusions	116
References	116
17 Fracture Behavior of Unidirectional Composites Analyzed by Acoustic Emissions Technique	117
17.1 Introduction	117
17.2 Materials and Methods	118
17.3 Results and Discussion	120
17.4 Conclusion	121
References	123

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