THEORY AND USES OF ACOUSTIC EMISSIONS -- THEORY AND USES OF ACOUSTIC EMISSIONS -- CONTENTS -- PREFACE -- OPTICAL FIBRE SENSORS FOR ACOUSTIC EMISSION WAVES DETECTION IN COMPOSITES -- ABSTRACT -- 1. INTRODUCTION -- 2. ACOUSTIC EMISSION -- 3. DAMAGE IN COMPOSITES -- 4. ACOUSTIC EMISSION IN COMPOSITES -- 5. OPTICAL FIBRE -- 6. ACOUSTIC EMISSION OPTICAL FIBRE SENSORS -- 6.1. Acoustic Emission Sensing Using Optical Fibre Interferometers -- 6.1.1. Mach-Zehnder interferometer -- 6.1.2. Sagnac Interferometer -- 6.1.3. Michelson Interferometer -- 6.1.4. Fabry-Pérot Interferometer -- 6.2. Acoustic Emission Sensing Using Fibre Bragg Gratings -- 6.3. Acoustic Emission Sensing Using other Types of Optical Fibre Sensors -- CONCLUDING REMARKS -- ACKNOWLEDGMENT -- REFERENCES -- ACOUSTIC EMISSION INDUCED IN ROCKS BY VARIOUS STIMULI -- ABSTRACT -- 1. INTRODUCTION -- 2. ACOUSTIC EMISSION GENERATED IN ROCKS UNDER STRESS -- 2.1. Acoustic Emission in Rocks Subjected to Uniaxial Compression -- 2.2. Acoustic Emission and Electrical Resistivity Changes in Coal under Compression -- 3. ACOUSTIC EMISSION DURING THE MOVEMENT OF WATER OR GAS IN ROCKS: RELATIONSHIP BETWEEN AE AND CHANGESIN PERMEABILITY -- 3.1. Acoustic Emission Generated in Coal by the Flow of Water -- 3.2. Acoustic Emission Induced in Rocks by Flow of a Gas -- 4. ACOUSTIC EMISSION GENERATED IN COAL BY SORPTION/DESORPTION OF GAS -- REFERENCES -- DEFECT DENSITY AND STRENGTH ESTIMATION OF ADHESIVELY BONDED COUPLINGS BY APPLYING THE ACOUSTIC EMISSION TECHNIQUE -- ABSTRACT -- NOTATION -- 1. INTRODUCTION -- 2. METHOD -- 2.1. Specimen Setting up Cycle -- 2.2. Tests Run -- 3. RESULTS -- CONCLUSION -- REFERENCES -- CHARACTERIZATION OF A NICOCRALY TYPE METALLIC BOND COAT USED IN TURBINE BLADE MADE OF AE-437A NI BASE SUPERALLOY -- ABSTRACT -- 1. INTRODUCTION -- 2. EXPERIMENTAL -- 2.1. Generation of TBCs.

2.2. Metallography -- 2.3. Measurement of Residual Stress -- 2.4. Hardness Measurement on Bond Coat -- 2.5. Tensile Test -- 2.6. Shear Test -- 3. FINITE ELEMENT ANALYSIS -- 4. RESULTS AND DISCUSSION -- CONCLUSION -- ACKNOWLEDGMENT -- REFERENCES -- STRUCTURAL HEALTH MONITORING OF SHIP AND OTHER OFFSHORE STRUCTURES USING ACOUSTIC EMISSION TESTING -- ABSTRACT -- INTRODUCTION -- DAMAGE MODES IN SHIP HULL STRUCTURES -- NON DESTRUCTIVE TESTING IN SHIP STRUCTURES -- THE ACOUSTIC EMISSION METHOD IN OFFSHORE STRUCTURES -- REFERENCES -- ACOUSTIC EMISSION SIGNAL CLASSIFICATION USING NATURE INSPIRED TECHNIQUES -- Abstract -- 1.Introduction -- 2.AcousticEmissionSignal -- 2.1.DataCollection -- 2.1.1.SelectionofTrainingPatterns -- 2.2.ClassificationEfficiency -- 3.PatternClassificationMethods -- 3.1.MultilayerPerceptronNeuralNetwork -- 3.2.PCA-kmeans -- 4.NatureInspiredTechniquesforPatternClassification -- 4.1.ArtificialBeeColony -- 4.1.1.ABCforMulti-LayerPerceptronNeuralNetwork -- 4.1.2.RiskSensitiveHingeLossFunction -- 4.1.3.EstimationofRiskFactormkj -- 4.1.4.ABCSimulationandClassification -- 4.2.Ant-Miner -- 4.2.1.RuleConstruction -- 4.2.2.RulePruning -- 4.2.3.PheromoneUpdation -- 4.2.4.Ant-Miner'sParameterSetting -- 4.2.5.Ant-MinerSimulationandClassification -- 4.3.GeneticProgramming -- 4.3.1.GPBasedTwo-ClassPatternClassificationProblem -- 4.3.2.GPBasedMulti-classPatternClassificationProblem -- 4.3.3.GeneticProgrammingSimulationandClassification -- 4.4.ArtificialImmuneSystem -- 4.4.1.TheImmuneSystem -- 4.4.2.TheaiNetAlgorithm -- 4.4.3.AISSimulationandClassification -- 4.5.SelfOrganizingMap -- 4.5.1.CompetitionPhase -- 4.5.2.UpdationPhase -- 4.5.3.LearninginSOM -- 4.5.4.SOMSimulationandClassification -- 5.ComparativeStudy -- 6.ConclusionsandOutlook -- References -- SYMMETRY AND ENTROPY OF ACOUSTIC-EMISSION PATTERNS IN A ROCK-FRACTURE EXPERIMENT -- Abstract.

1.INTRODUCTION -- 2.DATA -- 3.Method -- 3.1.Walshfunctions -- 3.2.DiscreteWalshfunctions -- 4.SymmetryofAEpatterns -- 4.1.SymmetropyofAEpatterns -- 4.2.PartialsymmetropyofAEpatterns -- 4.3.TsallissymmetropyofAEpatterns -- 5.EntropyofAEpatterns -- 6.ALGEBRAICAPPROACH -- 6.1.OrdersetandHassediagram -- 6.2.Symmetropyoflattice(SOL) -- 6.3.SOLofAEpatterns -- 7.RANDOMPATTERNSINDISCRETESPACE -- 8.CONCLUSION -- References -- ACOUSTIC EMISSION FOR LOW VELOCITY IMPACT DAMAGE CHARACTERISATION ON POLYMER COMPOSITES -- INTRODUCTION -- WAVELET DECOMPOSITION OF AE SIGNALS -- ACOUSTIC EMISSION MONITORING OF IMPACT DAMAGE -- Real Time Monitoring of Impact Damage -- Quasi-Static Indentation Loading -- Post-Impact Tests Monitoring -- CONCLUSION -- REFERENCES -- QUALITATIVE ACOUSTIC EMISSION INDICES FOR CHARACTERIZATION OF CONCRETE DAMAGE STATUS -- ABSTRACT -- 1. INTRODUCTION -- 2. AE Indices -- 2.1. AE Parameters -- 2.2. Crack Mode Classification -- 2.3. Classification Problems -- 3. BENDING OF STEEL FIBER REINFORCED CONCRETE -- 3.1. Experimental Details -- 3.2. AE Behavior of Concrete Under Bending -- 3.3. Classification of Cracks -- 4. CONFIRMATION OF THE CRACK CLASSIFICATION BY THE MOMENT TENSOR ANALYSIS IN BRAZILIAN TEST -- 4.1. Scope -- 4.2. Experiment -- 4.3. AE-SiGMA Analysis -- 4.4. Results and Discussion -- 5. SENSOR RESPONSE -- CONCLUSION -- ACKNOWLEDGMENT -- REFERENCES -- AE FAILURE CHARACTERIZATION OF ADVANCED COMPOSITES USING PIEZO-ELECTRIC SENSORS AND FIBRE OPTIC SENSORS -- INTRODUCTION -- 1. NON-DESTRUCTIVE COMPOSITE EVALUATION -- 1.1. Types of NDE -- 1.2. Acoustic Emission -- 1.2.1. Acoustic-Emission Analysis -- 1.2.2. Ae Sensors -- 1.2.3. AE Data Analysis -- 1.2.4. Parametric or Feature Set Analysis -- 1.2.5. Transient or Modal Analysis or Waveform Digitisation -- 1.2.6. Summary of AE -- 1.3. Optical-Fibre Sensing -- 1.3.1. Basic Principles.

1.3.2 Optical-fibre Modulation Techniques -- 1.3.3. Bragg Grating Sensors -- 1.3.4. Multiplexing -- 1.3.5. FBG Interrogation -- 1.4. Acoustic Emission Measurement with Fibre-Optic Sensors -- 1.4.1. Interferometric Acoustic Sensors -- 1.4.2. Intensity-Type Acoustic Sensor -- 2. CURVED COMPOSITES -- 2.1. Effects of Embedded Optical Fibres on Structural Integrity -- 2.2. Out-Of-Plane Joints -- 2.2.1 T- Joints -- 3. TOP-HAT STIFFENER -- 3.1. Hand-Laid Top-Hat Stiffener -- 3.1.1. Experimental Test Configuration -- 4.4.3. Hand Laid Top-Hat Stiffener Experimental Results -- 4. AE INTERROGATION OF COMPOSITE FAILURES -- 4.1. Parametric Analysis -- 4.2. Transient Analysis -- 4.3. AE Instrumentation and Setup -- 4.3.1. Data Collection -- 4.4. Ae Failure Characterisation -- 4.4.1. Hand-Laid Top-Hat Stiffener AE Failure Characterisation -- 4.5. VIP Manufacturing Process -- 4.5.1. VIP Top-Hat Stiffener Results -- 5. AE DETECTION WITH FIBRE BRAGG GRATINGS -- 5.1. Phase-Shifted Fibre Bragg Grating AE Measurement System -- 5.1.1. Pencil Lead Break Test -- 5.1.2. Deployment of the PS-FBG Sensor in Continuous Monitoring of Composite Failures -- 5.1.3. FBG Characterisation -- 6. VIP TOP-HAT STIFFENER AE FAILURE CHARACTERISATION -- 6.1. Setup for VIP Top-hat Stiffener AE Testing -- 6.1.1. VIP Top Hat Stiffener - Parametric Analysis -- 6.2. VIP Top Hat Stiffener Parametric Analysis-FBG-AE Sensor -- 6.3. VIP TOP HAT STIFFENER WAVEFORM FAILURE CHARACTERISATION FOR PIEZOELECTRIC AND FBG-AE SENSOR -- CONCLUSION -- REFERENCES -- INDEX.