Proceedings of the 13th International Conference on Damage Assessment of Structures

Name: Proceedings of the 13th International Conference on Damage Assessment of Structures | DAMAS 2019, 9-10 July 2019, Porto, Portugal
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DAMAS 2019, 9-10 July 2019, Porto, Portugal

Magd Abdel Wahab(Herausgeber*in)

Springer (Verlag)

Erschienen am 4. Juli 2019

XVI, 947 Seiten

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Inhalt

Intro
Preface
Organising Committee
Chairman
International Organisation Committee
International Scientific Committee
Contents
Structural Health and Condition Monitoring
Machine Learning Techniques for Structural Health Monitoring
Abstract
1 Introduction
2 Literature Review
2.1 Structural Health Monitoring
2.2 Damage Detection Techniques
2.3 SHM Methods in Civil Structures
2.4 Time Series Analysis
2.5 Machine Learning Approach in SHM
2.6 Existing Machine Learning Methodologies
3 Methodology
3.1 Experimental Setup at LANL [10]
3.2 Steps in Conducting the Test
3.3 Supervised ML Algorithms Used
3.4 Experimental Evaluation and Implementation of ML in Structural Health Monitoring
3.5 Training Data Set Preparation
3.6 Training and Applying ML
4 Results and Discussion
4.1 Confusion Matrix
4.2 Classification Reports
4.3 Results Interpretation
5 Summary and Conclusion
References
Bridge Monitoring Using Geophones: Test and Comparison with Interferometric Radar
Abstract
1 Introduction
2 The Geophone Sensor
3 The Amerigo Vespucci Bridge, Florence, Italy
4 Experimental Results
4.1 Test in Controlled Environment
4.2 In-Field Test: Vespucci Bridge, Florence, Italy
5 Conclusions
References
A Damage Detection Method by Transient Damping Feature Based on Monitoring Data
Abstract
1 Introduction
2 FSWT Analysis Tool and Applications
3 Modal Transient Damping Feature Analysis and Feature Extract Algorithm
3.1 FSWT Envelope Analysis
3.2 Damping Feature Extract Algorithm
4 Damage Detection Results and Discussions
5 Conclusions
References
Finite Element Modelling and Damage Detection of Seam Weld
Abstract
1 Introduction
2 Seam Welded Joint Modelling
3 Basic Theory
3.1 Model Updating Method
3.2 Kriging Surrogate Model
4 Numerical Simulation
5 Conclusions
Acknowledgements
References
Detection of Multiple Cracks Using an Energy Method Applied to the Concept of Equivalent Healthy Beam
Abstract
1 Introduction
2 The EHB Model and Its Use in Predicting Frequency Changes
3 Numerical Simulation
3.1 Validation of the EHB Concept
3.2 Validation of the ML-EHB Model
3.3 Application of the Superposition Principle
4 Discussion on the Superposition Principle
5 Conclusion
References
Study Regarding the Effect of Crack Branching on the Eigenfrequencies of Beams
Abstract
1 Introduction
2 Materials and Methods
2.1 The Beam Used for FEM Simulation
2.2 The Branched Crack
2.3 Theoretical Background and the Test Procedure
3 Results and Discussion
4 Conclusion
References
The Application of Spatial Filtration for Damage Detection in Structures with Multiple Poles
Abstract
1 Introduction
2 Goal of the Research
3 Simulation Model
4 Obtained Results
4.1 Results for the System with Triple Pole
4.2 Analysis of Required Pole Distance in the Frequency Domain
5 Summary
Acknowledgement
References
Experimental Validation of Damage Indices Based on Complex Modes for Damage Detection in Vibrating Structures
Abstract
1 Introduction
2 Relation Between Structural Damage and Modal Complexity
3 Damage Indices Based on Modal Complexity
3.1 Unmeasurable Indices
3.2 Measurable Indices
3.2.1 Complex Mode Shapes Rotation
4 Case Study and Methodology
4.1 The Structural Model
4.2 Dynamic Tests
4.3 Damage Index
4.4 Complex Mode Shapes Identification
4.4.1 Identification Procedure
4.4.2 Identified Complex Mode Shapes
5 Results
5.1 Damage Detection
5.2 Damage Index Sensitivity
5.3 Damage Index Stability
5.4 Damage Index Repeatability
6 Conclusions
Acknowledgements
References
Application of Modulation Transfer Effect to Damage Detection
Abstract
1 Introduction
2 Modulation Transfer
3 Nonlinear Dissipation Energy Models
3.1 Quadratic Damping
3.2 Hysteresis Stiffness
3.3 Quadratic Damping with Frequency Dependent Component
4 Model Comparison
5 Experimental Verification
6 Conclusions
Acknowledgement
References
Application of Wavelet Analysis for Crack Localization and Quantification in Beams Using Static Deflections
1 Introduction
2 Continuous Wavelet Analysis
3 Static Based Crack Identification Problem
3.1 Damage Locating Index
3.2 Damage Severity Index
3.3 Numerical Example
4 Experimental Tests
4.1 Noise Filtering
4.2 Crack Localization Results
4.3 Crack Quantification Results
5 Conclusion
References
Using Enhanced Cepstral Analysis for Structural Health Monitoring
Abstract
1 Introduction
2 Theoretical Background
2.1 Cepstrum, Mel-Scale and Mel-Frequency Cepstral Coefficients
3 Case Study
3.1 Finite Element Model
3.2 Damage Scenarios
3.3 Seismic Parameters and Input Definition
4 Damage Detection Algorithm
4.1 Signal Pre-processing
5 Results
5.1 Baseline and Level-Uniform Damage Cases
5.2 Realistic Damage Cases
5.3 Cases with Small Fluctuations from the Baseline
6 Conclusions
Acknowledgments
References
Operational Modal Analysis of Y25 Bogie via Stochastic Subspace Identification for the Condition Monitoring of Primary Suspension Systems
Abstract
1 Introduction
2 ACS-SSI Algorithm
3 Test Rig and Theoretical Modal Parameters
3.1 Test Rig Introduction and Experiment Setup
3.2 Theoretical Modal Analysis
4 Experiment Results and Discussion
4.1 Raw Signal Characteristics
4.2 Modal Parameters Identified by ACS-SSI
5 Conclusions
Acknowledgment
References
A Comparative Study on Data Manipulation in PCA-Based Structural Health Monitoring Systems for Removing Environmental and Operational Variations
Abstract
1 Introduction
2 Methodology
2.1 Data Pre-processing
2.2 Feature Extraction
2.3 Damage Detection
3 Case Studies
3.1 Simulated System
3.2 Wind Turbine Data
4 Results and Discussion
4.1 Simulated System
4.2 Wind Turbine Data
5 Conclusion
Acknowledgements
References
Damage Localisation in Thin Plates Using the Inverse Finite Element Method
Abstract
1 Introduction
2 The Inverse Finite Element Method
2.1 Plate Formulation
3 Damage Localisation Strategy
3.1 Discretisation of the Structure
3.2 Condition for Damage Prediction
4 Numerical Examples
4.1 Test Cases
4.2 Results
5 Conclusions
References
Damage Localization and Quantification in Structures Using Residual Force Indicator
Abstract
1 Introduction
2 The Residual Force Method (RFM)
3 Modal Strain Energy Change Ratio Indicator
4 Numerical Examples
4.1 Simply Supported Beam
4.2 25 Bar Plane Truss
4.3 3D Frame Structure
5 Conclusion
References
Damage Detection in Truss Structures Using Transmissibility Combined with Optimization Techniques
Abstract
1 Introduction
2 The Transmissibility Concept
2.1 Objective Function
3 Particle Swarm Optimization (PSO)
4 Numerical Examples
4.1 A 25-Bar Plane Truss
4.2 Damage Scenario 1 (D1)
4.3 Damage Scenario 2 (D2)
4.4 Damage Scenario 3 (D3)
5 Conclusion
References
Bolted Joint Monitoring Using the Elastic Wave Propagation
Abstract
1 Introduction
2 Theoretical Background
3 Experimental Study
3.1 Scope of Research
3.2 The Results and Discussion
4 Conclusion
References
A Generic Framework for Application of Machine Learning in Acoustic Emission-Based Damage Identification
1 Introduction
2 Acoustic Emission Source Location
3 Important Signal Characteristics for Damage Identification
3.1 Compressed Cross-Correlation Signal Features for AE
3.2 Discrete Scale-Time Decomposition of Cross-Correlation
4 Gaussian Process Regression with Signal Features
5 Experimental Setup
5.1 Sample Details
5.2 Panel Instrumentation
5.3 Data Acquisition
6 Results and Discussion
7 Conclusion and Future Work
References
Selection of Small Sensor Arrays for Localization of Damage in Complex Assemblies Using Vibro-Acoustic Signals
1 Introduction
2 Time-Reversal MUSIC
3 Selection Algorithm for Sensor Array
4 Numerical Verification
5 Experimental Validation
6 Conclusion
References
Efficient Algorithm for Frequency Estimation Used in Structural Damage Detection
Abstract
1 Introduction
2 Review of the Main Actual Interpolation Methods
2.1 Discrete Fourier Transform
2.2 Determining the Precision of the Main Actual Interpolation Methods
3 The Proposed Frequency Estimation Method
3.1 Description of the Propose Frequency Estimation Method
3.2 Numerical Tests to Validate the Precision of the Frequency Estimation
3.3 Recommendation
4 Conclusion
References
Damage in Civil Engineering
Modal Property Extraction Based on Frequency Domain Stochastic Subspace Identification
Abstract
1 Introduction
2 Methodology
2.1 Refined Frequency Domain Decomposition (rFDD)
2.2 Peak-Picking Process
2.3 Frequency-Domain Stochastic Subspace System Identification (SSI)
3 Numerical Example
4 Conclusions
Acknowledgement
References
Damage Assessment of a Cloister Vault
Abstract
1 Introduction
2 The Bussi Castle
3 Crack Pattern
4 Experimental Tests
4.1 Modal Parameters Identification
5 Numerical Model
6 Numerical - Experimental Comparison
6.1 Check of Damage Presence
6.2 Damage Evaluation
7 Conclusion
References
Ensemble Technique for Machine Learning with Application to Monitoring of Heritage Structures
Abstract
1 Introduction
2 Cointegration
2.1 Theory of Cointegration
2.2 The Augmented Dickey-Fuller (ADF) Test
2.3 Regression Models: Machine Learners and Kernel Function
2.3.1 SVM
2.3.2 RVM
3 The Plackett-Luce Model
4 Case Study: The Sanctuary of Vicoforte
4.1 Application of the Plackett-Luce Model
5 Conclusion
Acknowledgments
References
Sensitivity to Damage of the Forced Frequencies of a Simply Supported Beam Subjected to a Moving Quarter-Car
Abstract
1 Introduction
2 Bridge and Vehicle Models
3 Eigenvalue Analysis of Coupled Bridge and Vehicle Models
4 Comparison of Relative Changes in Frequency
5 Conclusions
Acknowledgements
References
Physical and Virtual Implementation of Closed-Loop Designs for Model Updating
1 Introduction
2 Output Feedback
3 Model Updating Using Closed-Loop Systems
4 Numerical Examples
4.1 10-DOF Shear Building
4.2 Plate Model
5 Conclusion
References
On Gain Design in Virtual Output Feedback for Model Updating
1 Introduction
2 Output Feedback
2.1 Virtual Implementation
2.2 Pole and Eigenvector Placement
3 Gain Design
4 Model Updating Formulation
5 Numerical Examination
6 Conclusion
References
Damage Assessment in Beam-Like Structures Using Cuckoo Search Algorithm and Experimentally Measured Data
Abstract
1 Introduction
2 Cuckoo Search Algorithm
3 Finite Element Model and Experimental Validation
4 Conclusion
Acknowledgments
References
State Evaluation of Centrifugal Compressor Unit Based on Parameter Distribution
Abstract
1 Introduction
2 The Analysis Method Based on FMEA/AHP
2.1 The Improvement of FMEA Analysis Method
2.2 The AHP Analysis Method
3 Distribution Model
3.1 Logic Regression Model
3.2 Gaussian Model
4 Evaluation Example
4.1 Construction of State Evaluation Index
4.2 Calculation of Parameter Distribution Model
4.3 Evaluation Results
5 Conclusion
Acknowledgements
References
Crack Identification in Multi-Span Beams on Elastic Foundation by Using Transfer Matrix Method
Abstract
1 Introduction
2 Model and Formulation
3 Transfer Matrix Formulations
4 Numerical Case Study
5 Conclusions
References
Non Destructive Inspection of Corrosion in Rock Bolts Using an Ultrasonic Waveguide Approach
Abstract
1 Introduction
2 Wave Propagation Characteristics
2.1 Reflection Characteristics
2.2 Ultrasonic Propagation Mode
2.3 Wave "Energy" Propagation
2.4 Wave Attenuation in Rock Anchor Bolt
3 Experimental Set-up
4 Wave Energy Propagation Model for the Prediction of Defects
4.1 Wave Energy Propagation
4.2 Wave Energy Attenuation
4.3 Guided Wave Energy Propagation Model
5 Prediction of Section Reduction
6 Prediction of Length of Loss of Contact
7 Differentiating Cracks from Tapered Reductions
8 Differentiating Defect from End of Bolt Reflections
8.1 Coefficient of End Reflection "CRB"
8.2 Evaluating the End Reflection
9 Identification of a "Ghost Defect"
9.1 Effects of a "Ghost Defect"
9.2 Length of Loss of Contact of a "Ghost Defect"
9.3 Procedure to Determine a "Ghost Defect"
10 Inspection and Replacement Criteria
10.1 Allowable Section Reduction
10.2 Sufficient Holding Length of the Steel-Grout Interface
10.3 Defining Acceptable Length of Loss of Contact
11 Discussion
12 Conclusion
References
Effects of Measuring Techniques on the Accuracy of Estimating Cable Tension in a Cable-Stay Bridge
Abstract
1 Introduction
2 Theoretical Methodology of Vibration-Based Method
3 In Situ Measurement of Cable Tension
3.1 Introduction to Kien Bridge
3.2 Field Measurement
4 Numerical Model
4.1 Input Parameters
4.2 Modelling Scenarios
5 Results and Discussion
6 Conclusions
Acknowledgements
References
Finite Element Analysis of Pile Foundations Under Surface Blast Loads
Abstract
1 Introduction
2 Structural and Soil Model
3 Finite Element Model
4 Blast Pressure Loading
5 Results
6 Conclusions
Acknowledgement
References
Recurrence Analysis for Damage Detection and Localization in Beam Structure
Abstract
1 Introduction
2 Applied Methods
2.1 Recurrence Plot (RP)
2.2 Recurrence Quantification Analysis (RQA)
3 Identification Experiment
4 Results of Damage Detection and Localization with the Application of the RP and RQA Methods
5 Conclusions and Final Remarks
Acknowledgments
References
Fault Detection for a Satellite-like Structure Using Sine Sweep Vibration Test Data
Abstract
1 Introduction
2 Theory and Method
2.1 Variational Mode Decomposition
2.2 VMD-Based Fault Detection Indicator
2.3 Area-Based Fault Detection Indicator
2.4 Indicator Combination Based on Dempster-Shafer's (D-S) Evidence Theory
3 Experimental Analysis
3.1 Description of the Specimen
3.2 Experiment Setup
3.3 Result and Discussion
4 Conclusions
Acknowledgement
References
Debonding Detection in Reinforced Concrete Beams with the Use of Guided Wave Propagation
Abstract
1 Introduction
2 Theoretical Background of Wave Propagation in Reinforced Concrete Specimens
2.1 Wave Propagation in Single Waveguide
2.2 Wave Propagation in Concrete Beam
2.3 Wave Propagation in Concrete Beam with and Without Partial Debonding
3 Experimental Investigation
3.1 Beam Model
3.2 Experimental Set up
3.3 Results
4 Conclusions
References
On the Model Order in Parameter Estimation Using Virtual Compensators
1 Introduction
2 Output Feedback
3 Virtual Implementation
4 Fisher Information on the Parameters
5 Model Updating Using Virtual Compensator
6 Numerical Examination
7 Conclusion
References
Smart Acoustic Band Structures
Abstract
1 Introduction
2 Numerical Model
3 Numerical Analysis
4 Experimental Verification
5 Conclusion and Discussion
References
Damage in Machineries
Development of a Novel Solution for Leading Edge Erosion on Offshore Wind Turbine Blades
Abstract
1 Introduction
2 Methodology
2.1 Aim and Objectives
2.2 Methodology Overview
3 Methods and Discussions
3.1 Material Characterization
3.2 Rain Erosion and Mechanical Testing of Materials
3.3 Finite Element Model Development
3.4 Leading Edge Component Design and Manufacture
3.5 Leading Edge Component Mechanical Testing
3.6 Operational Trials
4 Conclusion
Acknowledgements
References
Fault Diagnosis of Shaft Misalignment and Crack in Rotor System Based on MI-CNN
Abstract
1 Introduction
2 Convolutional Neural Network for Fault Diagnosis of Shaft Misalignment and Crack in Rotor System
2.1 Brief Introduction
2.2 Model Design
3 Experimental Verification
3.1 Experimental Setup
3.2 Data Description
3.3 Results and Discussions
4 Conclusions
Acknowledgments
References
Development and Tuning of a Simplified 1D Model for Generation of Transient States in Large Turbomachinery
Abstract
1 Introduction
2 1D Gray-Box Rotor-Bearing Model
2.1 The Rotor Model
2.2 The Bearing Model
2.3 Model Parameters
3 Case Study
3.1 The Shaft-Bearing Line Parameters
3.2 Operational Measurement Data
3.3 Model Parameters
3.4 Model Parameters Adjustment Process
4 Summary
References
Static Strength Analysis of Centrifugal Compressor Balance Plate Based on Finite Element Method
Abstract
1 Introduction
2 Static Finite Element Analysis
3 Static Analysis of Balance Disc
4 Conclusion
Acknowledgements
References
Modulation Signal Bispectrum Analysis of Motor Current Signals for Condition Monitoring of Electromechanical Systems
Abstract
1 Introduction
2 Theoretical Backgrounds
2.1 Modulations in Motor Drives
2.2 Rotor Problem
2.3 Stator Winding Problem
2.4 MSB Analysis
2.5 MSB Coherence
3 Experimental Methods
3.1 Test Systems
3.2 Fault Simulations
3.3 Test Procedure
4 Results and Discussion
4.1 Characteristics of MSB Under BRB and SM
4.2 Characteristics of MSB Under BRB, SRI and SM
5 Conclusions
References
Diagnosis for Timing Gears Noise of a Diesel Generating Set
Abstract
1 Introduction
2 Analysis of the Noise
3 Fault Reasoning Procedure
4 Problem Solved
5 Conclusion
Acknowledgement
Appendix
References
Adaptive Feature Selection for Enhancing Blade Damage Diagnosis on an Operational Wind Turbine
Abstract
1 Introduction
2 Methodology
2.1 Data Collection and Sorting Vibration Measurements
2.2 Covariance Matrix
2.3 Principal Component Analysis
2.4 Mahalanobis Distance
2.5 Probability of Damage and Feedback of New Information
3 Experiment and Data
3.1 Setup and Procedure
3.2 Data and Reference State
4 Results and Discussions
5 Conclusions
References
Condition Monitoring of Wind Turbines Using Adaptive Control Charts
1 Introduction
2 AEWMA Control Charts
3 Feature Selection and Regression Prediction on Fault-Free SCADA Data
4 Condition Monitoring Examples
5 Conclusions
References
A New Intelligent Fault Diagnosis Method and Its Application on Bearings
Abstract
1 Introduction
2 Methodology
2.1 The Difference Between CNN and Traditional Algorithms
2.2 Design of the CNN for Bearing Fault Diagnosis
2.3 Data Augmentation
2.4 Signal-to-Image Conversion Method
3 Verification of Bearing Data Sets
3.1 Data Set Description and Fault Type Definition
3.2 The Influence of Data Size on Training and Fault Identification
3.3 Verification of Anti-Noise Performance
4 Conclusion
Acknowledgements
References
Study on Vibration Tracing and Vibration Reduction Technology of Reciprocating Compressor Pipeline
Abstract
1 Introduction
2 Pipeline Vibration Traceability
3 Design of Dynamic Vibration Absorber
4 Analysis of Vibration Reduction Effect
5 Conclusion
Acknowledgements
References
Research on Motor Fault Warning Technology Based on Second-Order Volterra Series
Abstract
1 Introduction
2 Volterra Series
3 Establishment of Motor Fault Warning Model
4 Application Examples
4.1 Simulation Signal Prediction Example
4.2 Measured Signal Prediction Example
5 Conclusion
Acknowledgements
References
Topological Design of a Rotationally Periodic Wheel Under Multiple Load Cases
Abstract
1 Introduction
2 Optimization Modeling
2.1 Optimization Algorithm
2.2 Stiffness Optimization Under Multiple Load Cases
3 Optimization Results
3.1 Optimized Wheel Structural Topology
3.2 Effect of MMS Control
3.3 Effect of Material Usage
4 Conclusions
Acknowledgements
References
Effect of Loading Conditions in Fretting Fatigue on Wear Characteristics
Abstract
1 Introduction and Background
2 Model Details
3 Results and Discussion
3.1 Wear Profiles with Different Axial Stresses
3.2 Wear Profiles with Different Tangential Loads
3.3 Wear Profiles with Different Normal Loads
4 Conclusion
References
Damage Assessment in Fretting Fatigue Specimens with Micro-voids Using Critical Plane Approach
Abstract
1 Introduction
2 Numerical Model
3 Results and Discussion
4 Conclusions
Acknowledgements
References
Preliminary Evaluation of Functional Coatings for Marine Based Renewable Energy Applications
Abstract
1 Introduction
2 Experimental
2.1 Materials
2.2 Sol-Gel Synthesis
3 Methods
3.1 Pre-treatment of Aluminium Metal
3.2 Coating of the Al Samples
4 Characterisation
4.1 Fourier Transform Infrared-Attenuated Total Reflectance (ATR-FTIR)
4.2 Pencil Hardness Test
4.3 Cross Hatch Adhesion Test
4.4 Thermal Stability Test
4.5 Chemical Stability Test
5 Results and Discussions
5.1 Pre-treatment of Aluminium Metal
5.2 ATR-FTIR
5.3 Pencil Hardness Test
5.4 Cross Hatch Adhesion Test
5.5 Thermal Stability Test
5.6 Chemical Stability Test
6 Conclusions
Acknowledgments
References
An Implementation of Cyclic Cohesive Zone Models in ABAQUS and Its Applicability to Predict Fatigue Lives
Abstract
1 Introduction
2 Theoretical Background and Implementation
2.1 Cyclic Cohesive Zone Models
2.2 ABAQUS Implementation
3 Case Study: Low Cycle Fatigue
4 Conclusions
Acknowledgements
References
A 3S_BN Based Approach for the Quantitative Risk Assessment of Third-Party Damage on Pipelines
Abstract
1 Introduction
2 The 3S_BN Theoretical System
2.1 Safety Barrier
2.2 Scenario Analysis
2.3 Bayesian Network
2.4 Methods of CPT Development
3 The QRA Model for TPD
4 Case Study
4.1 CPT Development
4.2 Description of the Incident and the Analysis of Results
5 Discussion
6 Conclusion and Further Work
Acknowledgements
References
Molecular Dynamics Simulation on Intergranular Crack Propagation Along S3 Tilt Grain Boundary in Bcc Iron
Abstract
1 Introduction
2 Modeling and Simulation
3 Result Analysis
4 Conclusions
Acknowledgements
References
Fatigue Crack Propagation in HSLA Steel Specimens Subjected to Unordered and Ordered Load Spectra
Abstract
1 Introduction
2 Experimental Details
2.1 Materials and Specimen Configuration
2.2 Load Profiles
3 Theoretical Background
3.1 Autocorrelation Function
3.2 Wheeler Model
3.3 Willenborg Model
4 Results and Discussion
5 Conclusions
Acknowledgements
References
Damage Detection in the Wind Turbine Blade Using Root Mean Square and Experimental Modal Parameters
Abstract
1 Introduction
2 Methodology
2.1 Research Object
2.2 RMS Calculation
3 Results and Discussion
4 Conclusions
References
Effects of Freezing-Thawing Cycles on Mechanical Strength of Poly (Vinyl Alcohol) Hydrogels
Abstract
1 Introduction
2 Experiments
2.1 Materials
2.2 Preparation of Macroporous PVA Hydrogels
2.3 Mechanical Test
2.4 Scanning Electron Microscopy (SEM)
3 Result and Discussion
3.1 Effect of Preparation Parameters on Mechanical Properties
3.2 Morphology Characterization
4 Conclusion
Acknowledgments
References
Damage in Composite Materials
Delamination Buckling of FRP: Experimental Tests and Theoretical Model
Abstract
1 Introduction
2 Experimental Tests and Results
2.1 Homogeneous Column Model Under Compression
2.2 Strengthened Homogeneous Column Models
3 Analysis of Delamination Buckling with Analytical Model
4 Conclusion
Acknowledgments
References
Preparation of N-Doped Carbon/Cobalt Ferrite Hybrid Nanocomposites for Lithium Ion Batteries Anodes
Abstract
1 Introduction
2 Experimental
2.1 Synthesis of CFO/C-G and CFO/C-S
2.2 Characterization
3 Results and Discussions
4 Conclusions
Acknowledgements
References
Random Vibration Based Robust Damage Detection for a Composite Aerostructure Under Assembly-Induced Uncertainty
1 Introduction
2 The Experimental Procedure
2.1 The Structure and the Test Rig
2.2 The Damage Scenarios and the Experiments
2.3 Assessment of the Effects of Each Damage Scenario on the Dynamics Under Assembly-Induced Uncertainty
3 The Damage Detection Methods
3.1 Preliminaries
3.2 The U-MM-VARX Method
3.3 The U-PCA-VARX Method
4 Damage Detection Performance Assessment
4.1 Preliminaries
4.2 Damage Detection Performance
5 Concluding Remarks
References
Random Vibration Damage Detection for a Composite Beam Under Varying Non-measurable Conditions: Assessment of Statistical Time Series Robust Methods
1 Introduction
2 The Experimental Set-Up
3 The Statistical Time Series (STS) Type Robust Damage Detection Methods
3.1 The Functional Model (FM) Based Method
3.2 A Multiple Model (MM) Based Method
3.3 A Principal Component Analysis (PCA) Based Method
4 Experimental Assessment of the Methods
4.1 Baseline (Training) Phase
4.2 Inspection (Diagnosis) Phase
5 Concluding Remarks
References
Damage Quantification in Composite Structures Using Autoregressive Models
1 Introduction
2 Quantification Methodology Proposed
2.1 Damage-Sensitive Index Using AR Models
2.2 Trend Curve Extrapolation
3 Experimental Application
4 Final Remarks
References
Meso-Scale Damage Modeling of Hybrid 3D Woven Orthogonal Composites Under Uni-Axial Compression
Abstract
1 Introduction
2 Composite Material and Experimental
3 Methodology
3.1 Geometry of RVE
3.2 Constituent Properties
3.3 Voids Consideration
3.4 FE Model
3.5 Damage Modeling
4 Results and Discussion
5 Conclusion
References
Experimental Study on the Stiffness Evolution and Residual Strength of a Pre-damaged Structural Component Made from SMC CFRP Material
1 Introduction
2 Test Set-Up
3 Experiment Results
3.1 Stiffness and Crack Evolution - Phase 2
3.2 Residual Strength
4 Discussion
4.1 Stiffness Degradation
4.2 Crack Propagation
4.3 Residual Strength and Implications for Post-damage Use
5 Conclusions
References
Delamination Detection via Reconstructed Frequency Response Function of Composite Structures
1 Introduction
2 Methodology
2.1 Experimental Set up
2.2 Excitation Signal
3 Results and Discussions
4 Conclusion
References
Free Vibration of Angle-Ply Laminated Micro-plates Using Isogeometric Analysis and Modified Couple Stress Theory
Abstract
1 Introduction
2 Preliminaries
2.1 New Modified Couple Stress Theory
2.2 Plate Constitutive Relations
3 Numerical Examples
4 Conclusions
Acknowledgements
References
Damage Assessment of Laminated Composite Plates Using a Modified Cornwell Indicator
Abstract
1 Introduction
2 Method Description
2.1 MCI
3 Numerical Examples
3.1 Case 1: Damage Scenario D1
3.2 Case 2: Damage Scenario D2
3.3 Case 3: Damage Scenario D3
3.4 Case 4: Damage Scenario D4
3.5 Case 5: Damage Scenario D5
4 Conclusions
References
The Sensitivity of Modal Strain Energy for Damage Localization in Composite Stratified Beam Structures
Abstract
1 Introduction
2 Damage Indicators
2.1 Modal Strain Energy Indicator
2.2 Modified Modal Strain Energy Indicator
3 Numerical Results and Discussion
3.1 CFRP Cantilever Beam
3.2 A Three Cross-Ply (0°/90°/0°) Rectangular Beam
4 Results and Discussion
4.1 CFRP Cantilever Beam
4.1.1 Damage Scenario 1 (D1)
4.1.2 Damage Scenario 2 (D2)
4.1.3 Damage Scenario 3 (D3)
4.2 A Three Cross-Ply (0°/90°/0°) Rectangular Beam
4.2.1 Damage Scenario 1 (D1)
4.2.2 Damage Scenario 2 (D2)
4.2.3 Damage Scenario 3 (D3)
5 Conclusion
References
A Comparative Study of the Behavior of Glass Fiber-Reinforced Polyester Composite Laminates Under Static Loading
Abstract
1 Introduction
2 Material Characteristics
3 Experimental Conditions
4 Results and Discussion
4.1 Bending Results in Two Directions
4.2 Influence of the Distance Between Supports
4.3 Influence of Type of Folds
5 Observation of Fracture Surfaces Using SEM
6 Conclusions
References
Damage Detection in Laminated Composite Plates Based on Local Frequency Change Ratio Indicator
Abstract
1 Introduction
2 Local Frequency Change Ratio Indicator
3 Results and Discussion
3.1 Numerical Example
3.2 Damage Scenarios
4 Effect of Noise
5 Conclusion
References
The Impact of the Selected Exploitation Factors on the Adhesive Joints Strength
Abstract
1 Introduction
2 Methodology
2.1 Adherend Characteristics
2.2 Adhesive Joints
2.3 Adhesives Characteristics
2.4 Conditions of Making Joints
2.5 Description of the Ageing Conditions
2.6 Strength Tests Characteristics
3 Experimental Results
3.1 Adhesive Butt Joints Strength
3.2 Adhesive Cross-Lap Joints' Strength
4 Summary
References
The Influence of the Packing Material Type on the Adhesive Joints Strength of the Paperboard Packages
Abstract
1 Introduction
2 Methodology
2.1 Packaging Materials' Characteristics
2.2 Description of the Package Types Subject to Tests
2.3 Description of the Packaging Materials' Surface Modification
2.4 Surface Treatment Before the Bonding Process
2.5 Making the Paperboard Packages with Use of the Bonding Technology
2.6 Samples' Preparation for the Strength Tests
3 Test Results
3.1 Adhesive Joints' Strength Test Results
3.2 Packaging Materials' Strength Test Results
3.3 Comparative Analysis of the Material and the Adhesive Joints
4 Summary
References
Studies of Fibre Reinforced Polymer Samples with Embedded FBG Sensors
1 Introduction
2 Experimental Investigation
2.1 Samples
2.2 FBG Sensors
2.3 THz Spectroscopy
3 Conclusions
References
The Preparation of Smart Magnetic Nanoparticles for Intracellular Hyperthermia
Abstract
1 Experimental
1.1 Synthesis of Smart Magnetic Nanoparticles
1.2 Characterization
2 Results and Discussion
2.1 The Formation Mechanism
2.2 Physical Properties of the SMNPs
2.3 Intracellular Hyperthermia
3 Conclusion
Acknowledgments
References
Author Index

Systemvoraussetzungen

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