Fracture, Fatigue, Failure and Damage Evolution, Volume 8 - Proceedings of the 2015 Annual Conference on Experimental and Applied Mechanics

Preface

Contents

1 Reflection-Mode Digital Gradient Sensing Technique for Experimental Fracture Mechanics

1.1 Introduction

1.2 Optical Setup and Working Principle

1.3 Quasi-Static Mixed-Mode Experiments

1.4 Dynamic Mixed-Mode Experiments

1.5 Conclusions

References

2 Experimental and Computational Investigation of Out-of-Plane Low Velocity Impact Behavior of CFRP Composite Plates

2.1 Introduction

2.2 Experimental Method

2.2.1 Experimental Setup

2.2.2 Experimental Procedure

2.3 Computational Method

2.4 Results

2.4.1 Experimental Results

2.4.1.1 Impact Testing of [07 / 904]s Unidirectional CFRP Laminates

2.4.1.2 Impact Testing of Unidirectional OE [907 ? 04]s CFRP Laminates

2.4.2 Computational Results

2.5 Conclusions

References

3 Prediction of Incipient Nano-Scale Rupture for Thermosets in Plane Stress

3.1 Introduction

3.2 Methods

3.3 Results

3.4 Conclusions

References

4 Effect of Degree of Cure on Damage Development in FRP

4.1 Introduction

4.2 Manufacturing of Specimens

4.3 Tensile Test

4.3.1 Testing Method

4.3.2 Strength and Initial Young's Modulus

4.3.3 Stress-Strain Curves and Feature of Damages

4.3.4 Development of Cracks

4.4 Summary

References

5 Stochastic Discrete Damage Simulations of Laminate Composites

5.1 Introduction

5.2 Random Field Modeling for Fiber-Reinforced Polymer Matrix Laminate

5.2.1 Cross-Correlated Multivariate Random Field Modeling

5.2.2 Orthotropic Spatial Auto-Covariance Function of Random Ply Strength Fields

5.3 Mesh-Independent Discrete Damage Modeling in Laminate Composites

5.4 Probabilistic Discrete Damage Analysis of Laminate Composites

5.4.1 Damage Patterns and Sequences

5.4.2 Effect of Spatial Correlation Length in Strength Properties

5.4.3 Effect of Variance of Matrix Strength Properties

5.4.4 Effect of Correlation Coefficients Between Cross-Correlated Strength Properties

5.5 Conclusions

References

6 Development of a Specimen for In-Situ Diffraction Planar Biaxial Experiments

Nomenclature

6.1 Introduction

6.1.1 Motivation

6.1.2 Background

6.2 Methods

6.3 Results and Discussion

6.3.1 First-Generation Specimen

6.3.2 Second-Generation Specimen

6.4 Conclusions

References

7 V-Notched Rail Test for Shear-Dominated Deformation of Ti-6Al-4V

7.1 Introduction

7.2 Experimental Setup and Testing Procedure

7.2.1 Fixture and Measurements

7.2.2 Preliminary Testing and Test Procedure Modifications

7.2.3 Compliance and Specimen Slip Characterization

7.3 Results and Discussion

7.4 Conclusion

References

8 A Statistical/Computational/Experimental Approach to Study the Microstructural Morphologyof Damage

8.1 Introduction

8.2 Numerical Damage Characterization

8.3 Experimental Damage Characterization

8.4 Discussion

8.5 Conclusions

References

9 Prediction of Ductile Fracture Through Small-Size Notched Tensile Specimens

9.1 Introduction

9.2 Experimental Setup

9.3 Results and Discussion

9.4 Conclusions

References

10 Development of a Generalized Entropic Framework for Damage Assessment

10.1 Introduction

10.2 Total Entropy Produced in a System

10.3 Reliability Assessment Using Entropy as an Index of Damage

10.4 Case Study

10.5 Conclusions

References

11 Modelling of Experimental Observations of Electrical Response of CNT Composites

11.1 Introduction

11.2 Experimental Details

11.3 Experimental Results

11.4 Theoretical Modeling

References

12 Effect of Micro-Cracks on the Thermal Conductivity of Particulate Nanocomposite

12.1 Introduction

12.2 Material and Sample Preparation

12.2.1 Materials Used

12.2.2 Sample Preparation

12.3 Experimental Method

12.3.1 Thermal Conductivity

12.3.2 Fatigue Loading

12.4 Results and Discussion

12.4.1 Modulus of Elasticity

12.4.2 Thermal Conductivity

12.5 Summary

References

13 Fatigue Tests on Fiber Coated Titanium Implant–Bone Cement Interfaces

13.1 Background

13.2 Materials and Methods

13.2.1 Materials

13.2.2 Deposition of Aligned Fiber on Titanium Implant

13.2.3 Preparation of Titanium/Cement Samples

13.2.4 Mechanical Testing on Titanium/Cement Samples

13.2.5 Finite Element Modeling

13.3 Results

13.4 Conclusions

References

14 Fatigue Behavior of Carburized Steel at Long Lives

14.1 Introduction

14.2 Experimental Procedure

14.3 Experimental Results

14.4 Discussion

14.5 Conclusions

References

15 Fatigue Behavior of Fluid End Crossbore Using a Coupon-Based Approach

15.1 Introduction

15.2 Approach

15.2.1 Geometrical Design

15.2.2 Fatigue Analysis

15.2.3 Manufacturing

15.2.4 Elastoplastic Analysis

15.3 Results and Discussion

15.4 Conclusions

References

16 Notch Strain Analysis of Crossbore Geometry

16.1 Introduction

16.1.1 Finite Element Modeling

16.1.2 Notch Strain Analysis

16.1.2.1 Notch Strain Analysis Equations

16.1.2.2 Elastic Stress Concentration Factor

16.2 Results and Discussion

16.2.1 Autofrettage Overload

16.2.2 Autofrettage Unload

16.2.3 Operating Pressure Cycles

16.3 Conclusions

References

17 Opto-acoustic and Neutron Emissions from Fracture and Earthquakes

17.1 Fracture and Acoustic Emission: From Hertz to TeraHertz Pressure Wave Frequencies

17.2 Seismic Precursors: Acoustic, Electromagnetic, Neutron Emissions

17.3 Chemical Evolution of Our Planet and Its Reproduction in the Fracture Mechanics Laboratory

17.4 Chemical Evolution in the Solar System

17.5 A Plausible Explanation of the So-Called Cold Nuclear Fusion

17.6 A Catastrophic Earthquake Behind the Mystery of the Shroud

17.7 Future Applications Also to Biology?

References

18 Field Theoretical Description of Shear Bands

18.1 Introduction

18.2 Theoretical

18.2.1 Plastic Deformation Wave

18.2.2 Shear Band Formation

18.2.3 Hypothesis

18.3 Experimental

18.4 Conclusions

References

19 Measuring the Effective Fracture Toughness of Heterogeneous Materials

19.1 Introduction

19.2 Experiment Configuration

19.3 Data Analysis

19.4 Results

19.5 Conclusion

References

20 Local Strain Analysis of Nitinol During Cyclic Loading

20.1 Introduction

20.2 Materials and Methods

20.2.1 Specimen Geometry and Fabrication

20.2.2 Dynamic Test System and Data Acquisition

20.2.3 Phase-Shifting Moiré Interferometry

20.2.4 Loading Sequences and Cyclic Test Parameters

20.3 Results

20.4 Conclusions

References

21 Environmental Protection by the Opto-acoustic and Neutron Emission Seismic Precursors

21.1 Introduction

21.2 Material and Methods

21.2.1 Acoustic Piezoelectric Transducer

21.2.2 Dedicated Loop and Telescopic Antennas

21.2.3 Radon-Monitor: Ramon 2.2

21.2.4 Carbon Dioxide Meter CO210

21.2.5 3He Proportional Counter

21.3 Experimental Results

21.3.1 Laboratory Tests on Cylindrical Gypsum Specimens

21.4 In-Situ Environmental Monitoring: San Pietro Prato Nuovo Gypsum Mine

21.5 Conclusions

References

22 Neutron Emissions from Hydrodynamic Cavitation

22.1 Introduction

22.2 Experimental Set Up and Measurement Devices

22.3 Neutron Emission Measurements

22.4 Chemical Analysis of the Cavitated Solutions: Preliminar Remarks

22.5 Conclusions

References

23 From Dark Matter to Brittle Fracture

References

24 Compositional Variations in Palladium Electrodes Exposed to Electrolysis

24.1 Introduction

24.2 Experimental Set Up

24.3 Neutron Emission Measurements

24.4 Compositional Analysis of the PD Electrode

24.5 Nickel Electrode Composition Analysis

24.6 Heat Generation and Energy Balance Evaluation

24.7 Conclusions

References

25 Strain-Rate-Dependent Yield Criteria for Composite Laminates

25.1 Introduction

25.2 Lamina Failure

25.3 Northwestern University Yield Criteria

25.4 Strain-Rate-Dependent Yielding of Lamina

25.5 Yielding in Angle-Ply Laminates

25.6 Angle-Ply Rate Dependence

25.7 Conclusion

References

26 Experimental Fatigue Specimen and Finite Element Analysis for Characterization of Dental Composites

26.1 Introduction

26.2 Experimental Method

26.2.1 Specimen Design and Rapid Prototyping

26.2.2 Fatigue Testing

26.3 Finite Element Analysis

26.4 Results and Discussion

26.4.1 FEA Visualization of Crack Tip

26.4.2 Fatigue Testing

26.5 Conclusions

References

27 Fracture Toughness and Impact Damage Resistance of Nanoreinforced Carbon/Epoxy Composites

27.1 Introduction

27.2 Material Processing

27.3 Mode-II Fracture Testing

27.4 Mixed-Mode Testing

27.5 Impact Testing

27.6 Conclusions

References

28 Compression Testing of Micro-Scale Unidirectional Polymer Matrix Composites

28.1 Introduction

28.2 Experimental

28.2.1 Materials and Sample Preparation

28.2.2 In-Situ Micro-Compression Set Up

28.2.3 In-Situ CT Compression Set Up

28.3 Results and Discussion

28.3.1 Micro-Scale Compression Testing

28.3.2 Meso-Scale Compression Testing

28.4 Summary

References

29 Crack Analysis of Wood Under Climate Variations

29.1 Introduction

29.2 Experimental Setup

29.2.1 Sample Preparation

29.2.2 Mechanical Loading for Characterization Static Test in Constant Humidity Environment

29.2.3 Mechanical Loading for Creep Test in Variable Humidity Evironment

29.3 Results and Discussions

29.3.1 Characterization Static Test in Constant Humidity Environment

29.3.2 Creep Test in Variable Humidity Environment

Conclusion and Outlook

References

30 Numerical Fracture Analysis Under Temperature Variation by Energetic Method

30.1 Introduction

30.2 Analytical Formulation of the Invariant Integrals T and A

30.3 Background of Mixed Mode Crack Growth specimen

30.3.1 MMCG Wood Specimen

30.3.2 Viscoelastic Crack Growth Routine with Thermal Fields

30.4 Numerical Results

30.4.1 Finite Element Meshes

30.4.2 Viscoelastic Energy Release Rate

Conclusion

References

31 Use of a Multiplexed Photonic Doppler Velocimetry (MPDV) System to Study Plastic Deformation of Metallic Steel Plates in High Velocity Impact

31.1 Introduction

31.2 Experimental Setup

31.2.1 Two-Stage Light Gas Gun

31.2.2 Materials

31.2.3 Projectile Velocity Determination

31.2.4 MPDV System

31.2.5 Data Reduction Technique

31.3 Results

31.3.1 Physical Observation of the Target Plates

31.3.2 Free Surface Velocity

31.4 Conclusion

References

32 In-service Preload Monitoring of Bolted Joints Subjected to Fatigue Loading Using a Novel `MoniTorque' Bolt

32.1 Introduction

32.2 Theory of FBG Sensor Operation

32.3 Specimen Preparation

32.3.1 MoniTorque Bolt Fabrication

32.3.2 Bolted Joint Assembly

32.4 Experimental Results and Discussion

32.4.1 MoniTorque Bolt Calibration

32.4.2 Static Shear Tests

32.4.3 Monitoring of Preload Levels During Fatigue Loading

32.5 Conclusions

References

33 Fatigue Behavior of Novel Hybrid Fastening System with Adhesive Inserts

33.1 Introduction

33.2 Materials

33.3 Fabrication of Bolted Joints

33.4 Experimental Setup

33.5 Result Discussion

33.5.1 Static Tests

33.5.2 Fatigue Tests

33.6 Conclusion

References