Investigation of Methods to Detect Defects in Thin Layered Materials

Cost effective and reliable damage detection is critical for the utilization of thin layered materials and microstructures.This Thesis presents a brief overview of conventional NDT methods and the usage of unconventional NDT methods applicable to thin layered materials, and the conclusion of applicability of these methods for damage detection in thin layered materials.


1 Notation
2 Introduction
3 Literature review of NDT methods
3.1 Types of damages in composites
3.2 Visual and optical testing
3.2.1 Direct visual testing
3.2.2 Remote visual testing
3.3 Liquid penetrant testing
3.4 Magnetic particle inspection
3.5 Electro magnetic or Eddy current testing
3.6 Radiography
3.7 Ultrasonic testing
3.7.1 Resonance Technique
3.7.2 Pulse Technique
3.7.3 General non-destructive testing using Rayleigh and Lamb waves
3.7.4 Localized non-destructive testing using Rayleigh and Lamb wave
3.7.5 Long range non destructive testing using Lamb wave
3.8 Summary review of conventional NDT methods
4 Unconventional NDT methods
4.1 Material characterization by air-coupled Ultrasound
4.1.1 Presentation
4.1.2 Focus slanted transmission mode
4.1.3 Defect imaging using FSTM
4.1.4 Applicability to thin flexible materials
4.2 Shearography
4.2.1 Presentation
4.2.2 Applications
4.3 Thermography
4.3.1 Presentation
4.3.2 Applications
4.3.3 Pulsed thermography
4.3.4 Vibrothermography
4.3.5 Lock-in thermography
4.3.6 Applicability to material of interest
4.4 Ultrasonic spectroscopy
4.4.1 Presentation
4.4.2 Linear Angle Beam Ultrasonic Spectroscopy
4.4.3 Nonlinear Angle Beam Ultrasonic Spectroscopy
4.5 Acoustic microscopy
4.5.1 Presentation
4.5.2 Application
4.5.3 Scanning acoustic microscopy
4.5.4 Photo Acoustic Spectroscopy
4.5.5 Guided wave techniques
4.5.6 Bulk wave Techniques
4.5.7 Guided Acoustic Waves in Layered Films
4.6 Vibration based methods
4.6.1 Model-based vibration methods
4.6.2 Model independent vibration methods
4.6.3 Base line strain energy mode shapes method
4.6.4 Non-base line strain energy mode shapes method
4.7 Sound transmission methods
4.7.1 Presentation
4.7.2 Transmission loss
4.7.3 Energy loss by air-coupled ultrasound
4.8 Summary review of various unconventional NDT methods
5 Conclusions
6 References

Author: Husam M. Hassan & Ajaykumar S. Chinthalapndi

Source: Blekinge Institute of Technology

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