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Lamb Waves for Structural Health Monitoring in Viscoelastic Composite Materials

Mircea Calomfirescu

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Mircea Calomfirescu, Lamb Waves for Structural Health Monitoring in Viscoelastic Composite Materials (2008), Logos Verlag, Berlin, ISBN: 9783832599683

Getrackt seit 05/2018

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Beschreibung / Abstract

Strucural Health Monitoring (SHM) is a novel philosophy for an autonomous, built-in nondestructive evalution of structural "health" on demand to reduce life-cycle costs, increase safety and reduce structural weight. This dissertation investigates ultrasonic guided waves, particulary Lamb waves, and their propagation properties as a method to perform Health Monitoring of viscoelastic composite structures.

Inhaltsverzeichnis

  • BEGINN
  • 1 INTRODUCTION
  • 1.1 Background of Structural Health Monitoring
  • 1.2 State of the Art and Perspectives
  • 1.3 Objective of the Thesis
  • 1.4 Content of the Thesis
  • 2 THEORETICAL BACKGROUND
  • 2.1 Lamb waves
  • 2.2 Wave attenuation mechanisms
  • 2.3 Fundamentals of piezoelectric materials and PWAS
  • 2.4 Signal processing
  • 3 DEVELOPMENT OF A THEORETICAL MODEL FOR LAMB WAVE PROPAGATION IN VISCOELASTIC COMPOSITES
  • 3.1 Material damping model
  • 3.2 Classical plate theory
  • 3.3 Higher order plate theory
  • 4 DEVELOPMENT OF A SOFTWARE FOR THE PREDICTION OF LAMB WAVE PROPAGATION IN ATTENUATIVE COMPOSITES
  • 4.1 Introduction
  • 4.2 Program FIBREWAVE
  • 4.3 Program results and discussion
  • 5 NON DESTRUCTIVE MATERIAL CHARACTERIZATION
  • 5.1 CFRP Material
  • 5.2 Immersion technique for material characterization
  • 5.3 Results
  • 5.4 Lamb Wave attenuation factors
  • 6 EXPERIMENTAL INVESTIGATIONS OF WAVE PROPAGATION (WAVE EXCITATION BY PWAS)
  • 6.1 Experimental set-up
  • 6.2 Excitation of Lamb waves
  • 6.3 Excitability
  • 6.4 Verification of the developed theory and software
  • 7 EXPERIMENTAL INVESTIGATION OF WAVE PROPAGATION UNDER IMPACT HAMMER EXCITATION
  • 7.1 Experimental set-up
  • 7.2 Measurements and Signal Processing
  • 8 NUMERICAL STUDIES WITH EXPLICIT FINITE ELEMENT ANALYSIS
  • 8.1 Finite element model
  • 8.2 Results
  • 8.3 Experimental vs. numerical results
  • 9 DEVELOPMENT OF A METHOD FOR THE DETECTION OF IMPACT EVENTS
  • 9.1 Arrival time detection
  • 9.2 Localization of impact events
  • 9.3 Determination of contact force histories
  • 9.4 Testing of the developed method
  • 10 FURTHER APPLICATIONS OF LAMB WAVES: IN-SITU QUANTITATIVE VISCOELASTIC MATERIAL CHARACTERIZATION
  • 10.1 Mathematical method for function minimization
  • 10.2 Sensitivity analysis
  • 10.3 Infer Viscoelastic material properties
  • 10.4 Comparison of obtained results with other methods
  • 11 CONCLUSIONS
  • 11.1 Summary of performed work
  • 11.2 Contributions to the advancement of the state of the art
  • 11.3 Suggested further work and applications
  • 12 APPENDIX
  • 12.1 Excitability results
  • 12.2 Dispersion diagrams
  • 12.3 Attenuation dispersion diagrams

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