Lamb Waves for Structural Health Monitoring in Viscoelastic Composite Materials

Mircea Calomfirescu

Cite this publication as

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

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Descripción / 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.

Índice

  • 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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