A Brief Investigation on the Effects of Metallic and Composite Patches on the Behavior of Aged Parts Using Numerical Methods (FEM) and Lamb Waves Propagation

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Mollaei, Fouad | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42733 (45)
University: Shrif University of Technology
Department: Aerospace Engineering
Advisor(s): Abedian, Ali
Abstract:
The main purpose of this text is to develop a method for health monitoring of patch-repaired structures. The method consists of usage of piezoelectric wafer active sensors (PWAS) in the mean of stress waves in plate-like structures and processing the obtained results gathered from these sensors using finite element method. During this analysis, effect of different parameters has been investigated by sensitivity analysis methods. The main kind of stress waves that used are lamb wave of different kind. The behavior of main structure due to propagation of symmetric and anti-symmetric modes of lamb wave was investigated. Beginning with finding the results of un-damaged and un-repaired structures, by continuing analysis around adding patch and different modes of defect, a comparison has been made to find out what kind of effect will occur as a result of patch and defects
Keywords:
Lamb Wave ; Piezoelectric Transducers ; Composite Patch Repair ; Wave Propagation ; Nondestructive Inspection (NDI)

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