Search results for " damage detection"

showing 3 items of 3 documents

The Global-Local Approach for Damage Detection in Composite Structures and Rails

2021

Structural components with waveguide geometry can be probed using guided elastic waves. Analytical solutions are prohibitive in complex geometries, especially in presence of structural discontinuities or defects. The Global-Local (GL) approach provides the solution by splitting the waveguide in “local” and “global” regions. The “local” region contains the part of the structure responsible for the complex scattering of an incident wave. What happens in this region cannot be reproduced analytically. The “global” region is regular and sufficiently far from the scatterer, in order to exploit known analytical wave propagation solutions. The proposed GL approach discretizes the local region by re…

PhysicsAircrafts Composite structures Damage detection Global-Local approach Guided waves Rails Scattering Semi-analytical finite element methodGuided waves scattering Global-Local approach damage detection semi-analytical finite element method composite structures aircrafts railsScatteringWave propagationMathematical analysisWaveguide (acoustics)KinematicsClassification of discontinuitiesSettore ICAR/08 - Scienza Delle CostruzioniFinite element methodEnergy (signal processing)Spectral line
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Detection of damage in civil engineering structures by PCA on enviromental vibration data

2018

The dynamic behavior of civil engineering structures are usually studied by means of ambient vibration observations and their performance is analyzed by Peak Picking and/or Operational Modal Analysis methods. This paper reports the first results of a statistical multivariate approach, specifically Principal Component Analysis, to detect a suspected structural damage on a sicilian highway bridge. Furthermore, the damage simulated in a simple structural model made it possible to understand the characteristics of the method consisting in comparing the observed data on an undamaged structure with those coming from a damaged one.

Principal component analysis damage detection subspace angles Operational modal analysis Fast Fourier Transform Peak Picking
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Guided Wave Techniques for Damage Detection in Composite Aerospace Structures

2018

Composite materials make up an increasing portion of today’s aerospace structures (see, e.g. Boeing 787 and Airbus 380). These aircrafts’ fuselage, for example, is composed of a laminated composite skin connected to composite stringers and C-frames. Of primary importance is the detection of damage in these built-up structures, whether caused by the manufacturing process or in service (e.g. impacts). A related issue is the characterization of the composite (visco)elastic mechanical properties, that can also be related to the quantification of potential damage. Guided elastic waves propagating in the ~100s kHz regime lend themselves to provide the necessary sensitivity to these two conditions…

guided waves dispersion damage detection composites anisotropy semi-analytical finite element method air-coupled ultrasonic testingSettore ICAR/08 - Scienza Delle Costruzioni
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