Simulation of non-destructive inspections and acoustic emission measurements involving guided waves

In a structure that guides elastic waves, a discontinuity (defect, shape variation) causes scattering (reflection, partial extinction or mode conversion). Two modal formulations have been developed to link separate models dealing with the calculation of the modal decomposition, with the generation a...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Conference series 2009-11, Vol.195 (1), p.012001
Main Authors: Baronian, V, Lhémery, A, Bonnet-BenDhia, A-S
Format: Article
Language:English
Subjects:
Acoustic emission testing
Acoustics
Boundary conditions
Computation
Configurations
Decomposition
Dirichlet problem
Discontinuity
Elastic waves
Emission analysis
Finite element method
Mathematical analysis
Nondestructive testing
Physics
Simulation
Transducers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In a structure that guides elastic waves, a discontinuity (defect, shape variation) causes scattering (reflection, partial extinction or mode conversion). Two modal formulations have been developed to link separate models dealing with the calculation of the modal decomposition, with the generation and reception of guided waves (GW), with their scattering. The first concerns pulse-echo configurations (involving a single transducer), the other concerns pitch-catch configurations (two transducers involved). A new finite element (FE) method has been developed to compute the scattering by an arbitrary discontinuity, based on the modal decomposition of the field. Perfectly transparent boundary conditions (Dirichlet-to-Neuman boundaries) are developed, allowing the FE computation zone to be reduced to a minimum. A specific variational problem including these boundary conditions was obtained and solved using FE tools. By combining the modal formulations, the new FE scheme and tools for GW radiation, propagation and reception based on the Semi-Analytical Finite Element (SAFE) method, a new simulation tool has been developed. It can address almost arbitrary configurations of GW nondestructive testing. Moreover, a source inside the FE computation zone can be defined so that configurations of testing by acoustic emission can also be simulated. Examples of use of this tool are shown, some dealing with junctions of complex geometry between two guides, other with surface or bulk sources of acoustic emission.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/195/1/012001