Sub-wavelength characterisation of defects in inaccessible regions using guided waves
Lead Research Organisation:
University of Bristol
Department Name: Mechanical Engineering
Abstract
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Publications
Moreau L
(2012)
Scattering of guided waves by flat-bottomed cavities with irregular shapes
in Wave Motion
Moreau L
(2014)
3-D reconstruction of sub-wavelength scatterers from the measurement of scattered fields in elastic waveguides.
in IEEE transactions on ultrasonics, ferroelectrics, and frequency control
Moreau L
(2011)
Scattering of guided waves by through-thickness cavities with irregular shapes
in Wave Motion
Moreau L
(2012)
Accurate finite element modelling of guided wave scattering from irregular defects
in NDT & E International
Velichko A
(2009)
Excitation and scattering of guided waves: relationships between solutions for plates and pipes.
in The Journal of the Acoustical Society of America
Velichko A
(2010)
A generalized approach for efficient finite element modeling of elastodynamic scattering in two and three dimensions.
in The Journal of the Acoustical Society of America
| Description | The project examined how guided ultrasonic waves could be used to gain quantitative information about the severity of defects in inaccessible locations in safety-critical structures. In discussions with the industrial sponsors, pipes were selected as the most appropriate structure for investigation. A typical scenario might be a defect in a pipe passing through a containment wall in a nuclear power station where there is no direct access to the pipe inside the containment. In essence a sizing method has been defined that gives an estimate of maximum defect depth in cases where the defect profile does not contain sharp changes; if the defect is large in circumferential and axial extent (>~100 mm) then the depth can be estimated from reflection measurements alone, whereas if it is smaller, reflection and transmission measurements must be used. A method to diagnose the presence of sharp profile changes, and hence to determine whether the sizing method is applicable, has also been developed. The technique is being disseminated to the guided wave inspection community and can be implemented in commercial equipment. It will now have to be tested in the field on multiple defects. |
| Exploitation Route | Techniques have been implemented on commercial guided wave inspection equipment and deployed in the field. |
| Sectors | Aerospace, Defence and Marine,Chemicals,Energy,Transport |
| Description | Findings have been implemented in defect-sizing protocols employed in commercial guided wave testing. |
| Sector | Aerospace, Defence and Marine,Chemicals,Energy,Transport |
| Impact Types | Economic |