Dislocation detection of gas turbine materials using a nonlinear ultrasound modulation technique
Dislocation detection of gas turbine materials using a nonlinear ultrasound modulation technique
Industrial gas turbines are used for generating electricity or driving other turbomachinery with the continuous development goal of further increasing machine efficiency. This is primarily achieved by raising the pressure ratio generated in the compressor and by increasing the turbine inlet temperature. Consequently, the hot gas components in gas turbines are subjected to extreme loads and the need for non-destructive testing and structural health monitoring techniques is becoming increasingly important to maintain these components. An important indicator for assessing the structural integrity is the determination of the initial plastic deformation. In this paper, a new method for the detection of plasticity was developed, which is based on a nonlinear ultrasonic two-frequency excitation. The one-dimensional wave equation was solved with a two-frequency excitation and combined with the expanded dislocation theory. As a result, various nonlinearity parameters were defined, showing a clear increasing or a decreasing behaviour with increasing plastic strain. This was experimentally proven with flat tensile specimen made of stainless steel and Inconel 718 (metal plates and additively manufactured). The new indicators allow the possibility to efficiently detect the initial plastic deformation in gas turbine components.
Dislocation detection, Gas turbines, Nonlinear ultrasound
Mevissen, Frank
c2217944-57dd-44d7-9e8d-5da906a799b7
Meo, Michele
f8b3b918-5aed-491d-8c14-4d1c24077390
10 July 2023
Mevissen, Frank
c2217944-57dd-44d7-9e8d-5da906a799b7
Meo, Michele
f8b3b918-5aed-491d-8c14-4d1c24077390
Mevissen, Frank and Meo, Michele
(2023)
Dislocation detection of gas turbine materials using a nonlinear ultrasound modulation technique.
Mechanical Systems and Signal Processing, 200, [110563].
(doi:10.1016/j.ymssp.2023.110563).
Abstract
Industrial gas turbines are used for generating electricity or driving other turbomachinery with the continuous development goal of further increasing machine efficiency. This is primarily achieved by raising the pressure ratio generated in the compressor and by increasing the turbine inlet temperature. Consequently, the hot gas components in gas turbines are subjected to extreme loads and the need for non-destructive testing and structural health monitoring techniques is becoming increasingly important to maintain these components. An important indicator for assessing the structural integrity is the determination of the initial plastic deformation. In this paper, a new method for the detection of plasticity was developed, which is based on a nonlinear ultrasonic two-frequency excitation. The one-dimensional wave equation was solved with a two-frequency excitation and combined with the expanded dislocation theory. As a result, various nonlinearity parameters were defined, showing a clear increasing or a decreasing behaviour with increasing plastic strain. This was experimentally proven with flat tensile specimen made of stainless steel and Inconel 718 (metal plates and additively manufactured). The new indicators allow the possibility to efficiently detect the initial plastic deformation in gas turbine components.
Text
20220303_FMe_Dislocation_FINAL_REF
- Accepted Manuscript
More information
Accepted/In Press date: 22 June 2023
e-pub ahead of print date: 10 July 2023
Published date: 10 July 2023
Keywords:
Dislocation detection, Gas turbines, Nonlinear ultrasound
Identifiers
Local EPrints ID: 502017
URI: http://eprints.soton.ac.uk/id/eprint/502017
ISSN: 0888-3270
PURE UUID: 439e2f58-7ee7-4e0b-8298-990dfa75a612
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Date deposited: 13 Jun 2025 16:44
Last modified: 22 Aug 2025 04:02
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Contributors
Author:
Frank Mevissen
Author:
Michele Meo
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