Effect of changing stress on damage diagnostic with guided waves
Date
2017
Authors
Mohabuth, M.
Kotousov, A.
Ng, C.
Rose, L.
Editors
Chan, T.
Mahini, S.
Mahini, S.
Advisors
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Conference paper
Citation
8th International Conference on Structural Health Monitoring of Intelligent Infrastructure (SHMII 2017): Structural health monitoring in real-world application, 2017 / Chan, T., Mahini, S. (ed./s), vol.3, pp.1241-1246
Statement of Responsibility
M. Mohabuth, A. Kotousov, C-T Ng, L. R. F. Rose
Conference Name
International Conference on Structural Health Monitoring of Intelligent Infrastructure (SHMII) (5 Dec 2017 - 8 Dec 2017 : Brisbane, Australia)
Abstract
SHM systems based on guided waves commonly utilise a signal subtraction approach to detect damage using a network of embedded or permanently attached sensors/transducers. In this approach, the presence of damage is normally determined by analysing the residual signals from the structure after subtracting the damage-free reference data. It is well-known that variations in temperature can compromise this approach and lead to false alarms or masking of the damage. Consequently, several temperature compensation strategies have been proposed. In this paper, we demonstrate that changing stress conditions can produce a similar effect, comparable with modest temperature variations. This analysis provides a basis to compensate for the effect of applied or thermally-induced stresses on the detectability of damage. This is particularly important for self-constrained or partially constrained structures, such as rails or reinforced concrete, where the stresses are very difficult to evaluate or control.
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Copyright © (2017) by International Society for Structural Health Monitoring of Intelligent Infrastructure All rights reserved