On the effectiveness and uncertainty of inspection methods for fatigue crack management

Title: On the effectiveness and uncertainty of inspection methods for fatigue crack management
Authors: Zou, Guang
Banisoleiman, Kian
Gonzalez Merino, Alberto
Permanent link: http://hdl.handle.net/10197/9542
Date: 30-Aug-2018
Abstract: Non-destructive testing (NDT) methods have been widely used for damage examination and structural maintenance, e.g. detecting and repairing fatigue cracks. In-service inspections help to increase fatigue reliability by providing new information for updating structural failure probability and making decisions on repair. However, these benefits are often compromised by uncertainties associated with inspection methods. Sometimes existing cracks may not be identified, and positive inspection indication may not exist. It is of great interest to consider the influence of inspection uncertainty in maintenance optimization because the benefits and costs of maintenance are affected by inspection decisions (inspection times and methods) which are subjected to inspection uncertainty. However, the influence of inspection uncertainty on maintenance optimization has not been explicitly and adequately covered in the literature. In this paper, the problem has been investigated by probabilistic modelling of the qualities of inspection methods via probability of detection (PoD) functions. A new PoD function has been proposed to characterize the inspection quality when inspection uncertainty is not considered. Optimum inspection decisions are derived with the objective of maximizing lifetime reliability index under two scenarios (considering and not considering inspection uncertainty). The effectiveness of a planned inspection is defined based on the max reliability indexes under the two scenarios. It is shown that the max lifetime reliability index generally decreases when inspection uncertainty is considered. However, inspection uncertainty may have little influence on the lifetime reliability index depending on the planned inspection time. The effectiveness of a planned inspection increases with the decrease of the mean detectable crack size.
Funding Details: European Commission Horizon 2020
Type of material: Conference Publication
Publisher: CERAI
Keywords: Structural integrity managementRisk-based inspectionMaintenance optimizationInspection uncertainty
Other versions: http://www.cerai.net/
Language: en
Status of Item: Peer reviewed
Is part of: Proceedings of the Civil Engineering Research In Ireland Conference (CERI 2018)
Conference Details: The 2018 Civil Engineering Research in Ireland Conference (CERI 2018), Dublin, Ireland, 29-30 August 2018
Appears in Collections:Critical Infrastructure Group Research Collection
Earth Institute Research Collection
Civil Engineering Research Collection
TRUSS-ITN Research Collection

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