Abstract
Fatigue crack is a problem of concerns for offshore structures. This paper studies the utility of information (UoI) based on the monitoring of fatigue crack. A center-crack specimen with an equivalent constant amplitude stress range is considered as an example to simulate the real fatigue load cases. The failure is introduced by an overload that is applied at a random point in time. Two cases are considered: the case where the fatigue crack is unknown (no possibility to act), and the case where the crack is monitored. With monitoring information, structural performance is assessed at high accuracy level in real-time. This would detect overload and cracks to avoid unnecessary repairing activities and failures. The metric of UoI as a generalization of the Value of Information (VoI) is proposed. The two cases are then compared to quantify the utility of the monitoring information based on the improved decisions. The framework of Sustainable and Resilient Based Engineering (SRBE) recently proposed by one of the authors is adopted. Numerical simulation shows the monitoring information is beneficial to detect critical overloading situations.
| Original language | English |
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| Title of host publication | Proceedings of the 8th International Symposium on Reliability Engineering and Risk Management 4–7 September 2022, Hannover, Germany |
| Editors | Michael Beer, Enrico Zio, Kok-Kwang Phoon, Bilal M. Ayyub, Jasper Behrensdorf |
| Number of pages | 5 |
| Publisher | Research Publishing Services |
| Publication date | 2023 |
| Pages | 662-666 |
| ISBN (Print) | 978-981-18-5184-1, 981-18-5184-0 |
| DOIs | |
| Publication status | Published - 2023 |
Keywords
- Utility of Information (UoI)
- Value of information (VoI)
- fatigue failure
- fracture mechanics
- information theory
- stiffness reduction