Cumulative damage analysis of ice-induced structural fatigue for polar ships navigating in ice-covered regions

Ji Shunying; Wang Jianwei; Yuan Kuilin; Zhang Rui

doi:10.12284/hyxb2023051

Volume 45 Issue 7

Jul. 2023

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Article Navigation > Haiyang Xuebao > 2023 > 45(7): 102-109

Ji Shunying，Wang Jianwei，Yuan Kuilin, et al. Cumulative damage analysis of ice-induced structural fatigue for polar ships navigating in ice-covered regions[J]. Haiyang Xuebao，2023, 45(7)：102–109 doi: 10.12284/hyxb2023051

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Cumulative damage analysis of ice-induced structural fatigue for polar ships navigating in ice-covered regions

doi: 10.12284/hyxb2023051

1.
State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, Dalian University of Technology, Dalian 116023, China
2.
School of Naval Architecture Engineering, Dalian University of Technology, Dalian 116023, China
3.
State Grid Dalian Electric Supply Company, Dalian 116001, China

Received Date: 2021-04-14
Rev Recd Date: 2021-08-20

Available Online: 2023-06-09

Publish Date: 2023-07-01

Abstract

Abstract

Polar ships always collide with various types of sea ice in varying degrees during their voyages in ice-covered regions, so sufficient fatigue strength reserves are essential. This paper proposes a cumulative damage analysis method for ice-induced fatigue on polar ship structures based on field measured ice loads. Firstly, according to the statistical analysis of the field data of ice thickness and sailing speed of RV Xue Long during the China’s 8th Arctic Scientific Expedition, ice-induced fatigue conditions are constructed within the ice thickness range of 0.5−2.5 m and the sailing speed range of 2−12 kn. The joint probability distribution of the two parameters is taken as the occurrence probability of fatigue conditions. Then, the time histories of ice loads under typical conditions are identified based on the support vector machine method. The key positions and corresponding hot spot stresses are determined by dynamic analysis. The rainflow counting algorithm is adopted to count the number of stress cycles. Finally, the fatigue damage during the voyage is further calculated by S-N curve and Miner linear cumulative damage theory, which verifies the ice navigation safety of RV Xue Long. This paper has certain reference significance for the ice-resistant design and safety evaluation of polar ship structures.
- polar ship structure,
- ice-induced fatigue,
- cumulative fatigue damage,
- field measurement,
- navigation in ice-covered regions

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References(31)

References

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