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| Fatigue Damage Assessment of Ship-shaped Net Cages Based on Fracture Mechanics |
| Received:July 15, 2023 Revised:September 07, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2023.09.012 |
| KeyWord:marine structures submodel strength analysis finite element calculation crack propagation |
| Author | Institution |
| LIU An-min |
College of Engineering, Ocean University of China, Shandong Qingdao , China |
| XIE Ling-jun |
College of Engineering, Ocean University of China, Shandong Qingdao , China |
| SU Yi-ming |
College of Engineering, Ocean University of China, Shandong Qingdao , China |
| DING Hong-tao |
College of Engineering, Ocean University of China, Shandong Qingdao , China |
| HE Wen-tao |
College of Engineering, Ocean University of China, Shandong Qingdao , China |
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| Abstract: |
| The work aims to evaluate the fatigue damage of marine structures through fracture mechanics and direct calculation methods. Structural strength assessment was performed by the finite element method and spectral analysis to find out the hot-spot stress. Local refined modeling was used for these hot-spots, and fatigue crack growth was evaluated by fracture mechanics methods to assess the fatigue damage of marine structures. The results showed that the ship-shaped net cage exhibited maximum motion amplitude when wave incidence angles were 0° and 180° and met the strength requirements but showed significant stress concentration. By selecting three fatigue hot-spots for crack propagation analysis, fatigue lifespans of 11.3 years, 17.3 years, and 33.1 years were obtained. This study successfully achieves strength analysis and lifespan prediction of marine structures based on spectral analysis and fracture mechanics, addressing the balance between computational efficiency and accuracy in fatigue damage assessment of marine structures as well as the coupling of overall models and local cracks. |
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