Journal
BRODOGRADNJA
Volume 70, Issue 1, Pages 11-24Publisher
UNIV ZAGREB FAC MECHANICAL ENGINEERING & NAVAL ARCHITECTURE
DOI: 10.21278/brod70102
Keywords
Crack propagation; Semi-submersible; FAD; Fracture mechanics; Structural safety; Offshore platform
Categories
Funding
- National Natural Science Foundation of China [51709118]
- China Postdoctoral Science Foundation [2017M612669]
- Science and Technology Program of Guangzhou [201804010482]
- Fundamental Research Funds for the Central Universities [2017BQ089]
- Funds for Marine Economic Development of Guangdong, China [GDME-2018B003]
- State Key Laboratory of Ocean Engineering (Shanghai Jiao Tong University) [1708]
- State Key Laboratory of Coastal and Offshore Engineering (Dalian University of Technology) [LP1805]
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This paper deals with the assessment of fatigue crack propagation on the connection between column and brace for a semi-submersible. The analysis of global and local structural responses under different sea states are performed to acquire the transfer functions of stresses. Based on an existing crack the Failure Assessment Diagrams (FAD) are applied as criterion of acceptance for the safety of crack and structure during the crack growth calculation cycle. The crack growth rate considering threshold stress intensity factor and stress ratio is used. During safety assessment the stress response from ultimate sea state is outlined. A comparison of fatigue crack growth using ultimate stress and normal stress data with different crack growth rate is presented. The results show the reliability of fatigue assessment using FAD as a measurement of acceptability of crack propagation.
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