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Fatigue life prediction method for ship structures based on spectral loading and improved unique curve model
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Li SUN1, Shu-ting LIAO1, Xiao-ping HUANG2, Zhao-long ZHANG1, Fan-chao WANG1
Journal of Ship Mechanics | 2025, 29(11) : 1734 - 1745
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Journal of Ship Mechanics | 2025, 29(11): 1734-1745
• Structural Mechanic •
Fatigue life prediction method for ship structures based on spectral loading and improved unique curve model
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Li SUN1, Shu-ting LIAO1, Xiao-ping HUANG2, Zhao-long ZHANG1, Fan-chao WANG1
Affiliations
  • 1.Marine Design and Research Institute of China, Shanghai, 200011, China
  • 2.State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
doi: 10.3969/j.issn.1007-7294.2025.11.007
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Ship structures operate continuously in the marine environment, where they are prone to fatigue crack growth (FCG) under complex alternating loading, therefore it is of great significance to accurately predict the FCG and ensure the safety of structures. In this paper, the load spectrum constructed by the spectral method was combined with an improved unique curve crack growth model, and a method was proposed to more accurately predict the FCG in the near-threshold regime for ship structures under spectral loading. A balcony opening corner in a cruise ship was taken as an example; the method for determining the shape exponents in the improved model was given, the FCG of this structure under spectral loading was predicted, and the effects of the initial crack length and crack growth model on the FCG were discussed. The results show that the prediction method can more accurately predict the FCG in the near-threshold regime, and the prediction result is more conservative than that predicted by the unique curve model recommended in the regulations of CCS. The method presented in this paper can also provide a reference for the fatigue life assessment of other marine structures.

spectral loading  /  improved unique curve model  /  near-threshold regime  /  balcony opening corner  /  fatigue crack growth prediction
Li SUN, Shu-ting LIAO, Xiao-ping HUANG, Zhao-long ZHANG, Fan-chao WANG. Fatigue life prediction method for ship structures based on spectral loading and improved unique curve model[J]. Journal of Ship Mechanics, 2025 , 29 (11) : 1734 -1745 . DOI: 10.3969/j.issn.1007-7294.2025.11.007
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doi: 10.3969/j.issn.1007-7294.2025.11.007
  • Receive Date：2025-05-18
  • Online Date：2026-03-18
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  • Received：2025-05-18
Affiliations
    1.Marine Design and Research Institute of China, Shanghai, 200011, China
    2.State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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