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High-cycle fatigue performance of welded joints of a certain type of titanium alloy used in marine equipment
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Peng YUE1, Peng WANG2, 3, 4, 5, Yuan GAO2, 3, 4, 5, Lin GAN2, 3, 4, Yan-qing LI2, 3, 4, 5
Journal of Ship Mechanics | 2026, 30(5) : 816 - 824
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Journal of Ship Mechanics | 2026, 30(5): 816-824
• Structural Mechanics •
High-cycle fatigue performance of welded joints of a certain type of titanium alloy used in marine equipment
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Peng YUE1, Peng WANG2, 3, 4, 5, Yuan GAO2, 3, 4, 5, Lin GAN2, 3, 4, Yan-qing LI2, 3, 4, 5
Affiliations
  • 1.Military Representative Office of Naval Equipment Department in Wuxi Area, Wuxi 214151, China
  • 2.China Ship Scientific Research Center, Wuxi 214082, China
  • 3.National State Key Laboratory of Deep-sea Manned Vehicles, Wuxi 214082, China
  • 4.Key Laboratory of Ship Structural Safety, Wuxi 214082, China
  • 5.Taihu Laboratory of Deep-sea Technological Science, Wuxi 214082, China
Published: 2026-05-15 doi: 10.3969/j.issn.1007-7294.2026.05.013
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In order to evaluate the fatigue performance and potential application prospects of a certain type of titanium alloy K-TIG welded joint for marine equipment, this study conducted high cycle fatigue tests and fatigue life prediction models research on titanium alloy welded joints with docking form based on the Basquin formula theoretical method and statistical P-S-N probability analysis method. Research results show that the yield and tensile strengths of the titanium alloy welded joint used in marine equipment are 941 MPa and 985 MPa, respectively, with a yield to strength ratio exceeding 0.95 and low plasticity. The high cycle fatigue strength of titanium alloy welded joints expressed as maximum stress under the condition of stress ratio R = 0.1 is 297 MPa, and the ratio to tensile strength (fatigue ratio) is only 0.3. Characterization of fatigue fracture characteristics using electron scanning microscopy indicates that fatigue cracks originate at the weld toe of the welded joint, fatigue striations appear in the fatigue crack propagation zone, with a large number of ductile dimples in the instantaneous fracture zone. The median curves of maximum stress, stress amplitude, maximum load, and fatigue life of welded joints were obtained based on the Basquin formula. Meanwhile, P-S-N fatigue assessment models were provided under different survival rate conditions. The research in this article has reference value for the service safety assessment of marine equipment structures.

titanium alloy welded joint  /  high-cycle fatigue  /  fatigue strength  /  S-N curve  /  fatigue fracture characteristics
Peng YUE, Peng WANG, Yuan GAO, Lin GAN, Yan-qing LI. High-cycle fatigue performance of welded joints of a certain type of titanium alloy used in marine equipment[J]. Journal of Ship Mechanics, 2026 , 30 (5) : 816 -824 . DOI: 10.3969/j.issn.1007-7294.2026.05.013
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Year 2026 volume 30 Issue 5
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doi: 10.3969/j.issn.1007-7294.2026.05.013
  • Receive Date：2025-11-10
  • Online Date：2026-07-07
  • Published：2026-05-15
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  • Received：2025-11-10
Affiliations
    1.Military Representative Office of Naval Equipment Department in Wuxi Area, Wuxi 214151, China
    2.China Ship Scientific Research Center, Wuxi 214082, China
    3.National State Key Laboratory of Deep-sea Manned Vehicles, Wuxi 214082, China
    4.Key Laboratory of Ship Structural Safety, Wuxi 214082, China
    5.Taihu Laboratory of Deep-sea Technological Science, Wuxi 214082, China
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https://castjournals.cast.org.cn/joweb/cblx/EN/10.3969/j.issn.1007-7294.2026.05.013
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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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