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Study on the ultimate bearing capacity of high steel grade elbow with trench defects
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Tao ZHANG1, Ying ZHANG1, Pengcheng ZHAO1, Jiayin WANG2, Zhanyou HE3, Peilin SONG1
Journal of Mechanical Strength | 2025, 47(6) : 124 - 131
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Journal of Mechanical Strength | 2025, 47(6): 124-131
• Experimental Research·Testing Technology •
Study on the ultimate bearing capacity of high steel grade elbow with trench defects
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Tao ZHANG1, Ying ZHANG1, Pengcheng ZHAO1, Jiayin WANG2, Zhanyou HE3, Peilin SONG1
Affiliations
  • 1.School of Safety Science and Engineering, Changzhou University, Changzhou 213164, China
  • 2.Qingdao Qinggang Tongda Energy Co., Ltd., Qingdao 266555, China
  • 3.Oil and Gas Technology Research Institute, Changqing Oilfield Company, Xi’an 710018, China
Published: 2025-06-15 doi: 10.16579/j.issn.1001.9669.2025.06.015
Outline
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Elbows are an important component of oil and gas pipelines. The force state and the medium flow state are more complex than that of the straight pipe. Once the defect occurs at the elbow, the elbow pipe is more prone to fail. The high steel grade pipeline is the development trend of the long distance oil and gas pipeline construction, and it is urgent to evaluate the residual strength of the high steel grade bending pipe. Through the establishment of the finite element model, the defect size, relative position, bending radius, pipe parameters and pipe performance influence were studied on the ultimate internal pressure of the elbow, and finally the prediction formula of the bending was established. The results show that with the increase of defect length and defect depth, the ultimate internal pressure of the elbow is significantly reduced. The trench defect affects the ultimate internal pressure when the trench defect is located in the inner arch of the elbow. The bending radius, the wall thickness and the pipe material will affect the ultimate internal pressure. The error analysis shows that the prediction formula is more accurate, which can provide the basis for the residual strength evaluation of high steel grade elbows with trench defects.

Elbows  /  Trence defect  /  Ultimate internal pressure  /  Finite element analysis  /  Prediction formula
Tao ZHANG, Ying ZHANG, Pengcheng ZHAO, Jiayin WANG, Zhanyou HE, Peilin SONG. Study on the ultimate bearing capacity of high steel grade elbow with trench defects[J]. Journal of Mechanical Strength, 2025 , 47 (6) : 124 -131 . DOI: 10.16579/j.issn.1001.9669.2025.06.015
Funding
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  • CNPC-Changzhou University Innovation Consortium Science and Technology Cooperation project(KYZ22020129)
  • Jiangsu Province Graduate Student Practice Innovation Plan Project(SJCX23_1584)
Appendix
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Year 2025 volume 47 Issue 6
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Article Info
doi: 10.16579/j.issn.1001.9669.2025.06.015
  • Receive Date：2023-10-20
  • Online Date：2026-03-18
  • Published：2025-06-15
Article Data
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History
  • Received：2023-10-20
  • Revised：2023-12-06
Funding
CNPC-Changzhou University Innovation Consortium Science and Technology Cooperation project(KYZ22020129)
Jiangsu Province Graduate Student Practice Innovation Plan Project(SJCX23_1584)
Affiliations
    1.School of Safety Science and Engineering, Changzhou University, Changzhou 213164, China
    2.Qingdao Qinggang Tongda Energy Co., Ltd., Qingdao 266555, China
    3.Oil and Gas Technology Research Institute, Changqing Oilfield Company, Xi’an 710018, China

Corresponding:

ZHANG Ying, E-mail：
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Citations
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
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Genus		 种数
Number of
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Percentage of total
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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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