 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
Archive of Issues
| Total articles in the database: | | 13362 |
| In Russian (Èçâ. ÐÀÍ. ÌÒÒ): | | 8178
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| In English (Mech. Solids): | | 5184 |
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| Zhaoming Zhou, Yuheng Zou, Huaibing Chen, Hui Liu, and Xiude Lu, "Low Cycle Fatigue Failure Analysis of High Strength Steel CT-110 under Cyclic Loading: Numerical and Experimental Research," Mech. Solids. 60 (5), 4335-4351 (2025) |
| Year |
2025 |
Volume |
60 |
Number |
5 |
Pages |
4335-4351 |
| DOI |
10.1134/S0025654425602691 |
| Title |
Low Cycle Fatigue Failure Analysis of High Strength Steel CT-110 under Cyclic Loading: Numerical and Experimental Research |
| Author(s) |
Zhaoming Zhou (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500 China;School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500 China)
Yuheng Zou (School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500 China, 1114986240@qq.com)
Huaibing Chen (CCDC Drilling and Production Technology Research Institute, Xian, 710018 China; National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xian, 710018 China)
Hui Liu (HSE Quality Surveillance and Inspection Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Guanghan, 618300 China)
Xiude Lu (CNPC Chuanqing Drilling Engineering Co., Ltd. Downhole Operation Company, Chengdu, 610051 China) |
| Abstract |
The diameter increase and wall thickness thinning of coiled tubing (CT) are easily caused
by plastic deformation, which seriously affects the service fatigue life of CT. Currently, the basic data
of the CT fatigue life model are obtained from field operation and fatigue testing machines. Among
them, the test procedure for the CT fatigue testing machine is complicated and wastes sample CT.
As the research object CT-110, this work established a theoretical model of CT low-cycle fatigue life
based on shaping strain. A numerical calculation model of the coupling relationship between CT
fatigue life and cycle count is established based on the finite element method (FEM). Finally, experimental verification is carried out. The results show that the material on the compression and tension
sides of the CT flows in the direction of the neutral axial, which leads to a significant thinning of the
wall thickness of the CT under tension and compression. However, the material at the neutral axis is
not subjected to plastic strain. Hence, the maximum plastic strain and fatigue-sensitive area of CT
appear on the axial tensile plane and compression plane, which is consistent with the field failure of
CT. The elastoplastic finite element (FE) results showed good agreement with experimental results.
The numerical results make up for the inaccuracy of theoretical and experimental calculations in predicting the fatigue life of CT. The analysis results provide theoretical guidance for the prediction of CT
fatigue life in actual operation, and it can provide a reference for field operators to effectively avoid economic losses caused by misoperation. |
| Keywords |
CT, cyclic load, low cycle fatigue, numerical calculation, experimental research |
| Received |
27 May 2025 | Revised |
27 July 2025 | Accepted |
28 July 2025 |
| Link to Fulltext |
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