METAIS AND METAL MATRIX COMPOSITES |
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Prediction of Fatigue Crack Propagation of X56 Steel Submarine Pipelines in Corrosive Environment |
GAO Xudong1, SHAO Yongbo1, XIE Liyuan1, YANG Dongping2
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1 School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China 2 Technology Inspection Center,China Petroleum & Chemical Corporation,Dongying 257062,China |
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Abstract Corrosive fatigue failure is universally existed in the submarine pipeline because of the immersion of pipeline in marine environment. An accurate method is critical for predicting the residual life of these pipelines. We studied the fatigue crack propagation behavior of the cracked pipeline under cyclic load of ocean waves, and proposed a novel approach for predicting the fatigue life of submarine pipeline. Then, we acquired the Paris law constants of X56 steel by employing the newly proposed shape factor to analyze the test data, and analyze the fatigue crack propagation behavior of the X56 steel under corrosive environment. Furthermore, we utilized the finite element software to simulate the fatigue crack propagation process and calculate the stress intensity factor (ΔK), and we conducted the residual life prediction of the X56 pipeline according to the Paris law. As could be seen from the results, for a given ΔK, the X56 steel pipeline showed a 1.6 times fatigue crack growth rates (da/dN) in seawater of that in air. Additionally, the influence of seawater on corrosive fatigue weakened gradually as the increasing fatigue crack growth rate. The results of residual life prediction of X56 steel pipeline conducted by the new approach was taken in comparison with the experimental results of a full-scale pipeline specimen, indicating the validity of the proposed approach in predicting the fatigue crack propagation state and the residual fatigue life of pipelines.
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Published: 03 January 2020
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About author:: Xudong Gao, master. He graduated from Liaoning Shihua University with a bachelor's degree in 2016. From September 2017 to now, he has been studying for a master's degree at the School of Mechanical and Electrical Engineering of Southwest Petroleum University;Yongbo Shao, professor, Ph.D. supervisor. Bachelor's degree and master's degree from department of engineering mechanics, Tsinghua University. In 2005, he graduated from NTU (Nanyang Technological University) in Singapore with a doctorate. In 2015, he was appointed as the special expert of Thousand Talents Program of Sichuan Province, and in 2017, he was awarded the title of outstanding expert with outstanding contributions in Sichuan Province. He has been engaged in the teaching and research of structural engineering, Marine enginee-ring steel structure and mechanical strength theory, focusing on the research of fatigue fracture, earthquake resistance, fire resistance, impact resistance, structural safety evaluation and maintenance and reinforcement of steel structures. He has published more than 130 scientific papers, including 52 SCI papers, and cited over 600 papers. He was awarded one third prize for scientific and technological progress in Sichuan Province, one third prize for Natural Science in Shandong Province, one second prize for scientific and technological progress in petrochemical and automation industries in China, two se-cond prizes for scientific and technological progress in marine engineering in China, and two prizes for best papers in international conferences. Organized and held two international conferences as the president of the conference, and was invited to give keynote speech at international conferences eight times successively. |
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