| METAIS AND METAL MATRIX COMPOSITES |
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| Multi-field Coupling Numerical Simulation Method for Interference Effect of Double Cracks in X80 Oil and Gas Pipeline Weld |
| CUI Wei1,2, SONG Rixuan1, XIAO Zhongmin2, FENG Ziming1, LENG Decheng3, DONG Kangxing1, ZHANG Qiang1, YANG Zhijun1
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1 School of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,China
2 School of Mechanical and Aerospace Engineering,Nanyang Technological University,Singapore 639798
3 Fertilizer Plant,Daqing Petrochemical Company,Daqing 163714,China |
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Abstract Based on the theory of magnetic flux leakage (MFL) method for detecting pipeline weld, a fluid-solid magnetic multi-field coupling method is proposed by applying the virtual crack closure technique (VCCT). Taking solving engineering problems as an example, because the cracks in actual pipelines mostly exist in the form of crack groups, this method is applied to study the crack propagation problems of co-linear double cracks and circumferentially symmetric double cracks of X80 pipeline weld. By dynamically applying fluid pressure load on the inner wall of pipeline weld, each time the crack incremental growth is completed, the mesh is reconstructed, and the characteristic parameters in the process of crack propagation, such as fluid pressure load P in pipeline, energy release rate GⅠ at crack tip, propagation length L, crack-tip-opening angle CTOA, magnetic induction component Bxp, are calculated. Crack propagation and magnetic field analysis are carried out cyclically. The numerical results show that the interference effect of collinear double cracks accelerate the process of crack propagation, and the process of crack propagation is accelerated when the distance between circular symmetric double cracks is large. When the annular distance is less than or equal to 0.5 times of the annular arc length of the weld, the existence of the double crack inhibits the growth of the crack due to the interference effect of the double crack. The realization of this method can provide theoretical basis for practical X80 pipeline safety evaluation.
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Published: 03 January 2020
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| About author:: Wei Cuireceived her Ph.D. degree in June 2013 from Northeast Petroleum University in engineering. She is currently an associate professor. She is mainly engaged in research on damage of ferromagnetic functional materials and integrity evaluation of oil and gas pipelines. She has hosted many projects such as Natural Science Foundation of China and China postdoctoral foundation, published more than 20 articles in domestic and foreign journals, and applied for more than 10 invention patents. |
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2020, Vol. 34 
