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
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
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 GⅠat 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.
Sun Z L, Chai X D, Liu X X,et al. Material Reports B:Research Papers, 2017, 31(4), 130 (in Chinese).孙志礼, 柴小冬, 柳溪溪, 等. 材料导报:研究篇, 2017, 31(4), 130.2 Xiao Z M, Yan J, Chen B J. Acta Mechanica, 2004, 171(1-2), 29.3 Li L, Yang Y H, Xu Z, et al. Fatigue & Fracture of Engineering Mate-rials & Structures, 2015, 37(10), 1124.4 Sheng Y, Zhu X L, Zeng X G,et al. Material Reports B:Research Papers, 2019, 33(7), 2419 (in Chinese).盛鹰, 朱星亮, 曾祥国, 等. 材料导报:研究篇, 2019, 33(7), 2419.5 Kumar S, Singh I V, Mishra B K. Computers & Structures, 2015, 150, 1.6 Bouhala L, Shao Q, Koutsawa Y, et al. Engineering Fracture Mechanics, 2013, 102(4), 51.7 Zheng H, Xu D D. International Journal for Numerical Methods in Engineering, 2014, 97(13), 986.8 Zhang H H, Li L X, An X M. Engineering Analysis with Boundary Elements, 2010, 34(1), 41.9 Ma G W, An X M, Zhang H H, et al. International Journal of Fracture, 2009, 156(1), 21.10 Farkash E, Banks-Sills L. International Journal of Fracture, 2017, 205(2), 189.11 Shokrieh M M, Rajabpour-Shirazi H, Heidari-Rarani, et al. Computational Materials Science, 2012, 65(12), 66.12 Xie D, Biggers S B. Finite Elements in Analysis and Design, 2006, 42(11), 977.13 Krueger R. Applied Mechanics Reviews, 2004, 57(1), 109.14 Cui W, Zhang Y H, Zhang Q, et al. Material Reports B:Research Papers, 2019, 33(3), 1036. (in Chinese).崔巍, 张煜杭, 张强, 等. 材料导报:研究篇, 2019, 33(3), 1036.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2020, Vol. 34 
