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《Materials Reports》 2019-06
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A Fluid-solid-magnetic Coupling Method for the Crack Growth in Pipe Welds Considering the Fluid Permeation Pressure

CUI Wei;ZHANG Yuhang;ZHANG Qiang;FENG Ziming;College of Mechanical Science and Engineering,Northeast Petroleum University;  
Aiming at detecting the dynamic crack growth in the weld of the in-service pipeline by magnetic flux leakage method,a fluid-solid-magnetic coupling method considering the fluid permeation pressure was proposed. Through establishing the fluid-solid-magnetic field model in pipeline weld,the coupling equation of fluid-solid magnetic multi-field could be constructed,and the crack propagation in pipeline weld could be calculated,which contribute to the mesh reconstruction around the cracks and the analysis of the leakage magnetic field in the process of crack propagation in the pipeline weld. The results indicated that the the process of internal crack growth was accelerated by the fluid osmotic pressure. The pipe welds considering the fluid permeation pressure were threatened by more serious danger than that without the fluid permeation pressure. Meanwhile,the fluid-solid-magnetic multi-field coupling method considering the fluid permeation pressure was more suitable for the practical engineering,which could accurately characterize the degree of the crack growth in pipe welds,judge the dangerous grade of the weld damage in pipelines. And it has provided a more effective way for characterization and evaluation of the crack growth in pipe welds under fluid-solid magnetic multi-field coupling condition.
【Fund】: 国家自然科学基金(51607035;11502051;51774091;51674090);; 黑龙江省普通本科高等学校青年创新人才(UNPYSCT-2018046);; 中国博士后科学基金(2018M641804);; 黑龙江省博士后科研启动金(LBH-Q18029)~~
【CateGory Index】: TE973.6
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