中国舰船研究2024，Vol.19Issue(3)：302-309,8.DOI:10.19693/j.issn.1673-3185.03650
基于断裂相场法的管道环向表面裂纹扩展研究
Fracture phase-field method-based circumferential surface crack propagation investigation of pipeline
摘要
Abstract
[Objective]This study aims to deeply investigate the influence of different initial circumferen-tial surface crack shapes(elliptical and sectoral)on pipeline crack propagation behavior under axial forces,thereby providing theoretical support for the structural integrity safety of offshore structures.[Methods]The crack propagation process is simulated and analyzed using the phase field method,and cracks are repres-ented in a diffused manner through a continuous field function.Relying on the Francfort-Marigo variational principle,fracture energy is integrated into the total potential energy of the system.A degradation function is introduced to quantify the reduction of strain energy caused by damage.Secondary development is conducted in finite element software ABAQUS,and the staggered solution strategy is used to solve the problem of pipe crack propagation.[Results]The results show that when the depth of an elliptical circumferential surface crack is less than half the wall thickness,the crack first propagates circumferentially,then extends through the wall thickness until penetration occurs.When the extent of the elliptical crack penetration is larger,the crack first extends through the wall thickness until penetration,then propagates circumferentially.Sectoral cracks tend to penetrate through the wall thickness first,followed by circumferential expansion.[Conclusions]The results of this study indicate that the fracture phase-field method can accurately simulate the local evolution process of cracks in pipes and highlights the impact of the initial crack shape and the extent of crack penetra-tion on the structural integrity of pipes under the action of axial forces.This has significant implications for en-hancing the safety and reliability of pipeline structures.关键词
管道/裂纹扩展/断裂相场法/断裂力学Key words
pipeline/crack propagation/phase-field fracture method/fracture mechanics分类
交通工程引用本文复制引用
邱康,杜鹏,魏羲,屈泱泱,陈念众..基于断裂相场法的管道环向表面裂纹扩展研究[J].中国舰船研究,2024,19(3):302-309,8.基金项目
国家自然科学基金面上项目资助(52071235) （52071235）
