X60海底压力管道表面裂纹韧性扩展研究  

Research on toughness propagation of surface crack of X60 submarine pressure pipeline

作　　者：伍秋果 马廷霞[1] WU Qiu-guo;MA Ting-xia(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学机电工程学院,四川成都610500

出　　处：《塑性工程学报》2021年第8期189-194,共6页Journal of Plasticity Engineering

基　　金：西南石油大学科研“启航计划”项目(2018QHZ013)。

摘　　要：为了研究不同条件下管道表面裂纹的应力强度因子变化规律和扩展过程,以X60海底压力管道为研究对象,利用万能材料试验机得到X60管线钢的应力-应变曲线,采用ABAQUS有限元软件建立裂纹仿真模型,并利用管线力学公式进行验证,通过改变裂纹深径比、大小、位置以及海水流速,得到不同参数对裂纹应力强度因子的影响规律;利用扩展有限元法,对裂纹扩展过程进行动态分析,模拟裂纹扩展过程,并结合对应力强度因子的计算结果进行分析研究,总结了裂纹扩展的一般规律。结果表明:不同参数下,最大应力强度因子出现在裂纹最深处;非穿透性裂纹首先从裂纹尖端沿壁厚方向扩展,当深径比达到一定值后,再沿裂纹长度方向扩展。To study the variation law of stress intensity factor and the propagation process of pipeline surface cracks under different conditions,taking the X60 submarine pressure pipeline as research object,the stress-strain curve of X60 pipeline steel was obtained by universal material testing machine,crack simulation model was established by ABAQUS finite element software and verified by the pipeline mechanics formula,by changing the depth-diameter ratio,size,location of the crack and velocity of sea water,the influence of different parameters on the stress intensity factor of crack was obtained.The crack propagation process was dynamically analyzed by extended finite element method,the crack propagation process was simulated,the calculation results of stress intensity factor were analyzed and studied,and the general law of crack propagation was summarized.The results show that with different parameters,the maximum stress intensity factor appears at the deepest part of crack;non-penetrating cracks propagate firstly from the crack tip along the wall thickness direction,and propagate along the crack length direction after the depth-diameter ratio reaches a certain value.

关 键 词：压力管道 表面裂纹 应力强度因子 扩展有限元法 

分 类 号：X937[环境科学与工程—安全科学]