中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (3): 66-72.doi: 10.16265/j.cnki.issn1003-3033.2021.03.010

• 安全工程技术 • 上一篇    下一篇

外力作用下管道内表面缺陷处裂纹扩展研究

朱豪豪, 郭海林 副教授, ZHUMAKELDI A   

  1. 中国地质大学武汉 工程学院,湖北 武汉 430074
  • 收稿日期:2020-12-07 修回日期:2020-02-05 出版日期:2021-03-28 发布日期:2021-12-20
  • 作者简介:朱豪豪 (1995—),男,河南新蔡人,硕士研究生,研究方向为安全监测与检测及石油化工行业安全管理和风险控制。E-mail: hh_z2018@163.com。
  • 基金资助:
    湖北省安全生产科技专项资金资助。

Research on crack propagation of pipeline inner surface defect under external force

ZHU Haohao, GUO Hailin, ZHUMAKELDI A   

  1. Faculty of Engineering,China University of Geosciences Wuhan, Wuhan Hubei 430074,China
  • Received:2020-12-07 Revised:2020-02-05 Online:2021-03-28 Published:2021-12-20

摘要: 为提高油气管道安全风险评估的准确性,以含内表面缺陷管道为研究对象,利用ABAQUS软件线弹性及弹塑性分析不同尺寸缺陷对裂纹萌生特征的影响;采用扩展有限元法,建立管道3点弯曲模型与全尺寸静载物理试验,并非线性拟合裂纹扩展尺寸,研究内表面缺陷处裂纹扩展情况。研究结果表明:内表面缺陷中心处极易萌生裂纹,随着缺陷尺寸的增大,裂纹萌生所需外力在缺陷相对长度为0.08、相对深度为0.4时的增长趋势变化较大,且缺陷深度对裂纹萌生的影响更大;对比数值模拟与全尺寸物理试验,发现在小于70 mm位移载荷或147.25 kN外力下裂纹尺寸快速扩展,之后呈变缓的趋势;非线性拟合裂纹尺寸,得到较为准确的裂纹扩展尺寸的预测结果。

关键词: 外力作用, 内表面缺陷, 裂纹扩展, 数值模拟, 全尺寸物理试验, 油气管道

Abstract: In order to improve accuracy of pipeline safety risk assessment, taking pipeline with internal surface defects as research object, influence of different size defects on crack initiation law was analyzed by using ABAQUS software linear elastic and elastic-plastic,3-point bending model of pipeline and full-scale static load physical test were established by using extended finite element method, and nonlinear fitting of crack growth size was used to study crack propagation at the inner surface defects. The results show that crack initiation is very easy at the center of inner surface defect.As the size of the defect increases, the external force required for crack initiation changes greatly when the relative length of the defect is 0.08 and the relative depth is 0.4,and influence of defect depth on crack initiation is greater. Comparison between numerical simulation and full-scale physical test shows that crack size rapidly expands under displacement load of less than 70 mm or external force of 147.25 kN, and then nonlinear fitting of crack size can obtain more accurate prediction results of crack growth size.

Key words: external force, inner surface defects, crack propagation, numerical simulation, physical test of full scale pipe, oil and gas pipeline

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