摘要
油气管道输送介质具有易燃、易爆特性,运营风险高,特别是管道环焊缝出现裂纹的危害更大,在疲劳应力的作用下易发生事故。本文针对某长输管道内检测中环焊缝根部裂纹,建立有限元模型,采用SMAW单V型坡口形式,对环焊缝裂纹尖端网格进行局部加密处理,建立了裂纹扩展驱动力CTOD随轴向载荷的变化模型,得到了管道在相应轴向应力水平下不同裂纹尺寸对应的CTOD值,基于BS 7910以及SY/T 6477关于CTOD与应力强度因子K以及夏比冲击功的经验公式,得到了对应的夏比冲击功,通过我国管道材料CTOD值和夏比冲击功数值的综合判断,可得出管道处于安全状态的结论,对于管道环焊缝根部裂纹缺陷的精准评估具有重要意义。
The transmission medium of oil and gas pipeline has inflammable and explosive characteristics, and the operation risk is high,especially the crack of the pipeline girth weld is more harmful, and the accident is easy to occur under the action offatigue stress. In this paper, a finite element model was established to detect the root crack of the girth weld in a long distance pipeline. The SMAW single V groove form was adopted to perform local encryption on the crack tip grid of the girth weld. The change model of the crack growth driving force CTOD with the axial load was established, and the corresponding CTOD values of different crack sizes under the axial stress level were obtained. Based on the empirical formulas of BS 7910 and SY/T 6477 about CTOD, stress intensity factor and Charpy impact energy, the corresponding Charpy impact energy is obtained. Through the comprehensive judgment of CTOD value and Charpy impact energy value of Chinese pipeline materials, the conclusion of pipeline safety can be drawn. It is of great significance to accurately evaluate the root crack defects of girth welds.
作者
张神良
何玉龙
毕玉龙
张轶男
魏昊天
王路明
Zhang Shenliang;He Yulong;Bi Yulong;Zhang Yinan;Wei Haotian;Wang Luming(Anhui Gas Development Co.,Ltd.,Anhui,230051;College of Safety and Ocean Engineering,China University of Petroleum(Beijing),Beijing,102249)
出处
《当代化工研究》
2023年第2期129-131,共3页
Modern Chemical Research
关键词
管道环焊缝
有限元模型
CTOD
夏比冲击功
pipe girth weld
finite element model
crack tip opening displacement
charpy impact energy
