海底悬跨管道表面裂纹应力强度因子分析
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摘要
为了分析海底悬跨油气管道外表面环向裂纹应力强度因子在不同载荷条件下的变化情况,以X60管道为研究对象,采用ABAQUS有限元软件与1/4节点位移法,通过改变管道悬跨长度、海流速度、裂纹形状等参数大小,分析各参数变化对裂纹应力强度因子的影响,得到了应力强度因子的变化规律;通过改变管道内压波动幅值并应用Paris应力强度因子理论,分析了压力波动对裂纹应力强度因子的影响,得到了应力强度因子幅度值的变化规律以及能确保管道安全运行的压力波动范围;结果显示:裂纹深度越大,应力强度因子极大值位置将在裂纹形状越小时发生改变;压力波动范围越广,对管道影响越大,裂纹扩展速度越快。
To analyze the variation of the stress intensity factor of the circumferential cracks on the outer surface of free spanning submarine oil and gas pipelines with different loading conditions,the X60 pipeline was taken as the research object,and the ABAQUS finite element software and 1/4-node displacement method were used,by changing the parameters such as pipeline span length,current velocity and crack shape,the influence of various parameters on crack stress intensity factor was analyzed,and the variation law of stress intensity factor was obtained. By changing the internal pressure fluctuation amplitude and applying Paris stress intensity factor theory,the influence of pressure fluctuation on the crack stress intensity factor was analyzed. The variation law of the amplitude of the stress intensity factor and the pressure fluctuation range that can ensure the safe operation of the pipeline were obtained. The results show that the larger the crack depth is,the position of the maximum value of the stress intensity factor changes when the smaller the crack shape is; the wider the pressure fluctuation range is,the greater the influence on the pipeline is,and the faster the crack propagation speed is.
To analyze the variation of the stress intensity factor of the circumferential cracks on the outer surface of free spanning submarine oil and gas pipelines with different loading conditions,the X60 pipeline was taken as the research object,and the ABAQUS finite element software and 1/4-node displacement method were used,by changing the parameters such as pipeline span length,current velocity and crack shape,the influence of various parameters on crack stress intensity factor was analyzed,and the variation law of stress intensity factor was obtained. By changing the internal pressure fluctuation amplitude and applying Paris stress intensity factor theory,the influence of pressure fluctuation on the crack stress intensity factor was analyzed. The variation law of the amplitude of the stress intensity factor and the pressure fluctuation range that can ensure the safe operation of the pipeline were obtained. The results show that the larger the crack depth is,the position of the maximum value of the stress intensity factor changes when the smaller the crack shape is; the wider the pressure fluctuation range is,the greater the influence on the pipeline is,and the faster the crack propagation speed is.
引文
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[2]ZAREEI A,NABAVI S.Calculation of stress intensity factors for circumferential semi-elliptical cracks with high aspect ratio in pipes[J].International Journal of Pressure Vessels and Piping,2016,146:32-38.
[3]倪扬,马廷霞,刘维洋.基于ABAQUS的X80压力管道裂纹扩展研究[J].塑性工程学报,2018,25(3):261-266.NI Yang,MA Tingxia,LIU Weiyang.Study on crack propagation in X80 pressure pipe based on ABAQUS[J].Journal of Plasticity Engineering,2018,25(3):261-266.
[4]何雪,秦晓峰,谢里阳,等.管道轴向双裂纹夹角对尖端应力强度因子的影响[J].东北大学学报(自然科学版),2011,32(11):1623-1626.HE Xue,QIN Xiaofeng,XIE Liyang,et al.Influence of double axial cracks'angle on stress intensity factors of crack tip[J].Journal of Northeastern University(Natural Science),2011,32(11):1623-1626.
[5]梁光川,李杭杭,周军.裂纹倾角对管道表面裂纹断裂参数的影响[J].油气储运,2017,36(6):689-693.LIANG Guangchuan,LI Hanghang,ZHOU Jun.Effect of crack angle on the fracture parameter of pipeline surface crack[J].Oil&Gas Storage and Transportation,2017,36(6):689-693.
[6]李杰,秦太验.带环向表面裂纹海洋管道的断裂计算与可靠性评估[J].中国农业大学学报,2006,11(4):89-93.LI Jie,QIN Taiyan.Fracture and reliability assessment on submarine pipelines with circumferential surface cracks[J].Journal of China Agricultural University,2006,11(4):89-93.
[7]王爱勤,秦太验.含轴向表面裂纹海洋管道的应力强度因子分析[J].应用力学学报,2008,25(3):439-444.WANG Aiqin,QIN Taiyan.Stress intensity factor analysis for submarine pipelines with axial surface cracks[J].Chinese Journal of applied mechanics,2008,25(3):439-444.
[8]龙飞飞,张立,陈跃.水流作用下含单个裂纹悬空输油管道数值分析[J].大庆石油学院学报,2009,33(4):130-134.LONG Feifei,ZHANG Li,CHEN Yue.Numerical analysis of underwater suspended pipes with one crack flaw[J].Journal of Daqing Petroleum Institute,2009,33(4):130-134.
[9]刘悦,孟贺学.油气管道裂纹评价方法[J].油气储运,2010,29(9):660-663.LIU Yue,MENG Hexue.Crack evaluation method of oil&gas pipelines[J].Oil&Gas Storage and Transportation,2010,29(9):660-663.
[10]董蕙茹,郭万林,杨政,等.X60管线钢非穿透裂纹体的断裂研究[J].金属学报,2001,37(6):579-584.DONG Huiru,GUO Wanlin,YANG Zheng,et al.Study on facture of non-through crack bodies of X60 pipeline steel[J].Acta Metallurgica Sinica,2001,37(6):579-584.
[11]潘勇琨,冯耀荣,庄传晶,等.含缺陷油气管道剩余疲劳寿命的预测[J].石油机械,2001,29(8):4-7.PAN Yongkun,FENG Yaorong,ZHUANG Chuanjing,et al.Prediction of residual fatigue life of defective oil and gas pipelines[J].Petroleum Machinery,2001,29(8):4-7.
[12]NEWMAN J C,RAJU I S.An empirical stress-intensity factor equation for the surface crack[J].Engineering Fracture Mechanics,1981,15(1):185-192.
[13]邱保文,袁泽喜,周桂峰.油气管线裂纹型缺陷的疲劳寿命预测[J].武汉科技大学学报,2009,32(3):247-250.QIU Baowen,YUAN Zexi,ZHOU Guifeng.Fatigue life prediction of crack-type defects in oil and gas pipelines[J].Journal of Wuhan University of Science and Technology,2009,32(3):247-250.
[14]刁顺,冯耀荣,庄传晶,等.几种油气输送管材料的疲劳特性与管道寿命预测[J].中国安全科学学报,2008,18(1):123-131.DIAO Shun,FENG Yaorong,ZHUANG Chuanjing,et al.Study on the fatigue properties of oil gas pipeline and its prediction of service life[J].China Safety Science Journal,2008,18(1):123-131.
[15]帅健.管线力学[M].北京:科学出版社,2010.SHUAI Jian.Pipeline mechanics[M].Beijing:Science Press,2010.
[16]方华灿.油气长输管线的安全可靠性分析[M].北京:石油工业出版社,2002.FANG Huacan.Analysis of the safety and reliability of long-distance oil and gas pipelines[M].Beijing:Petroleum Industry Press,2002.
[17]伍颖.断裂与疲劳[M].武汉:中国地质大学出版社,2008.WU Ying.Fracture and fatigue[M].Wuhan:China University of Geosciences Press,2008.
[18]张晓敏,万玲,严波,等.断裂力学[M].北京:清华大学出版社,2012.ZHANG Xiaomin,WAN Ling,YAN Bo,et al.Fracture mechanics[M].Beijing:Tsinghua University Press,2012.