含热熔孔洞缺陷的埋地聚乙烯管道应力分析及寿命预测
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摘要
为了研究聚乙烯(PE)管道热熔孔洞缺陷与寿命之间的关系,基于Ansys软件对埋地状态下的含有热熔孔洞缺陷的PE管道进行应力分析,得到了含热熔孔洞缺陷的PE管道在不同内压下的最大Mises应力、环向应力和径向应力的变化数据;依据应力分析数据,使用Matlab编写程序,根据Suleiman双曲本构模型对PE管道进行了寿命预测。研究结果表明:含有热熔孔洞缺陷的PE管道,其最大应力随管道内压的增大而增大,寿命随着管道内压和缺陷体积的增大而减少,含缺陷管道寿命和内压关系可使用双对数函数来进行描述;使用应力分析和寿命预测相结合的方法,可以得到不同缺陷的PE管道寿命-内压关系式。
In order to study the relationship between defect of hot melt hole and life of the polyethylene( PE) pipe,the stress analysis was carried out on the buried PE pipe with the defect of hot melt hole by using Ansys software,and the variation data of the maximum Mises stress,hoop stress and radial stress for the PE pipe with the defect of hot melt hole under different internal pressures were obtained. Based on the data of stress analysis,the life prediction of PE pipe was conducted according to the Suleiman hyperbolic constitutive model through programming with Matlab. The results showed that the maximum stress of PE pipe with the defect of hot melt hole increased with the increase of pipe's internal pressure,while the life decreased with the increase of pipe's internal pressure and defect volume,and the relationship between life and internal pressure of the pipe with defect could be described by the double logarithmic function. The relational expression of life and internal pressure of the pipe with different defects could be obtained by using the combined method of stress analysis and life prediction.
In order to study the relationship between defect of hot melt hole and life of the polyethylene( PE) pipe,the stress analysis was carried out on the buried PE pipe with the defect of hot melt hole by using Ansys software,and the variation data of the maximum Mises stress,hoop stress and radial stress for the PE pipe with the defect of hot melt hole under different internal pressures were obtained. Based on the data of stress analysis,the life prediction of PE pipe was conducted according to the Suleiman hyperbolic constitutive model through programming with Matlab. The results showed that the maximum stress of PE pipe with the defect of hot melt hole increased with the increase of pipe's internal pressure,while the life decreased with the increase of pipe's internal pressure and defect volume,and the relationship between life and internal pressure of the pipe with defect could be described by the double logarithmic function. The relational expression of life and internal pressure of the pipe with different defects could be obtained by using the combined method of stress analysis and life prediction.
引文
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[2]朱志彬,陈丽静,杨晓翔,等.含球孔缺陷聚乙烯管道热熔接头力学性能分析[J].石油化工设备技术,2014,43(3):31-33.ZHU Zhibin,CHEN Lijing,YANG Xiaoxiang,et al. Mechanical properties analysis of polyethylene pipe hot melt connectors with ball hole crack[J]. Petrochemical equipment technology,2014,43(3):31-33.
[3]李明阳,陈国华.交通载荷作用下埋地聚乙烯燃气管道的有限元分析[J].塑料工业,2009,37(9):30-33.LI Mingyang,CHEN Guohua. Finite element analysis of buried polyethylene gas pipeline under traffic load[J]. Plastic industry,2009,37(9):30-33.
[4]郑津洋,鲁顺利,马津津,等.占压下埋地聚乙烯管力学响应的数值模拟[J].中国塑料,2014,28(1):60-64.ZHENG Jinyang,LU Shunli,MA Jinjin,et al. Numerical simulation of mechanical response of buried polyeth-ylene pipes under surface load[J]. Chinese plastic,2014,28(1):60-64.
[5]王金凤.椭圆体缺陷PE燃气管道受温度影响的力学特性研究[D].成都:西南石油大学,2012.
[6]徐成,徐平,施建峰,等.聚乙烯管韧性破坏寿命预测方法研究[J].压力容器,2012,29(1):1-6.XU Cheng,XU Ping,SHI Jianfeng,et al. Prediction of ductile rupture failure life of hdpe pipe[J]. Pressure vessel,2012,29(1):1-6.
[7]陈丽静,杨晓翔,朱志彬.基于Matlab的聚乙烯管韧性破坏的分析计算[J].化工机械,2013,40(2):218-219.CHEN Lijing,YANG Xiaoxiang,ZHU Zhibing. Analysis and calculation of toughness failure of polyethylene pipe based on matlab[J].Chemicalmachinery,2013,40(2):218-219.
[8]舒乐华.聚合物基复合材料粘弹性性能预测[D].湘潭:湘潭大学,2010.
[9]陈灵杰,陈国华.基于非线性黏弹性理论的含缺陷PE管的脆性破坏[J].塑料,2011,40(3):57-60.CHEN Lingjie,CHEN Guohua. Brittle failure of defective pipes based on nonlinear viscoelastic theory[J]. Plastic,2011,40(3):57-60.
[10]廖公云,黄晓明. ABAQUS有限元软件在道路工程中的应用[M].南京:东南大学出版社,2008:138.
[11]林少全,文巍伟.塑料管道的种类及选用原则[J].广东建材,2004(9):9-11.LIN Shaoquan,WEN Weiwei. Types of plastic pipes and selection principles[J]. Guangdong Building Materials,2004(9):9-11.
[12] NOOR M A,DHAR A S. New pipeline technologies,security,and safety-three-dimensional response of buried pipe under vehicle loads[C]//American Society of Civil Engineers Pipeline Engineering and Construction International Conference,July 13-16,2003,Baltimore,Maryland,United States. 2003.
[13]全国塑料制品标准化技术委员会.燃气用埋地聚乙烯(PE)管道系统第1部分:管材:GB/T 15558. 1-2015[S].北京:中国标准出版社,2015.
[14] ISO. Plastics piping and ducting systems—Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form byextrapolation:ISO 9080-2012[S]. ISO,2012.
[15] SULEIMAN M T,COREE B J. Constitutive model for high density polyethylene material:systematic approach[J]. Journal of Material in Civil Engineering,2004,11(12):511-515.