钢丝增强柔性管在内压和温差作用下的受力分析
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摘要
研究了一种由内层、增强层和外保护层构成的三层结构的钢丝增强柔性复合管在内压和温差作用下的受力问题,认为因钢丝能承受的应变远小于PE材料能承受的应变,故钢丝增强柔性管的极限承载力应以钢丝的拉断为标准。从理论上推导了钢丝增强柔性管中钢丝轴向应变公式,同时采用ABAQUS有限元软件建立内压温差载荷下模型。研究结果表明,在一定内压及温差作用下,最外层钢丝最先遭到破坏;通过提取管道中最外层钢丝轴向应变,并与理论公式计算结果比对,二者的吻合度高,说明本文的理论公式完全可用于计算钢丝增强柔性管中钢丝的轴向应变。
The stress of a steel wire reinforced flexible composite pipe composed of inner layer,reinforcement layer and outer protective layer under the action of internal pressure and temperature difference is studied.It is held that because the strain bearable by steel wire is far less than that bearable by PE material,the ultimate load bearing capacity of steel wire reinforced flexible pipe should be based on the criterion of steel wire breaking.The axial strain formula of the steel wire reinforced flexible pipe was deduced theoretically,and the model of it under the action of internal pressure and temperature difference is established by ABAQUS finite element software.The research results show that the outermost steel wire is first destroyed under certain internal pressure and temperature difference.Compared the actual axial strain of the outermost steel wire in the pipeline with the calculated axial strain using the theoretical formula,the agreement between them is high,which shows that the theoretical formula in this paper can be used to calculate the axial strain of the steel wire in the steel wire reinforced flexible pipe.
The stress of a steel wire reinforced flexible composite pipe composed of inner layer,reinforcement layer and outer protective layer under the action of internal pressure and temperature difference is studied.It is held that because the strain bearable by steel wire is far less than that bearable by PE material,the ultimate load bearing capacity of steel wire reinforced flexible pipe should be based on the criterion of steel wire breaking.The axial strain formula of the steel wire reinforced flexible pipe was deduced theoretically,and the model of it under the action of internal pressure and temperature difference is established by ABAQUS finite element software.The research results show that the outermost steel wire is first destroyed under certain internal pressure and temperature difference.Compared the actual axial strain of the outermost steel wire in the pipeline with the calculated axial strain using the theoretical formula,the agreement between them is high,which shows that the theoretical formula in this paper can be used to calculate the axial strain of the steel wire in the steel wire reinforced flexible pipe.
引文
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[15] KOO J M,CHOI J H,SEOK C S.Prediction of post-impact residual strength and fatigue characteristics after impact of CFRP composite structures[J].Composites Part B:Engineering,2014,61:300-306.
[16] WOGHIREN C O,BRENNAN F P.Weld toe stress concentrations in multi-planar stiffened tubular KK joints[J].International Journal of Fatigue,2009,31(1):164-172.
[17] ARJOMANDI K,TAHERI F.Bending capacity of sandwich pipes[J].Ocean Engineering,2012,48:17-31.
[2] 钱兴坤,姜学峰.2015年国内外油气行业发展概述及2016年展望[J].国际石油经济,2016(1):27-35.QIAN Xingkun,JIANG Xuefeng.Overview of the development of domestic and international oil and gas industry in 2015 and outlook for 2016[J].International Petroleum Economics,2016(1):27-35.
[3] 熊海超.弯曲-外压下钢丝缠绕增强复合管的力学分析[J].低温建筑技术,2016(1):34-36.XIONG Haichao.Mechanical analysis of steel wire wound reinforced composite pipe under bending-external pressure[J].Low Temperature Architecture Technology,2016(1):34-36.
[4] 陈斌,杨虹,胡学文.钢骨架聚乙烯塑料复合管在较高温度下使用的讨论[J].化工设备与管道,2010,47(2):49-52.CHEN Bin,YANG Hong,HU Xuewen.Discussion on the use of steel skeleton polyethylene plastic composite pipe at higher temperature[J].Process Equipment & Piping,2010,47(2):49-52.
[5] 乔霭潼.纤维缠绕增强复合管在内压作用下的力学行为研究[D].杭州:浙江大学,2014.QIAO Aitong.Study on Mechanical Behavior of Filament Wound Reinforced Composite Pipe under Internal Pressure[D].Hangzhou:Zhejiang University,2014.
[6] 林珊颖.玻璃纤维增强软管力学性能研究[D].哈尔滨:哈尔滨工程大学,2017.LIN Shanying.Study on Mechanical Properties of Glass Fiber Reinforced Pipe[D].Harbin:Harbin Engineering University,2017.
[7] BAI Y,CHEN W,XIONG H,et al.Analysis of steel strip reinforced thermoplastic pipe under internal pressure[J].Ships and Offshore Structures,2016,11(7):766-773.
[8] GIBSON A G,LINDEN J M,ELDER D,et al.Non-metallic pipe systems foruse in oil and gas[J].Plastics,Rubber and Composites,2011,40(10):465-480.
[9] LI G H,WANG W J,JING Z J,et al.Experimental study and finite element analysis of critical stresses of reinforced thermoplastic pipes under various loads[J].Strength of Materials,2016,48(1):165-172.
[10] 林珊颖,白勇,马刚,等钢带软管内压和弯曲研究[J].船舶力学,2016(12):1595-1603.LIN Shanying,BAI Yong,MA Gang,et al.Research on internal pressure and bending of steel pipe[J].Journal of Ship Mechanics,2016(12):1595-1603.
[11] 王国华,熊继有,薛亮.管内压力变化速率对套管强度的影响规律研究[J].西南石油大学学报(自然科学版),2011,40(6):105-108.WANG Guohua,XIONG Jiyou,XUE Liang.Study on the influence law of pressure change rate in tube on casing strength[J].Journal of Southwest Petroleum University(Science & Technology Edition),2011,40(6):105-108.
[12] GONG S F,YUAN L,JIN W L.Buckling response of offshore pipelines under combined tension,bending,and external pressure[J].Journal of Zhejiang University Science A,2011(12):627- 36.
[13] VASILIKIS D,KARAMANOS S A.Buckling design of confined steel cylinders under external pressure[J].Journal of Pressure Vessel Technology,2011,133(1):331-342.
[14] VASILIKIS D,KARAMANOS S A.Mechanics of confined thin-walled cylinders subjected to external pressure[J].Applied Mechanics Reviews,2014,66(1):1001-1016.
[15] KOO J M,CHOI J H,SEOK C S.Prediction of post-impact residual strength and fatigue characteristics after impact of CFRP composite structures[J].Composites Part B:Engineering,2014,61:300-306.
[16] WOGHIREN C O,BRENNAN F P.Weld toe stress concentrations in multi-planar stiffened tubular KK joints[J].International Journal of Fatigue,2009,31(1):164-172.
[17] ARJOMANDI K,TAHERI F.Bending capacity of sandwich pipes[J].Ocean Engineering,2012,48:17-31.