安装工况对NiTi合金垫片螺栓法兰连接接头密封性能的影响
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摘要
NiTi合金具有优异的形状记忆效应和超弹性效应,是制备新一代金属密封垫片的理想材料。采用有限元分析软件ABAQUS研究了安装工况对法兰密封连接接头密封性能的影响,并将计算结果和20#钢金属垫片作对比。结果表明:与仅考虑NiTi合金超弹性效应相比,考虑NiTi合金形状记忆效应,可使垫片接触应力提高17.4%;在介质内压、端部载荷作用下,NiTi合金垫片接触应力降低了5%,20#钢金属垫片降低了9%。说明NiTi合金作为密封垫片,在Ms温度下安装,Af温度以上使用的条件下,其密封性能要优于20#钢垫片,可有效的提高法兰螺栓连接接头的密封性能。
NiTi alloy was the perfect materials as the metal gasket with excellent shape memory effect and super elasticity effects.The ABAQUS was employed to investigate the impact of assembly process on seal performance of bolt flange joint. And the calculation results were compared with the mild steel gasket. The results illustrated that the gasket contact stress could raise the17.4%,when the shape memory of NiTi alloy was considered. During the course of normal use,contact stress of NiTi alloy gasket was reduced 5%,the 20# metal gasket was reduced 9%.It shows NiTi alloy could be used as gasket,its sealing property was better than 20# metal gasket when the assembly temperature was below Ms and higher than Af.
NiTi alloy was the perfect materials as the metal gasket with excellent shape memory effect and super elasticity effects.The ABAQUS was employed to investigate the impact of assembly process on seal performance of bolt flange joint. And the calculation results were compared with the mild steel gasket. The results illustrated that the gasket contact stress could raise the17.4%,when the shape memory of NiTi alloy was considered. During the course of normal use,contact stress of NiTi alloy gasket was reduced 5%,the 20# metal gasket was reduced 9%.It shows NiTi alloy could be used as gasket,its sealing property was better than 20# metal gasket when the assembly temperature was below Ms and higher than Af.
引文
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[4]Efremov A.High temperature negative creep gasket and manufacture same:US,Appl.No:12/319 206[P].2009.
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[6]潘家祯.压力容器材料实用手册[M].北京:化学工业出版社,2000:371-381.(Pan Jia-zhen.Practical Manual of Pressure Vessel Materials[M].Beijing:Chemical Industry Press,2000:371-381.)
[7]冯秀.金属垫片有效密封宽度有限元分析[J].流体机械,2008,36(9):45-49.(Feng Xiu.Finite element analysis for the metallic gasket effective width[J].Fulid Machinery,2008,36(9):45-49.)
[8]刘路维.Ni Ti合金薄板压缩状态下相变及力学行为的研究[D].南京:南京工业大学,2015:70-74.(Liu Lu-wei.Research on phase transformation and mechanical behavior of Ni Ti alloy sheet under compression[D].Nanjing:Nanjing Tech University,2015:70-74.)
[9]杜坤.基于螺栓法兰连接系统的垫片应力分析[J].机械设计与制造,2013(5):88-91.(Du Kun.Gasket stress analysis based on bolt flange connection system[J].Machinery Design&Manufacture,2013(5):88-91.)
[10]诸士春.Ni Ti合金压缩超弹性性能研究及其在法兰连接中的应用[D].南京:南京工业大学,2012:96-97.(Zhu Shi-chun.Study on the compressive super-elasticity of Ni Ti alloy and its application in flange joints[D].Nanjing:Nanjing Tech University.2012:96-97.)
[2]Efremov A.Negative creep gasket with core of shape memory alloy:US,Appl.No.:11/405 722[P].2007.
[3]Efremov A.Method to limit a creep of bolts and gaskets of bolted flanged connections:US,Appl.No:12/148 800[P].2008.
[4]Efremov A.High temperature negative creep gasket and manufacture same:US,Appl.No:12/319 206[P].2009.
[5]诸士春,陆晓峰,巩建鸣.Ni Ti合金密封垫片压紧力分布有限元分析[J].南京工业大学学报.2012,34(4):33-39.(Zhu Shi-chun,Lu xiao-feng,Gong Jian-ming.Finite element analysis on contact stress distribution of Ni Ti alloy sealing gasket[J].Journal of Nanjing University of Technology,2012,34(4):33-39.)
[6]潘家祯.压力容器材料实用手册[M].北京:化学工业出版社,2000:371-381.(Pan Jia-zhen.Practical Manual of Pressure Vessel Materials[M].Beijing:Chemical Industry Press,2000:371-381.)
[7]冯秀.金属垫片有效密封宽度有限元分析[J].流体机械,2008,36(9):45-49.(Feng Xiu.Finite element analysis for the metallic gasket effective width[J].Fulid Machinery,2008,36(9):45-49.)
[8]刘路维.Ni Ti合金薄板压缩状态下相变及力学行为的研究[D].南京:南京工业大学,2015:70-74.(Liu Lu-wei.Research on phase transformation and mechanical behavior of Ni Ti alloy sheet under compression[D].Nanjing:Nanjing Tech University,2015:70-74.)
[9]杜坤.基于螺栓法兰连接系统的垫片应力分析[J].机械设计与制造,2013(5):88-91.(Du Kun.Gasket stress analysis based on bolt flange connection system[J].Machinery Design&Manufacture,2013(5):88-91.)
[10]诸士春.Ni Ti合金压缩超弹性性能研究及其在法兰连接中的应用[D].南京:南京工业大学,2012:96-97.(Zhu Shi-chun.Study on the compressive super-elasticity of Ni Ti alloy and its application in flange joints[D].Nanjing:Nanjing Tech University.2012:96-97.)