特殊油管扣螺纹参数对接头连接强度影响分析  

Analysis of Influence of Thread Parameters on Ioint Strength of Premium Connections

作　　者：秦彦斌[1] 张佳浩 于洋[1] Qin Yanbin;Zhang Jiahao;Yu Yang(School of Mechanical Engineering,Xi′an Shiyou University,Xi′an 710065,China)

机构地区：[1]西安石油大学机械工程学院,西安710065

出　　处：《机电工程技术》2021年第4期113-115,共3页Mechanical & Electrical Engineering Technology

摘　　要：为了明确特殊油管扣在使用过程中螺纹牙处的应力变化情况,建立了考虑螺旋升角的特殊油管扣的有限元模型,研究了不同的承载面和导向面对接头螺纹的Mises等效应力影响。结果表明,复合载荷作用时,整个螺纹牙部分的等效应力会随承载面角度的增大而先减小后增大,当承载面角度为-4°、-3°和3°时,螺纹处的等效应力较小,且沿螺纹牙分布较为均匀。螺纹部分的等效应力随螺纹牙导向面角度的增大而减小,导向面角度大于20°时,螺纹牙应力大幅减小,导致台肩处应力增大,螺纹牙的连接强度降低;导向面处于10°~25°时,等效应力沿螺纹牙分布均匀,特殊扣螺纹段连接性能较好。研究结果对接头螺纹牙的设计具有一定的参考意义。Aiming at the problem of threaded connection failure of premium connections,a three-dimensional finite element model of premium connections was established,and the effect of stress on the joint threads under the action of make-up torque and axial load was studied.The results show that the equivalent stress of the whole thread will decrease first and then increase with the increase of bearing surface angle when the load surface angle is-4°,-3°and 3°.The mises equivalent stress of the thread is small when the bearing surface angle is-4°,-3°and 3°,and the distribution along the thread teeth is more uniform.As the angle of the thread guide surface increases,the stress at the thread first increases and then decreases.When the guide surface angle is greater than 20°,the unevenness of the stress distribution at the thread increases,resulting in an increase in the stress at the shoulder,the sealing performance and connection strength are reduced;when the angle of the guide surface is 10°~25°,the thread equivalent stress is more evenly distributed along the thread teeth,and is less than the material yield limit,and the thread connection performance is better.The research results have certain reference significance for the design of premium connections.

关 键 词：特殊油管扣 承载面 导向面 有限元分析 

分 类 号：TE931[石油与天然气工程—石油机械设备]