摘要
基于Hertz接触应力和Mises屈服准则建立了考虑密封面附加作用扭矩的特殊螺纹球面对锥面密封结构的弹塑性接触应力理论模型,研究了密封面附加作用扭矩对密封面接触应力分布的影响规律。结果表明:随密封面附加作用扭矩的增加,密封面接触状态逐渐从完全弹性接触转变为弹塑性接触,接触应力分布逐渐由开口向下的抛物线向抛物线杯形转变,且接触宽度、屈服宽度和平均接触应力均逐渐增大。为提高特殊螺纹气密封性能,既要保证密封面具有足够的平均接触应力和接触宽度,又要合理控制屈服宽度,实例中建议将密封面附加上扣扭矩控制在731.7N·m~1826.4N·m范围内。研究结果对指导特殊螺纹合理上扣、提高螺纹气密封性能具有重要意义。
Considering additional make-up torque from sealing interface,the elastic-plastic contact stress analytical model for sphere to cone premium connection is established on the basis of Hertz contact stress and Mises yield criterion.The effects of additional make-up torque from sealing interface on the contact stress distribution are analyzed.The results show that with the additional make-up torque from sealing interface increases,sealing interface contact state gradually shifts from completely elastic contact to elastic-plastic contact,the contact stress distribution by gradually opening downward parabola to parabolic cup,and the contact width,yield width and average contact stress all increase.In order to improve the gas sealing performance of premium connection,the sufficient average contact stress and contact width should be ensured and the yield width also reasonably controlled.In the example,the additional make-up torque from sealing interface should be controlled between 731.7N·m and 1826.4N·m.The results are of great significance for guiding the make-up torque operation and improving the gas sealing performance for premium connection.
作者
许红林
杨斌
张智
施太和
Xu Honglin;Yang Bin;Zhang Zhi;Shi Taihe(School of Petroleum and Natural Gas Engineering,Chongqing University of Science&Technology,401331,Chongqing,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,610500,Chengdu,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2021年第3期1258-1263,共6页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51804060)
重庆市自然科学基金(cstc2018jcyjAX0614)
重庆市教委科学技术研究项目(KJQN201901519)
四川省青年科技创新研究团队项目(2020JDTD0016)。
关键词
特殊螺纹
球面对锥面
密封
弹塑性
接触应力
premium connection
sphere to cone
sealing
elastic-plastic
contact stress
