Elastic-plastic Numerical Simulation and Experimental Research on the Sealing Structure of Special Threaded Joints
The thickness of the pipe end and the"black crested thread"during the special thread machining of thin-walled casing were two of the factors that affect the strength of the thread connection and machining efficiency.This paper applied the finite element software ABAQUS to conduct elastic-plastic analysis on the sealing performance of thin-walled casing special threaded joint with pipe end necking and non necking,as well as adjustment of pitch diameter position.The corresponding relationship between the structure before and after op-timizing the pitch diameter position as well as the shrinkage process and the contact pressure of the sealing surface was established under dif-ferent composite load conditions.The results showed that after make-up,there was not much difference in contact pressure before and after structural optimization.When compressed,the maximum contact stress on the optimized structural sealing surface decreased,the contact length increased,and the stress at each point on the entire sealing surface tended to be flat.During stretching,the optimized structural seal-ing surface showed an increase in contact stress,uniform distribution,increased contact length,and relatively better tensile performance.The maximum contact stress after necking was equivalent to that without necking,but the contact length increased,reducing the risk of leak-age.The experiment results verified that the optimized structure being necked improved the processing yield of the pipe body and ensured the gas sealing performance and thread connection strength,which was consistent with the simulation results.
special threaded jointsealing surfacefinite element methodshoulder structureexperimental research
万方数据
维普
