考虑应力松弛效应的球头-锥面密封性能分析

Performance analysis of globe-cone sealing considering stress relaxation effect

摘要:

建立了考虑应力松弛效应的球头-锥面密封有限元模型,并采用这一模型获得螺母残余预紧应力及球头-锥面间接触应力随蠕变时间的变化规律. 在此基础上,依据Roth提出的泄漏模型推导出考虑应力松弛效应下球头-锥面密封泄漏率的计算公式,并采用这一公式获得不同工况参数下考虑应力-松弛效应的球头-锥面密封泄漏率随蠕变时间的变化规律. 本文在球头-锥面密封性能分析中实现了应力松弛效应影响的嵌入,这一研究不仅有助于球头-锥面密封性能分析技术在其工程分析设计中的实用化,也在一定程度上对球头-锥面密封性能研究理论体系和方法有所完善.

Abstract:

When globe-cone sealing has long storage or working requirement, it is necessary to consider the effect of stress relaxation on the globe-cone seal performance. Based on this, a finite element model of globe-cone sealing considering stress relaxation is established, and the law of the nut residual preload force and the contact stress between globe and cone is obtained with increasing creep time by this model. Then the calculating formulas of globe-cone seal leakage rate are presented by the leakage model which is presented by Roth considering stress relaxation effect, and the law of leakage rate is obtained with increasing creep time under different working parameters. The effect of stress relaxation on globe-cone seal performance is analyzed in the paper, which would be practical in the engineering design, and also improve the theory system and method about globe-cone seal performance analysis in a certain extent.