拉伸载荷下管路连接副的密封性分析

研究了航空发动机钛合金管路连接副在拉伸载荷下的密封性能．首先，建立了连接副的等效刚性模型，分析其在拉伸载荷下的受力，研究了密封面的接触力随拉伸载荷的变化规律，从机理上分析了拉伸载荷下管路连接副的密封性．第二，建立了管路连接副在拉伸载荷下的多体弹性接触模型，并对其进行有限元分析．采用初始渗透接触法，实现连接副的预紧状态，在此基础上施加拉伸载荷，然后再进行有限元求解．同时，研究了连接副密封面的接触力、接触面积和接触应力随拉力的变化规律，从而定量地分析连接副的密封性．

Sealing performance of pipeline connection under the tensile load

The sealing performance of aircraft engine pipeline connection was investigated under the tensile load in two aspects. Firstly, the contact force change of the pipeline connection sealing surface was studied to make a mechanical analysis of the sealing performance, by establishing the equivalent rigid model and the force balance equations of the pipeline connection under tensile load. Secondly, the multi-body contact elastic model of pipeline connection was established and the numerical simulation was made by finite element method(FEM) under the pre-tightening force and tensile load, whilst the contacts with initial penetration were established to realize the implementation of preload. On the basis of the simulation results, this paper made a detailed quantitative analysis of pipeline connection's sealing performance, through investigation of contact forces, contact area and contact stress on the sealing surface.