Numerical analysis on reusable performance of metallic U-E rings
The metallic seal structure of liquid rocket engine works in the harsh thermo-mechanical cou-pling environment,and the cyclic stress-strain behavior and ratcheting accumulation effect will signifi-cantly affect the rebound ability and fatigue life of the U-E rings.Based on the unified viscoplastic theo-ry,the cyclic mechanical behavior of the sealing ring was numerical studied.The combined strain hard-ening model was used to describe the cyclic mechanical behaviors of the seal.The total contact force and damage evolution process of the seal during the 8 using cycles were analyzed.The results show that after the secondary seal was subjected to cyclic thermo-mechanical load,significant ratcheting strain was su-perimposed.The residual plastic strain and cumulative plastic strain are much higher than that of the main seal,which leads to its rebound ability decay faster than that of the main seal and its fatigue life is shorter than that of the main seal.In addition,the increased medium pressure and insufficient preload will lead to the accelerated accumulation of plastic strain,which will affect the cyclic compression re-bound performance and fatigue life of the seal ring.
万方数据
维普
