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[1]姜薇,李晨,霍世慧,等.金属U-E密封结构重复使用性能数值分析[J].火箭推进,2024,50(01):105-112.[doi:10.3969/j.issn.1672-9374.2024.01.010]
　JIANG Wei,LI Chen,HUO Shihui,et al.Numerical analysis on reusable performance of metallic U-E rings[J].Journal of Rocket Propulsion,2024,50(01):105-112.[doi:10.3969/j.issn.1672-9374.2024.01.010]
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金属U-E密封结构重复使用性能数值分析

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V] 卷: 50 期数: 2024年01期 页码: 105-112 栏目: 目次 出版日期: 2024-02-28
Title:
Numerical analysis on reusable performance of metallic U-E rings
文章编号:
1672-9374(2024)01-0105-08
作者:
姜薇; 李晨; 霍世慧; 杨全洁; 周肖宇
航天液体动力全国重点实验室, 陕西 西安 710100
Author(s):
JIANG Wei;  LI Chen;  HUO Shihui;  YANG Quanjie;  ZHOU Xiaoyu
National Key Laboratory of Aerospace Liquid Propulsion, Xi'an 710100, China
关键词:
液体火箭发动机;  金属密封;  重复使用;  压缩回弹性能
Keywords:
liquid rocket engine;  metallic seal;  reusability;  compression springback property
分类号:
V261.34
DOI:
10.3969/j.issn.1672-9374.2024.01.010
文献标志码:
A
摘要:
液体火箭发动机金属密封结构工作在严苛的力热耦合环境中,其循环应力-应变行为和棘轮应变累积效应会显著影响密封环的回弹能力和疲劳寿命。基于统一黏塑性理论对其循环使用过程进行数值研究,采用Chaboche非线性随动硬化和饱和型各向同性硬化模型共同描述密封环基体材料的循环力学行为,分析了密封环经历8次循环使用过程中主副密封唇宏观接触合力的演化规律和局部塑性应变累积部位的损伤进程。结果表明:副密封经历循环力热载荷作用后,由于叠加了显著的棘轮应变,残余塑性应变和累积塑性应变远高于主密封,导致其回弹能力衰减快于主密封且疲劳寿命短于主密封,在重复使用过程中不能发挥冗余设计作用。此外,提高的介质压力和预紧力不足均会导致塑性应变的加速累积,进而影响密封环的循环压缩回弹性能和疲劳寿命,应在装配过程中注意控制预紧力。
Abstract:
The metallic seal structure of liquid rocket engine works in the harsh thermo-mechanical coupling environment, and the cyclic stress-strain behavior and ratcheting accumulation effect will significantly affect the rebound ability and fatigue life of the U-E rings. Based on the unified viscoplastic theory, the cyclic mechanical behavior of the sealing ring was numerical studied. The combined strain hardening 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 superimposed. 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 rebound performance and fatigue life of the seal ring.

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备注/Memo

收稿日期:2023- 11- 04 修回日期:2023- 12- 08
基金项目:中国航天科技集团有限公司自主研发项目; 国家重点实验室基金项目(HTKJ2021KL011003)
作者简介:姜薇(1987—),女,博士,研究领域为发动机结构强度及寿命。

更新日期/Last Update: 1900-01-01