Finite element analysis of O-ring seal structure
-
摘要: 建立固体火箭发动机的橡胶O形圈的二维轴对称模型,采用非线性有限元方法计算了O形橡胶圈在库存和工作状态的变形及应力,分析了上下法兰张开间隙、初始压缩量、密封槽口及槽底倒角半径、密封槽宽、密封圈材料、O形圈截面尺寸及工作温度等典型参数对密封性能的影响:上下法兰张开间隙、密封圈的初始压缩率、密封圈材料等典型参数对最大接触压应力影响较大,而密封槽槽口和槽底处倒角对剪切应力影响明显.这些分析为密封结构的优化设计打下了基础;同时探讨O形圈应力分布规律,确定密封圈易受损和失效关键部位,初步确立了固体火箭发动机密封失效准则和失效模式.Abstract: Applying the theory of nonlinear finite element analysis, the stresses and strain of the elastomeric O-ring seals at storage and working process were analyzed. The factors influencing sealing performance were considered, such as gap between upper and nether flange, initial compressibility, groove width, sealing materials, O-ring section diameter and the work temperature. Results show that the gap breadth, initial compressibility and seals material do great contributions to the maximum contact normal stress, and the groove notch and bottom fillets act upon the maximum shear stress obviously. The analysis lays the foundation of the optimum design of sealing structure. Based on the stresses distribution and the brittle position, the failure mode & criteria were discussed and established.
-
Key words:
- stresses /
- strain /
- sealing /
- O-ring seals
-
[1] Metcalfe R, Baset S B, Lesco R,et al. Modeling of space shuttle solid rocket O-rings . 12th International Conference on Fluid Sealing . Brighton, UK, 1989.3~25 [2] 任全彬.橡胶O形圈的变形及应力分析[J].航空动力学报,1995,10(3):241~244 Ren Quanbin. Deformation and stress analysis of rubber O-ring[J].Journal of Aerospace Power,1995,10(3):241~244(in Chinese) [3] 左正兴,廖日东.12150柴油机橡胶密封圈的有限元分析[J].内燃机工程,1996,17(2):46~49 Zuo Zhengxing, Liao Ridong. Finite element analysis of rubber sealing ring for model 12150 diesel engine [J]. Neiranji Gongcheng, 1996, 17(2):46~49(in Chinese) [4] 陈汝训.固体发动机的密封问题[J].强度与环境,1995,4:1~5 Chen Ruxun.Sealing for solid rocket motor [J].Structure & Environment Engineering,1995,4:1~5(in Chinese) [5] George A F, Strozzi A, Rich J I. Stress fields in a compressed unstrained elastomeric O-ring seal and a compression of computer prediction with experimental results .11th International Conference on Fluid Sealing . Cannes, France,1987.117~137 [6] Green I, English C. Stresses and deformation of compressed elastomeric O-ring sealing . 14th International Conference on Fluid Sealing . Firenze, Italy, 1994. 83~95
点击查看大图
计量
- 文章访问数: 3451
- HTML全文浏览量: 348
- PDF下载量: 2264
- 被引次数: 0