O形圈动密封特性的有限元分析

莫丽; 王军

doi:10.13433/j.cnki.1003-8728.2015.0313

O形圈动密封特性的有限元分析

doi: 10.13433/j.cnki.1003-8728.2015.0313

莫丽,
王军

1.
西南石油大学机电工程学院, 成都 610500

基金项目:

国家自然科学基金重点项目（51134004）资助

详细信息

作者简介:
莫丽（1968-），副教授，硕士生导师，研究方向为机械设计，moli3913@126.com

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- 被引次数: 0
出版历程
- 收稿日期: 2013-07-21
- 刊出日期: 2015-03-05

Finite Element Analysis of the Dynamic Sealing Characteristics for O-ring

Mo Li,
Wang Jun

1.
School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500

摘要

摘要: 利用软件ABAQUS建立了O形圈的轴对称有限元模型，分析了其在往复动密封中的密封性能，并对其不同工况下的力学性能进行了研究。结果表明：往复动密封中，O形圈主密封面最大接触应力与Von Mises应力的作用位置随运动方向的变化而改变，且大小随时间呈波动变化；速度小于0.25 m/s时，速度对摩擦力与剪切应力几乎无影响；随着摩擦系数、介质压力的增大，摩擦力与剪切应力对速度的敏感性变高；介质压力与摩擦系数对摩擦力与剪切应力影响较大，剪切应力与摩擦力呈同步变化；密封外行程Von Mises应力与剪切应力均大于内行程，更易引起疲劳与剪切破坏；预压缩率增加到一定值时，O形圈在动密封中所受的摩擦力急剧上升，动密封中预压缩率不宜过大。
- ABAQUS /
- O形圈 /
- 往复动密封 /
- 力学性能 /
- 压缩率
Abstract: An axisymmetric finite element model for O-ring was built based on the soft-ware Abaqus, and its seal performance in reciprocating dynamic seals and its mechanical properties under different conditions were analyzed. The results show that the biggest contact stress on the primary seal face and Von Mises stress's acting position change with the direction of movement and the size fluctuated over time. When reciprocating speed is less than 0.25 m/s, the friction force and shear stress are almost not affected by speed. With the friction coefficient and medium presure increased, friction force and shear stress become higher sensitive for speed. Medium presure and friction coefficient have a great impact on friction force and shear stress. Friction force and shear stress change simultaneously. The Von Mises stress and shear stress in outer journey are bigger than the inner journey, and outer journey is more likely to cause fatigue and shear failure. The friction force of O-ring in dynamic seal suffered a sharp rise when compression ratio get to a certain value, so too large compression ratio should not be adopted in dynamic seal.
- ABAQUS /
- compression ratio /
- constitutive models /
- fatigue of materials /
- finite element method

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参考文献(11)

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