摘要
利用ANSYS建立FESCO气缸O型密封圈二维轴对称模型,对不同结构参数对密封圈的静态和动态密封特性进行研究,在结构分析的基础上,利用黏弹性力学和摩擦热分析机理,将热源归结为摩擦生热和机械滞后生热,进行了温度场分析。仿真结果表明:随着气体压力和预压缩率增加,接触应力和Von Mises应力增加。当施加往复运动载荷时,由于橡胶非线性将产生最大接触应力的波动,且外行程密封优于内行程。摩擦生热产生在缸筒和O型密封圈滑动区域,机械滞后导致O型圈中心区域节点温度最高。两者共同作用会产生很高的温度场,因此应该限制压缩率和相对滑动速度。
Thetwo-dimensional axisymmetric finite element model of the rubber O-ring was established with the help of software ANSYS. The effect of different structure parameters on the static and dynamic sealing characteristics of O-ring was discussed. Moreover,the heat generation mechanisms by friction and mechanical hysteresis of rubber seal ring were analyzed based on hyperelasticity theory and heat transfer principle and the temperature distribution was obtained. The results show that O-ringsthe contact stress and Von Mises stressbecame larger as the compression ratio and the medium pressure increased.Because of the rubber nonlinear characteristics,the contact stress of O-seal ring fluctuated over time,and the contact stress of stroke was greater than the external trip.Frictional heat mainly led to temperature raise on the area where the sealring and the cylinder contact,and mechanical hysteresis led to high temperature filed in the central part of seal ring. Seal ring had high temperature field under two kinds of heat source. So it was important to reduce the relative sliding velocity and the work pressure.
出处
《机械设计与制造》
北大核心
2016年第2期8-11,共4页
Machinery Design & Manufacture
基金
机器人技术与系统国家重点实验室开放基金资助(SKRLS-2011-MS-02)
关键词
O型密封圈
有限元
温度场
接触应力
O-Ring
Finite Element
Temperature Field
Contact Stress
