密封圈热-结构耦合场参数化有限元分析

Parametric Finite Element Analysis of Thermal-Structure Couple on Seal Ring

应用超弹性理论和传热学原理,对带有挡圈的O形密封圈热-结构耦合场进行有限元分析,研究工作参数对密封圈性能的影响。结果表明:密封圈的根部以及与缸壁接触部位变形较大,最大Mises应力发生在根部;工作压力增大时,剪切应力和最大接触压应力明显增大。摩擦及机械滞后生热导致密封圈具有较高的温度场;流体压力、相对滑动速度增大以及流体温度升高时,密封圈温升均明显增大。为减少重复工作,提高分析效率,便于优化设计,开发了基于ANSYS/MATLAB的密封圈参数化自动分析系统,可以对不同类型、尺寸及工作条件下的密封圈进行分析。

The hyperelasticity theory and heat transfer principle were applied to the coupled field simulation of thermal and structure of O-ring with block ring by finite element analysis.The effect of working parameters on seal performance was studied.The results showed that the largest deformation appeared at bottom part and contact position with cylinder wall,the biggest Mises stress occurred at bottom part.The shear stress and maximum contact pressure increased significantly with the increase of medium pressure.The frictional and mechanical hysteresis led to high temperature field in seal ring.The temperature rise of seal ring evidently increased when medium pressure,relative slide speed and medium temperature increased.The parametric simulation system of seal ring was then developed based on ANSYS/MATLAB which was efficient and effective for the analysis of different type and dimension of O-ring seals under various working conditions.