基于Odgen模型O型橡胶密封圈的大变形接触分析

摘要

By utilizing nonlinear finite element analysis software MSC.Marc,the material parameters of Odgen model were determined through curve fitting by using the experimental data of uniaxial tensile experiments of rubber-like materi-als.The nonlinear finite element model of rubber O-ring seals was set up and the influence of different medium pressure on the mechanical properties of rubber O-ring seals was analyzed.The distribution of Von-mises stress and contact stress on primary contact surface and side contact surface was achieved.The results show that with the increase of medium pressure, the Von-mises stress is increased and transfered to the contact zone between rubber seal and groove,and its distribution on primary contact surface and side contact surface is approximate quadratic parabola.The maximum contact stress appears on the middle contact zone,and it is increased obviously with the increases of medium pressure.The maximum contact stress is greater than medium pressure,which can prevent the leakage of medium.%利用大型非线性有限元软件MSC.Marc，基于橡胶类材料单轴拉伸所得到的应力应变曲线，通过数据拟合确定Odgen模型的材料参数。建立O型橡胶密封圈非线性有限元计算模型，分析不同的介质压力对橡胶密封圈力学性能的影响，得到橡胶密封圈的Von-mises应力的分布规律、主接触面以及侧接触面接触应力的分布曲线。研究结果表明：随着介质压力的增加，Von-mises应力随之增加，并向密封圈与沟槽的接触区域转移。在主接触面和侧接触面接触应力的分布近似为二次抛物线，接触应力的最大值出现在接触区的中点，随着介质压力的增加，接触应力的峰值和接触宽度明显增加，且应力峰值均大于介质压力，能够较好地防止介质的泄漏。