针对Y形橡胶密封圈在海洋柔性管道接头中服役时的变温变压工况,基于热弹性力学以及热应力分析理论,利用大型有限元分析软件ABAQUS分析压力和温度同时变化时Y形密封圈变形与应力分布。结果表明：Y形橡胶密封圈截面最大Von Mises应力和接触压力均随着工作压力和温度的增大而增大,但工作压力的影响要大于工作温度。

Aimed at the rubber sealing Y-ring serving in the end fitting of flexible pipe in Marine at variable tempera-ture and pressure condition,the deformation and stress distribution of the rubber sealing Y-ring were analyzed in serving conditions of temperature and pressure changed synchronously,based on the thermoelasticity and theoretical analysis of thermal stress,by using finite element analysis software ABAQUS.The results show that the maximum Von Mises stress of the cross section of rubber sealing Y-ring and the contact pressure are increased along with increasing of the working pres-sure and temperature,but the effect of working pressure is greater than that of temperature.

研究制退机唇形橡胶圈在火炮高速发射时的动密封性能。分析唇形密封圈的工作原理,利用微观组织分析方法研究密封圈失效机制;通过橡胶力学性能试验和拟合寻优,确定橡胶超弹性本构模型,利用ABAQUS建立密封圈轴对称有限元模型;通过ADAMS仿真求解得到不同装药条件下制退机后坐速度、变化油压等参数,并综合考虑初始过盈量、摩擦因数、动密封速度等因素,分别对密封圈的安装、静密封和动密封等工况进行模拟;根据密封圈失效准则,研究变化油压冲击作用下的唇形橡胶圈动密封性能,对研究和掌握火炮发射状态下唇形密封圈的寿命规律具有一定参考价值。

The dynamic seal performance of lip seal of artillery recoil brake when artillery firing at high speed was studied. The work-ing principle of lip seal was analyzed,and the seal failure mechanism was studied by using the microstructure analysis method. Through the rubber mechanical properties testing and fitting optimization,the hyperelastic constitutive model of rubber was identified,and the sealing ring axisymmetric finite element model was established based on ABAQUS. The recoil brake parameters such as recoil displacement,recoil velocity and hydraulic pressure under the condition of different charge were solved by using the simulation software of ADAMS. The seal ring installation,static seal and dynamic seal condition were simulated by considering the effect of the initial amount of interference,the friction coefficient,the changing oil pressure and the relative velocity of dynamic seal. According to the seal failure criterion,the lip seal dynamic sealing performance was researched

传统自封型封隔器采用橡胶皮碗作为密封材料,耐高温性能差,使用寿命短。利用形状记忆合金的记忆性能,将形状记忆合金设计成封隔器中的密封部件——密封圈,封隔器在低温状态下到油井指定位置,当温度升高达到合金的Af点后,密封圈可自动恢复原来的形状和尺寸,其膨胀产生的应力使密封圈与油井井壁紧密接触,起到密封作用。利用形状记忆合金对温度变化的响应,可以简化产品结构,降低密封和解封的施工难度,满足高温生产环境的要求,提高产品的使用寿命。

In general, self-sealing packer using rubber as sealing material cannot work in high tem- perature, and its service life-span is short. To take advantage of the properties of shape memory alloy, it is possible to use shape memory alloy as sealing part（ sealing ring） of packer, and put packer into the predetermined site when the temperature is low. The sealing ring resumes automatically when the temperature rises to the point of Af, and the stress produced in expansion causes the sealing ring reach the wall of oil well, so that it can seal the oil well. Making use of the response of shape memory alloy when temperature changes, we can simplify the structure of products, reduce the difficulty of sealing or releasing, meet the need of high temperature, and raise the service life-span of products.

水下管道不停输封堵维抢修技术由于其特有优势,目前已广泛应用于解决海底管道日益加剧的安全问题。介绍了一种用于水下不停输封堵作业的新型水下机械式三通,该新型三通避免了传统焊接式三通安装时可能存在的安全问题,且操作简单,作业时间短。利用有限元模型对该三通的橡胶密封性能进行计算,结果显示其密封圈完全满足10MPa的密封要求;对橡胶的压缩角度进行优化,并选择10°压缩角作为最终设计。

Due to its unique advantages,underwater pipeline on-line repair technology has been widely used to solve the problem of subsea pipeline security problems.This paper introduces a new mechanical clamp for hot tapping which can avoid security issues occurred during the installa-tion of the traditional welded clamp,and operation for this new clamp is simple and quick.As rub-ber seal directly determines the mechanical clamp seal performance at work,this paper utilize the finite element method to calculate its performance which show the sealing ring can completely meet the sealing request under the pressure of 10 MPa.Finally,rubber compression Angle is opti-mized,and 10 degrees compression Angle is selected as the final design.

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。

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 p