潜水器大型舱段三角密封性能有限元分析

以某潜水器大型舱段连接处使用的三角密封结构为研究对象，建立O形圈与三角形沟槽接触的非线性有限元分析模型,仿真分析三角密封结构的橡胶材料硬度、O形圈内径、沟槽倒角尺寸、沟槽圆角尺寸对密封性能的影响规律。结果表明：橡胶材料硬度、沟槽倒角尺寸对密封性能影响较大，O形圈内径与沟槽圆角尺寸对密封性能影响较小；随着橡胶材料硬度的增加，O形圈密封能力增强，但在相同液体压力条件下，橡胶材料硬度越大O形圈应力越高，增大了O形圈被破坏的可能性，因此，在保证密封性能的前提下，要尽可能选取硬度小的O形圈；随着沟槽倒角尺寸的增加，O形圈的密封性能不断下降，同时应力水平也逐渐降低，因此，设计沟槽倒角尺寸时，在保证密封性能的前提下，要尽可能选取大的倒角尺寸。

Finite Element Analysis of Triangular Groove Sealing Performance for Large Cabin on Submersible

The triangular groove sealing structure for large cabin on a submersible was taken as the research object,the nonlinear finite element model of the contact between O-ring and triangular groove was established.The effects of rubber material hardness,O-ring inner diameter,chamfer and fillet of the groove of on the sealing performance of triangular groove sealing structure was simulated and analyzed.The results show that the rubber material hardness and the chamfer of groove have great influence on sealing performance,while the O-ring inner diameter and the fillet of groove have little effect on sealing performance.With the increase of rubber material hardness,the sealing performance is enhanced.However,under the same pressure,the greater of the rubber material hardness,the higher of the stress,which increases the possibility of damage of the O-ring.Therefore,under the premise of ensuring the sealing performance,the O-ring with lower hardness should be selected.With the increase of the chamfer size,the sealing performance and the stress of the O-ring decreases continuously.Therefore,under the premise of ensuring the sealing performance,it is necessary to select a larger chamfer size.