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Comparative Studies of Contact Strain between O-Ring and the Sealing Groove under Normal Condition and Failure Mode

The condition monitoring of seals is very important in the working process of the hydraulic system. However, it is often difficult because of the limitation of the structure. The purpose of this study is to find an effective way to solve it. With finite element analysis (FEA) software Ansys Workbench, and the O-ring is taken as the example for the comparative study of the contact strain between the O-ring and the sealing groove under normal condition and failure mode respectively. The results show that the contact strain on the sealing groove under normal condition and failure mode are different. A certain rule is presented as the working medium pressure, pre squeeze rate, sealing groove notch radius and temperature changes. It provide an important basis for further monitoring of O-ring failure through contact strain changes in sealing groove.