O-Ring Static Sealing Reliability Model and Influence Factors Analysis

Abstract

Sealing reliability plays a very important role in the aviation field. This paper put forward a new sealing reliability analysis method which can be applicable to most of the static seals. For the long-term using rubber seals, it will emerge stress relaxation which may lead to sealing failure. So, it needs to define a stress relaxation factor, which will analyze the sealing reliability taking the stress relaxation into account. Then, set the O-ring as a case, it calculated the static sealing reliability of the O-ring in operating conditions. And it also analyzed the influence of design parameters on the sealing reliability. Finally we found: (1) When the design parameters is certain, the stress relaxation factor, variance and correlation coefficient of the random variables will make a big influence on the sealing reliability; (2) When the design parameters is not certain, the compression ratio and media pressure also have a big influence on the sealing reliability.