Weibull-distribution-based method for predicting reliable service life of rubber ring

Abstract

The invention discloses a Weibull-distribution-based method for predicting the reliable service life of a rubber ring. The method includes the following steps: S1, determining an average growth rate lambda i of a permanent compression deformation rate epsilon iK of a rubber ring sample through a diagnostic test and then determining test time t of a rubber ring sample degradation test plan; S2, according to the rubber ring sample degradation test, obtaining an initial axial thickness H0 of the rubber ring sample, an axial thickness HijK of the rubber ring sample at each detection time point, and a permanent compression deformation rate epsilon ijK during each test process; and S3, according to the permanent compression deformation rates epsilon ijK of all test processes, predicting a service life of the rubber ring according to a rubber degradation formula and an acceleration model based on the Weibull distribution and analyzing the reliability of the rubber ring. Compared with the traditional rubber service life prediction method capable of obtaining a single service life prediction value, the method has advantages: a reliable service life value is obtained by using a service lifedistribution function, so that the evaluation result has higher credibility.

Description

technical field [0001] The invention relates to the field of research on the reliability of rubber rings, in particular to a method for predicting the reliable life of rubber rings based on Weibull distribution. Background technique [0002] Rubber rings are widely used in the sealing industry due to their excellent sealing performance and low cost. But the rubber material is easy to age, which affects its sealing performance. The famous "Challenger" space shuttle explosion accident is caused by the failure of the O-ring. Therefore, the reliability evaluation and life prediction of rubber rings are of great significance to engineering applications. The traditional rubber ring life prediction method only averages the aging performance parameters of the samples measured at each temperature level, without considering the distribution characteristics of the product, resulting in low prediction accuracy. At the same time, because no statistical distribution is introduced, this ...

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Problems solved by technology

The traditional rubber ring life prediction method only averages the aging performance parameters of the samples measured at each temperature level, without considering the distribution characteristics of the product, resulting in low prediction accuracy. At the same time, because no statistical distribution is introduced, this method does not Combining the life and reliability of the rubber sealing ring, the predicted result is only a life value, which does not reflect the reliability characteristics of the product

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