弹用O型硅橡胶密封圈失效机理及模型

目的利用日常收集到的使用数据来判断密封圈寿命,为预测弹药寿命提供依据。方法分析O型圈故障模式,引入了故障率经验公式。规范化O型密封圈的故障率公式,导出综合考虑了密封圈尺寸、接触应力与密封圈硬度、流体黏度、温度的密封圈故障率模型,并用算例验证这一模型的有效性。结果 O形硅胶密封圈的主要故障模式是泄漏,导出了综合考虑各因素后的密封圈故障率模型,并用该模型准确算出了某弹药的寿命。结论文中导出的故障率模型对于在弹药保障工作中评估某些种类弹药储存期限有借鉴意义。

Failure Mechanism and Model of O-type Silicon Rubber Sealing Ring for Ammunition

Objective To estimate the service life of O-ring with the daily operational data collected so as to provide a basis of the prediction for the service life of ammunition. Methods After analyzing the failure model of O-ring, the empirical equation of failure rate was introduced. Failure rate equation was normalized. At last, the failure rate model of sealing ring was educed by comprehensively considering sealing ring size, contact stress and hardness, fluid viscosity and temperature. Its validity was proven by examples. Results Leakage was the main failure mode of O-type silicone rubber sealing rings. The sealing ring failure rate model was educed after comprehensively considering all the possible factors and the service life of some ammunition was accurately calculated with such model. Conclusion This failure rate model can provide reference for the evaluation of the storage life of certain kinds of ammunition in the ammunition security work.