某型橡胶密封圈加速贮存试验设计与实践

目的针对某型橡胶密封圈开展加速贮存试验设计,并通过试验预测产品贮存寿命。方法通过分析橡胶密封圈在贮存使用环境下的失效机理,结合橡胶材料性能老化模型,在不改变失效机理、又不增加新的失效机理的前提下,以密封圈整件作为试验对象,用加大温度应力的试验方法加速产品失效过程,根据试验结果预计正常环境应力下的产品贮存寿命。结果采用温度应力作为加速贮存应力开展密封圈加速贮存试验方案设计和验证工作,评估得到其在贮存温度为20℃的环境中,贮存寿命可以达到16.97年,置信度大于0.95。结论以密封圈整件作为试验件,采用温度应力作为贮存敏感应力开展加速贮存试验,所评估得到的贮存寿命与产品已有的自然贮存寿命结果吻合得较好,试验状态更加真实,为橡胶密封圈更换周期提供参考依据,并为密封圈贮存寿命的定量评估提供了一种参考方法。

Storage Accelerated Test Design and Practice of a Type of Rubber Ring Seal

Objective The accelerated storage test was designed for a type of rubber ring seal and the life of storage was pre-dicted through the test.Methods Based on the failure mechanism of the rubber ring seal in storage environment, combined with the aging model of rubber material, on the premise of neither changing the failure mechanism nor adding new failure mechanism, the rubber ring seal was chosen as the test object, the test method of putting more stress to accelerate the process of product fail-ure was used, and the life of storage in the normal environment was predicted according to the test result.Results The design and validation of rubber ring seal storage accelerated test were carried out with the temperature stress as accelerated storage stress. When the storage temperature in the environment was 20℃, the life of storage could reach 16.97 years, and the confi-dence was greater than 0.95.Conclusion The storage accelerated test was conducted with the whole rubber ring seal as the test object and the temperature stress as the storage sensitive stress, the estimated storage life was in relatively good accordance with the natural storage life result of the product, and the test status was much more real. It provided the reference for the replacement period of rubber ring seal. Meanwhile, it provided a method for quantitative evaluation of the storage life of the rubber ring seal.