考虑贮存剖面的固体火箭发动机橡胶密封圈贮存寿命研究

Storage Life of Silicone-rubber Sealing Ring for Solid Rocket Motor Based on Storage Condition

目的对贮存周期内包含多个温度环境剖面的固体火箭发动机橡胶密封圈贮存寿命进行评估。方法通过开展硅橡胶材料加速老化试验,结合Arrhenius老化规律,建立硅橡胶老化模型,获得硅橡胶加速老化等当规律,并根据等当关系开展模拟密封装置加速老化试验,考核老化后硅橡胶密封性。最后通过对固体火箭发动机贮存环境剖面进行梳理,计算出贮存周期下的等效温度,并结合试验获得的硅橡胶密封圈老化性能,直接对该贮存周期下密封圈老化寿命进行评估。结果通过硅橡胶材料老化试验及模拟密封装置老化试验,得到了25℃下硅橡胶能够满足20 a的使用寿命。随后通过梳理并计算得出固体火箭发动机贮存周期下的等效温度为22.78℃,可以直接获得该发动机使用的硅橡胶密封圈寿命在该贮存环境下能够满足20 a使用寿命。结论通过计算贮存周期下多个温度环境剖面的等效温度,并结合加速老化试验结论,可快速获得橡胶密封圈老化寿命。

The work aims to evaluate the storage life of silicone-rubber sealing ring for solid rocket motor under multiple temperature conditions during the storage cycle.A series of accelerated aging tests were carried out to the silicone-rubber mate-rial.Combined with the test results and Arrhenius formula,the aging model for silicone-rubber material was established.Then,the equivalent law of accelerated aging of silicone-rubber material was obtained,and the accelerated aging test was carried out to the simulated sealing device according to the equivalent relationship to verify the sealing performance of aged silicone-rubber material.Finally,the equivalent temperature was calculated by sorting out the storage environment data of a solid rocket motor and the aging performance of silicone-rubber sealing ring was obtained combined with the test results.Thus,the aging life of sealing ring under this storage cycle was directly evaluated.Ultimately,it was concluded that the service life of silicone-rubber sealing ring could reach 20 years at 25℃after the aging tests of silicone-rubber material and simulated sealing device.The equivalent temperature of the silicone-rubber sealing ring used for solid rocket motor during its storage cycle was 22.78℃,so it could directly come to a conclusion that the service life of silicone-rubber sealing ring used in this motor could meet the service life of 20 years in this storage environment.The aging life of rubber sealing ring can be obtained quickly by calculating the equivalent temperature under multiple temperature environment conditions during storage cycle and combining with the conclu-sion of accelerated aging test.