基于湿热老化试验的航天器用丁腈橡胶贮存寿命预测

Prediction of storage life of nitrile butadiene rubber for spacecraft based on hygrothermal aging test

采用湿热加速老化试验的方法对航天器用丁腈橡胶材料的老化性能进行研究。以拉伸强度作为性能评价指标,结合Arrhenius模型与Eyring模型,建立航天器用丁腈橡胶材料的湿热老化寿命预测模型,并利用该模型预测丁腈橡胶材料的贮存寿命。结果表明,在湿热老化试验过程中,温度和湿度对丁腈橡胶材料的力学性能产生了较大影响;温度升高和湿度增加有利于丁腈橡胶材料老化反应速率的提高;以拉伸强度作为考察指标推算出丁腈橡胶材料在温度20℃、相对湿度60%的环境条件下贮存寿命为5.71年。

The aging properties of the nitrile butadiene rubber materials for spacecraft are studied by the hydrothermal accelerated aging test method.By combining the Arrhenius model and the Eyring model,the hydrothermal aging life prediction model of the nitrile butadiene rubber for spacecraft is established,and the storage life of the nitrile butadiene rubber is predicted by using this model.It is shown that the temperature and the humidity have a great influence on the mechanical properties of the nitrile butadiene rubber in the process of the hygrothermal aging test,where the higher temperature and humidity will lead to higher aging reaction rate of the nitrile butadiene rubber.With the tensile strength as the performance evaluation index,the storage life of the nitrile butadiene rubber under the environmental condition of 20℃and 60%RH is calculated to be 5.71 year.