目的：研究某弹用O型橡胶密封圈的性能参数退化规律，并准确预测其贮存寿命。方法设计4个不同温度下的恒定应力加速退化试验，记录每个温度下不同时间点的性能退化数据，根据退化参数利用高分子材料性能变化与退化时间关系式及阿伦尼乌斯（Arrhenius)方程，建立O型橡胶密封圈压缩永久变形率与贮存时间的老化动力学方程。结果对照当地各个季节的平均温度值，建立了寿命评估模型，并由此预测了该型密封圈在自然环境贮存条件下的失效寿命在8年左右。结论该寿命评估值比较接近实际测量值，精度良好，可为O型橡胶密封圈在自然贮存条件下的寿命评估提供有价值的参考依据。%Objective To study the degradation law of performance parameters of an O-rubber sealing ring for missle and accurately predict its storage life. Methods This paper designed constant stress accelerated degradation tests at four different temperatures, recorded the performance degradation data at different time points at each temperature, and established the aging dynamics equation for the compression permanent deformation rate and storage time of O-rubber sealing ring based on degradation parameters and using the relationship between performance change of polymer materials and performance degradation time and Arrhenius equation. Results Using the local average temperature of each season as control, life assessment model was established, and it was predicted that the failure life of this type of sealing ring in the natural storage environment was about 8 years. Conclusion The life evaluation value was close to the actual measured value, with good precision, and can provide valuable reference for life assessment of the O-rubber sealing ring under the condition of natural storage.
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