O形三元乙丙橡胶密封圈的使用寿命预测

根据包装箱结构设计典型密封结构，在模拟使用状态下对O形三元乙丙橡胶（EPDM）密封圈进行加速老化试验研究，获得在65，85和105 ℃下不同老化时间（5，10，15，20，25和30 d）的压缩永久变形变化规律，在此基础上，推导O形EPDM密封圈的失效时间与使用温度的数学关系式，预测出O形EPDM密封圈在25 ℃下的使用寿命为17.8 a。同时，将预测曲线与实测曲线进行对比分析得出预测曲线与实测曲线吻合良好，相关性参数R＞0.95。;In this study,the accelerated ageing test of EPDM O-ring was carried out using typical sealing fixture based on actual packaging structure.The change trends of compression set of O-ring at different ageing temperature (65,85 and 105 ℃) and different ageing time (5,10,15,20,25 and 30 d) were investigated.Through mathematical regression,the relationship between the time to failure and application temperature were obtained,and the predicated lifetime of EPDM O-ring was 17.8 years.Moreover,the predicted curve was in good accordance with the experimental curve and the correlation coefficient was greater than 0.95