Liao Baopeng, Sun Bo, Yan Meichen, Ren Yi, Zhang Weifang, Zhou Kun
School of Reliability and Systems Engineering, Beihang University, Beijing 100191, China.
Southwest Technology and Engineering Research Institute, Chongqing 400039, China.
Materials (Basel). 2017 Oct 20;10(10):1211. doi: 10.3390/ma10101211.
Due to the increase in working hours, the reliability of rubber O-ring seals used in hydraulic systems of transfer machines will change. While traditional methods can only analyze one of the material properties or seal properties, the failure of the O-ring is caused by these two factors together. In this paper, two factors are mainly analyzed: the degradation of material properties and load randomization by processing technology. Firstly, the two factors are defined in terms of material failure and seal failure, before the experimental methods of rubber materials are studied. Following this, the time-variant material properties through experiments and load distribution by monitoring the processing can be obtained. Thirdly, compressive stress and contact stress have been calculated, which was combined with the reliability model to acquire the time-variant reliability for the O-ring. Finally, the life prediction and effect of oil pressure were discussed, then compared with the actual situation. The results show a lifetime of 12 months for the O-ring calculated in this paper, and compared with the replacement records from the maintenance workshop, the result is credible.
由于工作时间的增加，传输机液压系统中使用的橡胶O形环密封件的可靠性会发生变化。传统方法只能分析材料性能或密封性能中的一个，而O形环的失效是由这两个因素共同导致的。本文主要分析两个因素：材料性能的退化和加工工艺导致的载荷随机性。首先，在研究橡胶材料的实验方法之前，从材料失效和密封失效的角度对这两个因素进行定义。在此之后，通过实验可以获得随时间变化的材料性能，并通过监测加工过程得到载荷分布。第三，计算了压缩应力和接触应力，并将其与可靠性模型相结合，以获得O形环随时间变化的可靠性。最后，讨论了O形环的寿命预测和油压的影响，并与实际情况进行了比较。结果表明，本文计算出的O形环寿命为12个月，与维修车间的更换记录相比，结果是可信的。
