止脱弹簧的蠕变行为与贮存寿命预测

根据止脱弹簧的受力模式和失效机理，设计了止脱弹簧的蠕变老化试验装置，对止脱弹簧进行了蠕变加速老化试验，利用图像测量技术研究了载荷和温度对止脱弹簧自由端蠕变行为的影响规律。进一步，基于Arrhenius方程建立了止脱弹簧在力-热联合载荷下的蠕变动力学方程，预测了止脱弹簧的使用寿命。研究表明：止脱弹簧的蠕变位移是一个随时间变化的单调非减函数；环境温度和载荷水平的提高都会加速止脱弹簧的蠕变。所提方法和相关结论可为蠕变型止脱弹簧的设计和寿命预测提供参考。
According to the loading mode and failure mechanism of a certain anti-detaching spring, a testing device for creep of anti-detaching spring was designed and manufactured. The creep accelerated aging test was done, and the effect of the temperature and loading on the creep behavior of anti detaching spring was investigated with image measuring technology. Furthermore, the creep kinetic equation of anti-detaching spring subjected to loading and temperature based on Arrhenius equation was derived to predict the service life of the anti-detaching spring. The results show that the displacement of the spring due to creep is a monotonic non-decreasing function of time. Increasing the temperature or initial preload will result in accelerating its creep displacement. The method and conclusion may be helpful in creep anti-detaching spring design and life prediction.