针对产品可靠性评估中忽视使用应力变化的问题,基于加速寿命试验的思想,利用加速系数,在已知加速模型的基础上建立了处理变化使用应力的时间折合模型及变化的使用应力在某个时间段内的等效应力模型。最后将上述模型应用到了某型舰船电缆绝缘材料的等效使用环境温度计算中。通过与原方法对比,验证了文中方法的正确性及有效性。该方法对产品其他情况下变应力的处理有借鉴作用。 Aiming at the problem of neglecting the use of stress changes in product reliability assessment, based on the idea of ​​accelerated life test, based on the known acceleration model, the time-based model of changing stress is established based on the acceleration coefficient. Equivalent stress model over time. Finally, the above model is applied to the calculation of the equivalent ambient temperature of a certain ship cable insulation material. By comparing with the original method, the correctness and validity of the method in the text are verified. This method can be used as a reference for the treatment of stress in other cases.