鼓式制动器是重型商用车的关键安全部件，研究其疲劳寿命预测方法具有重要的工程意义。制动鼓的开裂是鼓式制动器失效的主要形式。该文首先建立并验证了鼓式制动器温度-应力顺序耦合的有限元模型，并获取了加速疲劳工况下制动鼓的动态应力曲线；然后拟合了高温状态下内表面材料的应力应变关系，代入动应力曲线作为疲劳载荷，使用Manson-Coffin-Basquin模型计算得到内表面各点的失效寿命；最后借助加速疲劳试验结果验证了鼓式制动器的疲劳寿命预测方法。该方法分析了制动器在实际工作过程中的热机载荷波动，考虑了制动鼓材料高温状态性能下降的影响，能够满足工程中制动器失效行为预测的使用需要，可为后续的优化设计奠定基础。

Drum brakes are a key safety component in heavy commercial vehicles, so they need accurate failure characteristic models. Drum cracking is the most common failure mechanism for drum brakes. This paper presents a coupled temperature-stress model for drum brakes that can obtain the dynamic stress curves for accelerated fatigue working conditions. Then, this paper fitted the relationship between the stress and strain of the material on the inner drum surface at high temperatures and used the former dynamic stress curves as the fatigue load. The Manson-Coffin-Basquin model was then used to predict the failure life of each point on the inner surface. This drum brake lifetime prediction method was then verified against accelerated fatigue test results. This model can include the effects of the load fluctuations on the drum during use, as well as the effect of the material performance degradation at high temperatures. This model is useful for optimizing engineering designs of drum brakes.