铝合金气缸盖低周疲劳蠕变耦合寿命预测的仿真与试验研究

Theexperimental and simulation studies aimed at the increasingly severe low cycle fatiguecreep problem of aluminum alloy cylinder heads in diesel engines were carried out. A whole-engine experiment was performed to determine the temperature field of the aluminum alloy cylinder head under various working conditions. Additionally, an electromagnetic induction heating equipment was employed to perform an accelerated thermal fatigue test on the aluminum alloy cylinder head. Furthermore, a part-level life model for fatigue-creep was developed using an energy-based approach. The model's validity was verified by finite element simulation, which identified the failure location and number of failure cycles. These results provide an effective method for investigating the low-cycle fatigue-creep reliability of aluminum cylinder heads and can aid in reducing failure rates in diesel engines.