6BT高强度球铁曲轴试验与计算研究

将试验和有限元计算相结合，分析比较了东风康明斯6BT发动机由三种不同球铁型号材质所加工出的6BT曲轴的疲劳强度及安全系数，探讨不同的材质、不同的加工方法及强化工艺对6BT球铁曲轴性能的影响，为选择合适的球铁材料及提高6BT球铁曲轴的机械性能提供了依据。

Study on fatigue strength of nodular cast iron crankshaft of model 6BT diesel engine

The fatigue strength and safety factor of crankshaft made of nodular cast iron with high intensity in 6BT type diesel engine were investigated by experimental and numerical methods. The effects of different composition design of nodular cast iron and different manufacture technology, especially crankshaft chamfer rolling machining were clarified on the performance of the crankshaft through the evaluation of the crankshaft bending fatigue strength tests. The fatigue safety factors were also calculated based on the numerical solution of three dimensional finite element analysis. The results were compared with the experimental data. The comparison proved that two results were in good agreement. The work of this paper can be consulted in the structural design, material selection and mechanical performance optimization of the crankshafts of diesel engines.