直齿轮啮合疲劳强度的有限元仿真与失效分析

齿轮啮合疲劳强度的理论计算和虚拟仿真均与实际啮合情况存在偏差,两者的精度值得讨论.首先在UG环境下建立标准渐开线直齿轮模型,再运用UG有限元工具对轮齿进行了齿根弯曲疲劳强度与齿面接触疲劳强度的力学仿真,最后对虚拟仿真与理论算法的结果进行了比较分析.结果表明:齿根弯曲应力和齿面接触应力分布图符合理论推断,但理论计算忽略了轮齿受到的径向压应力,有限元仿真的边界载荷条件更为真实,但结果应当引入载荷因数K.本文在同一软件环境中实现了齿轮的CAD与CAE,为齿轮的建模、仿真提供了设计参考与误差分析的思路,有助于提高齿轮设计的效率和质量.

Simulation Study of Meshing Fatigue Strength of Involute Cylinder Gear

There are two methods to obtain the result of gear fatigue strength： theoretical calculation and CAE simulation. There will be some error between the result and the actuality. First, the normal involute cylinder gear model was built in the UG environment, the gear tooth contact fatigue and bending strength simulation was then implemented. At last the simulation result was compared with the theoretical calculation result. The comparison showed that： both theoretical calculation and structural analysis results was satisfied to the requirement of admissible stress. The radial compressive stress influence to the bending strength was not considered in the theoretical calculation and the load factor K should consider into the simulation result. The combination of CAD and CAE was achieved in one software background. This paper,which is a reference to the gear modeling and simulation as well as the error analysis, could make a useful effort to increase the efficiency and quality of product.