20CrNiMo钢渗碳齿轮不同应力比下弯曲疲劳性能研究OA

To investigate the fatigue performance of 20CrNiMo steel carburized gears under different stress ratios,this experiment employed a fatigue testing machine to conduct bending fatigue tests on carburized gears at stress ratios of 0.50,0.33,and 0.25,respectively.The study indicates that fractures in 20CrNiMo steel carburized gears primarily occur at the tooth root region,with intergranular fracture being the dominant failure mode.Crack propagation rate increases as the stress ratio decreases.Gear fatigue life diminishes with decreasing stress ratio,reaching its maximum at a stress ratio of 0.50.