斜齿轮疲劳裂纹萌生及扩展过程全寿命研究
发布时间：2018-10-21 16:37
【摘要】：文章以斜齿轮为研究对象,综合考虑混合润滑状态下摩擦动力学特性对齿面应力分布的影响以及渗碳表层硬度梯度和残余应力的非均匀分布特征,以风险疲劳累积理论为基础建立了疲劳裂纹萌生寿命预估模型;考虑裂纹在晶粒内部的非线性扩展规律以及晶界处的非连续扩展特征,建立了短裂纹扩展模型;针对长裂纹扩展过程中不同阶段扩展速率的差异,建立了长裂纹扩展速率统一方程,从而完成了对齿轮接触区疲劳裂纹萌生及扩展过程全寿命的预估.计算结果表明:齿面应力分布受动载荷和润滑状态的影响显著;在残余应力作用下,有效剪切应力在渗碳表层出现多个波峰,疲劳裂纹萌生位置多点化,导致裂纹尺度有所不同,疲劳寿命存在差异,失效形式多样化.
[Abstract]:In this paper, helical gear is taken as the research object. The influence of friction dynamics on the stress distribution of tooth surface under mixed lubrication and the non-uniform distribution of hardness gradient and residual stress in Carburized surface are considered synthetically. Based on the theory of risk fatigue accumulation, the prediction model of fatigue crack initiation life is established, and the short crack propagation model is established considering the nonlinear propagation law of crack inside grain and the discontinuous propagation characteristics at grain boundary. According to the difference of growth rate in different stages of long crack propagation, the uniform equation of long crack growth rate is established, and the prediction of fatigue crack initiation and whole life of gear contact zone is completed. The calculated results show that the stress distribution on the tooth surface is significantly affected by the dynamic load and the lubrication state, and the effective shear stress appears several wave peaks in the surface layer of Carburizing under the action of residual stress, and the fatigue crack initiation position is multiple points. As a result, the crack size is different, the fatigue life is different, and the failure forms are diversified.
【作者单位】： 哈尔滨工业大学电气工程及自动化学院;北京精密机电控制设备研究所;
【分类号】：TH132.41
本文编号：2285711
[Abstract]:In this paper, helical gear is taken as the research object. The influence of friction dynamics on the stress distribution of tooth surface under mixed lubrication and the non-uniform distribution of hardness gradient and residual stress in Carburized surface are considered synthetically. Based on the theory of risk fatigue accumulation, the prediction model of fatigue crack initiation life is established, and the short crack propagation model is established considering the nonlinear propagation law of crack inside grain and the discontinuous propagation characteristics at grain boundary. According to the difference of growth rate in different stages of long crack propagation, the uniform equation of long crack growth rate is established, and the prediction of fatigue crack initiation and whole life of gear contact zone is completed. The calculated results show that the stress distribution on the tooth surface is significantly affected by the dynamic load and the lubrication state, and the effective shear stress appears several wave peaks in the surface layer of Carburizing under the action of residual stress, and the fatigue crack initiation position is multiple points. As a result, the crack size is different, the fatigue life is different, and the failure forms are diversified.
【作者单位】： 哈尔滨工业大学电气工程及自动化学院;北京精密机电控制设备研究所;
【分类号】：TH132.41
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