Tooth surface roughness and lubrication status have significant influence on the contact performance and fatigue life of helical gear pair. Yet, despite the development in elastohydrodynamic lubrication-based contact analysis and solution of subsurface stress field, researches in subsurface stress field of helical gears considering both lubrication and surface roughness are not quite comprehensive. In this study, three-dimensional surface roughness of generating ground gear is measured, a finite line-contact mixed elastohydrodynamic lubrication model is established to perform the contact analysis, and, on this basis, the influence of tooth surface roughness on the subsurface stress field is studied. Results show that compared with the smooth surface, the overall level of subsurface stress is raised; maximum stress values and plastic zones occur in the close vicinity of tooth surface, which adds to the risk of surface failure; within sections in the valley regions of roughness, locations of maximum stresses are generally similar to the smooth surface situation, i.e. in relatively deep zones, while within sections in the peak regions, the majority of locations with maximum stresses shift much closer to the surface; contact pressure and stress status see only mild undulation between different sections distributed along the contact line, but intense changes between sections distributed along the entraining direction.

中文翻译：

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基于有限线接触混合弹流润滑的磨削斜齿轮次表面应力场分析

齿面粗糙度和润滑状态对斜齿轮副的接触性能和疲劳寿命有显着影响。然而，尽管在基于弹性流体动力润滑的接触分析和次表面应力场求解方面取得了进展，但考虑润滑和表面粗糙度的斜齿轮次表面应力场的研究还不够全面。本研究测量了生成地齿轮的三维表面粗糙度，建立了有限线接触混合弹流润滑模型进行接触分析，并在此基础上研究了齿面粗糙度对次表面应力场的影响被研究。结果表明，与光滑表面相比，表面下应力整体水平有所提高；最大应力值和塑性区出现在齿面附近，这增加了表面失效的风险；在粗糙谷区的截面内，最大应力的位置通常类似于光滑表面的情况，即在相对较深的区域，而在峰区的截面内，大多数应力最大的位置更靠近表面；接触压力和应力状态仅见沿接触线分布的不同截面之间有轻微波动，但沿夹带方向分布的截面之间变化剧烈。在相对较深的区域，而在峰值区域的部分内，大多数应力最大的位置更靠近地表；接触压力和应力状态仅见沿接触线分布的不同截面之间有轻微波动，但沿夹带方向分布的截面之间变化剧烈。在相对较深的区域，而在峰值区域的部分内，大多数应力最大的位置更靠近地表；接触压力和应力状态仅见沿接触线分布的不同截面之间有轻微波动，但沿夹带方向分布的截面之间变化剧烈。