TH132.417
国家自然科学基金项目（面上项目，重点项目，重大项目）
The National Key Technologies R&D Program of China
聚醚醚酮（PEEK）齿轮是高性能聚合物齿轮，广泛应用于汽车、无人机、机器人等领域。然而PEEK齿轮失效机理复杂、失效形式随载荷变化，导致其在动力传动场合应用时缺乏合理的设计依据。针对PEEK齿轮失效机理不明和失效形式转变的问题，开展了喷油润滑下PEEK齿轮副疲劳性能试验，计算了PEEK齿轮接触应力和弯曲应力，并通过扫描电镜等设备进行了失效表征。试验发现，喷油润滑下PEEK齿轮失效形式主要为齿面点蚀和齿根疲劳断裂，讨论了喷油润滑下PEEK齿轮齿面点蚀与齿根疲劳断裂的失效机理，发现了PEEK齿轮接触疲劳失效与弯曲疲劳失效之间的临界转变关系，并提出了PEEK齿轮失效形式的评估方法。当PEEK齿轮接触应力与弯曲应力之比低于1.02时，PEEK齿轮主要发生齿根疲劳断裂；接触应力与弯曲应力之比高于1.1时，PEEK齿轮主要发生齿面点蚀破坏；而PEEK齿轮接触应力与弯曲应力之比在1.02-1.1之间时，存在齿面接触疲劳与齿根弯曲疲劳的临界失效转变点。
Polyetheretherketone (PEEK) gears are high-performance polymer gears that are widely used in automobiles, drones, robots, and other fields. However, the complex failure mechanism of PEEK gear and the failure forms change with load lead to a shortage of a reasonable design basis in power transmission applications. Aiming at the unclear failure mechanism and transition of failure forms of PEEK gear, carried out the fatigue performance test of PEEK helical gear pair under oil injection lubrication, and calculated the contact stress and bending stress of PEEK gear, together with analyzing the failure by scanning electron microscopy and other equipment. Experimental results that the failure forms of PEEK gear under oil injection lubrication are mainly tooth surface pitting failure and tooth root fatigue fracture, discussing the failure mechanism of PEEK gear tooth surface pitting and tooth root fatigue fracture under oil injection lubrication. Simultaneously, discovering the critical transition relationship between PEEK gear contact fatigue failure and bending fatigue failure, and proposed an evaluation method for the failure form of PEEK gear. When the ratio of contact stress to bending stress of PEEK gear is lower than 1.02, PEEK gear mainly suffers from root fatigue fracture; when the ratio of contact stress to bending stress is higher than 1.1, PEEK gear mainly suffers tooth surface pitting failure; and when the ratio of PEEK gear contact stress to bending stress is between 1.02-1.1, there is a critical failure transition point between tooth surface contact fatigue and root bending fatigue.
