Critical transition relations for fatigue failure of PEEK gear under oil-jet lubrication
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Abstract:
Polyetheretherketone (PEEK) gears are high-performance polymer gears widely used in automobiles, drones, robots, and other fields. However, the complex failure mechanism of PEEK gears and the lack of basic data on loading capacity lead to a shortage of a reasonable design basis in power transmission applications. To address the unclear failure mechanism and the lack of fundamental durability data of PEEK gears, fatigue performance tests of PEEK helical gear pairs under oil-jet lubrication were carried out, and the contact stress and bending stress were calculated. The failure mechanism were investigated by using scanning electron microscopy and other equipment. Experimental results show that the primary failure modes of PEEK gears under oil-jet lubrication were tooth surface pitting failure and tooth root fatigue fracture. The critical transition relationship between PEEK gear contact fatigue failure and bending fatigue failure was identified, and an evaluation method for the failure form of PEEK gears was proposed. When the ratio of contact stress to bending stress of the PEEK gear was smaller than 1.02, the PEEK gear mainly suffered from root fatigue fracture; when the ratio of contact stress to bending stress was larger than 1.10, the PEEK gear mainly suffered from tooth surface pitting failure. When the ratio was in the range from 1.02 to 1.10, there was a critical failure threshold between tooth surface contact fatigue and root bending fatigue.
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Supported by National Natural Science Foundation of China (52175041), and Chongqing Postgraduate Research and Innovation Project (CYB22008).
