Identification of failure modes of a PEEK-steel gear pair under lubrication

•An systematic experimental investigation is conducted to identify the failure modes of the lubricated PEEK gears under different loading conditions through the enclosed power flow test rig, supplemented with the measurements on wear, vibration and the surface micro-topography.•S evere thermal damag...

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Bibliographic Details
Published in:International journal of fatigue 2019-08, Vol.125, p.342-348
Main Authors: Lu, Zehua, Liu, Huaiju, Zhu, Caichao, Song, Hailan, Yu, Guoda
Format: Article
Language:English
Subjects:
Bend strength
Breakage
Durability test
Failure modes
Lubrication
Materials fatigue
PEEK gear
Pitting
Power flow
Root breakage
Topography
Wear
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Summary:•An systematic experimental investigation is conducted to identify the failure modes of the lubricated PEEK gears under different loading conditions through the enclosed power flow test rig, supplemented with the measurements on wear, vibration and the surface micro-topography.•S evere thermal damage occurs on the tooth surface of the PEEK gear under dry contact operation, while the no thermal damages are observed under the lubrication condition due to the fact that the heat accumulation on the tooth surface is dissipated effectively.•Experimental results reveal that the pitting-induced tooth breakage occurs under light and moderate loading conditions, while the tooth root breakage dominates under the heavy duty loading conditions. An experimental investigation is conducted to identify the failure modes of the lubricated PEEK gears under different loading conditions through the enclosed power flow test rig, supplemented with the measurements on wear, vibration and the surface micro-topography. The FZG C type gear pair is selected while the mating driving gear is chosen with the material of C45. Experimental results reveal that the pitting-induced tooth breakage occurs under light and moderate loading conditions, while the tooth root breakage dominates under heavy duty loading conditions. The measurement of the wear and the tooth surface micro-topography help to identify that the micro-pits near the pitch line lead to the final tooth breakage under moderate loading conditions. Meanwhile, the insufficiency of the bending strength under heavy loading conditions is the cause of the tooth root fracture.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2019.04.004