Abstract
Gear contact fatigue is one of the most significant limitations to improving the contact performance and reliability. Carburizing is extensively applied to enhance contact performance by forming a hard case and a tough core in gears. This procedure introduces initial residual stress and hardness gradient, which makes a significant challenge for contact analysis and fatigue life evaluation of carburized gear. In this paper, a plasto-elastohydrodynamic lubrication (PEHL) model considering surface roughness, hardness gradient and initial residual stress is developed to evaluate the contact performance of carburized gear. The effects of surface topography and gradients of mechanical properties on gear contact state are investigated. The elastohydrodynamic lubrication and the elastoplastic contact are coupled by the general film thickness equation. The variation of yield limit along the depth direction is represented by hardness gradient. The initial residual stress is superimposed on to the load induced elastoplastic stress field. The results show that the compressive residual stress causes a remarkable increase in contact performance. For high roughness, the influence of residual stress on contact performance is limited.
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Acknowledgements
This project is supported by the National Natural Science Foundation of China (Grant No. 52005057), and the China Postdoctoral Science Foundation (Grant No. 2021M690176), and the Natural Science Foundation of Chongqing, China (Grant No. cstc2020jcyj-msxmX0643), and the Fundamental Research Funds for the Central Universities (Grant No. 2020CDJQY-A069).
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Cheng, S., Zhou, Y., Bai, H. et al. The effect of surface integrity on contact performance of carburized gear. J Braz. Soc. Mech. Sci. Eng. 43, 480 (2021). https://doi.org/10.1007/s40430-021-03183-2
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DOI: https://doi.org/10.1007/s40430-021-03183-2