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research-article

Effects of Texture Orientation on the Mixed Thermal Elastohydrodynamic Lubrication and Fatigue Life in Point Contacts

[+] Author and Article Information
Xiaoliang Yan

AVIC Qing'an Group Co., Ltd., Xi'an, 710077, China
yanxiaoliang111@126.com

Yuyan Zhang

College of Mechanical and Electronical Engineering, Nanjing Forestry University, Nanjing, 210037, China
zyy1988111@163.com

Guoxin Xie

State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China
xgx2014@tsinghua.edu.cn

Xiaoqiong Du

AVIC Qing'an Group Co., Ltd., Xi'an, 710077, China
xqdu0101@163.com

Fen Qin

AVIC Qing'an Group Co., Ltd., Xi'an, 710077, China
qinfei527@163.com

1Corresponding author.

ASME doi:10.1115/1.4040474 History: Received February 11, 2018; Revised May 27, 2018

Abstract

Predicting the mixed thermal lubrication performance and fatigue life of point contact components becomes more and more important with the increasing demand for the load capacity of machinery. To achieve this, a deterministic mixed thermal elastohydrodynamic lubrication (TEHL) model in point contacts considering surface roughness is developed in this study. This model is capable of determining the pressure and temperature under different lubrication regimes from mixed to full-film lubrication. Then, the established model is extended to the subsurface stress and fatigue life predictions. Numerical simulations are conducted to analyze the lubrication characteristics and fatigue life for the three-dimensional sinusoidal surfaces with variable directions. Results show that increasing entraining velocity contributes to the reduction of pressure fluctuation and prolongation of fatigue life. However, the resulting temperature increases with the entraining velocity. As for the influence of lubricant viscosity, increasing it prolongs the fatigue life, especially under mixed TEHL conditions. What's more, the effect of rough surface texture feature on fatigue life has a close relationship with the lubrication regime.

Copyright (c) 2018 by ASME
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