Prediction of Contact and Lubrication Characteristics of Micro-textured Surface Under Thermal Line Contact EHL

Jiang Zhao,Hong Zhang,Rupeng Zhu,Zhengminqing Li

doi:10.3389/fmech.2021.672588

Jiang Zhao, Hong Zhang + Show 2 more

Open Access

https://doi.org/10.3389/fmech.2021.672588

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Abstract

In this study, a method combining numerical surface generation technology and three-dimensional hot-line contact EHL is employed to evaluate the contact characteristics of micro-textured surfaces under high-load line contact. Based on numerical simulation, the film thickness, film pressure, friction coefficient and surface flashing temperature of the virtual texture surface with different cross-sectional shapes and sizes are studied. On this basis, the subsurface stress at the contact point is calculated by the DC-FFT algorithm. The results show that, compared with a smooth surface, the micro-textures of different shapes all increase the average oil film thickness of the surface and reduce the friction coefficient, but at the same time lead to an increase in the contact stress of the surface. By changing the width and depth of the texture, the maximum film pressure has changed by 11.4 and 18.5%, respectively.

Highlights

It has been reported that micro-texture can improve surface properties by increasing and reducing friction (Yuan et al, 2011; Gachot et al, 2017; Codrignani et al, 2020), and has been successfully used in bearings, seals and other mechanical parts. (Wang, 2014; Gropper et al, 2016)
The coefficient of friction of the micro-textured surface obtained from the three-dimensional EHL model at different velocities is compared with the friction coefficient obtained in the experiment, and a more accurate model is obtained through continuous iteration
The applied load per unit length is 325.1654 N/mm and the Hertz contact stress is fixed at pH 728 MPa, and the velocities is 0.01 m/s, 0.1 m/s, 1 m/s, 1.5 m/s, 2 m/s, 2.5 m/s, and 3 m/s, respectively

Summary

Introduction

It has been reported that micro-texture can improve surface properties by increasing and reducing friction (Yuan et al, 2011; Gachot et al, 2017; Codrignani et al, 2020), and has been successfully used in bearings, seals and other mechanical parts. (Wang, 2014; Gropper et al, 2016). Due to the diversity of the shape and arrangement of the micro-textures and the micro-textures exhibiting different tribological effects under conditions such as dry contact, boundary lubrication and full-film lubrication, an in-depth understanding of lubrication and friction properties is essential for selecting the textured surface required for specific conditions (Gachot et al, 2013; Taee et al, 2017; Wu et al, 2017; Ito et al, 2020). Experimental research is applied to obtain the friction or film thickness data of different micro-textured surfaces, and the comparison based on the data is helpful for the selection of micro-texture (Gadeschi et al, 2012; Rosenkranz et al, 2016). Kovalchenko et al (Kovalchenko et al, 2004) conducted a series of experimental studies on micro-

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