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A fractal view on running-in process: taking steel-on-steel tribo-system as an example

Yuankai Zhou (School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China; and School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, China and Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment, Jiangsu University of Science and Technology, Zhenjiang, China)
Xue Zuo (School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China and Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment, Jiangsu University of Science and Technology, Zhenjiang, China)
Hua Zhu (School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 7 May 2019

Issue publication date: 7 May 2019

101

Abstract

Purpose

Running-in is a transient process prior to steady state and of great importance for mechanical performance. To reveal the fractal behavior in the running-in process, the steel-on-steel friction and wear tests were performed.

Design/methodology/approach

The friction coefficient, friction temperature, friction noise and vibration were recorded, and the surface profile of lower sample was measured on line. The signals and profiles were characterized by correlation dimension and box-counting dimension, respectively.

Findings

The signals have the consistent fractal evolvement law, that is, the correlation dimension increases and tends to a stable value. The box-counting dimension of one surface becomes close to that of the other surface. The running-in process can be interpreted as a process in which the fractal dimension of friction signals increases, and the counter surfaces spontaneously adapt to and modify each other to form a spatial ordered structure.

Originality/value

The results reveal the running-in behavior from a new perspective.

Keywords

Acknowledgements

The project is supported by the National Natural Science Foundation of China (Grant Nos 51705216 and 51775546), Nature Science Foundation of Jiangsu Province (Grant No. BK20170584) and China Postdoctoral Science Foundation (No. 2017M621863).

Citation

Zhou, Y., Zuo, X. and Zhu, H. (2019), "A fractal view on running-in process: taking steel-on-steel tribo-system as an example", Industrial Lubrication and Tribology, Vol. 71 No. 4, pp. 557-563. https://doi.org/10.1108/ILT-08-2018-0319

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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