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The Running-in Micro-Mechanism and Efficient Work Conditions of Cu-Based Friction Material against 65Mn Steel

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Abstract

In order to investigate the running-in process of a dry friction pair made of Cu-based powder metallurgy material and 65Mn steel, well designed pin-on-disc tests are carried out. According to the running-in mechanism of Cu-based powder metallurgy material in the tests, the running-in process is divided into two periods, namely, the interface matching period and the plastic deformation period. Then, two division indexes (the average height Sa and the root mean square height Sq) are introduced as basis for dividing this two periods, which originate from the extraction and analysis of surface morphology of asperities on the contacting surface. In the same way, two running-in recognition indexes, including equivalent changing rate H and coefficient of variation D, are further put forward as measures to characterize the running-in progress, and their effectiveness is verified by tests. Based on the recognition indexes H and D, the influence of temperature, rotation speed and load on the running-in duration of the dry friction pair is studied, and the efficient condition of running-in process is obtained. The results show that, when H ≤ 1.9 × 10−3 and D ≤ 4.2 × 10−2, we can recognise that the running-in process is completed. The running-in duration is almost the shortest under the condition of (40 N, 1400 r/min, 160 °C), which is called the efficient running-in condition.

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Acknowledgements

This research was partly supported by the Natural Science Foundation of China (Grants No. 51575042 and 51775045) and by the International Graduate Exchange Program of Beijing Institute of Technology.

Funding

The Natural Science Foundation of China (No.51575042 and No.51775045).

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Authors and Affiliations

  1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China

    J. Wu & B. Ma

  2. Department of Mechanical Engineering, Rice University, Houston, TX, 77005, USA

    J. Wu & I. Stanciulescu

  3. School of Mechanical Engineering, Shenzhen Technology University, Shenzhen, 518118, China

    H. Li

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  1. J. Wu
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  2. B. Ma
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  3. H. Li
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  4. I. Stanciulescu
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Correspondence to J. Wu.

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Wu, J., Ma, B., Li, H. et al. The Running-in Micro-Mechanism and Efficient Work Conditions of Cu-Based Friction Material against 65Mn Steel. Exp Tech 43, 667–676 (2019). https://doi.org/10.1007/s40799-019-00323-1

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  • DOI: https://doi.org/10.1007/s40799-019-00323-1

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