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The bundle structure formed perpendicular to the scratching direction is a type of wear-induced structure for thermoplastics. In this study, the formation mechanism of bundle structures on polycarbonate (PC) surfaces is investigated by reciprocal scratching experiments. Based on the analysis of the morphologies, friction forces, and height signals, the formation of the bundle structure is reproduced. The influence of scratching parameters, including the feed value and scratching direction, on the formation of the bundle structure is also studied. It is found that the bundle structure is accumulated by the continuous stacking of the sample materials plowed by the tip in stick–slip motion, and that the stick–slip behavior is enhanced with increased scratching times. This work reproduces the formation process of bundle structure in experiments for the first time and demonstrates that the stick–slip enhancement mechanism exists in the reciprocal scratching process, providing further insight into the friction behavior of polymers.


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Towards understanding the surface rippling process by periodic reciprocal nanoscratching

Show Author's information Zihan LI1,2Yongda YAN1,2Jiqiang WANG1,2Chen LI1Yanquan GENG1,2( )
State Key Laboratory of Robotics and Systems, Robotics Institute, Harbin Institute of Technology, Harbin 150080, China
Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract

The bundle structure formed perpendicular to the scratching direction is a type of wear-induced structure for thermoplastics. In this study, the formation mechanism of bundle structures on polycarbonate (PC) surfaces is investigated by reciprocal scratching experiments. Based on the analysis of the morphologies, friction forces, and height signals, the formation of the bundle structure is reproduced. The influence of scratching parameters, including the feed value and scratching direction, on the formation of the bundle structure is also studied. It is found that the bundle structure is accumulated by the continuous stacking of the sample materials plowed by the tip in stick–slip motion, and that the stick–slip behavior is enhanced with increased scratching times. This work reproduces the formation process of bundle structure in experiments for the first time and demonstrates that the stick–slip enhancement mechanism exists in the reciprocal scratching process, providing further insight into the friction behavior of polymers.

Keywords: atomic force microscopy (AFM), stick–slip, bundle structures, friction force

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Publication history

Received: 27 April 2022
Revised: 27 June 2022
Accepted: 19 September 2022
Published: 03 February 2023
Issue date: October 2023

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© The author(s) 2022.

Acknowledgements

The authors gratefully acknowledge the financial supports of the Natural Science Foundation of Heilongjiang Province of China (YQ2020E015), Science and Technology Based for Equipment Design and Manufacturing for Introduction Talents of Discipline to Universities 2.0 of the 111 Project (BP0719002), Self-planned Task of State Key Laboratory of Robotics and Systems, Harbin Institute of Technology (SKLRS202001C), Young Elite Scientist Sponsorship Program by China Association for Science and Technology (YESS20200155), and the Fundamental Research Funds for the Central Universities (FRFCU5710050521 and FRFCU5710091220).

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