Multiscale analysis of friction behavior at fretting interfaces

Friction

Jie Song¹  Shuaihang Pan²  Zhinan Zhang³  Nian Yin³  Bin Shen³ 

[1] Institute of Nano Biomedicine and Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China;School of Mechanical & Aerospace Engineering, University of California Los Angeles, 90095, Los Angeles, USA;State Key Laboratory of Mechanical Systems and Vibrations, Shanghai Jiao Tong University, 200240, Shanghai, China;

关键词: molecular dynamics simulation;    friction;    wear;    fretting;   

DOI  :  10.1007/s40544-019-0341-z

来源: Springer

【 摘 要 】

Friction behavior at fretting interfaces is of fundamental interest in tribology and is important in material applications. However, friction has contact intervals, which can accurately determine the friction characteristics of a material; however, this has not been thoroughly investigated. Moreover, the fretting process with regard to different interfacial configurations have also not been systematically evaluated. To bridge these research gaps, molecular dynamics (MD) simulations on Al-Al, diamond-diamond, and diamond-silicon fretting interfaces were performed while considering bidirectional forces. This paper also proposes new energy theories, bonding principles, nanoscale friction laws, and wear rate analyses. With these models, semi-quantitative analyses of coefficient of friction (CoF) were made and simulation outcomes were examined. The results show that the differences in the hardness, stiffness modulus, and the material configuration have a considerable influence on the fretting process. This can potentially lead to the force generated during friction contact intervals along with changes in the CoF. The effect of surface separation can be of great significance in predicting the fretting process, selecting the material, and for optimization.

【 授权许可】

CC BY