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Friction phenomena in a two-dimensional Frenkel-Kontorova model |
Lin Mai-Mai(林麦麦)a)†, Duan Wen-Shan(段文山)a), and Chen Jian-Min(陈建敏)b) |
a Department of Physics, Northwest Normal University, Lanzhou 730070, China; b State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract By using the molecular dynamic simulation method with a fourth-order Runge--Kutta algorithm, a two-dimensional dc- and ac-driven Frenkel--Kontorova (FK) model with a square symmetry substrate potential for a square lattice layer has been investigated in this paper. For this system, the effects of many different parameters on the average velocity and the static friction force have been studied. It is found that not only the amplitude and frequency of ac-driven force, but also the direction of the external driving force and the misfit angle between two layers have some strong influences on the static friction force. It can be concluded that the superlubricity phenomenon appears easily with a larger ac amplitude and lower ac frequency for some special direction of the external force and misfit angle.
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Received: 12 June 2009
Revised: 10 July 2009
Accepted manuscript online:
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PACS:
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62.20.Qp
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(Friction, tribology, and hardness)
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81.40.Pq
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(Friction, lubrication, and wear)
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61.50.Ah
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(Theory of crystal structure, crystal symmetry; calculations and modeling)
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Fund: Project supported by the National
Natural Science Foundation of China (Grand Nos. 50575217, 10875098
and 50421502), and the Natural Science Foundation of Northwest
Normal University (Grant Nos. NWNU-KJCXGC-03-17 and
NWNU-KJCXGC-03-48). |
Cite this article:
Lin Mai-Mai(林麦麦), Duan Wen-Shan(段文山), and Chen Jian-Min(陈建敏) Friction phenomena in a two-dimensional Frenkel-Kontorova model 2010 Chin. Phys. B 19 026201
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