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| Molecular Dynamic Simulations of the Stick--Slip Phenomenon on the Surface of Cu Single CrystaL |
| CHENG Dong; YAN Zhijun;YAN Li |
| Marine Engineering College; Dalian Maritime University; Dalian 116026 |
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Cite this article:
CHENG Dong; YAN Zhijun; YAN Li. Molecular Dynamic Simulations of the Stick--Slip Phenomenon on the Surface of Cu Single CrystaL. Acta Metall Sin, 2006, 42(11): 1149-1152 .
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Abstract The mechanisms of micro stick-slip phenomenon were investigated with the 3D Molecular Dynamics Simulations (MDS) of single-asperity dry friction on homogeneous Cu. At the atomic scale, the regular arrangement of atoms on the sliding surfaces makes a large and a small “sawtooth” displayed in the friction force curve. This can be explained by the appearance and disappearance of the dislocations on the sliding surfaces. The magnitudes of “sawtooth” depend on the load, sliding speed, and the lattice difference across the sliding surface. The higher the load, the more atoms to be moved during dry friction, and the less the magnitude of the small “sawtooth”. The magnitude of the small “sawtooth” is linear to the sliding speed. The stick-slip phenomenon varies at different sliding surfaces and different sliding directions, but the period of the “sawtooth” is just the lattice constant of the substrate along the sliding direction.
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Received: 29 March 2006
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