Atomistic mechanism of friction force independence on the normal load and other friction laws for dynamic structural superlubricity
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arXiv
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| Format: | Preprint |
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2023
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| author | Brilliantov, Nikolay V. Tsukanov, Alexey A. Grebenko, Artem K. Nasibulin, Albert G. Ostanin, Igor A. |
| author_facet | Brilliantov, Nikolay V. Tsukanov, Alexey A. Grebenko, Artem K. Nasibulin, Albert G. Ostanin, Igor A. |
| contents | We explore dynamic structural superlubricity for the case of a relatively large contact area, where the friction force is proportional to the area (exceeding $\sim 100\,nm^2$) experimentally, numerically, and theoretically. We use a setup comprised of two molecular smooth incommensurate surfaces -- graphene-covered tip and substrate. The experiments and MD simulations demonstrate independence of the friction force on the normal load, for a wide range of normal loads and relative surface velocities. We propose an atomistic mechanism of this phenomenon, associated with synchronic out-of-plane surface fluctuations of thermal origin, and confirm it by numerical experiments. Based on this mechanism, we develop a theory for this type of superlubricity and show that friction force increases linearly with increasing temperature and relative velocity, for velocities, larger than a threshold velocity. The MD results are in a fair agreement with predictions of the theory. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_11173 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Atomistic mechanism of friction force independence on the normal load and other friction laws for dynamic structural superlubricity Brilliantov, Nikolay V. Tsukanov, Alexey A. Grebenko, Artem K. Nasibulin, Albert G. Ostanin, Igor A. Computational Physics Soft Condensed Matter We explore dynamic structural superlubricity for the case of a relatively large contact area, where the friction force is proportional to the area (exceeding $\sim 100\,nm^2$) experimentally, numerically, and theoretically. We use a setup comprised of two molecular smooth incommensurate surfaces -- graphene-covered tip and substrate. The experiments and MD simulations demonstrate independence of the friction force on the normal load, for a wide range of normal loads and relative surface velocities. We propose an atomistic mechanism of this phenomenon, associated with synchronic out-of-plane surface fluctuations of thermal origin, and confirm it by numerical experiments. Based on this mechanism, we develop a theory for this type of superlubricity and show that friction force increases linearly with increasing temperature and relative velocity, for velocities, larger than a threshold velocity. The MD results are in a fair agreement with predictions of the theory. |
| title | Atomistic mechanism of friction force independence on the normal load and other friction laws for dynamic structural superlubricity |
| topic | Computational Physics Soft Condensed Matter |
| url | https://arxiv.org/abs/2311.11173 |