Single asperity friction in the wear regime
Abstract We used molecular dynamics simulation to investigate the friction of a single asperity against a rigid substrate, while generating debris. In the low wear regime (i.e., non-linear wear rate dependence on the contact stress, via atom-by-atom attrition), the frictional stress is linearly depe...
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| Language: | English |
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Tsinghua University Press
2018-08-01
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| Series: | Friction |
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| Online Access: | http://link.springer.com/article/10.1007/s40544-018-0239-1 |
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| author | Yongjian Yang Yunfeng Shi |
| author_facet | Yongjian Yang Yunfeng Shi |
| author_sort | Yongjian Yang |
| collection | DOAJ |
| description | Abstract We used molecular dynamics simulation to investigate the friction of a single asperity against a rigid substrate, while generating debris. In the low wear regime (i.e., non-linear wear rate dependence on the contact stress, via atom-by-atom attrition), the frictional stress is linearly dependent on the normal stress, without any lubrication effect from the wear debris particles. Both the slope (friction coefficient) and friction at zero normal stress depend strongly on asperity-substrate adhesion. In the high wear regime (i.e., linear wear rate dependence on the contact stress, via plastic flow), the friction-normal stress curves deviate from a linear relation merging toward plastic flow of the single asperity which is independent of the interfacial adhesion. One can further link wear and friction by considering debris generation as chemical reaction, driven by both normal and frictional forces. The coupling between wear and friction can then be quantified by a thermodynamic efficiency of the debris generation. While the efficiency is less than 5% in the low wear regime, indicating poor mechanochemical coupling, it increases with normal stress toward 50% in the high wear regime. |
| format | Article |
| id | doaj-art-0fc18a0db4a0426bac67e6cc7298d5b4 |
| institution | Kabale University |
| issn | 2223-7690 2223-7704 |
| language | English |
| publishDate | 2018-08-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Friction |
| spelling | doaj-art-0fc18a0db4a0426bac67e6cc7298d5b42025-08-20T03:54:20ZengTsinghua University PressFriction2223-76902223-77042018-08-016331632210.1007/s40544-018-0239-1Single asperity friction in the wear regimeYongjian Yang0Yunfeng Shi1Department of Materials Science and Engineering, Rensselaer Polytechnic InstituteDepartment of Materials Science and Engineering, Rensselaer Polytechnic InstituteAbstract We used molecular dynamics simulation to investigate the friction of a single asperity against a rigid substrate, while generating debris. In the low wear regime (i.e., non-linear wear rate dependence on the contact stress, via atom-by-atom attrition), the frictional stress is linearly dependent on the normal stress, without any lubrication effect from the wear debris particles. Both the slope (friction coefficient) and friction at zero normal stress depend strongly on asperity-substrate adhesion. In the high wear regime (i.e., linear wear rate dependence on the contact stress, via plastic flow), the friction-normal stress curves deviate from a linear relation merging toward plastic flow of the single asperity which is independent of the interfacial adhesion. One can further link wear and friction by considering debris generation as chemical reaction, driven by both normal and frictional forces. The coupling between wear and friction can then be quantified by a thermodynamic efficiency of the debris generation. While the efficiency is less than 5% in the low wear regime, indicating poor mechanochemical coupling, it increases with normal stress toward 50% in the high wear regime.http://link.springer.com/article/10.1007/s40544-018-0239-1single-asperity contactfrictionmolecular dynamicsatomic wearplastic wear |
| spellingShingle | Yongjian Yang Yunfeng Shi Single asperity friction in the wear regime Friction single-asperity contact friction molecular dynamics atomic wear plastic wear |
| title | Single asperity friction in the wear regime |
| title_full | Single asperity friction in the wear regime |
| title_fullStr | Single asperity friction in the wear regime |
| title_full_unstemmed | Single asperity friction in the wear regime |
| title_short | Single asperity friction in the wear regime |
| title_sort | single asperity friction in the wear regime |
| topic | single-asperity contact friction molecular dynamics atomic wear plastic wear |
| url | http://link.springer.com/article/10.1007/s40544-018-0239-1 |
| work_keys_str_mv | AT yongjianyang singleasperityfrictioninthewearregime AT yunfengshi singleasperityfrictioninthewearregime |