Predicting frictional aging from bulk relaxation measurements
Abstract The coefficient of static friction between solids normally increases with the time they have remained in static contact before the measurement. This phenomenon, known as frictional aging, is at the origin of the difference between static and dynamic friction coefficients but has remained di...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-06-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-39350-3 |
| _version_ | 1797801408849772544 |
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| author | Kasra Farain Daniel Bonn |
| author_facet | Kasra Farain Daniel Bonn |
| author_sort | Kasra Farain |
| collection | DOAJ |
| description | Abstract The coefficient of static friction between solids normally increases with the time they have remained in static contact before the measurement. This phenomenon, known as frictional aging, is at the origin of the difference between static and dynamic friction coefficients but has remained difficult to understand. It is usually attributed to a slow expansion of the area of atomic contact as the interface changes under pressure. This is however challenging to quantify as surfaces have roughness at all length scales. In addition, friction is not always proportional to the contact area. Here we show that the normalized stress relaxation of the surface asperities during frictional contact with a hard substrate is the same as that of the bulk material, regardless of the asperities’ size or degree of compression. This result enables us to predict the frictional aging of rough interfaces based on the bulk material properties of two typical polymers: polypropylene and polytetrafluoroethylene. |
| first_indexed | 2024-03-13T04:50:01Z |
| format | Article |
| id | doaj.art-ee9a1f044bc045cfa3c93e725a11d6d4 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-13T04:50:01Z |
| publishDate | 2023-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-ee9a1f044bc045cfa3c93e725a11d6d42023-06-18T11:17:53ZengNature PortfolioNature Communications2041-17232023-06-011411610.1038/s41467-023-39350-3Predicting frictional aging from bulk relaxation measurementsKasra Farain0Daniel Bonn1Van der Waals–Zeeman Institute, Institute of Physics, University of AmsterdamVan der Waals–Zeeman Institute, Institute of Physics, University of AmsterdamAbstract The coefficient of static friction between solids normally increases with the time they have remained in static contact before the measurement. This phenomenon, known as frictional aging, is at the origin of the difference between static and dynamic friction coefficients but has remained difficult to understand. It is usually attributed to a slow expansion of the area of atomic contact as the interface changes under pressure. This is however challenging to quantify as surfaces have roughness at all length scales. In addition, friction is not always proportional to the contact area. Here we show that the normalized stress relaxation of the surface asperities during frictional contact with a hard substrate is the same as that of the bulk material, regardless of the asperities’ size or degree of compression. This result enables us to predict the frictional aging of rough interfaces based on the bulk material properties of two typical polymers: polypropylene and polytetrafluoroethylene.https://doi.org/10.1038/s41467-023-39350-3 |
| spellingShingle | Kasra Farain Daniel Bonn Predicting frictional aging from bulk relaxation measurements Nature Communications |
| title | Predicting frictional aging from bulk relaxation measurements |
| title_full | Predicting frictional aging from bulk relaxation measurements |
| title_fullStr | Predicting frictional aging from bulk relaxation measurements |
| title_full_unstemmed | Predicting frictional aging from bulk relaxation measurements |
| title_short | Predicting frictional aging from bulk relaxation measurements |
| title_sort | predicting frictional aging from bulk relaxation measurements |
| url | https://doi.org/10.1038/s41467-023-39350-3 |
| work_keys_str_mv | AT kasrafarain predictingfrictionalagingfrombulkrelaxationmeasurements AT danielbonn predictingfrictionalagingfrombulkrelaxationmeasurements |