Journal
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 477, Issue 2250, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rspa.2021.0103
Keywords
wear; abrasive; atomic force microscope; nanoscale; friction
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Funding
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/R513088/1]
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Using an atomic force microscope, a nanoscale wear characterization method was applied to a commercial steel substrate AISI 52100, revealing two wear mechanisms: atom attrition and elastoplastic ploughing. The study found that the length-scale effect of the material's hardness property plays an integral role in the relationship between the 'degree of wear' and load.
Using an atomic force microscope, a nanoscale wear characterization method has been applied to a commercial steel substrate AISI 52100, a common bearing material. Two wear mechanisms were observed by the presented method: atom attrition and elastoplastic ploughing. It is shown that not only friction can be used to classify the difference between these two mechanisms, but also the 'degree of wear'. Archard's Law of adhesion shows good conformity to experimental data at the nanoscale for the elastoplastic ploughing mechanism. However, there is a distinct discontinuity between the two identified mechanisms of wear and their relation to the load and the removed volume. The length-scale effect of the material's hardness property plays an integral role in the relationship between the 'degree of wear' and load. The transition between wear mechanisms is hardness-dependent, as below a load threshold limited plastic deformation in the form of pile up is exhibited. It is revealed that the presented method can be used as a rapid wear characterization technique, but additional work is necessary to project individual asperity interaction observations to macroscale contacts.
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