Abstract
The shear strength at the interface contributes to the overall friction force experienced by the contacting bodies sliding against each other. In this article, an experimental technique to characterize the shear strength at the interface of metallic bodies in sliding contact has been developed. The boundary layers formed at interface in a lubricating contact have been varied by using two different types of lubricants in combination with both zinc coated and uncoated steel sheets. The empirical relations between the experimental parameters such as contact pressure and sliding velocity and the interfacial shear strength have been expressed by fitting the experimental results. These expressions have been incorporated in the Material Point Method (MPM) based ploughing model. The coefficient of friction and ploughing depth obtained from the numerical simulations have been validated relative to the experimental results with a good agreement for both lubricated and unlubricated substrates, different loads and spherical indenter sizes. Furthermore, the interfacial shear strength has been varied in the MPM-based ploughing model and ploughing experiments to study the contribution of interfacial shear strength to overall friction, deformation and wear.
Highlights
Most metallic surfaces are naturally covered by an oxide layer as well as a boundary layer when lubricated
In the absence of a lubricating boundary layer, metallic oxide films are typically formed at the contact which contributes to a higher interfacial shear strength
The interfacial shear strength of both lubricated and unlubricated, zinc coated and uncoated steel sheet have been determined by the experimental method, discussed
Summary
Most metallic surfaces are naturally covered by an oxide layer as well as a boundary layer when lubricated. Shear takes place at these surface layers when a tangential load is applied. In the absence of a lubricating boundary layer, metallic oxide films are typically formed at the contact which contributes to a higher interfacial shear strength. In the absence of any interfacial layer, direct contact between sliding bodies results in a very high interfacial shear strength which might almost equal the bulk shear strength of the deforming substrate. The interfacial shear strength along with the resistance of the substrate to plastic deformation of the substrate contributes to the overall friction and wear in sliding of a rigid asperity through a metallic substrate [1]
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