On the load-area relation in rough adhesive contacts

It is well established that, at small loads, a linear relation exists between contact area and reduced pressure for elastic bodies with non-adhesive rough surfaces. In the case of adhesive contacts, however, there is not yet a general consensus on whether or not linearity still holds. In this work e...

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Bibliographic Details
Published in:Tribology international 2020-04, Vol.144, p.106099, Article 106099
Main Authors: Khajeh Salehani, M., van Dokkum, J.S., Irani, N., Nicola, L.
Format: Article
Language:English
Subjects:
Adhesion
Adhesives
Cohesive-zone model
Compressibility
Computational fluid dynamics
Computer simulation
Contact area and load
Contact pressure
Elastic bodies
Elastic deformation
Green's functions
Linearity
Molecular dynamics
Plane strain
Self-affine roughness
Two dimensional analysis
Two dimensional bodies
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Summary:It is well established that, at small loads, a linear relation exists between contact area and reduced pressure for elastic bodies with non-adhesive rough surfaces. In the case of adhesive contacts, however, there is not yet a general consensus on whether or not linearity still holds. In this work evidence is provided, through numerical simulations, that the relation is non-linear. The simulations here presented can accurately describe contact between self-affine adhesive rough surfaces, since they rely on Green's function molecular dynamics to describe elastic deformation and on coupled phenomenological traction-separation laws for the interfacial interactions. The analysis is performed for two-dimensional compressible and incompressible bodies under plane strain conditions. Interfaces with various roughness parameters and work of adhesion are considered. •The effect of adhesion during contact is revealed through simulations.•Adhesion is modelled through cohesive traction-separation laws.•The reduced load-to-area relation is found to be non linear.•Adhesion strongly depends on roughness, negligibly on compressibility.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2019.106099