Contact of rough surfaces: Modeling adhesion in advanced multiasperity models

2021

Lubricants

Self Cite

It is known that in the presence of surface roughness, adhesion can lead to distinct paths of loading and unloading for the area–load and penetration–load relationships, thus causing hysteretic loss. Here, we investigate the effects that the surface roughness parameters have on such adhesive hysteresis loss. We focus on the frictionless normal contact between soft elastic bodies and, for this reason, we model adhesion according to Johnson, Kendall, and Roberts (JKR) theory. Hysteretic energy loss is found to increase linearly with the true area of contact, while the detachment force is negligibly influenced by the maximum applied load reached at the end of the loading phase. Moreover, for the micrometric roughness amplitude hrms considered in the present work, adhesion hysteresis is found to be affected by the shorter wavelengths of roughness. Specifically, hysteresis losses decrease with increasing fractal dimension and cut-off frequency of the roughness spectrum. However, we stress that a different behavior could occur in other ranges of roughness amplitude.

Section: Adhesive Hysteresis and Pull-off Force: Effect Of Loading Parameterssupporting

confidence: 88%

Roughness-Induced Adhesive Hysteresis in Self-Affine Fractal Surfaces

2021

Lubricants

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“…In this limit, a DMT-type solution [19] may be preferred to a JKR one, as remarked already in Ref. [16,20,21].…”

Section: Introductionmentioning

confidence: 61%

A note on the effect of surface topography on adhesion of hard elastic rough bodies with low surface energy

Demelio

Journal of the Mechanical Behavior of Materials

2019

Adhesion between bodies is strongly influenced by surface roughness. In this note, we try to clarify how the statistical properties of the contacting surfaces affect the adhesion under the assumption of long-range adhesive interactions.Specifically, we show that the adhesive interactions are influenced only by the roughness amplitude hrms, while the rms surface gradient h0rmsonly affects the non-adhesive contact force. This is a remarkable result if one takes into account the intrinsic difficulty in defining $h_{\mathrm{rms}}^{^{\prime }}.$Results are also corroborated by a comparison with self-consistent numerical calculations.

“…first time in Ref. [17], is an advanced multiasperity based model, which showed to be quite accurate and efficient in predicting the main contact quantities of adhesiveless [12,18] and DMT-type adhesive [23][24][25] rough contacts.…”

Section: The Modelmentioning

confidence: 99%

Modeling the Adhesive Contact of Rough Soft Media with an Advanced Asperity Model

2019

Tribol Lett

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Adhesive interactions strongly characterize the contact mechanics of soft bodies as they lead to large elastic deformations and contact instabilities.In this paper, we extend the Interacting and Coalescing Hertzian Asperities (ICHA) model to the case of adhesive contact. Adhesion is modeled according to an improved version of the Johnson, Kendall & Roberts (JKR) theory, in which jump-in contact instabilities are conveniently considered as well as the lateral interaction of the asperities and the coalescence of merging contact spots.Results obtained on complex fractal geometries with several length scales are accurate as demonstrated by the comparison with fully numerical simulations and experimental investigations taken from the literature. Also, the model quite well captures the distributions of the contact stresses, gaps, and contact spots.