Special Issue "Adhesion, Friction and Lubrication of Viscoelastic Materials"

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: 31 July 2019

Special Issue Editors

Guest Editor
Prof. Dr. Giuseppe Carbone

Dipartimento di Meccanica-Matematica-Management DMMM, Campus, Via Orabona 4, 70125 Bari, Italy
Website | E-Mail
Interests: contact mechanics; tribology; wetting and interfaces; applied computational mathematics; automotive systems engineerin; rheology of materials
Guest Editor
Prof. Dr. Francesco Bottiglione

Department of Mechanics, Mathematics and Management, Politecnico di Bari, v.le Japigia 182, 70126 Bari, Italy
Website | E-Mail
Interests: tribology; vehicle dynamics; automotive powertrains

Special Issue Information

Dear Colleagues,

The mechanical behavior of viscoelastic materials affects many physical phenomena occurring at the interface between surfaces of interest in daily life and in industrial applications. Understanding how the interface between a polymer and another fails, or the way a rubber material is able to give some friction force when it comes into sliding contact with a rough surface, and how these phenomena are affected by the interposition of lubricants of any nature, are all topics of great importance in terms of practical applications. In all these cases, dealing with viscoelastic solids intrinsically has a high degree of complexity due to the time-dependent stress–strain relations governing their responses.

The purpose of this Special Issue is to foster the growth of new ideas in the field by discussing the most recent advances in adhesion, friction and lubrication of viscoelastic materials.

We invite authors to submit original research and review articles, which stimulate the continuing efforts to understand and improve knowledge in these fields.

We are particularly interested in theoretical and experimental contributions focusing on fundamental physics, experimental investigations and validations of theories and models of viscoelastic solids on multiple length scales from macro to nano work, including also biomechanical applications and bio-inspired solutions, as well as bio- systems. Potential topics include, but are not limited to:

  • adhesion and adhesion failures of viscoelastic materials
  • contact, lubrication and friction of viscoelastic materials with an emphasis on the contact between rough or structured surfaces
  • advanced numerical techniques to study contact, friction and lubrication of randomly rough viscoelastic interfaces

Prof. Dr. Giuseppe Carbone
Prof. Dr. Francesco Bottiglione
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Lubricants is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 550 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Viscoelasticity
  • Rheology
  • Friction
  • Hysteresis
  • Contact mechanics
  • Mechanical properties
  • Roughness
  • Lubrication

Published Papers (5 papers)

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Research

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Open AccessArticle
Modeling the Contact Mechanics of Hydrogels
Received: 18 February 2019 / Revised: 26 March 2019 / Accepted: 3 April 2019 / Published: 11 April 2019
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Abstract
A computationally lean model for the coarse-grained description of contact mechanics of hydrogels is proposed and characterized. It consists of a simple bead-spring model for the interaction within a chain, potentials describing the interaction between monomers and mold or confining walls, and a [...] Read more.
A computationally lean model for the coarse-grained description of contact mechanics of hydrogels is proposed and characterized. It consists of a simple bead-spring model for the interaction within a chain, potentials describing the interaction between monomers and mold or confining walls, and a coarse-grained potential reflecting the solvent-mediated effective repulsion between non-bonded monomers. Moreover, crosslinking only takes place after the polymers have equilibrated in their mold. As such, the model is able to reflect the density, solvent quality, and the mold hydrophobicity that existed during the crosslinking of the polymers. Finally, such produced hydrogels are exposed to sinusoidal indenters. The simulations reveal a wavevector-dependent effective modulus E * ( q ) with the following properties: (i) stiffening under mechanical pressure, and a sensitivity of E * ( q ) on (ii) the degree of crosslinking at large wavelengths, (iii) the solvent quality, and (iv) the hydrophobicity of the mold in which the polymers were crosslinked. Finally, the simulations provide evidence that the elastic heterogeneity inherent to hydrogels can suffice to pin a compressed hydrogel to a microscopically frictionless wall that is undulated at a mesoscopic length scale. Although the model and simulations of this feasibility study are only two-dimensional, its generalization to three dimensions can be achieved in a straightforward fashion. Full article
(This article belongs to the Special Issue Adhesion, Friction and Lubrication of Viscoelastic Materials)
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Open AccessArticle
Linear and Nonlinear Viscoelastic Modulus of Rubber
Received: 29 January 2019 / Revised: 12 February 2019 / Accepted: 4 March 2019 / Published: 8 March 2019
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Abstract
We study the linear and nonlinear viscoelastic properties of two tire tread compounds. We discuss the difference in nonlinear response between the oscillatory tensile and shear modes. We also analyze strain relaxation (creep) data for the same systems. We discuss what type of [...] Read more.
We study the linear and nonlinear viscoelastic properties of two tire tread compounds. We discuss the difference in nonlinear response between the oscillatory tensile and shear modes. We also analyze strain relaxation (creep) data for the same systems. We discuss what type of measurements are most suitable for obtaining the viscoelastic modulus used in rubber friction calculations. Full article
(This article belongs to the Special Issue Adhesion, Friction and Lubrication of Viscoelastic Materials)
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Open AccessArticle
Modeling Sliding Friction of a Multiscale Wavy Surface over a Viscoelastic Foundation Taking into Account Adhesion
Received: 18 December 2018 / Revised: 21 January 2019 / Accepted: 26 January 2019 / Published: 29 January 2019
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Abstract
A model for calculating the hysteretic friction force for a multilevel wavy surface sliding in dry conditions over the surface of a viscoelastic foundation is suggested, taking into account adhesion force acting in the direction normal to the contact surface. At each scale [...] Read more.
A model for calculating the hysteretic friction force for a multilevel wavy surface sliding in dry conditions over the surface of a viscoelastic foundation is suggested, taking into account adhesion force acting in the direction normal to the contact surface. At each scale level, the contact problem for a 3D periodic wavy indenter is solved by using the strip method to reduce the problem to 2D formulation in a strip. Different regimes of contact and adhesion interaction are possible in each strip, including partial and saturated contact. The friction force is calculated as a sum of two terms. The first term is due to hysteretic losses occurring when asperities of this scale level cyclically deform the viscoelastic foundation during sliding. The second term is the law of friction determined from the solution of the contact problem at the inferior scale level. For the case of a two-level wavy surface, the contribution of both levels into the total friction force is calculated and analyzed depending on the sliding velocity and specific energy of adhesion of the contacting surfaces. Full article
(This article belongs to the Special Issue Adhesion, Friction and Lubrication of Viscoelastic Materials)
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Review

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Open AccessReview
Adhesion and Friction for Three Tire Tread Compounds
Received: 29 January 2019 / Revised: 14 February 2019 / Accepted: 16 February 2019 / Published: 26 February 2019
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Abstract
We study the adhesion and friction for three tire tread rubber compounds. The adhesion study is for a smooth silica glass ball in contact with smooth sheets of the rubber in dry condition and in water. The friction studies are for rubber sliding [...] Read more.
We study the adhesion and friction for three tire tread rubber compounds. The adhesion study is for a smooth silica glass ball in contact with smooth sheets of the rubber in dry condition and in water. The friction studies are for rubber sliding on smooth glass, concrete, and asphalt road surfaces. We have performed the Leonardo da Vinci-type friction experiments and experiments using a linear friction tester. On the asphalt road, we also performed vehicle breaking distance measurements. The linear and non-linear viscoelastic properties of the rubber compounds were measured in shear and tension modes using two different Dynamic Mechanical Analysis (DMA) instruments. The surface topography of all surfaces was determined using stylus measurements and scanned-in silicon rubber replicas. The experimental data were analyzed using the Persson contact mechanics and rubber friction theory. Full article
(This article belongs to the Special Issue Adhesion, Friction and Lubrication of Viscoelastic Materials)
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Other

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Open AccessTechnical Note
Friction of Tungsten-Based Coatings of Steel under Sliding Contact
Received: 6 December 2018 / Revised: 24 January 2019 / Accepted: 28 January 2019 / Published: 31 January 2019
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Abstract
An investigation was made to determine the effects of tungsten surface coating on the coefficient of friction of sliding contact between lubricated steel surfaces. The four-ball test was modified, using a tungsten carbide ball bearing in the spindle to cause sliding contact onto [...] Read more.
An investigation was made to determine the effects of tungsten surface coating on the coefficient of friction of sliding contact between lubricated steel surfaces. The four-ball test was modified, using a tungsten carbide ball bearing in the spindle to cause sliding contact onto three hard steel ball bearings coated with tungsten disulfide lamellar dry lubricant coating, with a coating of grease lubrication applied to the ball bearings. The coatings, loads, speed, and grease level were varied to best understand the impact of different conditions on the friction coefficient. Full article
(This article belongs to the Special Issue Adhesion, Friction and Lubrication of Viscoelastic Materials)
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