Modelling third body flows with a discrete element method—a tool for understanding wear with adhesive particles

Fillot, Nicolas; Iordanoff, Ivan; Berthier, Yves

doi:10.1016/j.triboint.2006.02.056

Cited by 107 publications

(54 citation statements)

References 17 publications

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“…Other authors applied a Cellular Automata (CA) approach for describing the dynamics of contact patch formation and destruction during automotive braking [85,86]. A Discrete Element Model (DEM), which is well adapted to Godet's concept of the formation, mixing and flow of wear particles was suggested by Fillot et al [87,88]. The most important parameter of this model is adhesion between nanoparticles.…”

Section: Modelling Of the Sliding Behavior Of Tribofilms Formed Durinmentioning

confidence: 99%

The Role of Solid Lubricants for Brake Friction Materials

Österle

Дмитриев

2016

Lubricants

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This review article comprises of three parts. Firstly, reports of brake manufacturers on the beneficial impact of solid lubricants for pad formulations are surveyed. Secondly, since tribofilms were identified to play a crucial role in friction stabilization and wear reduction, the knowledge about tribofilm structures formed during automotive braking was reviewed comprehensively. Finally, a model for simulating the sliding behavior of tribofilms is suggested and a review on modelling efforts with different model structures related to real tribofilms will be presented. Although the variety of friction composites involved in commercial brake systems is very broad, striking similarities were observed in respect to tribofilm nanostructures. Thus, a generalization of the tribofilm nanostructure is suggested and prerequisites for smooth sliding performance and minimal wear rates have been identified. A minimum of 13 vol % of soft inclusions embedded in an iron oxide based tribofilm is crucial for obtaining the desired properties. As long as the solid lubricants or their reaction products are softer than magnetite, the main constituent of the tribofilm, the model predicts smooth sliding and minimum wear.

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Section: Modelling Of the Sliding Behavior Of Tribofilms Formed Durinmentioning

confidence: 99%

The Role of Solid Lubricants for Brake Friction Materials

Österle

Дмитриев

2016

Lubricants

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“…It has been suggested that cylindrical debris can act as miniature roller bearings or "solid lubricants", so that sliding friction can be reduced [32]. The presence of particles has an influence on a progress of the wear process (see [33]). …”

Section: Modifications Of Friction In the Presence Of Wear Debrismentioning

confidence: 99%

Contact stresses: a short survey of models and methods of computations

Zmitrowicz

2009

Arch Appl Mech

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Contact stresses are identified as normal and tangential forces between contacting solids. The normal stresses are modeled using unilateral and complementary conditions, elastic response and normal compliance. Friction laws describe the tangential traction. Friction of materials depends on pressure, sliding velocity, surface temperature, time of contact, surface roughness and presence of wear debris. Phenomenological, micromechanical and atomic-scale models as well as non-classical models of anisotropic and heterogeneous friction are important steps in the development of friction modeling. Sophisticated friction models are desirable in vibrating systems, materials processing, rolling contacts, rubber and polymers, geomechanics, bioengineering and living systems. Main numerical methods in contact mechanics are: finite element method, boundary element method and discrete element method. To include specific contact constraints, the following computing techniques are applied: Lagrange multipliers, penalty function, perturbated and augmented Lagrangian methods, mathematical programming methods. The advances of adhesion and impact modeling are outlined in this paper.

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“…The DEM was originally developed for granular assemblies [35] but its applications have been expanded these last years to other areas such as tribology [36], fluid mechanics [37], and continuum mechanics [38]. The GranOO workbench [39,40], developed in the laboratory, is naturally chosen.…”

Section: The Discrete Elementmentioning

confidence: 99%

Experimental Investigation and Discrete Element Modelling of Composite Hollow Spheres Subjected to Dynamic Fracture

Coré

Kopp

Viot

et al. 2017

International Journal of Polymer Science

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This paper deals with the characterization and the numerical modelling of the collapse of composite hollow spherical structures developed to absorb energy during high velocity impacts. The structure is composed of hollow spheres ( = 2-30 mm) made of epoxy resin and mineral powder. First of all, quasi-static and dynamic (V = 5 mm⋅min −1 to V = 2 m⋅s −1 ) compression tests are conducted at room temperature on a single sphere to study energy dissipation mechanisms. Fracture of the material appears to be predominant. A numerical model based on the discrete element method is investigated to simulate the single sphere crushing. The stress-strain-time relationship of the material based on the Ree-Eyring law is numerically implemented. The DEM modelling takes naturally into account the dynamic fracture and the crack path computed is close to the one observed experimentally in uniaxial compression. Eventually, high velocity impacts (V > 100 m⋅s −1 ) of a hollow sphere on a rigid surface are conducted with an air cannon. The numerical results are in good agreement with the experimental data and demonstrate the ability of the present model to correctly describe the mechanical behavior of brittle materials at high strain rate.

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Modelling third body flows with a discrete element method—a tool for understanding wear with adhesive particles

Cited by 107 publications

References 17 publications

The Role of Solid Lubricants for Brake Friction Materials

The Role of Solid Lubricants for Brake Friction Materials

Contact stresses: a short survey of models and methods of computations

Experimental Investigation and Discrete Element Modelling of Composite Hollow Spheres Subjected to Dynamic Fracture

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