First-Body Versus Third-Body: Dialogue Between an Experiment and a Combined Discrete and Finite Element Approach

Renouf, Mathieu; Nhu, Viet Hung; Saulot, Aurélien; Massi, Francesco

doi:10.1115/1.4026062

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…To this aim, accelerometers have been placed on the free surface of the polycarbonate disc to measure the system vibration during sliding and compare the acceleration signals with the numerical ones. The polycarbonate material has been chosen for its photoelastic properties and transparency for the observation of shear stress distribution and third body analysis, reported in [26,32].…”

Section: Methodsmentioning

confidence: 99%

System dynamic instabilities induced by sliding contact: A numerical analysis with experimental validation

Brunetti

Massi

Saulot

et al. 2015

Mechanical Systems and Signal Processing

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Mechanical systems present several contact surfaces between deformable bodies. The contact interface can be either static (joints) or in sliding (active interfaces). The sliding interfaces can have several roles and according to their application they can be developed either for maximizing the friction coefficient and the energy dissipation (e.g. brakes) or rather to allow the relative displacement at joints with a maximum efficiency. In both cases the coupling between system and local contact dynamics can bring to system dynamics instabilities (e.g. brake squeal or squeaking of hip prostheses). This results in unstable vibrations of the system, induced by the oscillation of the contact forces. \ud \ud In the literature, a large number of works deal with such kind of instabilities and are mainly focused on applied problems such as brake squeal noise. This paper shows a more general numerical analysis of a simple system constituted by two bodies in sliding contact: a rigid cylinder rotating inside a deformable one. The parametrical Complex Eigenvalue Analysis and the transient numerical simulations show how the friction forces can give rise to in-plane dynamic instabilities due to the interaction between two system modes, even for such a simple system characterized by one deformable body. Results from transient simulations highlight the key role of realistic values of the material damping to have convergence of the model and, consequently, reliable physical results. To this aim an experimental estimation of the material damping has been carried out. Moreover, the simplicity of the system allows for a deeper analysis of the contact instability and a balance of the energy flux among friction, system vibrations and damping. The numerical results have been validated by comparison with experimental ones, obtained by a specific test bench developed to reproduce and analyze the contact friction instabilities. (C) 2015 Elsevier Ltd. All rights reserved

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Section: Methodsmentioning

confidence: 99%

System dynamic instabilities induced by sliding contact: A numerical analysis with experimental validation

Brunetti

Massi

Saulot

et al. 2015

Mechanical Systems and Signal Processing

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“…Some authors tried to combine discrete elements with finite elements to combine the advantages of both methods [30][31][32]. In particular, the particles of a discrete model are a priori rigid, which is not the case when combining these two methods.…”

Section: Numerical Tribologymentioning

confidence: 99%

How vorticity and agglomeration control shear strength in soft cohesive granular flows

et al. 2022

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Deformable granular flows present complex kinematics. These materials can have various flow regimes: plastic, agglomerated, rigid-like granular flow, etc. In this paper, a multibody meshfree model is used to investigate the consequences of cohesion, stiffness, and viscosity of the particles on their collective sheared flows in tribological contacts. An approach derived from fluid mechanics postprocessing tools, based on vortex detection, is employed to understand the links between these parameters and the emerging friction coefficient of the sheared interface. These results pave the way to complete kinematic studies of third body simulations in tribological contacts.

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“…From Pin-On-Disc to bearing a big gap exists due to the differences in the emulated kinematics. The literature [31][32][33] shows that the degrees of freedom of the system applying the contact conditions have a big impact on the creation and the distribution of the 3rd body inside the contact, which may lead to the opposite results if the tests are conducted on different tribometers, even if similar contact conditions are applied. The 3rd body is essentially composed of the particles detached from the materials initially in contact (called 1st bodies) and circulating inside the contact [34,35].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Friction and Wear of Self-Lubricating Composites Used for Dry Lubrication of Ball Bearing for Space Applications

et al. 2021

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Lubricating space mechanisms are a challenge. Lubrication must be sustained in different environments, for a very long period of time, and without any maintenance possible. This study focuses on the self-lubricating composite used in the double transfer lubrication of ball bearing. Ball/races contacts are lubricated via the transfer of materials from the cage that is made of the composite. A dedicated tribometer has been designed for the study. A specificity of the tribometer is to not fully constrain the composite sample but to let it move, as the cage would do in the bearing. Four composites (PTFE, MoS2, glass or mineral fibers) where tested in ultrahigh vacuum and humid air environments. Transfer was achieved with morphologies and composition similar to what is observed on real bearings. Adhesion measurements performed on composite materials before and after friction allowed one to explain the differences in tribological behaviors observed (transfer quality and contact instabilities). Beyond strengthening the composites, fibers are shown to be critical in trapping mechanically and chemically the transferred material to lubricate and prevent instabilities. Equilibrium between internal cohesion of transferred material, and adhesion to counterparts must be satisfied. Mass spectrometry showed that water appears also critical in the establishment of stable transfer film, even in vacuum.

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First-Body Versus Third-Body: Dialogue Between an Experiment and a Combined Discrete and Finite Element Approach

Cited by 5 publications

References 23 publications

System dynamic instabilities induced by sliding contact: A numerical analysis with experimental validation

System dynamic instabilities induced by sliding contact: A numerical analysis with experimental validation

How vorticity and agglomeration control shear strength in soft cohesive granular flows

Experimental Analysis of Friction and Wear of Self-Lubricating Composites Used for Dry Lubrication of Ball Bearing for Space Applications

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