References of "Magnée, Adrien"
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See detailA pendulum test as a tool to evaluate viscous friction parameters in the equine fetlock joint
Noble, Prisca ULg; Lumay, Geoffroy ULg; Coninx, Marc ULg et al

in Veterinary Journal (2011), 188(2), 204-209

An equine fetlock joint pendulum test was studied and the influence of post mortem time and intra-articular lipid solvent on the viscous frictional response examined. Fresh equine digits (group 1, n=6 ... [more ▼]

An equine fetlock joint pendulum test was studied and the influence of post mortem time and intra-articular lipid solvent on the viscous frictional response examined. Fresh equine digits (group 1, n=6 controls; group 2, n=6 lipid solvent) were mounted on a pendulum tribometer. Assuming that pendular joint damping could be modelled by a harmonic oscillator fluid damping (HOFD), damping time (τ), viscous damping coefficient (c) and friction coefficient (μ) were monitored for 5h under experimental conditions (400N; 20°C). In all experiments, pendular joint damping was found to follow an exponential decay function (R(2)=0.99714), which confirmed that joint damping was fluid. The evolution of τ, c and μ was found to be significantly (P<0.05) different in the two groups, with a decrease in τ and an increase in c and μ that was faster and more prominent in digits from group 2. It was concluded that pendular joint damping could be modelled by a HOFD model. The influence of post mortem time on results suggested that, ideally, joint mechanical properties should only be tested on fresh cadavers at the same post mortem time. Moreover, the addition of lipid solvent was found to be responsible for upper viscous friction parameters and for a reduced damping time, which suggested that articular lubricating ability was compromised. This equine pendulum test could be used to test the efficacy of various bio-lubricant treatments. [less ▲]

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See detailAn equine joint friction test model using a cartilage-on-cartilage arrangement.
Noble, Prisca ULg; Collin, Bernard ULg; Lecomte-Beckers, Jacqueline ULg et al

in Veterinary Journal (2010)

This study describes an equine joint friction test using a cartilage-on-cartilage arrangement and investigates the influence of age and load on the frictional response. Osteochondral plugs were extracted ... [more ▼]

This study describes an equine joint friction test using a cartilage-on-cartilage arrangement and investigates the influence of age and load on the frictional response. Osteochondral plugs were extracted from equine shoulder joints (2-5 years, n=12; 10-14 years, n=15), and mounted in a pin-on-disc tribometer. The frictional response was then measured under constant conditions (2N; 20 degrees C; 5 mm/s), and with increasing load (2N, 5N, 10N). In all experiments, the friction coefficient of young cartilage was significantly (P<0.001) smaller than obtained from old cartilage, while the application of a greater load resulted in a significant (P<0.001) decrease in friction coefficient only in old cartilage. It was concluded that cartilage ageing was responsible for an increase in friction coefficient under these experimental conditions. Moreover, where young cartilage lubrication remained stable, cartilage ageing may have been responsible for lubrication regime change. The cartilage-on-cartilage model could be used to better understand lubrication regime disturbances in healthy and diseased equine joints, and to test the efficacy of various bio-lubricant treatments. [less ▲]

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See detailL'articulation synoviale : un systeme tribologique parfait
Noble, Prisca ULg; Collin, Bernard ULg; Lecomte-Beckers, Jacqueline ULg et al

in Annales de Médecine Vétérinaire (2010), 154(2), 83-93

The synovial joint, by load bearing and by minimal wear and minimal friction conferring, is considered as a perfect tribological system. During these last years, researchs in articular biomechanics have ... [more ▼]

The synovial joint, by load bearing and by minimal wear and minimal friction conferring, is considered as a perfect tribological system. During these last years, researchs in articular biomechanics have been performed to study how the joint friction coefficient, a dimensionless measure which represents the ratio between the frictional force on the normal force, was close to zero. Today, there is still no consensual explanation and the articular prosthesis partially imitates the biological mechanics. This review describes the composition and the general properties of the synovial joint components. Additionally, different theorical models, on the tribology of the articular triplex cartilage-synovial fluid-cartilage, are explained. [less ▲]

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See detailNew Cold Plasma and DLC Surface Treatments for Medical Co-Cr-Mo and Ti-6Al-4V Prostheses
Matarazzo, Lucas; Gillet, Marie-Claire ULg; Forest, B et al

Poster (2006, September 27)

Recent studies indicate that the most important factor limiting the longevity of hip prostheses is the production of wear particles from the prosthetic components. We have studied the effect of two ... [more ▼]

Recent studies indicate that the most important factor limiting the longevity of hip prostheses is the production of wear particles from the prosthetic components. We have studied the effect of two surface treatment techniques on the Ti-6Al-4V alloy: ionic nitruration (cold plasma) and Diamond-like Coating (DLC). These two techniques create a layer of 7-8 μm in depth on the surface of the alloy, modifying its structure and hardening it considerably. Biocompatibility was analyzed using cellular culture to compare viability, proliferation (DNA quantification) and differentiation (ALP assay) of human osteoblast-like cells (MG 63) as well as cellular adhesion of human fibroblasts (WI 38) or osteoblasts, under SEM. [less ▲]

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See detailMicrostructural study of oxides and carbides used for abrasion properties in high alloyed steels
Lecomte-Beckers, Jacqueline ULg; Magnée, Adrien ULg

in Proceedings of the 8th International Conference on Composites Engineering (2001)

For long applications and for many others, a material with properties between hard metal and high speed steel is necessary. This material should have a high resistance to wear together with good toughness ... [more ▼]

For long applications and for many others, a material with properties between hard metal and high speed steel is necessary. This material should have a high resistance to wear together with good toughness. An attractive solution consists in combining in a composite the properties of a tough ferrous matrix with those of hard reinforced particles. In varying the nature and the proportions of reinforcement and matrix, the properties of the composite can cover many applications. [less ▲]

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See detailMicrostructure and abrasion resistance of tool steels reinforced by dispersed oxides and carbides phases
Magnée, Adrien ULg; Lecomte-Beckers, Jacqueline ULg

in Revue de Métallurgie- Journées d'Automne de la Société Française de Métallurgie et de Matériaux (2000)

Two ferrous matrix, a high speed steel and a maraging steel were reinforced with alumina, titanium and vanadium carbides. The composite was realized by powder metallurgy. The particles were mechanically ... [more ▼]

Two ferrous matrix, a high speed steel and a maraging steel were reinforced with alumina, titanium and vanadium carbides. The composite was realized by powder metallurgy. The particles were mechanically mixed with the prealloyed powder before compaction. To optimize the composite properties, the processing parameters (i.e. prealloyed powders, size, mixing, conditions, temperature of sintering,...) and the effect of reinforcement (size and composition of particles, volume, fraction,...) were studied. It is necessary to obtain full density with minimum porosity and to control the size, distribution and dispersion of the reinforced particles. The optimal sintering temperature depends on the reinforcement particles used and is of great importance for the properties. Processing parameters (mixing of particles) can greatly affect the final properties. The use of AL2O3 was shown to increases wear resistance in the two matrix. [less ▲]

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See detailMicrostructure and properties of PM steel reinforced by dispersed oxides and carbides phases
Lecomte-Beckers, Jacqueline ULg; Magnée, Adrien ULg

in Proceedings of ECCM-8, European Conference on Composite Materials : Science, Technologies and Applications (1998)

Two ferrous matrix, a high speed steel and a maraging steel has been reinforced with alumina, titanium and vanadium carbides. The composite was realized by powder metallurgy.The particles were ... [more ▼]

Two ferrous matrix, a high speed steel and a maraging steel has been reinforced with alumina, titanium and vanadium carbides. The composite was realized by powder metallurgy.The particles were mechanically mixed with the prealloyed powder before compaction. To optimize the composite properties, the processing parameters (i.e. prealloyed powders, size, mixing conditions, temperature of sintering, e..) and the effect of reinforcement (size and composition of particles, volume, fraction, ..) were studied. It is necessary to obtain a full density with the minimum porosities and to control boht the size, the distribution and the dispersion of the reinforced particles. The optimal sintering temperature depends on the reinforcement particles used and is of great importance for the properties. Processing parameters (mixing of particules) can greatly affect the final properties. It has been showed that the use of M203 increases the wear resistance in the two matrix. [less ▲]

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See detailRole of impurities in reclaimed WC-TaC-TiC-Co powders used in cutting tools.
Magnée, Adrien ULg; Lecomte-Beckers, Jacqueline ULg

in Proceedings of the International Conference on Advances in Hard Materials Production (1992)

The purpose of the present work was to examine the effect of recycling and the effect of intentional impurities (CaS, Al2O3, Zn, SiO2) on some properties (transverse rupture strength, hardness and cutting ... [more ▼]

The purpose of the present work was to examine the effect of recycling and the effect of intentional impurities (CaS, Al2O3, Zn, SiO2) on some properties (transverse rupture strength, hardness and cutting tests) of WC-TaC-TiC-Co. In all cases the batches of powders were processed under identical conditions with sintering carried out in laboratory. Damage study of the sintered carbides plates during cutting tests have been interpretated following the Taylor's law, relating the tool lifes as a function of cutting speed. [less ▲]

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