I. Demirci

École nationale supérieure d'arts et métiers

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S. Mezghani

HESAM Université

M. Yousfi

Laboratoire Plasma et Conversion d'Energie

M. El Mansori

Laboratoire de Mécanique et Procédés de Fabrication

Pascal Aubry

CEA Paris-Saclay

Hicham Maskrot

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Christine Blanc

Centre National de la Recherche Scientifique

Morgan Dal

Laboratoire Procédés et Ingénierie en Mécanique et Matériaux

H. Zahouani

Laboratoire de Tribologie et Dynamique des Systèmes

C. Gauthier

Institut Charles Sadron

Ali Mkaddem

Jeddah University

Cooperative Institutions

Centre National de la Recherche Scientifique

École nationale supérieure d'arts et métiers

ParisTech

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Université Paris-Saclay

CEA Paris-Saclay

Université Claude Bernard Lyon 1

Institut National des Sciences Appliquées de Lyon

Laboratoire de Mécanique et Procédés de Fabrication

École Normale Supérieure - PSL

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Papers

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Study of the elaboration of high entropy material from powder by laser additive manufacturing

Procedia CIRP (2020)

G. Hüser I. Demirci Pascal Aubry I. Guillot Loïc Perrière

If Stellite® 6 is a cobalt base alloy with a hard coating well known for its good wear resistance, its use is not desirable for nuclear installations due to the activation of cobalt under neutron flux which makes maintenances more delicate as, later, decommissioning. If several studies have led to propose certain hard coatings without cobalt, for the moment, none equals the wear properties of Stellite® 6. The present research aims to explore the recent research area on high entropy alloys or concentrated composition alloys (HEA/CCA) as a new path for the development of innovative hard coatings. The study is based on the use of thermodynamics simulations with CALPHAD in order to predict the compositions of a large number of alloys, after an initial selection of the acceptable elements (NiFeCrMoTi in this study). Then, Laser Metal Deposition (LMD) is used for manufacture walls of graded compositions for a rapid screening of compositions and coatings for later wear tests. The metallurgical analyses of the elaborated samples allow selecting the most promising ones on which wear pin-on-disk tests are finally conducted. The wear tests have evidenced promising behavior for the selected HEA/CCAs.

Stellite

High-Entropy Alloys

Hard metal

Structural material

10.1016/j.procir.2020.09.051

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Citations (6)

Influence de l'échelle de rugosité sur le frottement dnas les contacts lubrifiés

HAL (Le Centre pour la Communication Scientifique Directe) (2013)

I. Demirci S. Mezghani M. Yousfi H. Zahouani Mohammed Elmansori

Source

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Influence de l'échelle de rugosité sur le frottement dans les contacts lubrifiés

HAL (Le Centre pour la Communication Scientifique Directe) (2013)

I. Demirci Sabeur MEZGHANI M. Yousfi H. Zahouani M. El Mansori

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Effects of abrasive tools on surface finishing under brittle-ductile grinding regimes when manufacturing glass

Journal of Materials Processing Technology (2009)

I. Demirci S. Mezghani Ali Mkaddem M. El Mansori

Brittleness

Diamond grinding

Metallic bonding

10.1016/j.jmatprotec.2009.10.009

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Citations (28)

The Scale Effect of Roughness on Hydrodynamic Contact Friction

Tribology Transactions (2012)

I. Demirci S. Mezghani M. Yousfi H. Zahouani M. El Mansori

Multistage abrasive finishing processes (grinding, polishing, honing, etc.) are commonly used to produce the geometrical properties of a surface to meet its technical functionalities in the operating characteristics of contacting parts in friction, relating to their durability and reliability (running-in performance, wear resistance, load-carrying capacity, etc.). Coarse abrasive grits followed progressively finer ones are used, which leads to a multiscale stratified surface texture. In this article, a numerical model of elastohydrodynamic (EHD) contact coupled to a multiscale surface texture model was developed that allows tracking the scale effect of surface features and their interactions on friction performance and lubricant flow under hydrodynamic lubrication conditions. Because the simulation model has as an input the surface topography and to overcome the variability in surface finish formation, textured surfaces at different stages of the finishing process were simulated (virtual texturing method). Surface topography can be decomposed into two principal components: superficial roughness and valleys. Superficial roughness was modeled using a fractal model and a scaling factor was introduced to model valley patterns. The results show the relationship between friction and surface scales.

Texture (cosmology)

Abrasion (mechanical)

10.1080/10402004.2012.694990

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Citations (26)

RETRACTED: A pure thermal model to evaluate heat-affected zone when milling E-glass fiber-reinforced polyester composites

Journal of Composite Materials (2016)

Ali Mkaddem Muhammad Zain-ul-abdein I. Demirci Abdullah S. Bin Mahfouz

This paper aims at investigating the resistance-to-vitrification of glass fiber-reinforced plastics when milling. A three-dimensional thermal model using volumetric heat source with Gaussian distributed cylindrical flux was developed as DFLUX subroutine and implemented into Abaqus/Standard code. The wheel feed was simulated by the source motion at 250 mm min−1 with spindle speeds of 11,460, 15,280, and 19,100 rpm. Milling tests using abrasive wheel with 10 mm in diameter were conducted on the composite specimens of dimensions 100 × 25 × 4 mm3 with fibers oriented both parallel and perpendicular to the milling direction. Four equidistant thermocouples were embedded within the medium plane of the specimen in order to measure the temperature histories. Each series of tests was repeated four times under identical conditions. Predictions confronted to measurements demonstrated the validity of the proposed model. Cutting perpendicular to fibers was found favoring in-depth heat dissipation. However, the fibers a...

Thermocouple

Equidistant

10.1177/0021998316640059

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Citations (1)

The effect of groove texture patterns on piston-ring pack friction

Precision Engineering (2011)

S. Mezghani I. Demirci H. Zahouani M. El Mansori

Piston ring

Groove (engineering)

Honing

Piston (optics)

Texture (cosmology)

Fluid bearing

10.1016/j.precisioneng.2011.09.008

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Citations (135)

A multigrains׳ approach to model the micromechanical contact in glass finishing

Wear (2014)

I. Demirci Ali Mkaddem Driss El Khoukhi

Scratch

Groove (engineering)

Contact area

Lapping

Ranging

10.1016/j.wear.2014.10.002

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Citations (10)

Mutual influence of crosshatch angle and superficial roughness of honed surfaces on friction in ring-pack tribo-system

Tribology International (2013)

S. Mezghani I. Demirci M. Yousfi M. El Mansori

Honing

Texture (cosmology)

10.1016/j.triboint.2013.04.014

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Citations (43)

Analysis of the Damage of Uncoated Polymeric Surfaces During Scratching

World Tribology Congress III, Volume 2 (2005)

I. Demirci C. Gauthier Christophe Fond Robert Schirrer

Attempts have been made to correlate the scratch behaviour and basic material properties of polymers and a correlation has been established between the scratch damage and friction coefficient. However, no clear relationship has yet been established between the bulk response and scratch damage. The scratch behaviour of three solid polymers (PMMA, PC and CR39) was investigated to determine how the behaviour of the bulk material affects the scratch resistance. The bulk damage responses of these materials are well known: crazing, shearing and cracking, respectively. The surfaces were scratched under progressive scratch loading and an imaging system was used to record real time photographs of the in-situ contact area and scratch damage. PMMA exhibited crazing under the apex of the scratching tip while the shearing of PC started under the front part of the contact area and cracking appeared in CR39 at the rear edge of the contact. Numerical simulations confirmed these damage mechanisms.

Scratch

Crazing

Shearing (physics)

Scratching

Contact area

10.1115/wtc2005-63586

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Citations (1)