GERMAIN Guénaël
Directeur du LAMPA
Professeur des Universités
DIPPE - Durabilité, Ingénierie des Procédés et Physique des Ecoulements
Profil d'enseignement
Procédés de fabrication (L3-M2)
Industrialisation, gamme de fabrication (M1)
Conception Mécanique (L2)
Profil de recherche
Etude de l'usinage avec une approche expérimentale et numérique, aux échelles macro et micro.
Les travaux portent particulièrement sur les assistances à l'usinage (laser, haute pression, cryogénique), et l'usinabilité de nouveaux matériaux, avec des études sur l'effet des configurations d'usinage sur l'intégrité de surface des pièces et sur les différents critères d'usabilités (usure, effort, formation du copeau...).
Synthèse du parcours professionnel
Depuis 2024 : Directeur du LAMPA, EA1427
Depuis 2018 : Professeur des Universités, CNU60, LAMPA
2013 : Obtention de l'HDR
2008 : Maître de conférences, CNU60, LAMPA
1996 : Obtention de l'agrégation de Génie Mécanique
New standards are being introduced to eliminate toxic elements in materials. For instance, copper alloys should no longer contain lead, although this makes them more challenging to machine. Additionally, for environmental reasons, it is crucial to eliminate cutting oils. To address these two challen…
2025;133:567-572.
DOI : 10.1016/j.procir.2025.02.097
High deformation manufacturing processes, such as forming and machining, are complex physical phenomena involving severe thermomechanical and chemical loads. Traditional industrial-scale empirical methods involve high tooling and preparation costs and long lead times before manufacturing, which is u…
2025;133:460-465.
DOI : 10.1016/j.procir.2025.02.079
Bulk metallic glasses (BMGs), unlike crystalline alloys, exhibit significantly enhanced plastic deformation when tested at cryogenic temperatures. This enhanced plasticity is primarily characterized by the slowed propagation of shear bands and the formation of multiple shear bands, which play a cruc…
2025;54:1685-1693.
DOI : 10.21741/9781644903599-181
2025;54:1817-1825.
DOI : 10.21741/9781644903599-195
The need to reduce fuel consumption and emissions is driving advances in aeroengine performance. Efficiency gains are limited by the capacity of the turbine material to withstand the high thermomechanical loads of the combustion process. Nickel-based alloy Udimet 720Li has emerged as a promising alt…
Materials & Design. 2025;252(113700)
DOI : 10.1016/j.matdes.2025.113700
During machining, the friction between the tool and the workpiece (cutting face and flank face) is a significant tribological phenomenon because it strongly influences the cutting operation. Indeed, higher friction leads to an increase of cutting forces, a greater heat generation, a premature tool w…
2024;41:1990-1999.
DOI : 10.21741/9781644903131-220
The estimation of post-machining distortion of monolithic aeronautical parts induced by the redistribution of the bulk residual stresses (RS) during machining is one of the major challenges of aeronautical parts manufacturing. Since it is the main cause of thick parts post-machining distortion, it i…
2024;41:2021-2030.
DOI : 10.21741/9781644903131-223
Friction phenomena at the chip/tool/workpiece interfaces during machining of material impacts significantly the cutting process. In this article, the effect of friction conditions (dry, emulsion, cryogenic) on the tribological performance of uncoated tungsten carbide tools is investigated when machi…
Tribology International. 2024;195:109588.
DOI : 10.1016/j.triboint.2024.109588
Titanium alloys, largely used for aeronautical applications, are difficult to machine. High cutting forces, chip serration and important tool wear reflect this poor machinability, limiting productivity. One way of improving the machinability of titanium alloys consists of controlling their microstru…
Journal of Materials Processing Technology. 2023;319:118054.
DOI : 10.1016/j.jmatprotec.2023.118054
This article discusses the effect of machining assistance on the machinability and surface integrity of titanium and nickel-based alloys for turning operations. The presented results are based on a literature review of the principal experimental work published by the French research laboratories wit…
International Journal of Advanced Manufacturing Technology. 2023;131(2):647-661.
DOI : 10.1007/s00170-023-11440-y
Nowadays, numerical models are one of the most widely used techniques to predict material performance subjected to different manufacturing processes. However, to obtain accurate predictions, these models require reliable input data from thermomechanical tests. Nevertheless, during the test performan…
International Journal of Heat and Mass Transfer. 2023;204
DOI : 10.1016/j.ijheatmasstransfer.2022.123747
The use of aluminum-lithium alloys in aeronautics is an efficient solution for lightweight structures, but its machinability can cause increased tool wear. The cutting temperature is one of the most important parameters controlling the tool wear and the quality of machined surfaces. Therefore, its m…
Machining Science and Technology. 2023;27(5):556-576.
DOI : 10.1080/10910344.2023.2255238
When long parts are machined in forged blanks, the variability of bulk residual stress (RS) fields leads to uncontrolled deformation after machining, requiring manual reshaping. An original hybrid digital twin of forged part is thus proposed to manage the bulk RS variability and reduce part distorti…
CIRP Annals - Manufacturing Technology. 2023;72(1):77-80.
DOI : 10.1016/j.cirp.2023.04.021
In the context of diversification toward renewable energies, wind and tidal turbines are set to play an important role. To this end, the simulation code DOROTHY uses the Vortex Particle Method, which offers a good compromise between physical realism and computational times. A possibility has recentl…
2022;:113-122.
DOI : 10.1201/9781003360773-14
Aluminum alloys are widely used for structural parts in the aerospace industry. Those parts are usually machined from rolled plates or forged blanks, and heat treatments are carried out to reach the necessary mechanical properties. Forming and heat treatments induce residual stresses that generate d…
Procedia CIRP. 2022;108:687-692.
DOI : 10.1016/j.procir.2022.04.079
This paper reports on the state of the art in the experimental and numerical investigations of cutting and machining processes. The contributions on the above-mentioned processes and published on the Proceedings of the European Scientific Association for material FORMing (ESAFORM) Conferences are hi…
International Journal of Material Forming. 2022;15(3)
DOI : 10.1007/s12289-022-01680-w
A crystal plasticity-based constitutive model is proposed to describe the thermo-mechanical behavior of the Ti17 titanium alloy subjected to extreme loading conditions. The model explicitly incorporates the effect of the crystallographic orientation of the hcp and bcc phases. The constitutive equati…
Mechanics of Materials. 2022;166:104198.
DOI : 10.1016/j.mechmat.2021.104198
The present study investigates the effect of the high-speed milling (HSM), grinding and anodizing processes on the high cycle fatigue strength of the AA7050 aluminum alloy. These processes are systematically applied to certain aircraft components as specified by aeronautical standards, to attain a g…
International Journal of Advanced Manufacturing Technology. 2022;122(9-10):3903–3922.
DOI : 10.1007/s00170-022-10124-3
Finite Element Modelling used to predict machining outcomes needs to be supplied with the appropriate material thermomechanical properties which are obtained by specific testing devices and methodologies. However, these tests are usually not representative of the extreme conditions achieved in machi…
International Journal of Mechanical Sciences. 2021;198:106397.
DOI : 10.1016/j.ijmecsci.2021.106397
Despite the prevalence of machining, tools and cutting conditions are often chosen based on empirical databases, which are hard to be made, and they are only valid in the range of conditions tested to develop it. Predictive numerical models have thus emerged as a promising approach. To function corr…
Metals. 2021;11(8):1154.
DOI : 10.3390/met11081154
The finite element modeling is significantly dependent on the accurate prediction of the material behavior. In order to increase the accuracy of numerical simulations, a new phenomenological model is proposed in this study. Its mathematical formulation allows suitable predictions of the Ti6Al4V sens…
International Journal of Advanced Manufacturing Technology. 2021;116(11-12):3933-3951.
DOI : 10.1007/s00170-021-07753-5
The most important challenges when machining difficult-to-cut alloys used in critical applications consist mainly in increasing tool life as well as improving the component surface integrity. In particular, the nickel based alloys exhibit very low thermal conductivity inducing higher cutting tempera…
Journal of Materials Processing Technology. 2020;285:116780.
DOI : 10.1016/j.jmatprotec.2020.116780
Surface integrity directly affects the mechanical behavior of the workpiece, which is especially relevant on fatigue behavior. To characterize the quality of the machined surface, aspects such as material damage, roughness or residual stress are considered. Measurement of the material damage of the …
2020;87:372-377.
DOI : 10.1016/j.procir.2020.02.040
Surface integrity induced by machining process affects strongly the performance of functional products, for instance, the fatigue life as well as the resistance to stress corrosion cracking. Consequently, it is relevant to evaluate the induced properties on and beneath the machined surfaceto ensure …
2020;47:530-534.
DOI : 10.1016/j.promfg.2020.04.150
The numerical analysis, based on the finite element modeling (FEM), presents nowadays an efficient computational tool. It allows a better understanding of several thermo-mechanical phenomena involved during the machining process. However, its reliability heavily depends on the accurate definition of…
Machining Science and Technology. 2020;24(4):509-543.
DOI : 10.1080/10910344.2019.1698606
A 3D finite element modeling of the orthogonal turning process was curried out in the current study. It aims to carefully investigate the mechanisms controlling the chip segmentation and the crack propagation direction in the case of the Ti6Al4V machining. Coupled temperature-displacement numerical …
2020;671-680.
DOI : 10.1007/978-3-030-27146-6_73
In this work, a hyperelastic constitutive model is developed to describe the thermo-mechanical behavior of the Ti17 titanium alloy. The grain shape and the crystallographic orientation are explicitly taken into account. The behavior of both theαandβphases is modelled with a crystal plasticity formul…
2019;82:20-25.
DOI : 10.1016/j.procir.2019.04.336
Nickel-based superalloys are widely exploited in turbojets components which are subjected to intense thermal and mechanical loadings during their operation. In fact, they exhibit excellent mechanical properties over a wide range of temperature and high corrosion and creep resistance. However, these …
2019;2113
DOI : 10.1063/1.5112610
In this work, the impact of the microstructure and the loading conditions on the mechanical behavior of a β-rich Ti17 titanium alloy is investigated. For this purpose, two different initial microstructures are considered : (i) a two-phase lamellar α + β microstructure and (ii) a single-phase equiaxe…
Journal of Materials Science. 2019;:1765-1778.
DOI : 10.1007/s10853-019-04014-5
In this work, a fully automated adaptive remeshing strategy, based on a tetrahedral element for 3D metal forming processes, was proposed in order to solve problems associated with the severe mesh distortion that occurs during the computation. The main idea is to use the h-type adaptive mesh in combi…
International Journal of Material Forming. 2019;12(3):411–428.
DOI : 10.1007/s12289-018-1425-4
The aim of this study is to understand the impact of periodic surface micro-geometry patterns (obtained by High Speed Machining process) on the fatigue behavior of the AA7050 aluminium alloy and to define a proper defect acceptability criterion. It must be able to account for a large range of surfac…
International Journal of Fatigue. 2018;116:473-489.
DOI : 10.1016/j.ijfatigue.2018.06.048
One objective of this project is to propose a fatigue design approach that is able to account for a large range of machining surface defects and different component sizes and geometries. Due to the huge size difference between a typical fatigue specimen and large aircraft components it was first nec…
2018;165:14015.
DOI : 10.1051/matecconf/201816514015
For metallic materials, fabrication processes (e.g. machining and forging) may involve important strain rates and high temperatures. For such severe loading conditions, the development of damage is often associated with the formation of Adiabatic Shear Bands (ASB). In this work, the impact of loadin…
2018;1960(070004):0-0.
DOI : 10.1063/1.5034900
This work investigates the effect of artificial surface defects on the fatigue limit of a 7050 Aluminum alloy (AlZn6CuMgZr). A large fatigue testing campaign under fully reversed plane bending loading is undertaken on specimen with artificial surface hemispherical defects. The defect number was vari…
International Journal of Fatigue. 2018;110:81-94.
DOI : 10.1016/j.ijfatigue.2018.01.012
The main objective of this study is to investigate uncoated tungsten carbide tool wear mechanisms for high-pressure waterjet machining of the Ti555-3 titanium alloy. A comparative study has been undertaken (i.e. conventional versus assisted machining) based on numerous experimental tests. These test…
International Journal of Advanced Manufacturing Technology. 2018;96(1-4):845-856.
DOI : 10.1007/s00170-018-1661-2
The aim of this study is to identify the impact of High Speed Machining defects on the fatigue behaviour of the Al7050 aluminium alloy. A vast experimental campaign under fully reversed plane bending loads containing different surface states has been undertaken to characterize the effect of the surf…
2017;213:613-622.
DOI : 10.1016/j.proeng.2018.02.057
Cryogenic-assisted machining has already shown its advantages on the process and the machining parameters have been analysed. However, part of the coolant jet characteristics as the pressure and flow rate have not been completely studied and optimized. Hence, the main objective of this study is to i…
International Journal of Advanced Manufacturing Technology. 2017;93(1-4):1199-1206.
DOI : 10.1007/s00170-017-0604-7
Nickel based alloys are extensively used in the aerospace industry due to the excellent corrosion resistance and high mechanical properties that are maintained up to elevated temperatures (600–800 °C). However, these superalloys are classified as difficult-to-cut and therefore modelling and simulati…
Materials Science and Engineering: A. 2017;682:441-453.
DOI : 10.1016/j.msea.2016.11.054
The development of computation means has allowed the simulation of complex mechanical problems. The first simulations of manufacturing processes at the microstructure scale, namely in the field of machining, have recently emerged. In this study, and on the basis of previous research, a novel approac…
Finite Elements in Analysis and Design. 2017;137:43-55.
DOI : 10.1016/j.finel.2017.08.002
The chip formation mechanism of the Ti-6Al-4V remains a challenging problem in the machining process as well as its modeling and simulation. Starting from experimental observation on the titanium alloys Ti-6Al-4V machining shows that the ductile fracture in the chip formation is dominated by the she…
International Journal of Mechanical Sciences. 2017;134:p.189-202.
DOI : 10.1016/j.ijmecsci.2017.10.017
Titanium alloy is well known for its difficulty to machine, owing to the important “tool wear” phenomenon. Machining assistance is an interesting solution to lengthen the tool lifetime. In this study, we focused on the effect of cryogenic assistance—during machining of Ti17—on the tool wear and cutt…
International Journal of Advanced Manufacturing Technology. 2016;91(5-8):1493-1505.
DOI : 10.1007/s00170-016-9841-4
The behavior of Ti-6Al-4V has been studied via shear tests, using hat shaped specimen, on a servo-hydraulic Gleeble 3800 testing machine under the strain rate up to 10(3)s(-1) and temperature up to 900 degrees C. A new thermo-visco-plastic material law is proposed, based on a modified Johnson-Cook f…
2016;1769:art. 080015-6 p..
DOI : 10.1063/1.4963490
In this paper, a fully adaptive 3D numerical methodology based on a tetrahedral element was proposed in order to rove the finite element simulation of any metal forming process. This automatic methodology was implemented in a computational platform which integrates a finite element solver, 3D mesh g…
2016;6.
DOI : 10.1063/1.4963636
The aim of this study is to develop a new numerical cutting model that includes fluid structure interaction and to take into account heat transfer between the water-jet, the workpiece and the chip. This has been achieved using a CEL (Coupled–Eulerian–Lagrangian) technique, an algorithm has been deve…
Finite Elements in Analysis and Design. 2016;108:1-8.
DOI : 10.1016/j.finel.2015.09.003
During the High Speed Machining (HSM) of aircraft components, geometrical defects, such as mismatches or chatters, can be created. To obtain a high surface quality, an expensive manual grinding operation is systematically done to remove these defects. The aim of this study is to identify the impact …
2016..
In this paper, a deep study of constitutive parameters definition effect is done in order to guarantee sufficient reliability of the finite element machining modeling. The case of a particular biphasic titanium alloy Ti6Al4V known by its low machinability is investigated. The Johnson-Cook (JC) elast…
International Journal of Advanced Manufacturing Technology. 2016;1-21.
DOI : 10.1007/s00170-016-8934-4
Lors du fraisage UGV de pièces aéronautiques, certains défauts géométriques, tels que les ressauts et les marques de vibration, peuvent être générés. Pour obtenir une surface de bonne qualité, une opération de rectification (manuelle et coûteuse) est souvent conduite pour faire disparaître ces défau…
2016..
Understanding the physics of chip formation in machining operations is often difficult due to the complexity of the phenomena involved, such as the extreme and complex loading conditions that occur in the cutting zone. In order to model the machining process, it is necessary to use a constitutive be…
International Journal of Advanced Manufacturing Technology. 2016;1-11.
DOI : 10.1007/s00170-016-9476-5
This study focuses on the optimization of the machining assisted by cryogenic cooling. The main objective is to analyze the effect of the pressure and the flow of liquid nitrogen on tool life when machining titanium alloy Ti-6Al-4V using the cryogenic assisted machining. A nozzle holder has been spe…
HSM - High Speed Machining. 2016;2016:1-3.
Understanding of local mechanisms chip forming during machining by removal of material is difficult, to this end; a cutting finite element modelling is required. This study aims initially to model orthogonal cutting of Ti17 titanium alloy in dry and cryogenic machining and in a second time to study …
2015;Part II:95-102.
DOI : 10.1007/978-3-319-17527-0_10
This paper presents experimental results concerning the machinability of the titanium alloy Ti17 with and without high-pressure water jet assistance (HPWJA) using uncoated WC/Co tools. For this purpose, the influence of the cutting speed and the water jet pressure on the evolution of tool wear and c…
Precision Engineering. 2015;42:294-301.
DOI : 10.1016/j.precisioneng.2015.06.004
The origin of this article is the quantification of productivity gains and the improvement in surface integrity seen for a recent titanium alloy that is seeing increasing use in the aeronautical industry. The Ti555–3 titanium alloy, which is starting to find greater application in the aeronautical f…
Machining Science and Technology. 2015;19(1):134-151.
DOI : 10.1080/10910344.2014.991029
Laser-assisted machining combines several experimental parameters such as cutting speed, feed rate, depth of cut, laser power and distance between tool rake face and the laser beam axis. The optimization of these parameters is necessary to ensure the efficiency of assistance and to increase producti…
Finite Elements in Analysis and Design. 2014;92:72-79.
DOI : 10.1016/j.finel.2014.08.006
The present paper details a simple and effective experimental procedure dedicated to strain measurement during orthogonal cutting operations. It relies on the use of high frame-rate camera and optical microscopy. A numerical post-procedure is also proposed in order to allow particle tracking from Di…
Experimental Mechanics. 2014;54(6):1031-1042.
DOI : 10.1007/s11340-014-9868-0
Sequential sheet metal forming processes can result in the accumulation of work hardening and damage effects in the workpiece material. The mechanical strength of the final component depends on the “evolution” of these two characteristics in the different production steps. The punching process, whic…
Materials & Design. 2014;56:657-670.
DOI : 10.1016/j.matdes.2013.11.016
In this article, the development of an industrial prototype for manufacturing aeronautical fuselage panels is investigated. Deep drawing of large components such as aircraft fuselage panels is not an easy task in terms of dimensional accuracy, reliable material behaviour laws and failure criteria. H…
International Journal of Computer Integrated Manufacturing. 2014;27(2):129-138.
DOI : 10.1080/0951192X.2013.800641
Blanking of sheet metal is an important forming process in the automotive industry for the manufacture of mechanical components. The final component shape, obtained at the end of bending or deep-drawing processes, often has sharp edges due to the blanking operation. Concerning passenger safety compo…
International Journal of Advanced Manufacturing Technology. 2014;71(5-8):1019-1032.
DOI : 10.1007/s00170-013-5522-8
A review of the different phenomenological thermo-viscoplastic constitutive models often applied to forging and machining processes is presented. Several of the most common models have been identified using a large experimental database (Hor et al. (2013)). The latter consists of the tests were done…
Mechanics of Materials. 2013;vol. 64:pp. 91-110.
DOI : 10.1016/j.mechmat.2013.05.002
The use of HSLA steels for the manufacture of automotive components is interesting from an engineering point of view. This family of steels, while possessing high strength, also has good formability and can be used in forming manufacturing processes. In some forming processes such as blanking, shear…
Materials & Design. 2013;50:207-222.
DOI : 10.1016/j.matdes.2013.02.075
A review of the different phenomenological thermo-viscoplastic constitutive models often applied to forging and machining processes is presented. Several of the most common models have been identified using a large experimental database (Hor et al., 2013). The latter consists of the tests were done …
Mechanics of Materials. 2013;64:91-110.
DOI : 10.1016/j.mechmat.2013.05.002
Determining a material constitutive law which is representative of the extreme conditions found in the cutting zone during machining operations is a very challenging problem. In this study, dynamic shear tests, which reproduce, as faithfully as possible, these conditions in terms of strain, strain r…
2013;1-6.
Dans le cadre de cette étude nous nous sommes intéressés à l’assemblage de composites à matrice métallique par friction rotative. Le matériau qui fait l’objet de l’étude est un CMM à matrice acier avec 25% en volume de renforts en TiC. Pour éviter de détériorer le matériau lors de son assemblage nou…
2013..
This article presents the results of an experimental study on the Ti17 titanium alloy, which was carried out to analyze tool wear and the degradation mechanisms of an uncoated tungsten carbide tool insert. Two machining conditions, roughing and finishing, have been studied under different lubricatio…
Wear. 2013;305(1-2):228-237.
DOI : 10.1016/j.wear.2013.06.018
The success of a FE model for metal cutting process is strongly dependent on the accurate characterization of the workpiece material, under similar conditions as those found in metal cutting. In this paper, dynamic shear tests using a Gleeble machine have been performed on 4 mm thickness disks of AZ…
2013;8:521-526.
DOI : 10.1016/j.procir.2013.06.144
The corrosion resistance of magnesium alloys depends mainly on its surface integrity. Previous experimental studies have shown that machining can induces small (nano-scale) grain size, compressive residual stresses and basal plane crystallographic texture, which significantly improve the corrosion r…
2013;1-6.
Titanium alloys are known for their excellent mechanical properties, especially at high temperature. But this specificity of titanium alloys can cause high cutting forces as well as a significant release of heat that may entail a rapid wear of the cutting tool. To cope with these problems, research …
Key Engineering Materials. 2013;554-557:1961-1966.
DOI : 10.4028/www.scientific.net/KEM.554-557.1961
A new extension of the Gurson damage model has been proposed recently to predict ductile fracture under shear dominated loads. The aim of this work is to verify the ability of this approach to simulate, in an accurate way, the damage evolution in shearing processes. An implicit stress integration al…
Computational Materials Science. 2013;72:62-67.
DOI : 10.1016/j.commatsci.2013.01.035
Cet article propose de détailler une méthode utilisant les processus stochastiques pour modéliser le phénomène d'usure de composants mécaniques et en particulier l'usure par enlèvement de matière dans les contacts roulants acier sur acier. Cette estimation est réalisée en considérant une dérive d'us…
2013..
During forging and machining manufacturing processes, the material is subject to large strains at high strain rates which provoke local heating and microstructural changes. Modelling of these phenomena requires precise knowledge of the stress-strain constitutive equations for a large range of strain…
International Journal of Mechanical Sciences. 2013;vol. 67:pp. 108-122.
DOI : 10.1016/j.ijmecsci.2013.01.003
During forging and machining manufacturing processes, the material is subject to large strains at high strain rates which provoke local heating and microstructural changes. Modelling of these phenomena requires precise knowledge of the stress-strain constitutive equations for a large range of strain…
International Journal of Mechanical Sciences. 2013;67:108-122.
DOI : 10.1016/j.ijmecsci.2013.01.003
The Ti533-3 alloy is a new titanium alloy which is starting to see increased use in the aeronautical domain to improve the durability of components and to optimize the weight/resistance ratio. This alloy is characterized by greater resistance compared to the more commonly used titanium alloys such a…
International Journal of Advanced Manufacturing Technology. 2013;68(9-12):2471-2481.
DOI : 10.1007/s00170-013-4855-7
Determining a material constitutive law that is representative of the extreme conditions found in the cutting zone during machining operations is a very challenging problem. In this study, dynamic shear tests, which reproduce, as faithfully as possible, these conditions in terms of strain, strain ra…
Journal of Engineering Materials and Technology. 2013;135(3):031002-0310013.
DOI : 10.1115/1.4023674
The optimization of automotive security components requires good knowledge of the material state after fabrication, particularly with respect to damage that may have been done to the material by the manufacturing process. To achieve this, numerical simulation of the fabrication process is often unde…
2012;691-696.
DOI : 10.4028/www.scientific.net/KEM.504-506.691
Laser Assisted Machining (LAM) improves the machinability of materials by locally heating the workpiece just prior to cutting. Experimental investigations have confirmed that the cutting force can be decreased, by as much as 40%, for various materials. In order to understand the effect of the laser …
International Journal of Machine Tools and Manufacture. 2011;51(3):230-238.
DOI : 10.1016/j.ijmachtools.2010.11.006
This work deals a contribution to ductile damage of High-Strength Low-Alloy (HSLA) steel steels under low stress triaxiality. This work is based on micrographics observations and in situ shear tests to examine the evolution of microstructure in this kind of loading and to identify the damage process…
Key Engineering Materials. 2011;473:460-467.
DOI : 10.4028/www.scientific.net/KEM.473.460
Fatigue phenomena, which appear generally below the yield stress, is the cause of more than 80 % of in-service mechanical failures. However, the optimization of the weight and cost when designing mechanical components or structures, linked to improved performance, leads to increasingly stressed comp…
International Journal on Interactive Design and Manufacturing. 2010;4(4):281-287.
DOI : 10.1007/s12008-010-0110-8
Oyster farming structures are artificial obstacles which disturb tidal flow and wave propagation. These effects can induce modifications of erosion and sedimentation patterns, turbidity changes, local silting up and can be threatening for the shellfish farming itself. The understanding of the impact…
European Journal of Mechanics - B/Fluids. 2010;29:32-42.
DOI : 10.1016/j.euromechflu.2009.09.002
Time-frequency representations (TFRs) of signals are increasingly being used in biomedical research. Analysis of such representations is sometimes difficult, however, and is often reduced to the extraction of ridges, or local energy maxima. In this paper, we describe a new ridge extraction method ba…
IEEE Transactions on Biomedical Engineering. 2008;55(5):1496-1503.
DOI : 10.1109/TBME.2008.918556
Laser assisted machining (LAM) can improve the machinability of materials by locally heating the material prior to its removal. The work presented here is a study of the laser assisted machining of Inconel 718 (NiCr19FeNb at 46 HRc) with carbide and ceramic insert. The tests have shown a reduction i…
International Journal of Material Forming. 2008;1(1):p. 523-526.
DOI : 10.1007/s12289-008-0213-y
Computer Methods in Biomechanics and Biomedical Engineering. 2008;11(sup001):213-215.
DOI : 10.1080/10255840802298976
L'Usinage Assisté Laser (UAL) est un procédé d'usinage qui consiste à chauffer la pièce à l'aide d'un faisceau laser en amont de l'outil de coupe. La pièce ainsi chauffée voit ses caractéristiques mécaniques chuter, ce qui augmente son usinabilité. Les travaux réalisés ont porté sur l'influence de l…
2006..
The use of Laser Assisted Machining (LAM) can improve different aspects of the machinability of high strength materials. A study was undertaken to determine the optimum cutting parameters and to quantify their influence on fatigue strength according to the type of microstructure created. Two differe…
2006;524-525:569-574.
DOI : 10.4028/www.scientific.net/MSF.524-525.569
This study shows experimental and numerical preliminary approaches of laser assisted machining. The laboratory has an industrial lathe equipped with a laser source with 2.5 kW to carry out experiments on various materials. This machine is instrumented for the measurement of cutting forces and therma…
International Journal of Forming Processes. 2005;8:347-361.
Medical and Biological Engineering and Computing. 1996;34(2):115-121.
DOI : 10.1007/bf02520015