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Dynamic Mechanical Relaxation in Bulk Metallic Glasses:A Review

Journal of Materials Science & Technology 2014年第6期30卷 523-545页

作者： J.C.Qiao J.M.Pelletier Université de lyon CNRS France insa-lyon MATEIS UMR5510 F-69621 Villeurbanne France

Metallic glasses have aroused considerable interest in the past decades because they exhibit fascinating properties. First, this article briefly outlines the mechanical, thermal properties and application of the metallic glasses. In addition, we focus on the dynamic mechanical relaxation behaviors, i.e. main （α） and secondary （β） relaxations, in metallic glasses. The mechanical relaxation behaviors are connected to the mechanical properties and physical properties in glassy materials. The main relaxation in glassy materials is related to the glass transition phenomenon and viscous flow. On the other hand, the β relaxation is linked to many fundamental issues in metallic glasses. In these materials relaxation processes are directly related to the plastic deformation mechanism. The mechanical relaxations, particularly, the β relaxation provides an excellent opportunity to design metallic glasses with desired physical and mechanical properties. We demonstrate the universal characteristics of main relaxation in metallic glasses. The phenomenological models and the physical theories are introduced to describe the main relaxation in metallic glasses. In parallel, we show the dependence of the α. and β relaxations on the thermal treatments in metallic glasses. Finally, we analyze the correlation between the atomic mobility and the thermo-mechanical treatments in metallic glasses. On the one hand, the atomic mobility in metallic glasses is reduced by physical aging or crystallization. On the other hand, the atomic mobility in metallic glass is enhanced by deformation （i.e. compression and cold rolling）. Importantly, to analyze the atomic mobility in amorphous materials, a physical theory is introduced. This model invokes the concept of quasi-point defects, which correspond to the density fluctuations in the glassy materials.

关键词： Metallic glasses Mechanical properties Main relaxation Secondary relaxation Physical analysis

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On the relevance of analytical film thickness EHD equations for isothermal point contacts: Qualitative or quantitative predictions?

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Friction 2016年第4期4卷 369-379页

作者： Jean-David WHEELER Philippe VERGNE Nicolas FILLOT David PHILIPPON Univ lyon INSA Lyon CNRS LaMCoS-UMR5259 Villeurbanne F-69621 France

Thin film and elastohydrodynamic lubrication regimes are rather young domains of tribology and they are still facing unresolved *** they rely upon a full separation of the moving surfaces by a thin (or very thin) fluid film,the knowledge of its thickness is of paramount importance,as for instance to developing lubricated mechanisms with long lasting and efficient *** a consequence,a large collection of formulae for point contacts have been proposed in the last 40 ***,their accuracy and validity have rarely been *** purpose of this paper is to offer an evaluation of the most widespread analytical formulae and to define whether they can be used as qualitative or quantitative *** methodology is based on comparisons with a numerical model for two configurations,circular and elliptical,considering both central and minimum film thicknesses.

关键词： thin film lubrication elastohydrodynamic lubrication (EHL) film thickness prediction EHD analytical equation central film thickness minimum film thickness circular contacts elliptical contacts

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Site dependence of surface dislocation nucleation in ceramic nanoparticles

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npj Computational Materials 2021年第1期7卷 564-570页

作者： Jonathan Amodeo Emile Maras David Rodney Univ lyon CNRSINSA LyonUCBLMATEISUMR5510VilleurbanneFrance Universitéde lyon UniversitéClaude Bernard Lyon 1CNRSInstitut Lumière MatièreVilleurbanneFrance

The extremely elevated strength of nanoceramics under compression arises from the necessity to nucleate highly energetic dislocations from the surface,in samples that are too small to contain pre-existing ***,we investigate the site dependence of surface dislocation nucleation in MgO nanocubes using a combination of molecular dynamics simulations,nudgedelastic-band method calculations and rate theory *** an original simulation setup,we obtain a complete mapping of the potential dislocation nucleation sites on the surface of the nanoparticle and find that,already at intermediate temperature,not only nanoparticle corners are favorable nucleation sites,but also the edges and even regions on the side surfaces,while other locations are intrinsically *** are discussed in the context of recent in situ TEM experiments,sheding new lights on the deformation mechanisms happening during ceramic nanopowder compaction and sintering processes.

关键词： deformation dislocation ceramic

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A review of numerical analyses and experimental characterization methods for forming of textile reinforcements

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Chinese Journal of Aeronautics 2021年第8期34卷 143-163页

作者： Biao LIANG Philippe BOISSE School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China Universitede lyon CNRSINSA-LyonLaMCoSF69621France

The forming of textile reinforcements is an important stage in the manufacturing of textile composite parts with Liquid Composite Molding *** orientations and part geometry obtained from this stage have significant impact on the subsequent resin injection and final mechanical properties of composite *** simulation of textile reinforcement forming is in strong demand as it can greatly reduce the time and cost in the determination of the optimized processing parameters,which is the foundation of the low-cost application of composite *** review presents the state of the art of forming modeling methods for textile reinforcement and the corresponding experimental characterization methods developed in this *** microscopic,mesoscopic and macroscopic models are *** concerning the simulation of wrinkling are also presented since it is the most common defect occurred in the textile reinforcement ***,challenges and recommendations on the future research directions for textile reinforcement modeling and experimental characterization are provided.

关键词： Experimental characterization Forming Liquid Composite Molding Numerical analysis Textile reinforcements

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Numerical Analysis of the Tip Leakage Flow Field in a Transonic Axial Compressor with Circumferential Casing Treatment

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Journal of Thermal Science 2010年第3期19卷 198-205页

作者： G.Legras N.Gourdain I.Trebinjac LMFA-UMR CNRS 5509 Ecole Centrale de Lyon /Université Lyon 1 /INSA69134EcullyFrance CERFACS Computational Fluid Dynamics Team31057ToulouseFrance

This paper reports on numerical investigations aimed at understanding the influence of circumferential casing grooves on the tip leakage flow and its resulting vortical *** results and conclusions are based on steady state 3D numerical simulations of the well-known transonic axial compressor NASA Rotor 37 near stall operating *** calculations carried out on the casing treatment configuration reveal an important modification of the vortex topology at the rotor tip *** grooves limit the expansion of the tip leakage vortex in the direction perpendicular to the blade chord,but generate a set of secondary tip leakage vortices due to the interaction with the leakage mass ***,a deeper investigation of the tip leakage flow is proposed.

关键词： transonic axial compressor casing treatment circumferential groove tip leakage vortex

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Preparation of novel methyl methacrylate/fluorinated silsesquioxane copolymer film with low surface energy

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Science China Chemistry 2010年第9期53卷 2000-2005页

作者： GALY Jocelyne GéRARD Jean-Franois Université de lyon INSA LyonUMR CNRS 5223Ingénierie des Matériaux Polymères

Random copolymers of methyl methacrylate and fluorinated polyhedral oligomeric silsesquioxane(F-POSS) were synthesized and the corresponding thin films were prepared from solvent *** microstructure was confirmed by 1H NMR,elemental analysis and *** occurs in the bulk of the film during solvent evaporation which can be evidenced by Transmission Electron Microscopy,TEM,with POSS-rich nanophase sizes from 20 to 50 *** is attributed to the self-assembly of F-POSS due to the cluster-cluster interactions resulting from the nature of their ligands,i.e.,cycloaliphatic ligands and perfluorinated *** analysis was used to investigate the thermal degradation *** was shown that when F-POSS content is higher than 2.8 mol%,the incorporation of F-POSS could improve the thermal stability of PMMA *** addition,it was shown that these fluorinated POSS-based copolymer surfaces could reduce the surface energy and could be used to design water-repellant nanocomposite coatings.

关键词： POSS PMMA nanostructure thermal stability surface properties

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ZnO nanoparticles as a luminescent down-shifting layer for photosensitive devices

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Journal of Semiconductors 2013年第5期34卷 29-34页

作者：朱瑶 A.Apostoluk 刘诗斌 S.Daniele B.Masenelli School of Electronics and Information Northwestern Polytechnical University Universite de lyon F-69000 LyonFrance and INLCNRSUMR 5270INSA LyonF-69621 VilleurbanneFrance Universite de lyon F-69000 LyonFrance and IRCE LyonCNRSUMR 5256F-69626 VilleurbanneFrance

The optical properties ofZnO nanoparticles （NPs） fabricated by three different methods were studied by the UV-excited continuous wave photoluminescence in order to estimate their down-shifting （DS） efficiency. Such a luminescent layer modifies the incident solar radiation via emitting wavelengths better matching the spectral response of the underlying photosensitive device （photodiode）, thereby increasing its efficiency. Some of the studied ZnO NPs were subsequently deposited on the front side of commercial silicon photodiodes and the external quantum efficiency （EQE） characteristics of the final devices were measured. Through comparison of the photodiode＇s EQE characteristics before and after the deposition of the ZnO NPs layer, it was concluded that for the photodiode with a low UV sensitivity （about 8%）, the ZnO luminescent layer produces a down-shifting effect and the EQE in the UV and blue range improves by 16.6%, while for the photodiodes with a higher initial UV sensitivity （about 50%）, the EQE in this range decreases with the ZnO layer thickness, due to the effects competing with DS, like the diminution of the ZnO layer transmittance and an increasing diffusion.

关键词： ZnO nanoparticles photoluminescence down-shifting external quantum efficiency

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Mitochondria-associated endoplasmic reticulum membranes allow adaptation of mitochondrial metabolism to glucose availability in the liver

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Journal of Molecular Cell Biology 2016年第2期8卷 129-143页

作者： Pierre Theurey Emily Tubbs Guillaume Vial Julien Jacquemetton Nadia Bendridi Marie-Agnes Chauvin Muhammad Rizwan Alam Muriel Le Romancer Hubert Vidal Jennifer Rieusset INSERM UMR-1060 CarMeN LaboratoryLyon 1 UniversityINRA U1235INSA of LyonRockefeller and Charles Merieux Lyon-Sud medical UniversitiesF-69003 LyonFrance Cancer Research Center of lyon Centre Leon BerardUMR INSERM 1052CNRS 5286F-69373 LyonFrance Hospices Civils de lyon Lyon-Sud HospitalEndocrinologyDiabetology and Nutrition ServiceF-69310 Pierre BeniteFrance

Mitochondria-associated endoplasmic reticulum membranes(MAM)play a key role in mitochondrial dynamics and function and in hepatic insulin *** mitochondria are important regulators of energy metabolism,the nutritional regulation of MAM in the liver and its role in the adaptation of mitochondria physiology to nutrient availability are *** this study,we found that the fasted to postprandial transition reduced the number of endoplasmic reticulum-mitochondria contact points in mouse *** of potential hormonal/metabolic signals revealed glucose as the main nutritional regulator of hepatic MAM integrity both in vitro and in *** reduced organelle interactions through the pentose phosphate-protein phosphatase 2A(PP-PP2A)pathway,induced mitochondria fission,and impaired *** MAM reduction counteracted glucose-induced mitochondrial ***,disruption of MAM integrity mimicked effects of glucose on mitochondria dynamics and *** glucose-sensing system is deficient in the liver of insulin-resistant ob/ob and cyclophilin D-KO mice,both characterized by chronic disruption of MAM integrity,mitochondrial fission,and altered mitochondrial *** data indicate that MAM contribute to the hepatic glucose-sensing system,allowing regulation of mitochondria dynamics and function during nutritional *** disruption of MAM may participate in hepatic mitochondrial dysfunction associated with insulin resistance.

关键词： MAM mitochondria dynamics hepatocytes glucose sensing pentose phosphate pathway PP2A

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Effect of an Internal Heat Exchanger on the Performances of a Double Evaporator Ejector Refrigeration Cycle

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Fluid Dynamics & Materials Processing 2023年第5期19卷 1115-1128页

作者： Rachedi Khadraoui Latra Boumaraf Philippe Haberschill Mechanical Engineering Department Badji Mokhtar UniversityAnnabaAlgeria Center for Thermal Sciences of lyon INSAVilleurbanneFrance

A theoretical investigation is presented about a double evaporator ejector refrigeration cycle(DEERC).Special attention is paid to take into account the influence of the sub-cooling and superheating effects induced by an internal heat exchanger(IHX).The ejector is introduced into the baseline cycle in order to mitigate the throttling process losses and increase the compressor suction ***,the IHX has the structure of a concentric counter-flow type heat exchanger and is intentionally used to ensure that the fluid at the compressor inlet is *** assess accurately the influence of the IHX on the DEERC performance,a mathematical model is derived in the frame of the dominant one-dimensional theory for *** model also accounts for the friction effect in the ejector mixing *** equations of this model are solved using an Engineering Equation Solver(EES)for different *** are:R134a as baseline fluid and other environment friendly refrigerants used for comparison,namely,R1234yf,R1234ze,R600,R600a,R290,R717 and *** simulation results show that the DEERC with an IHX can achieve COP(the coefficient of performance)improvements from 5.2 until 10%.

关键词： Refrigeration cycle double evaporator ejector IHX performance improvement environment-friendlyrefrigerants

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Numerical Investigation of Flutter Stability in Subsonic Space Turbine Blisk with Emphasis on Cut-on/Cut-off Modes and Interblade Phase Angles

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Journal of Thermal Science 2012年第6期21卷 492-499页

作者： Hakim Ferria Pascal Ferrand Franois Pacull Stéphane Aubert Laboratoire de Mécanique des Fluides et d'Acoustique CNRS UMR 5509 Université de LyonUniversité Claude Bernard Lyon 1INSA Lyon 36avenue Guy de Collongue69134 EcullyFrance Fluorem 64 chemin des Mouilles69134 EcullyFrance

The so-called blisks,*** bladed disks,are characterized by very low viscous material damping and make the flutter prediction much more *** that framework,a two-dimensional numerical study of a space turbine blisk featuring complex deformation of blades and high eigenfrequency(>40kHz)is *** simulations are based on unsteady Reynolds Averaged Navier Stokes computations linearized in the frequency domain and consist in the superposition of an unsteady linear(in time)pressure field,generated by a harmonic perturbation,upon a steady nonlinear(in space)*** aerodynamic damping coefficient is calculated over a range of nodal diameters,and the blades are predicted aeroelastically ***,violent changes occur and are rather critical since sudden and large deviations in stability *** that context,the nature of the waves propagating from the cascade are *** an approach provides fundamental knowledge about the perturbations which can either propagate to the far-field(cut-on mode)or decay(cut-off mode).It is expected that the ability of the flow to damp or to amplify the blade motion is strongly affected by the way unsteady perturbations are transferred from the cascade to the *** nature of the waves are first assessed from the aforementioned linearized results,then they are evaluated analytically and finally compared.A good agreement is found despite the strong assumptions of the analytical *** results show a clear correlation between the cut-on/cut-off conditions and *** least stable configuration corresponds to cut-off mode at the inlet and no wave at the *** outgoing waves from the cascade,the blade is prone to be less stable:the energy from the blades vibration is necessarily dissipated or sent out by the cascade.

关键词： subsonic flutter LRANS blisk cut-on/cut-off mode interblade phase angle nodal diameter.

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