David Mercier

ANSYS · Office of the CTO - CR&D team

Data management, as well as multiscale and multiphysicsmodelling are key skills required by companies recruiting “Materials science” engineers today. In this context, it has beenproposed to completean already existing teaching program in numerical modellingin the frame of a master degreein Phelmaengineering school of Grenoble University, by adding...

Functional devices such as microelectronic systems, solar cells and power devices are composed of complex stacks of various materials, including semiconductors, ceramics and metallic alloys. The knowledge of the mechanical response of those stacks is a key point, as they are submitted to harsh stresses during the fabrication process (induced by the...

Data management is crucial in the scope of material science digitalization and collaborative research projects. In this context, a simple modular workflow is proposed to link material properties databases with analytical and numerical modelling tools. As a first step, Ansys Granta MI framework is used and designed to capture and manage a large amou...

Data management is crucial in the scope of material science digitalization and collaborative research projects. In this context, a simple modular workflow is proposed to link material properties databases with analytical and numerical modelling tools. As a first step, Ansys Granta MI framework is used and designed to capture and manage a large amou...

As additive manufacturing (AM) becomes widespread, more and more tools are needed to manage the large quantity of variables involved and the different data sets generated. From their inception to their conclusion, AM projects require a broad variety of tools to systematize and capitalize the knowledge stemming from these applications. In this conte...

In general, the mechanical properties of hard thin coatings are investigated using indentation methods. Material characteristics of hard coatings, such as elastic modulus and hardness, are evaluated by means of nanoindentation and an appropriate evaluation methodology. The most popular method used to obtain the coating properties required using nan...

In this study, the microstructure and the mechanical properties of hot dip Zn-Al and Zn-Al-Mg coatings were investigated by means of nanoindentation and Scanning Electron Microscopy (SEM) coupled with an Electron Probe X-ray Microanalysis Wavelength Dispersive (EPMA-WD) detector. Nanoindentation grid technique was used to draw two-dimensional mecha...

Œuvrer dans le domaine de la formation est un défi de projection et d’anticipation des enjeux futurs. Qu’il s’agisse des étudiants au primaire, secondaire ou dans l’enseignement supérieur, il est nécessaire de prévoir quelles compétences leur seront pertinentes à l’issue de leur parcours. L’avènement d’une pandémie, un fait inédit depuis quelques g...

• Predicting the overall mechanical properties of the composite is very important for material design and applications, especially in aerospace and automobile industry. Metal matrix composites (MMCs) have attractive mechanical and thermal properties. But, how to estimate properties of MMCs? When does it make sense to use them? • Rules of mixtures...

The aim of this paper is to identify performance indices for the design of coating systems, using results from nanomechanical tests. The use of nanoindentation, nanoscratch and pin-on-disk experiments applied to coatings for mechanical and tribological property estimation is presented. Then, multiple performance indices, based on experimental and n...

Local mechanical properties of sub‐micron features are of particular interest due to their influence on macroscopic material performance and behavior. This study is focused on local nanomechanical measurements, based on the latest Atomic Force Microscopy (AFM) mode, where the peak force set point is finely controlled at each pixel. After probe cali...

Identifier un bon revêtement ou un solution alternative pour la protection mécanique / chimique d'un substrat métallique par exemple est un défi, compte tenu du grand nombre de solutions techniques. Dans ce séminaire en ligne, nous présenterons comment trouver des données pour les revêtements dans Granta Selector 2020 et comment effectuer une compa...

The sol–gel coating method is considered to be simple and easy to implement to lead to organic/inorganic hybrid coatings. In addition, the application of thin films by this technique is inexpensive and applicable on large substrates without form restriction. In this context, thin sol–gel coatings based on a mixture of three alkoxysilanes and synthe...

The aim of this paper is to identify performance indices for the design of coating systems, using results from nanomechanical tests. The use of nanoindentation, nanoscratch and pin-on-disk experiments applied to coatings for mechanical and tribological property estimation is presented. Then, multiple performance indices, based on experimental an...

L'utilisation grandissante des procédés de fabrication additive requiert des outils pour aider les concepteurs dans le choix de couples matériau/technologie, mais aussi pour la gestion des données et connaissances générées par les chercheurs et industriels ayant recours à ces procédés. Le logiciel CES Selector permet aux concepteurs et experts maté...

Advanced mechanical engineering courses need to equip students not only with knowledge of materials, but also with the appropriate tools and approaches to solve modern materials challenges. Students can be engaged through design projects and case studies which help them to develop these skills and validate their results against industry practice....

Some Fe-Ni based alloys, such as Invar 36, present a low coefficient of thermal expansion (of the order of 1 ppm.°C-1 and below) from cryogenic to moderate temperatures [1-2]. Such dimensional stability makes Invar alloys well adapted for aerospace applications such as precision instruments on shuttles and satellites that are subjected to wide temp...

Some Fe-Ni based alloys, such as Invar 36, present a low coefficient of thermal expansion (of the order of 1 ppm.°C-1 and below) from cryogenic to moderate temperatures [1-2]. Such dimensional stability makes Invar alloys well adapted for aerospace applications such as precision instruments on shuttles and satellites that are subjected to wide temp...

This work is focused on the mechanical characterization by multiscale indentation (nano and macro) of a brake pad material, with multiple phases and complex microstructure for applications in the railway industry. Grid nanoindentation tests allowed to identify the mechanical properties of the components in the formulation. The significant differenc...

Matlab code to calculate tunnel electrical resistance.

The TriDiMap toolbox has been developed to plot, to map (2D or 3D = tomograph) and to analyze (nano)indentation dataset (PDF and CDF plots + fitting, E vs H plot and clustering analysis), obtained by (nano) indentation grid technique. Such toolbox is for the determination of the mechanical properties of each individual phase in the case of a multip...

The NIMS toolbox has been developed to plot and to analyze (nano)indentation data (obtained with conical indenters) for bulk material or multilayer sample.

This toolbox has been developed to plot (nano)indentation data and to analyze pop-in events distribution.

Because of a very high performance demands on cutting tools, using of surfaces with hard coatings is an excellent solution. The high hardness of the coatings can result in wear problems at high load forces. To be able react on such type of damage it is inevitable to find an appropriate method for diagnostic of wear behaviour. The goal is to find, o...

Presentation given for a training during Indentation 2018 conference, about fracture under indentation experiments (state of the art, on different materials, toughness estimation, exotic experiments...). A second file is provided with 4 basic exercises and corresponding answers, related to fracture during indentation.

Dear Colleagues, The indentation conference from the Groupe Indentation Multi-Echelle (GIME) gathers every two years, scientists and industrials concerned by the problems of mechanical characterization of surfaces. In 2018, this conference is organized by Belgian scientists: ULg, CRM Group, UCL et UMons. It will take place from 11 to 14 September...

Cast bimetallic work roll with a high-speed steel (HSS) shell material is commonly used in hot strip mills [1-5]. In the present work, samples of HSS shells which contain micrometric carbides were studied. The microstructure was examined using scanning electron microscope (SEM) and combined with energy dispersive spectroscopy (EDS) for phase differ...

Quenching and Partitioning (Q&P) has been proposed as a novel heat treatment to produce cold rolled sheets with excellent strength and sufficient formability for cold stamping. The impact of Q&P processing on microstructure and tensile properties has been extensively studied in contrast to the lower attention devoted to its effect on stretch-flange...

This Matlab toolbox has been developed to plot and to analyze scratch resistance and mechanical deformation of material from (nano)scratch results.

Presentation about the use of Gwyddion software for AFM image analysis.

Metal matrix composite coatings reinforced with hard ceramic particles are attracting growing interest due to their promising mechanical properties. In the present work, a thick nickel coating, containing micrometric Silicon Carbide (SiC) particles, was electro-deposited on a steel substrate from a suspension of SiC in a Watts-type Ni-plating bath....

Cr/CrN/(Cr,N)-DLC/DLC and Cr/Cr-DLC/DLC multilayer coatings have been synthesized using DC sputtering magnetron technique to protect steel substrates from wear. The microstructure was investigated by scanning electron microscopy and the chemical structure of the DLC layers was investigated by Raman spectroscopy. The mechanical and tribological prop...

Description of the atomic force microscopy technique available in the CRM Group.

Poster for the SMT31 Conference, about "Mechanical properties and decohesion of sol-gel coatings on metallic and glass substrates". 2nd best poster award.

Abstract Thin amorphous alumina layers (10 to 40nm thick) are processed on sputtered aluminum thin film (500nm) by atomic layer deposition (ALD) at low temperature (85° C). Global methodology combining quantitative experimental observations of fracture and numerical modeling is proposed to obtain the fracture strength of ALD thin film on Al layer....

Various Matlab functions in the field of mechanics of materials and contact mechanics

Nanoindentation technique and its application

Nanoindentation and EBSD on steel

Poster about the description of nanoindentation and nanoscratch techniques, used in the CRM Group. From the internship of G. Géradon (Gramme Institute).

Les revêtements composites à matrice métallique renforcés par des particules céramiques ont largement été étudiés, étant donné leurs propriétés mécaniques très prometteuses. Dans ce travail, un revêtement composite épais à matrice nickel a été électrodéposé sur un substrat acier à partir d’un bain de nickelage de Watt, contenant des particules de S...

.xls file with multilayer elastic models to analyze indentation of 2, 3 or more layers on a substrate.

”Pop-in” Analysis From Indentation Tests http://popin.readthedocs.org/en/latest/

Matlab functions to plot 3D maps from nanoindentation tests.

A Matlab toolbox to plot and to analyze nanoindentation data (with conical indenters) http://nims.readthedocs.org/en/latest/

Talk given at the EMMC15 conference.

The influence of grain boundaries on plastic deformation was studied by carrying out nanoindentation near grain boundaries (GBs). Surface topographies of indentations near grain boundaries were characterized using atomic force microscopy (AFM) and compared to corresponding single crystal indent topographies collected from indentations in grain inte...

The Matlab toolbox STABiX provides a unique and simple way to analyse slip transmission in a bicrystal. Graphical User Interfaces (GUIs) are implemented in order to import EBSD results, and to represent and quantify grain boundary slip resistance. Key parameters, such as the number of phases, crystal structure (fcc, bcc, or hcp), and slip families...

Study of Bi-Crystal Grain Boundary Deformation in Commercially Pure Tantalum.

Oral presentation given at Euromech conference in Houffalize (Belgium) in October 2015.

The Matlab toolbox STABiX provides a unique and simple way to analyse slip transmission in a bicrystal. Graphical User Interfaces (GUIs) are implemented in order to import EBSD results, and to represent and quantify grain boundary slip resistance. Key parameters, such as the number of phases, crystal structure (fcc, bcc, or hcp), and slip families...

Invited talk about the presentation of STABiX in MTEX workshop 2016.

Presentation about exercises with MTEX software (vs STABiX), in the MTEX Workshop 2016.

Poster presented at "Indentation 2014" Conference in Strasbourg (France) (December 2014). Spherical indentation and crystal plasticity modeling near grain boundaries in alpha‐Ti.

We present a study about the dependence of the evolution of orientation patterns around nanoindents on the presence of a grain boundary. In prior work, the plasticity of single crystalline Ti-5Al-2.5Sn (wt%) near α-alloy has been quantified by a combination of crystal lattice orientation mapping, instrumented sphero-conical nanoindentation, and mea...

Slip transmission across grain boundaries is an essential micromechanical processes during deformation of polycrystalline materials. Slip transmission processes can be characterized based on the geometrical arrangement of active slip systems in adjacent grains and the value of the critical resolved shear stress acting on the incoming and possible o...

Poster presented in CAMTEC III conference.

In the field of « 3D » microelectronic integration, a wafer level technology using flip chip stacking and based on a microinsertion process has been developed recently. This technology is mainly based on the contact realized by thermocompression between a network of microinserts made of Nickel ECD, with connections pads in Al(Cu). In this work, a s...

Analyzing spherical indentation of a bicrystal MATLAB GUI --> from EBSD to CPFEM

The Young's modulus of a titanium nitride thin film has been investigated in this study by means of nanoindentation technique. Nanoindentation measurements have been coupled to analytical models and finite elements simulation to decorrelate the effect of substrate from the Young's modulus evaluation. Whereas analytical models did not lead to a conv...

Poster presented at 58th IEEE Holm Conference On Electrical Contacts.

Oral presentation to the HOLM conference in 2012. Young Investigator Award.

In the field of electrical contact, to explain the evolution of electrical resistance as a function of the applied load, it is necessary to take into account the fracture of the native oxide of a metal. This work investigates the role played by the native alumina present at the surface of Al thin film in the formation of micro-contacts as a functio...

Poster presented at MAM2012 Conference.

Young’s modulus measurement of a thin film from experimental nanoindentation performed on multilayer systems. The nanoindentation technique is suitable for the characterization of the mechanical properties of thin films. However, for layers of a few hundred nanometers thick, the substrates as well as the underlying layers are mechanically involved an...

Silicon On Porous Layer (SOPL) substrate was elaborated by applying the Smart Cut T technology to silicon substrate having a superficial porous Si layer. Porous Si layer morphology was characterized after anodisation process. A single crystalline/porous Si bilayer was transferred onto a handling wafer to form SOI like structure. Subsequent bonding...

Extraction des propriétés élastiques d’un film mince à partir de mesures expérimentales de nanoindentation réalisées sur des systèmes multicouches.

Poster présenté à la conférence Matériaux en 2010 à Nantes. Extraction des propriétés élastiques d’un film mince à partir de mesures expérimentales de nanoindentation réalisées sur des systèmes multicouches.

Ce stage de 6 mois au CEA-LETI à Grenoble s’inscrit dans le cadre de ma troisième année à l’Ecole d’ingénieurs PHELMA de l’INPG. Il se déroule en collaboration avec le laboratoire SIMaP de l’INPG sur la thématique du contact électrique pour l’assemblage de puces et plus précisément sur l’étude des matériaux de contact (nickel & aluminium). Dans ce...

The authors apply the conductance method at 25 and 150 °C to GaAs–Al2O3 metal-oxide-semiconductor devices in order to derive the interface state distribution (Dit) as a function of energy in the bandgap. The Dit is governed by two large interface state peaks at midgap energies, in agreement with the unified defect model. S-passivation and forming g...

We will shortly review the basic physics of charge-carrier trapping and emission from trapping states within the bandgap of a semiconductor in order to show that high-temperature capacitance-voltage (C-V) measurements are necessary for GaAs metal-oxide-semiconductor characterization. The midgap trapping states in GaAs have characteristic emission t...