maxence Bigerelle - Academia.edu (original) (raw)
Papers by maxence Bigerelle
International Journal of Surface Science and Engineering, 2009
The relevance of three different techniques (Stylus Profiler (SP), Scanning White-Light Interfero... more The relevance of three different techniques (Stylus Profiler (SP), Scanning White-Light Interferometry (SWLI) and Atomic Force Microscopy (AFM)) to characterise the topography of aluminium and hard steel surfaces, was investigated. Evolution of roughness parameters (Ra and Rt) was analysed according to the evaluation length. Asymptotic Ra values showed good agreement between data measured by SP and by AFM. SWLI data show important discrepancies with the other instruments due to their sensitivity to surface morphologies. AFM is the best instrument to detect micro-roughness but is limited by its maximum evaluation length. SP (2D measures) is, therefore, a good compromise to characterise surface morphologies over a wide spatial range.
HAL (Le Centre pour la Communication Scientifique Directe), Oct 24, 2010
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), May 5, 2009
Journal of Physical Chemistry B, Nov 29, 2017
This study investigates pattern formation during evaporation of water-based nanofluid sessile dro... more This study investigates pattern formation during evaporation of water-based nanofluid sessile droplets placed on a smooth silicon surface at various temperatures. An infrared thermography technique was employed to observe the temperature distribution along the air−liquid interface of evaporating droplets. In addition, an optical interferometry technique is used to quantify and characterize the deposited patterns. Depending on the substrate temperature, three distinctive deposition patterns are observed: a nearly uniform coverage pattern, a "dualring" pattern, and multiple rings corresponding to "stick−slip" pattern. At all substrate temperatures, the internal flow within the drop builds a ringlike cluster of the solute on the top region of drying droplets, which is found essential for the formation of the secondary ring deposition onto the substrate for the deposits with the "dual-ring" pattern. The size of the secondary ring is found to be dependent on the substrate temperature. For the deposits with the rather uniform coverage pattern, the ringlike cluster of the solute does not deposit as a distinct secondary ring; instead, it is deformed by the contact line depinning. In the case of the "stick−slip" pattern, the internal flow behavior is complex and found to be vigorous with rapid circulating flow which appears near the edge of the drop.
HAL (Le Centre pour la Communication Scientifique Directe), Mar 5, 2019
HAL (Le Centre pour la Communication Scientifique Directe), Apr 1, 2021
HAL (Le Centre pour la Communication Scientifique Directe), Aug 28, 2018
The Couette-Taylor flow starts with a laminar azimuthal state at low rotational speed, going to a... more The Couette-Taylor flow starts with a laminar azimuthal state at low rotational speed, going to an intermediate regime by increasing rotational speed with counter-toroidal cells (first instability or Taylor Vortex Flow). Beyond a critical value of rotational speed, various wavy modes break out first, then the flow becomes turbulent. The onset of instabilities depends on the geometry of the system which we use. The aim of this study is to characterize the instabilities (Ta) then to study the effect of surface roughness on the hydrodynamic structures of Couette-Taylor Flow. So different surface conditions for inner cylinder were analyzed: smooth, sandpaper P180 and canvas plastic with different size-mesh. Characterizing the Couette-Taylor flow, a transition point (TVF to WVT) (WVF to MWVF) (MWVF to TTVF) was found to be influenced by surface roughness. For this, a qualitative study using reflecting kalliroscope particles was developed to visualize different flow regimes (Taylor vortex flow, wavy vortex flow, modulated wavy vortex flow and turbulent flow) in both smooth and rough walls. Then a quantitative study is investigated. The results showed that the surface roughness has an effect on the appearance of the instability of Taylor.
HAL (Le Centre pour la Communication Scientifique Directe), Oct 11, 2007
HAL (Le Centre pour la Communication Scientifique Directe), Aug 24, 2015
Connus comme moyens de prototypage rapide, les procédés de fabrication additive ont aujourd'hui u... more Connus comme moyens de prototypage rapide, les procédés de fabrication additive ont aujourd'hui un intérêt capital pourl'industrie moderne qui souhaite étendre leurs utilisations pour la production de petites et moyennes séries. Il reste cependant des questions majeures sur les propriétés mécaniques des pièces ainsi obtenues. Les travaux d'analyses menés au sein duLAMIH portent sur l'étude du comportement dynamique d'éprouvettesen Titane Ti-6Al-4V produites par procédé de fabrication additive EBM (Electron BeamMelting).Les premiers résultats expérimentaux montrent que la vitesse de déformation n'a qu'une faible influence sur le comportement mécanique des éprouvettes. En revanche, la direction de fabrication de ces dernières apparaît être prépondérante quant à la tenue mécanique du matériau. Ce paramètre peut améliorer de 15% le comportement mécanique sous sollicitation dynamique. Des hypothèses quant au lien entre les modes de rupture et la direction de montage sont proposées.
Materials, Jan 9, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
HAL (Le Centre pour la Communication Scientifique Directe), May 1, 2009
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), Aug 28, 2017
Cette communication est un support de la présentation au CFM qui peut se résumer en une phrase « ... more Cette communication est un support de la présentation au CFM qui peut se résumer en une phrase « Création d'un archivage du patrimoine des surfaces rugueuses, tant virtuelles que physiques, en vue de classifier leurs fonctionnalités et de comprendre le rôle de la topographie de surface pour optimiser le domaine de fonctionnalisation de l'objet final ».
Thin Solid Films, Oct 1, 2022
HAL (Le Centre pour la Communication Scientifique Directe), Jun 26, 2019
HAL (Le Centre pour la Communication Scientifique Directe), May 21, 2019
HAL (Le Centre pour la Communication Scientifique Directe), May 11, 2011
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), Oct 11, 2007
Microelectronics Reliability, Nov 1, 2016
Today a point has been reached where lifetimes of power modules are limited by the standard packa... more Today a point has been reached where lifetimes of power modules are limited by the standard packaging technologies, such as wire bonding. To surpass these limits, a new power module was designed using Cu clips as interconnects instead of Al wire bonds. With this new design the structure robustness should be improved and lead to a reliability gain but in counterpart it requires an additional solder layer in order to fix the clip onto the die. This paper studies the failure mechanisms occurring in these two solder layers under power cycling. The behavior of solder layers is precisely analyzed by performing power cycling tests and by taking advantage of Finite Elements simulations. Furthermore an experimental and numerical sensitivity study on test parameters is conducted. Results obtained enable the definition of solder lifetime prediction models.
Surface Topography: Metrology and Properties
Identification of an individual artist’s touch on paintings is studied using surface metrology. P... more Identification of an individual artist’s touch on paintings is studied using surface metrology. Paintings’ topographies were measured using focus variation and stitching, creating 13 × 13 mm maps with 1 μm sampling intervals, and 169 megapixels, with a 10X objective lens. Topographic characterization parameters were analyzed for their ability to differentiate different painters’ renderings. Statistical treatments from data mining were used to discriminate, by optimization, multiscale topographic signatures characterized by a multitude of areal texture parameters. It appears that a fractal dimension can define 3 characteristic scale ranges. One from 3 to 70 μm corresponds to brushstroke details. Another, from 70 to 700 μm, corresponds to the topography of the material of the canvas fabric. Finally, scales greater than 700 μm correspond to undulations of the canvas. For scales less than 50 μm, the fractal structure of the topography left by brushstrokes follows a power law characteriz...
HAL (Le Centre pour la Communication Scientifique Directe), Mar 10, 2014
International Journal of Surface Science and Engineering, 2009
The relevance of three different techniques (Stylus Profiler (SP), Scanning White-Light Interfero... more The relevance of three different techniques (Stylus Profiler (SP), Scanning White-Light Interferometry (SWLI) and Atomic Force Microscopy (AFM)) to characterise the topography of aluminium and hard steel surfaces, was investigated. Evolution of roughness parameters (Ra and Rt) was analysed according to the evaluation length. Asymptotic Ra values showed good agreement between data measured by SP and by AFM. SWLI data show important discrepancies with the other instruments due to their sensitivity to surface morphologies. AFM is the best instrument to detect micro-roughness but is limited by its maximum evaluation length. SP (2D measures) is, therefore, a good compromise to characterise surface morphologies over a wide spatial range.
HAL (Le Centre pour la Communication Scientifique Directe), Oct 24, 2010
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), May 5, 2009
Journal of Physical Chemistry B, Nov 29, 2017
This study investigates pattern formation during evaporation of water-based nanofluid sessile dro... more This study investigates pattern formation during evaporation of water-based nanofluid sessile droplets placed on a smooth silicon surface at various temperatures. An infrared thermography technique was employed to observe the temperature distribution along the air−liquid interface of evaporating droplets. In addition, an optical interferometry technique is used to quantify and characterize the deposited patterns. Depending on the substrate temperature, three distinctive deposition patterns are observed: a nearly uniform coverage pattern, a "dualring" pattern, and multiple rings corresponding to "stick−slip" pattern. At all substrate temperatures, the internal flow within the drop builds a ringlike cluster of the solute on the top region of drying droplets, which is found essential for the formation of the secondary ring deposition onto the substrate for the deposits with the "dual-ring" pattern. The size of the secondary ring is found to be dependent on the substrate temperature. For the deposits with the rather uniform coverage pattern, the ringlike cluster of the solute does not deposit as a distinct secondary ring; instead, it is deformed by the contact line depinning. In the case of the "stick−slip" pattern, the internal flow behavior is complex and found to be vigorous with rapid circulating flow which appears near the edge of the drop.
HAL (Le Centre pour la Communication Scientifique Directe), Mar 5, 2019
HAL (Le Centre pour la Communication Scientifique Directe), Apr 1, 2021
HAL (Le Centre pour la Communication Scientifique Directe), Aug 28, 2018
The Couette-Taylor flow starts with a laminar azimuthal state at low rotational speed, going to a... more The Couette-Taylor flow starts with a laminar azimuthal state at low rotational speed, going to an intermediate regime by increasing rotational speed with counter-toroidal cells (first instability or Taylor Vortex Flow). Beyond a critical value of rotational speed, various wavy modes break out first, then the flow becomes turbulent. The onset of instabilities depends on the geometry of the system which we use. The aim of this study is to characterize the instabilities (Ta) then to study the effect of surface roughness on the hydrodynamic structures of Couette-Taylor Flow. So different surface conditions for inner cylinder were analyzed: smooth, sandpaper P180 and canvas plastic with different size-mesh. Characterizing the Couette-Taylor flow, a transition point (TVF to WVT) (WVF to MWVF) (MWVF to TTVF) was found to be influenced by surface roughness. For this, a qualitative study using reflecting kalliroscope particles was developed to visualize different flow regimes (Taylor vortex flow, wavy vortex flow, modulated wavy vortex flow and turbulent flow) in both smooth and rough walls. Then a quantitative study is investigated. The results showed that the surface roughness has an effect on the appearance of the instability of Taylor.
HAL (Le Centre pour la Communication Scientifique Directe), Oct 11, 2007
HAL (Le Centre pour la Communication Scientifique Directe), Aug 24, 2015
Connus comme moyens de prototypage rapide, les procédés de fabrication additive ont aujourd'hui u... more Connus comme moyens de prototypage rapide, les procédés de fabrication additive ont aujourd'hui un intérêt capital pourl'industrie moderne qui souhaite étendre leurs utilisations pour la production de petites et moyennes séries. Il reste cependant des questions majeures sur les propriétés mécaniques des pièces ainsi obtenues. Les travaux d'analyses menés au sein duLAMIH portent sur l'étude du comportement dynamique d'éprouvettesen Titane Ti-6Al-4V produites par procédé de fabrication additive EBM (Electron BeamMelting).Les premiers résultats expérimentaux montrent que la vitesse de déformation n'a qu'une faible influence sur le comportement mécanique des éprouvettes. En revanche, la direction de fabrication de ces dernières apparaît être prépondérante quant à la tenue mécanique du matériau. Ce paramètre peut améliorer de 15% le comportement mécanique sous sollicitation dynamique. Des hypothèses quant au lien entre les modes de rupture et la direction de montage sont proposées.
Materials, Jan 9, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
HAL (Le Centre pour la Communication Scientifique Directe), May 1, 2009
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), Aug 28, 2017
Cette communication est un support de la présentation au CFM qui peut se résumer en une phrase « ... more Cette communication est un support de la présentation au CFM qui peut se résumer en une phrase « Création d'un archivage du patrimoine des surfaces rugueuses, tant virtuelles que physiques, en vue de classifier leurs fonctionnalités et de comprendre le rôle de la topographie de surface pour optimiser le domaine de fonctionnalisation de l'objet final ».
Thin Solid Films, Oct 1, 2022
HAL (Le Centre pour la Communication Scientifique Directe), Jun 26, 2019
HAL (Le Centre pour la Communication Scientifique Directe), May 21, 2019
HAL (Le Centre pour la Communication Scientifique Directe), May 11, 2011
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), Oct 11, 2007
Microelectronics Reliability, Nov 1, 2016
Today a point has been reached where lifetimes of power modules are limited by the standard packa... more Today a point has been reached where lifetimes of power modules are limited by the standard packaging technologies, such as wire bonding. To surpass these limits, a new power module was designed using Cu clips as interconnects instead of Al wire bonds. With this new design the structure robustness should be improved and lead to a reliability gain but in counterpart it requires an additional solder layer in order to fix the clip onto the die. This paper studies the failure mechanisms occurring in these two solder layers under power cycling. The behavior of solder layers is precisely analyzed by performing power cycling tests and by taking advantage of Finite Elements simulations. Furthermore an experimental and numerical sensitivity study on test parameters is conducted. Results obtained enable the definition of solder lifetime prediction models.
Surface Topography: Metrology and Properties
Identification of an individual artist’s touch on paintings is studied using surface metrology. P... more Identification of an individual artist’s touch on paintings is studied using surface metrology. Paintings’ topographies were measured using focus variation and stitching, creating 13 × 13 mm maps with 1 μm sampling intervals, and 169 megapixels, with a 10X objective lens. Topographic characterization parameters were analyzed for their ability to differentiate different painters’ renderings. Statistical treatments from data mining were used to discriminate, by optimization, multiscale topographic signatures characterized by a multitude of areal texture parameters. It appears that a fractal dimension can define 3 characteristic scale ranges. One from 3 to 70 μm corresponds to brushstroke details. Another, from 70 to 700 μm, corresponds to the topography of the material of the canvas fabric. Finally, scales greater than 700 μm correspond to undulations of the canvas. For scales less than 50 μm, the fractal structure of the topography left by brushstrokes follows a power law characteriz...
HAL (Le Centre pour la Communication Scientifique Directe), Mar 10, 2014