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18 results on '"Deschanel, Stéphanie"'

4. Statistical properties of microcracking in polyurethane foams under tensile test, influence of temperature and density

Author

Deschanel, Stéphanie, Vanel, Loïc, Vigier, Gérard, Godin, Nathalie, and Ciliberto, Sergio

Subjects
Condensed Matter - Materials Science, Physics - Classical Physics
Abstract

We report tensile failure experiments on polyurethane (PU) foams. Experiments have been performed by imposing a constant strain rate. We work on heterogeneous materials for whom the failure does not occur suddenly and can develop as a multistep process through a succession of microcracks that end at pores. The acoustic energy and the waiting times between acoustic events follow power-law distributions. This remains true while the foam density is varied. However, experiments at low temperatures (PU foams more brittle) have not yielded power-laws for the waiting times. The cumulative acoustic energy has no power law divergence at the proximity of the failure point which is qualitatively in agreement with other experiments done at imposed strain. We notice a plateau in cumulative acoustic energy that seems to occur when a single crack starts to propagate.

Published
2007
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5. Subcritical crack growth in fibrous materials

Author

Santucci, Stéphane, Cortet, Pierre-Philippe, Deschanel, Stéphanie, Vanel, Loic, and Ciliberto, Sergio

Subjects
Condensed Matter - Materials Science, Physics - Classical Physics
Abstract

We present experiments on the slow growth of a single crack in a fax paper sheet submitted to a constant force $F$. We find that statistically averaged crack growth curves can be described by only two parameters : the mean rupture time $\tau$ and a characteristic growth length $\zeta$. We propose a model based on a thermally activated rupture process that takes into account the microstructure of cellulose fibers. The model is able to reproduce the shape of the growth curve, the dependence of $\zeta$ on $F$ as well as the effect of temperature on the rupture time $\tau$. We find that the length scale at which rupture occurs in this model is consistently close to the diameter of cellulose microfibrils.

Published
2007
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6. Acoustic emission classification by cross-correlation

Author

de la Selle, Théotime, Deschanel, Stéphanie, Weiss, Jérôme, Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), and Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA)

Subjects
Acoustic emission, fatigue crack growth, [SPI]Engineering Sciences [physics], multiplets, cross-correlation, waveform clustering
Abstract

International audience; Acoustic emission signals specific to the incremental advance of fatigue cracks can be detected, cycle after cycle, during crack propagation tests. They were termed acoustic multiplets in reference to repeating earthquakes. Detecting such multiplets would give information about the fracturing process and provide early warnings when monitoring industrial parts in service. We developed a clustering method to extract multiplets signals from all signals and noise of fatigue tests. This method is based on the computation of the cross-correlation function between waveforms. On the distribution of the cross-correlation matrix, signals belonging to multiplets are clearly identified and permit to automatically clustered. This paper developps the steps of the method, presents results obtained on a dataset of a fatigue test and shows its noise robustness.

Published
2022

7. Detection and characterization of fatigue crack growth by acoustic emission and digital image correlation

Author

de la Selle, Théotime, Deschanel, Stéphanie, Weiss, Jérôme, Lachambre, Joël, Réthoré, Julien, Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA), Institut de Recherche en Génie Civil et Mécanique (GeM), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Nantes (Nantes Univ - ECN), Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université - Institut Universitaire de Technologie Saint-Nazaire (Nantes Univ - IUT Saint-Nazaire), Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - Ecole Polytechnique de l'Université de Nantes (Nantes Univ - EPUN), and Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)

Subjects
[SPI]Engineering Sciences [physics], digital image correlation, acoustic multiplets, Fatigue crack growth, acoustic emission
Abstract

International audience; Des signaux d'émission acoustique (EA) spécifiques à l'avancée incrémentale de fissure de fatigue peuvent etre détectés, cycles après cycles lors d'essais de propagation de fissure dans les métaux : ce sont des multiplets acoustiques. Afin d'en savoir plus sur les mécanismes physiques à leur source, une analyse de corrélation d'images numériques (DIC) couplée à l'EA est menée dans cette étude. Il est montré que ce type d'analyse est efficace pour distinguer les multiplets issus de 2 catégories de sources : la propagation de fissure par rupture ou plasticité en pointe de fissure et le frottement des lèvres contre elles-meme.

Published
2022

9. Acoustic emission signatures of damage mechanisms occuring during fatigue tests on CMC. Unsupervised and supervised classification of AE data [Identification de la signature acoustique des différents mécanismes d'endommagement lors d'essais de fatigue sur CMC Application de classificateurs supervisé et non supervisé]

Author

Godin, Nathalie, Deschanel, Stéphanie, R'Mili, Mohamed, Reynaud, Pascal, Lamon, J., Fantozzi, Gilbert, Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de la Santé des Végétaux, Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail (ANSES), Laboratoire de Mécanique et Technologie (LMT), and École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Unsupervised classification, Classification (of information), Damage mechanism, Fatigue testing, High temperature, [SPI.MAT]Engineering Sciences [physics]/Materials, Failure (mechanical), Damage, Acoustic emissions, CMC, Acoustic emission signature, Supervised classification, Fatigue damage, Fatigue of materials
Abstract

cited By 0; International audience; The intent of this paper is to identify the damage phenomena controlling the life of composites at high temperatures (> 600°C), and to measure the kinetics of these phenomena during mechanical tests. The analysis of AE data provides a classification into groups of signals having similar characteristics that can be afterward associated to one or to several damage mechanisms. A method of unsupervised classification was used to differentiate the signals resulting from various mechanisms of damage and from failures. Then, a method of supervised classification was developed, so as to establish a classification in real-time whatever the temperature, the applied constraint and the mode loading (static or cyclic). © 2013 Lavoisier.

Published
2013

10. Acoustic Emission: identification of the acoustic signature of damage mechanisms and lifetime prediction

Author

Godin, Nathalie, Deschanel, Stéphanie, Courbon, Joel, Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS
Abstract

International audience; no abstract

Published
2009

13. A l'écoute des matériaux: à la recherche de l'invisible

Author

Stéphanie Deschanel and Deschanel, Stéphanie

Subjects
Rupture, Plasticity, Matériaux, [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Damage, Fracture, Plasticité, [PHYS.MECA.MEMA] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], Emission Acoustique, [PHYS.MECA.ACOU] Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], Acoustic Emission, Materials, Endommagent, Fatigue, Fractoluminescence
Published
2021

14. Pattern production and recovery by transformation

Author

Boyce, Mary C., Tom Mullin, Stéphanie Deschanel, Katia Bertoldi, and Deschanel, Stéphanie

Subjects
[PHYS.MECA.ACOU] Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

no abstract

Published
2014

15. Stress−strain behavior of a polyurea and a polyurethane from low to high strain rates

Author

Stéphanie Deschanel, Mary C. Boyce, Sai Sarva, Weinong Chen, Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Purdue University [West Lafayette], and Deschanel, Stéphanie

Subjects
Materials science, Polymers and Plastics, Strain (chemistry), Tension (physics), Organic Chemistry, Stress–strain curve, 02 engineering and technology, Strain rate, 021001 nanoscience & nanotechnology, Compression (physics), [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], chemistry.chemical_compound, 020303 mechanical engineering & transports, 0203 mechanical engineering, chemistry, Ultimate tensile strength, Materials Chemistry, Composite material, [PHYS.MECA.ACOU] Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, Polyurethane, Polyurea
Abstract

The large deformation stress–strain behavior of thermoplastic–elastomeric polyurethanes and elastomeric-thermoset polyureas is strongly dependent on strain rate. Their mechanical behavior at very high strain rates is of particular interest due to their role as a protective coating on structures to enhance structural survivability during high rate loading events. Here we report on the uniaxial compression stress–strain behavior of a representative polyurea and a representative polyurethane over a wide range in strain rates, from 0.001 s−1 to 10,000 s−1, successively marching through each order of magnitude in strain rate using equipment relevant for testing at each particular rate. These results are further analyzed in association with recently reported compressive data on the same materials by Yi et al. [Polymer 2006;47(1):319–29] and intermediate rate tensile data on the same polyurea by Roland et al. [Polymer 2007;48(2):574–8]. The polyurea tested is seen to undergo transition from a rubbery-regime behavior at low rates to a leathery-regime behavior at the highest rates, consistent with the earlier compression study as well as the recent tension study; the polyurethane tested is observed to undergo transition from a rubbery-regime behavior at the low rates to a glassy behavior at the highest rates. The uniaxial compression data for the polyurea are found to be fully consistent with the recently reported uniaxial tension data over the range of rates studied, demonstrating the consistency and complementary aspects of testing at high rates in both compression and tension.

Published
2007

16. RATE DEPENDENT MECHANICAL PERFORMANCE OF ETHYLENE METHACRYLIC ACID(EMAA) COPOLYMERS AND POSS‐ENHANCED EMAA NANOCOMPOSITES

Author

Stéphanie Deschanel, Boyce, Mary C., Cohen, Robert E., Deschanel, Stéphanie, Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.ACOU] Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience; no abstract

Published
2007

17. Large deformation rate‐dependent stress‐strain behavior of polyurea and polyurethane

Author

Sai Sarva, Stéphanie Deschanel, Boyce, Mary C., Weinong Chen, Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Purdue University [West Lafayette], and Deschanel, Stéphanie

Subjects
[PHYS.MECA.ACOU] Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience; no abstract

Published
2007

18. Dynamic of fracture precursors in heterogeneous materials : application to vitreous polymer foams

Author

Deschanel , Stephanie, Deschanel, Stéphanie, Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), INSA de Lyon, Gérard Vigier(gerard.vigier@insa-lyon.fr), collaboration avec le laboratoire de Physique de l'ENS de Lyon, Matériaux, ingénierie et science [Villeurbanne] ( MATEIS ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ) -Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), and Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA )

Subjects
Rupture, [ SPI.MECA ] Engineering Sciences [physics]/Mechanics [physics.med-ph], Loi de puissance, Heterogeneous materials, Emission acoustique, Mechanical tests, Matériaux hétérogènes, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], Précurseurs à la rupture, [SPI.MECA] Engineering Sciences [physics]/Mechanics [physics.med-ph], Acoustic emission, Power law, Fracture precursors, Fracture, Essais mécaniques, Statistical analysis, Mousses polymères, Polymer foams, Analyse statistique
Abstract

In order to predict failure time of materials, a new approach has been considered : fracture can be viewed as a critical phenomenon. For some materials fracture can be seen as a clustering of microcracks. We focus on heterogeneous materials (vitreous polymer foams) whose fracture can be described as a phase transition. Our main experimental tool is the monitoring of the acoustic emission signatures of the microfractures, which occur during mechanical tests. We highlighted diffuse microcrack nucleation and progressive localization into a dominating crack with a good fit of the energy by a power law. The exponent of this power law does not seem to depend neither on the material density, the loading mode, nor the behavior law. The time intervals between two damaging events seem to be power law distributed only if the stress remains nearly constant for the most part of the test. A critical region where the cumulative energy could be described by a power law appears only for creep tests., De nouvelles approches physiques concernant les mécanismes d'endommagement consistent à considérer le phénomène de rupture comme le point critique d'une transition de phase. La rupture peut alors se traduire pour certains matériaux par une percolation de microfissures. Cette multi-fissuration implique le choix de matériaux hétérogènes. Des essais mécaniques sur mousses polymères solides sont conduits jusqu'à rupture, couplés au suivi de l'activité acoustique. Les distributions des énergies révèlent des lois de puissance indépendamment de la densité du matériau, du mode de chargement ou des lois de comportement. En revanche, la conformité à une loi de puissance des intervalles de temps semble exiger une contrainte quasi constante sur la plus grande partie de l'essai. L'allure de l'énergie cumulée dans le cas d'essais de fluage semblerait présenter une loi de puissance sur une plage de temps restreinte. En revanche, pour les essais de traction, aucune loi de puissance n'est observée.

Published
2005

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