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5 results on '"Alexis Delattre"'

1. On the dynamical behavior of filled rubbers at different temperatures: Experimental characterization and constitutive modeling

Author

Florian Lacroix, Alexis Delattre, Stéphane Lejeunes, Stéphane Méo, Airbus Helicopter, Airbus [France], Matériaux et Structures (M&S), Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique et de Rhéologie (LMR), Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Polytech'Tours, Université de Tours (UT)-Polytech'Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours-Polytech'Tours

Subjects
Work (thermodynamics), Materials science, Constitutive equation, 02 engineering and technology, Viscoelasticity, Preload, [SPI]Engineering Sciences [physics], 0203 mechanical engineering, Natural rubber, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], General Materials Science, Composite material, Multi-axial, Applied Mathematics, Mechanical Engineering, Temperature, Carbon black, Mechanics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Filled rubber, Characterization (materials science), Payne effect, 020303 mechanical engineering & transports, Amplitude, Mechanics of Materials, Modeling and Simulation, visual_art, visual_art.visual_art_medium, 0210 nano-technology
Abstract

International audience; This work focuses on the characterization and the modeling of the complex dynamical behavior of a butadiene rubber filled with carbon black. This material is used in helicopter rotors and submitted to severe operating conditions. In particular the effects of the environmental temperature, of the amplitudes and frequencies of cyclic loading are studied. A new constitutive model that takes into account the Payne effect, the frequency, temperature and pre-loading dependencies is proposed. A specific material parameter fitting strategy is also introduced.

Published
2016
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2. A constitutive multiphysics modeling for nearly incompressible dissipative materials: application to thermo–chemo-mechanical aging of rubbers

Author

Komla Dela Ahose, Alexis Delattre, Stéphane Lejeunes, Adnane Boukamel, Dominique Eyheramendy, Stéphane Méo, Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 (LAMIH), Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Centre National de la Recherche Scientifique (CNRS), L'Institut de Recherche Technologique (IRT) de la filière Ferroviaire (IRT Railenium), Université Polytechnique Hauts-de-France (UPHF), Airbus Helicopters, Aeroport International de Marseille-Provence, Laboratoire de Mécanique et de Rhéologie (LMR), Université de Tours (UT)-Polytech'Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et Procédés (MMP), Laboratoire de Mécanique Gabriel Lamé (LaMé), Université d'Orléans (UO)-Université de Tours (UT)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université d'Orléans (UO)-Université de Tours (UT)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Centre National de la Recherche Scientifique (CNRS)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Polytech'Tours, Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours-Polytech'Tours, Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours-Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours

Subjects
Materials science, Chemo mechanical, Chemo-physical aging, Mechanical Engineering, General Chemical Engineering, Multiphysics, Aerospace Engineering, 02 engineering and technology, 021001 nanoscience & nanotechnology, Soft materials, Incompressible material, Filled rubber, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], 020303 mechanical engineering & transports, 0203 mechanical engineering, Self-heating, Finite strain theory, Solid mechanics, Dissipative system, Compressibility, General Materials Science, Composite material, 0210 nano-technology
Abstract

International audience; In this paper we investigate the modeling of chemo-physical evolution due to thermo-mechanical loadings at finite strain in soft materials. In particular we discuss the question of a proper and consistent thermodynamical formulation in the case of nearly incompressible materials. The objective of this phenomenological modeling is to represent the thermo–chemo-mechanical aging that occurs in filled rubbers during high-cycle fatigue for some specific loading conditions.

Published
2018
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3. Congenital Nasal Pyriform Aperture Stenosis: Diagnosis and Management

Author

Pierre Fayoux, Alexis Delattre, and Marion Devambez

Subjects
Male, medicine.medical_specialty, medicine.medical_treatment, Population, Tissue Adhesions, Physical examination, Constriction, Pathologic, Turbinates, Postoperative Complications, Nose Diseases, otorhinolaryngologic diseases, medicine, Humans, education, Ulcer, Nose, Nasal Septum, Retrospective Studies, Respiratory Distress Syndrome, Newborn, education.field_of_study, medicine.diagnostic_test, business.industry, Respiration, Infant, Newborn, Infant, Stent, Endoscopy, Airway obstruction, medicine.disease, Surgery, Nasal decongestant, Nasal Decongestants, Nasal Mucosa, Stenosis, medicine.anatomical_structure, Otorhinolaryngology, Gastroesophageal Reflux, Female, Stents, Radiology, Nasal Cavity, Nasal Obstruction, Oral Surgery, Tomography, X-Ray Computed, business, Follow-Up Studies
Abstract

Objectives: To review diagnosis and treatment modalities in congenital nasal pyriform aperture stenosis in a newborn population. Study Design: A 6-year retrospective case series review. Mean follow-up of 21.8 months. Setting: University hospital, tertiary care center. Patients: Twenty-one consecutive patients treated for congenital nasal pyriform aperture stenosis. Diagnosis was suspected on physical examination and confirmed by computed tomography scan. Associated abnormalities were present in 15 patients. Surgical Treatment: Nineteen patients underwent surgical treatment focused on external bony margins of pyriform aperture and the osseous anterior edge of the inferior turbinate, drilling by a sublabial approach and associated with a partial turbinectomy in seven cases. A stent was placed for 7 to 10 days. A conservative treatment based on topical nasal decongestants and gastroesophageal reflux treatment was proposed for two patients. Results: Postoperative follow-up revealed septal ulceration in five cases with septal perforation in one case and development of synechiae in two cases. Follow-up revealed normal nasal breathing and pyriform aperture growth after surgery. Conclusion: Our experience confirmed the link described between congenital nasal pyriform aperture stenosis and holoprosencephaly, but associated extracraniofacial malformations suggest that congenital nasal pyriform aperture stenosis should be integrated in a systemic malformative syndrome or genetic disorder and lead us to propose an exhaustive dysmorphology assessment. Some infants may be treated by conservative management, and severely affected patients may undergo surgery by a sublabial approach.

Published
2009
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4. On the multiaxial amplitude and frequency dependent behavior of rubber: experiments and constitutive modeling

Author

Alexis Delattre, Caroline Richard, Stéphane Méo, Stéphane Lejeunes, Florian Lacroix, Laboratoire de Mécanique et de Rhéologie (LMR), Université de Tours (UT)-Polytech'Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Matériaux et Structures (M&S), Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours-Polytech'Tours, Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Polytech'Tours

Subjects
Materials science, Polymers and Plastics, Tension (physics), Mechanics, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], Compression (physics), Shear (sheet metal), Simple shear, Payne effect, Amplitude, Natural rubber, visual_art, Hyperelastic material, Materials Chemistry, visual_art.visual_art_medium, Composite material, ComputingMilieux_MISCELLANEOUS
Abstract

A phenomenological hyperviscoelastic model is proposed. This model describes the multiaxial amplitude- and frequency-dependent behavior of the material. Moreover, thanks to the definition of new internal variables, the model is able to take into account the Payne effect. The experimental results of a characterization campaign performed on a butadiene rubber filled with carbon black particles are then presented. These tests were conducted under tension/compression and simple shear at several frequencies and amplitudes. Using these experimental data, a fast and robust method is presented to identify the material parameters. There are two steps in this method: the first step regards the hyperelastic behavior and the second step the viscous behavior. The identified model provides good correlations with the tests for describing the dynamical effects under both shear and tension loads.

Published
2014
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