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Auteur Fairouz Bourouis |
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Affiner la recherche Interroger des sources externesEtude du comportement mécanique de structures sandwiches à differents materiaux de revetements / Fairouz Bourouis
Titre : Etude du comportement mécanique de structures sandwiches à differents materiaux de revetements Type de document : texte imprimé Auteurs : Fairouz Bourouis ; Fay?al Mili, Directeur de thèse ; Univ. de Constantine, Éditeur scientifique Année de publication : 2005 Importance : 106 f. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la bibliothèque centrale 01 CD Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Résistance Revêtement Matériau sandwich Ame Flexion cylindrique Flambement Déformations
Sandwich material Coating Heart, Cylindrical bending, buckling,
Resistance, Deformation.Index. décimale : 620 Génie Mécanique Résumé : The sandwich material, present a certain interest in term of rigidity and specific
resistance for the aeronautic structure design. The study of this material meets always
the choice problem of their constituants (coating and heart) in order to load the optimal
mechanical characteristics.
The aim of our work is to do a comparative study of the mechanical behaviour of the
sandwich plates with various materials of coatings charged in cylindrical bending and
compression by taking into account of transverse shearning. For this reason, the
coatings are considered at the base of wood (plywood) or composite laminates ( glass/
epoxy, graphite/epoxy or kevlar /epoxy) of stacking sequence [-
θ
/+
θ
]
5s
and [90
°
/0
°
]
5s
and
the heart is in balsa, aluminium honeycomb, moss herex, or plast honeycomb .The
mechanical behaviour of the sandwich plates was determinated by the use of the
mathematical approaches based on the formulation of the equilibrium equations, and the
development of the classical theory of thin laminated plates .The change of the nature
constituent material as well as the research of the effect of the plate dimensions and the
orientation of fibers reinforcing the composite coatings permit to determine the evolution
of the plates resistance and their deformations, and to calculate the stress in each layer
composing the coatings superior and inferior.
The obtained different results were shaw that the sandwich material with coating in
graphite /epoxy and with heart in aluminium honeycomb resist in buckling and cylindrical
bending better .In return the material at the base of wood (plywood/balsa),is
characterized by a low mechanical resistance. The adequate choice of the coating
material thus ensures a better behaviour of all the sandwich plate.
Diplôme : Magistère En ligne : ../theses/gmecanique/BOU4390.pdf Permalink : index.php?lvl=notice_display&id=881 Etude du comportement mécanique de structures sandwiches à differents materiaux de revetements [texte imprimé] / Fairouz Bourouis ; Fay?al Mili, Directeur de thèse ; Univ. de Constantine, Éditeur scientifique . - 2005 . - 106 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la bibliothèque centrale 01 CD
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Résistance Revêtement Matériau sandwich Ame Flexion cylindrique Flambement Déformations
Sandwich material Coating Heart, Cylindrical bending, buckling,
Resistance, Deformation.Index. décimale : 620 Génie Mécanique Résumé : The sandwich material, present a certain interest in term of rigidity and specific
resistance for the aeronautic structure design. The study of this material meets always
the choice problem of their constituants (coating and heart) in order to load the optimal
mechanical characteristics.
The aim of our work is to do a comparative study of the mechanical behaviour of the
sandwich plates with various materials of coatings charged in cylindrical bending and
compression by taking into account of transverse shearning. For this reason, the
coatings are considered at the base of wood (plywood) or composite laminates ( glass/
epoxy, graphite/epoxy or kevlar /epoxy) of stacking sequence [-
θ
/+
θ
]
5s
and [90
°
/0
°
]
5s
and
the heart is in balsa, aluminium honeycomb, moss herex, or plast honeycomb .The
mechanical behaviour of the sandwich plates was determinated by the use of the
mathematical approaches based on the formulation of the equilibrium equations, and the
development of the classical theory of thin laminated plates .The change of the nature
constituent material as well as the research of the effect of the plate dimensions and the
orientation of fibers reinforcing the composite coatings permit to determine the evolution
of the plates resistance and their deformations, and to calculate the stress in each layer
composing the coatings superior and inferior.
The obtained different results were shaw that the sandwich material with coating in
graphite /epoxy and with heart in aluminium honeycomb resist in buckling and cylindrical
bending better .In return the material at the base of wood (plywood/balsa),is
characterized by a low mechanical resistance. The adequate choice of the coating
material thus ensures a better behaviour of all the sandwich plate.
Diplôme : Magistère En ligne : ../theses/gmecanique/BOU4390.pdf Permalink : index.php?lvl=notice_display&id=881 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/4390 BOU/4390 Thèse Bibliothèque principale Thèses Disponible 
Titre : Optimisation de la rupture et de l’endommagement de differents materiaux sandwichs Type de document : texte imprimé Auteurs : Fairouz Bourouis, Auteur ; F. Mili, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 143 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Poutre sandwiche Flexion trois points Cisaillement transverse Rupture Traction Compression Optimisation Algorithme génétique Génération Sandwich beam Three points bending Transverse shear Face yielding Face wrinkling Optimization Genetic algorithm Generation عمود ساندويش انحناء ذو ثلاث نقاط القص العرضي إنكسار الشد إنكسارالضغط حل مثالي خوارزم جيني جيل Index. décimale : 620 Génie Mécanique Résumé : Knowledge of the failure behavior of sandwich materials, including the study of the processes leading to it is very important due to the increasing use of these materials under more and more arduous conditions. The objective of our work is to perform an optimization study of fracture and damage of sandwich beams with composite laminated coating oriented at [+θ°/-θ°]3s , [+45°/-45°]3s and [0°/90°]3s loaded in three points bending. This task was carried out by means of stochastic methods such as genetic algorithms for locating the optimum of a
function in the space of parameters valorised. The overall law behavior of sandwich structure into two failure modes of face yielding and face wrinkling is determined by the use of mathematical approaches based on the formulation of the equilibrium equations and laminated
structures theory taking into account transverse shear stresses and sandwish beams theory. Stresses in each component layer coatings, upper and lower, are calculated in accordance with maximum stress criterion. The changing of the material coating nature and research of the orientation effect of the fiber reinforcement and transverse shear stresses are used to determine the performance of the sandwich structure into two failure modes of face yielding and face wrinkling. In order to increase the performance of sandwich beams, in three points ending, an optimization program based on the principles of genetic algorithms has been developed to maximize the tensile strength in the two ailure modes of face yielding and face wrinkling, depending on the orientation of plies : 0°, + 45°, - 45 ° and 90°. The equations used to evaluate
the individuals in population results from the classical laminate theory with discrete variables.
Operators of genetic algorithms (selection, crossover and mutation) are applied to the children of a hundred generations. To achieve optimal solutions, the result appeared effective despite all the non deterministic nature of genetic algorithms. But, to achieve maximum effectiveness, it is important to choose smartly the parameters of genetic algorithms depending on the nature of the problem studied and the mechanical characteristics of the function to be optimized.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU6330.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6300 Optimisation de la rupture et de l’endommagement de differents materiaux sandwichs [texte imprimé] / Fairouz Bourouis, Auteur ; F. Mili, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2013 . - 143 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Poutre sandwiche Flexion trois points Cisaillement transverse Rupture Traction Compression Optimisation Algorithme génétique Génération Sandwich beam Three points bending Transverse shear Face yielding Face wrinkling Optimization Genetic algorithm Generation عمود ساندويش انحناء ذو ثلاث نقاط القص العرضي إنكسار الشد إنكسارالضغط حل مثالي خوارزم جيني جيل Index. décimale : 620 Génie Mécanique Résumé : Knowledge of the failure behavior of sandwich materials, including the study of the processes leading to it is very important due to the increasing use of these materials under more and more arduous conditions. The objective of our work is to perform an optimization study of fracture and damage of sandwich beams with composite laminated coating oriented at [+θ°/-θ°]3s , [+45°/-45°]3s and [0°/90°]3s loaded in three points bending. This task was carried out by means of stochastic methods such as genetic algorithms for locating the optimum of a
function in the space of parameters valorised. The overall law behavior of sandwich structure into two failure modes of face yielding and face wrinkling is determined by the use of mathematical approaches based on the formulation of the equilibrium equations and laminated
structures theory taking into account transverse shear stresses and sandwish beams theory. Stresses in each component layer coatings, upper and lower, are calculated in accordance with maximum stress criterion. The changing of the material coating nature and research of the orientation effect of the fiber reinforcement and transverse shear stresses are used to determine the performance of the sandwich structure into two failure modes of face yielding and face wrinkling. In order to increase the performance of sandwich beams, in three points ending, an optimization program based on the principles of genetic algorithms has been developed to maximize the tensile strength in the two ailure modes of face yielding and face wrinkling, depending on the orientation of plies : 0°, + 45°, - 45 ° and 90°. The equations used to evaluate
the individuals in population results from the classical laminate theory with discrete variables.
Operators of genetic algorithms (selection, crossover and mutation) are applied to the children of a hundred generations. To achieve optimal solutions, the result appeared effective despite all the non deterministic nature of genetic algorithms. But, to achieve maximum effectiveness, it is important to choose smartly the parameters of genetic algorithms depending on the nature of the problem studied and the mechanical characteristics of the function to be optimized.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU6330.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6300 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/6330 BOU/6330 Thèse Bibliothèque principale Thèses Disponible Documents numériques
texte intégraleAdobe Acrobat PDF
