Résultat de la recherche
3 recherche sur le tag
'énergie de déformation' 
Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche Interroger des sources externes
Titre : Analyse dynamique des structures mécaniques par la méthode des éléments finis. Type de document : texte imprimé Auteurs : Fareh Hamrit, Auteur ; Brahim Necib, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 135 f. Format : 30 cm. Note générale : copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Structures mécaniques rigidité déformation contrainte modes de vibration éléments finis élément barre élément poutre élément plaque assemblage énergie de déformation forces internes Mechanical structures stiffness deformation stress vibration modes finite elements bar
element beam element plate element assembly deformation energy internal forces الهياكل الميكانيكية وصلابة وتشوه والإجهاد وسائط الاهتزاز والعناصر المحدودة عنصر شريط عنصر شعاع عنصر لوحة والتجمع والطاقة تشوه القوى الداخليةIndex. décimale : 620 Génie Mécanique Résumé : The mechanicaldiscrete or continuumstructures are actually of great importance in the application field of contemporary modern industry. However, during their life time these structures are often subjected to considerable external stresses or to high amplitudes of vibrations which can cause them large deformations and internal stresses which can cause them internal cracking or even their total destruction. In order to avoid these types of problems, the concept of static and dynamic analysis of these structures is recommended, and due to the complexity of their shape and size, the finite element method is the most used. The latter is currently recognized as a very powerful technique for the static and dynamic analysis of discrete or continuous structures of complicated form applied in the field of mechanics, aeronautics, civil engineering, maritime or robotics. Consequently, the calculation and
dimensioning of these mechanical systems by the finite element method plays an important role at the service of the industry for possible sizing and prediction of their lifetime. Our work consists of static and dynamic analysis of two-dimensional discrete and continuous mechanical systems using the finite element method based on the main elements of bars, beams and plates, under the effect of external excitations with different boundary conditions. The discrete structures considered are twodimensional in metallic framework interconnected to the nodes by welding, riveting or bolted under various boundary conditions. Their elements are modeled comparatively by bar elements and beam elements, while for continuous structures the elements are rectangular thin plates with different boundary conditions. The excitation forces are based on periodic, random or impulsive forces and a numerical solution by development of a program to describe the behavior of these structures is realized. The mass and stiffness matrices of all the structures are determined respectively by assembling the bars, beam and plate elements based on the kinetic and deformation energy for each element. The displacements, the node reactions and the axial forces in all the elements as well as the transverse stresses and the eigenvalues of the structures under different boundary conditions were also calculated and good results were obtained compared to those obtained using other software
Already existing. In fact, analysis using the finite element method will allow the proper dimensioning and design of complex industrial mechanical structures according to different boundary conditions, their internal loading and their vibratory level.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/HAM7246.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10839 Analyse dynamique des structures mécaniques par la méthode des éléments finis. [texte imprimé] / Fareh Hamrit, Auteur ; Brahim Necib, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 135 f. ; 30 cm.
copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Structures mécaniques rigidité déformation contrainte modes de vibration éléments finis élément barre élément poutre élément plaque assemblage énergie de déformation forces internes Mechanical structures stiffness deformation stress vibration modes finite elements bar
element beam element plate element assembly deformation energy internal forces الهياكل الميكانيكية وصلابة وتشوه والإجهاد وسائط الاهتزاز والعناصر المحدودة عنصر شريط عنصر شعاع عنصر لوحة والتجمع والطاقة تشوه القوى الداخليةIndex. décimale : 620 Génie Mécanique Résumé : The mechanicaldiscrete or continuumstructures are actually of great importance in the application field of contemporary modern industry. However, during their life time these structures are often subjected to considerable external stresses or to high amplitudes of vibrations which can cause them large deformations and internal stresses which can cause them internal cracking or even their total destruction. In order to avoid these types of problems, the concept of static and dynamic analysis of these structures is recommended, and due to the complexity of their shape and size, the finite element method is the most used. The latter is currently recognized as a very powerful technique for the static and dynamic analysis of discrete or continuous structures of complicated form applied in the field of mechanics, aeronautics, civil engineering, maritime or robotics. Consequently, the calculation and
dimensioning of these mechanical systems by the finite element method plays an important role at the service of the industry for possible sizing and prediction of their lifetime. Our work consists of static and dynamic analysis of two-dimensional discrete and continuous mechanical systems using the finite element method based on the main elements of bars, beams and plates, under the effect of external excitations with different boundary conditions. The discrete structures considered are twodimensional in metallic framework interconnected to the nodes by welding, riveting or bolted under various boundary conditions. Their elements are modeled comparatively by bar elements and beam elements, while for continuous structures the elements are rectangular thin plates with different boundary conditions. The excitation forces are based on periodic, random or impulsive forces and a numerical solution by development of a program to describe the behavior of these structures is realized. The mass and stiffness matrices of all the structures are determined respectively by assembling the bars, beam and plate elements based on the kinetic and deformation energy for each element. The displacements, the node reactions and the axial forces in all the elements as well as the transverse stresses and the eigenvalues of the structures under different boundary conditions were also calculated and good results were obtained compared to those obtained using other software
Already existing. In fact, analysis using the finite element method will allow the proper dimensioning and design of complex industrial mechanical structures according to different boundary conditions, their internal loading and their vibratory level.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/HAM7246.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10839 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité HAM/7246 HAM/7246 Thèse Bibliothèque principale Thèses Disponible
Titre : Structures et Matériaux utilisés en Aéronautique : État de l’Art et Analyse de leur Déformation sous l’effet des Sollicitations Extérieures. Type de document : texte imprimé Auteurs : Fayssal Hadjez, Auteur ; Brahim Necib, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 136 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Structures aéronefs modélisation éléments fini énergie de déformation matrice de
rigidité joints adhésive nanoparticules simulation aircraft modelling finite element strain energy matrix rigidity attached adhesive الهياكل الطائرات هياكل الطائرات نمذجة العناصر المنتهية طاقة التشويه مصفوفة الصلابة لاصقة التجمعIndex. décimale : 620 Génie Mécanique Résumé : Internal structures in aeronautical, aircraft or space structures are composed of bar elements or lightweight beams assembled by welding, riveting or bolting of simple or complex geometric shapes. They are covered with lightweight materials such as: Aluminium, composite materials, or adaptable materials. The assembly of all these elements and materials constitutes a structure of high rigidity and high quality of mechanical strength as well as a state of the art very considerable in the field of aeronautics and aerospace. In this context, a presentation of the different materials and their state of the art in the field of the application of aeronautics will be presented. A theoretical analysis and modelling by the finite element method these structures has been studied. This analysis can be performed discretely (element by element) using the method of the bar elements, beam element or plate elements or by continuous models representing the discrete structure and the material that
covers it. An analysis of the stresses in the main parts of the aircraft was presented for different types of materials and internal structures of aircraft wings in the static state. Experimental and numerical characterizations of nanoparticles bonded joints typically used in aerospace applications are presented. First, samples of single-lap joints produced using a composite reinforced with carbon fibre fabric (2% graphéne by weight), were analysed. Shear tests were performed to measure the resistances of the bonded joints, to assess the structural performances of the structures with and without nanoparticles. Second, finite-element numerical models were applied based on experiments on adhesive joints; in particular a numerical simulation of the adhesive lap-joint model was performed using ANSYS software. Analyses were performed for the joints with unfilled and
nanoparticles adhesive, focusing on the cooling process during which adhesive single-lap joints are mainly generated. The experimental and numerical model results generally agree quite well. The nanoparticles of the Graphéne increased the stiffness of each lap joint under a rational load charge.
The nanostructure adhesive increased the failure load, but this increase depended on various parameters, including adhesive structural features and the structures of the nanostructures produced. The reinforced adhesive nanostructure was found to decrease the weight.
Diplôme : Doctorat En ligne : ../theses/gmecanique/HAD7298.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10913 Structures et Matériaux utilisés en Aéronautique : État de l’Art et Analyse de leur Déformation sous l’effet des Sollicitations Extérieures. [texte imprimé] / Fayssal Hadjez, Auteur ; Brahim Necib, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 136 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Structures aéronefs modélisation éléments fini énergie de déformation matrice de
rigidité joints adhésive nanoparticules simulation aircraft modelling finite element strain energy matrix rigidity attached adhesive الهياكل الطائرات هياكل الطائرات نمذجة العناصر المنتهية طاقة التشويه مصفوفة الصلابة لاصقة التجمعIndex. décimale : 620 Génie Mécanique Résumé : Internal structures in aeronautical, aircraft or space structures are composed of bar elements or lightweight beams assembled by welding, riveting or bolting of simple or complex geometric shapes. They are covered with lightweight materials such as: Aluminium, composite materials, or adaptable materials. The assembly of all these elements and materials constitutes a structure of high rigidity and high quality of mechanical strength as well as a state of the art very considerable in the field of aeronautics and aerospace. In this context, a presentation of the different materials and their state of the art in the field of the application of aeronautics will be presented. A theoretical analysis and modelling by the finite element method these structures has been studied. This analysis can be performed discretely (element by element) using the method of the bar elements, beam element or plate elements or by continuous models representing the discrete structure and the material that
covers it. An analysis of the stresses in the main parts of the aircraft was presented for different types of materials and internal structures of aircraft wings in the static state. Experimental and numerical characterizations of nanoparticles bonded joints typically used in aerospace applications are presented. First, samples of single-lap joints produced using a composite reinforced with carbon fibre fabric (2% graphéne by weight), were analysed. Shear tests were performed to measure the resistances of the bonded joints, to assess the structural performances of the structures with and without nanoparticles. Second, finite-element numerical models were applied based on experiments on adhesive joints; in particular a numerical simulation of the adhesive lap-joint model was performed using ANSYS software. Analyses were performed for the joints with unfilled and
nanoparticles adhesive, focusing on the cooling process during which adhesive single-lap joints are mainly generated. The experimental and numerical model results generally agree quite well. The nanoparticles of the Graphéne increased the stiffness of each lap joint under a rational load charge.
The nanostructure adhesive increased the failure load, but this increase depended on various parameters, including adhesive structural features and the structures of the nanostructures produced. The reinforced adhesive nanostructure was found to decrease the weight.
Diplôme : Doctorat En ligne : ../theses/gmecanique/HAD7298.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10913 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité HAD/7298 HAD/7298 Thèse Bibliothèque principale Thèses Disponible Distorsion du réseau cristallin des alliages ternaires Cd1-x Zn xTe. Généralisation à d'autres alliages / Louiza Arab
Titre : Distorsion du réseau cristallin des alliages ternaires Cd1-x Zn xTe. Généralisation à d'autres alliages Type de document : texte imprimé Auteurs : Louiza Arab ; Univ. de Constantine, Éditeur scientifique ; K. Guergouri, Directeur de thèse Année de publication : 2004 Importance : 87 f. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magasin de la bibliothèque centrale Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Structure blende de zinc Cd1-x ZnxTe Energie de déformation Modèle tétraédrique Index. décimale : 530 Physique Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=2889 Distorsion du réseau cristallin des alliages ternaires Cd1-x Zn xTe. Généralisation à d'autres alliages [texte imprimé] / Louiza Arab ; Univ. de Constantine, Éditeur scientifique ; K. Guergouri, Directeur de thèse . - 2004 . - 87 f.
01 Disponible à la salle de recherche 02 Disponibles au magasin de la bibliothèque centrale
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Structure blende de zinc Cd1-x ZnxTe Energie de déformation Modèle tétraédrique Index. décimale : 530 Physique Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=2889 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité ARA/4144 ARA/4144 Thèse Bibliothèque principale Thèses Disponible
