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Auteur Brahim Necib |
Documents disponibles écrits par cet auteur (9)



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 : 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 : 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 Analyse et modélisation des fissurations dans les plaques trouées sous l’effet des conditions extérieures. / Sofiane Chorfi
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Titre : Analyse et modélisation des fissurations dans les plaques trouées sous l’effet des conditions extérieures. Type de document : texte imprimé Auteurs : Sofiane Chorfi, Auteur ; Brahim Necib, Directeur de thèse Mention d'édition : 27/01/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 142 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : G. Mécanique:Construction mécanique Plaques trouées trous circulaires trous elliptiques fissuration facteurs d’intensités de contraintes modes de rupture méthodes numériques conditions extérieures Holed plates circular holes elliptical holes cracking intensity stress factors breaking modes numerical methods external conditions الألواح مثقوبة ثقب دائریة ثقب بیضاویة الشكل، تكسیر عوامل شدة الإجھاد طرق التكسر أسالیب حسابیة ظروف خارجیة Index. décimale : 620 Génie Mécanique Résumé :
The problem of cracks in continuous structures such as plates, beams, bars, trellis or hulls is often very apparent around riveting holes, notches or other connecting leaves. In fact, the holed plates assembled by riveting or bolted are of great importance in the fields of applications of mechanics, aeronautics, aerospace and civil engineering and they can be the object of considerable cracking around their holes. The presence of these cracks leads to a weakening of the structure as a result of concentrations of local stresses or deformations that can decrease their lifespan or even cause their total rupture or their disaster. These stress concentrators are often unavoidable due to the effect of external conditions such as: forces, stresses, temperature changes, humidity and others. It is therefore necessary to know these stress intensity factors associated with each geometrical plate, in order to analyse its state of stress and strain state as well as its cracking modes which can be according to modes I, II and III or mixed mode. The analysis of the propagation of cracks in industrial plate structures leads to evaluating their lifespan before their sudden rupture. In our work consists of the static and dynamic analysis of the propagation cracks around circular, elliptical holes and other shapes in thin 2D (two-dimensional) aluminum plates under the effect of external applied forces. The starting position of the hole is defined by a point on the edge of the hole and the angle of inclination with respect to the orthonormal axis (X, Y) whose center is the center of the hole. As well as the inclination of the load (mixed mode). Consequently, a calculation strategy is implemented based on the “special quarter point” finite element method involving the BEM and XFEM approach using ANSYS and ABAQUS software. The results obtained are allowed to define the modes of cracking in the holes of the plates. The values of the factor of stress intensities corresponding to each mode of cracking under the effect of external conditions such as the loading in mode I or in mixed mode were determined for the various calculation methods used and good agreement with the results. Analytical have been noticed. The numerical results are compared with the experimental results and good results have been observed. These stress concentrations are found in the vicinity of the holes which generate a plastic zone influencing the propagation path of the crack, which is advisable to distance the drilling of holes in the plates in order to avoid their easy ruptures and to increase their lifetime.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/CHO7725.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11559 Analyse et modélisation des fissurations dans les plaques trouées sous l’effet des conditions extérieures. [texte imprimé] / Sofiane Chorfi, Auteur ; Brahim Necib, Directeur de thèse . - 27/01/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 142 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : G. Mécanique:Construction mécanique Plaques trouées trous circulaires trous elliptiques fissuration facteurs d’intensités de contraintes modes de rupture méthodes numériques conditions extérieures Holed plates circular holes elliptical holes cracking intensity stress factors breaking modes numerical methods external conditions الألواح مثقوبة ثقب دائریة ثقب بیضاویة الشكل، تكسیر عوامل شدة الإجھاد طرق التكسر أسالیب حسابیة ظروف خارجیة Index. décimale : 620 Génie Mécanique Résumé :
The problem of cracks in continuous structures such as plates, beams, bars, trellis or hulls is often very apparent around riveting holes, notches or other connecting leaves. In fact, the holed plates assembled by riveting or bolted are of great importance in the fields of applications of mechanics, aeronautics, aerospace and civil engineering and they can be the object of considerable cracking around their holes. The presence of these cracks leads to a weakening of the structure as a result of concentrations of local stresses or deformations that can decrease their lifespan or even cause their total rupture or their disaster. These stress concentrators are often unavoidable due to the effect of external conditions such as: forces, stresses, temperature changes, humidity and others. It is therefore necessary to know these stress intensity factors associated with each geometrical plate, in order to analyse its state of stress and strain state as well as its cracking modes which can be according to modes I, II and III or mixed mode. The analysis of the propagation of cracks in industrial plate structures leads to evaluating their lifespan before their sudden rupture. In our work consists of the static and dynamic analysis of the propagation cracks around circular, elliptical holes and other shapes in thin 2D (two-dimensional) aluminum plates under the effect of external applied forces. The starting position of the hole is defined by a point on the edge of the hole and the angle of inclination with respect to the orthonormal axis (X, Y) whose center is the center of the hole. As well as the inclination of the load (mixed mode). Consequently, a calculation strategy is implemented based on the “special quarter point” finite element method involving the BEM and XFEM approach using ANSYS and ABAQUS software. The results obtained are allowed to define the modes of cracking in the holes of the plates. The values of the factor of stress intensities corresponding to each mode of cracking under the effect of external conditions such as the loading in mode I or in mixed mode were determined for the various calculation methods used and good agreement with the results. Analytical have been noticed. The numerical results are compared with the experimental results and good results have been observed. These stress concentrations are found in the vicinity of the holes which generate a plastic zone influencing the propagation path of the crack, which is advisable to distance the drilling of holes in the plates in order to avoid their easy ruptures and to increase their lifetime.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/CHO7725.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11559 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité CHO/7725 CHO/7725 Thèse Bibliothèque principale Thèses Disponible Analyse et modélisation numerique des déformations élastiques des poutres en matériaux Piézo - Laminés / Abdelaziz Lebied
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Titre : Analyse et modélisation numerique des déformations élastiques des poutres en matériaux Piézo - Laminés Type de document : texte imprimé Auteurs : Abdelaziz Lebied, Auteur ; Brahim Necib, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 155 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : matériau intelligent PZT potentiel électrique élasticité éléments finis intelligent PZT material electric potential elasticity finite elements المادة المركبة المادة الكهربائية الضغطية الذكية الكمون الكهربائي المرونة العناصر
المحدودةIndex. décimale : 620 Génie Mécanique Résumé : Currently, intelligent systems are a rapidly developing field and booming. They have a major
advantage: their adaptability to the environment, according to changing environmental conditions.
In this context, there is a surge of publications in this field since the early 80s. Since that time,
considerable efforts in basic research has been devoted to developing new adaptive structures. The
interest of these so-called smart structures is manifested by the fact that they provide optimal
extreme problems complex responses, such as micromanipulation of micro-objects whose size
ranges from a few microns to 1 mm, objects are the micro world.
.
We were able to obtain by numerical solutions using finite element method, a precise analysis of the
different modes of deformation of the piezoelectric beams, are an important aspect related to the
polarization of PZT beams. Was used in this study to extract the digital mode that interested us, the
bending mode in the plan and highlight the one hand, the effect of polarization, and on the other
hand, the mechanical properties and on operation of the piezoelectric micro-clamp suitable to secure
the plug and removal of micro-objects of any shape. We then corroborated with any benchmarking
to compare the three studies (analytical, numerical and experimental) for validation.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/LEB7117.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10484 Analyse et modélisation numerique des déformations élastiques des poutres en matériaux Piézo - Laminés [texte imprimé] / Abdelaziz Lebied, Auteur ; Brahim Necib, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2017 . - 155 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : matériau intelligent PZT potentiel électrique élasticité éléments finis intelligent PZT material electric potential elasticity finite elements المادة المركبة المادة الكهربائية الضغطية الذكية الكمون الكهربائي المرونة العناصر
المحدودةIndex. décimale : 620 Génie Mécanique Résumé : Currently, intelligent systems are a rapidly developing field and booming. They have a major
advantage: their adaptability to the environment, according to changing environmental conditions.
In this context, there is a surge of publications in this field since the early 80s. Since that time,
considerable efforts in basic research has been devoted to developing new adaptive structures. The
interest of these so-called smart structures is manifested by the fact that they provide optimal
extreme problems complex responses, such as micromanipulation of micro-objects whose size
ranges from a few microns to 1 mm, objects are the micro world.
.
We were able to obtain by numerical solutions using finite element method, a precise analysis of the
different modes of deformation of the piezoelectric beams, are an important aspect related to the
polarization of PZT beams. Was used in this study to extract the digital mode that interested us, the
bending mode in the plan and highlight the one hand, the effect of polarization, and on the other
hand, the mechanical properties and on operation of the piezoelectric micro-clamp suitable to secure
the plug and removal of micro-objects of any shape. We then corroborated with any benchmarking
to compare the three studies (analytical, numerical and experimental) for validation.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/LEB7117.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10484 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité LEB/7117 LEB/7117 Thèse Bibliothèque principale Thèses Disponible Analyse du mouvement d'un bras du corps humain sous diverses sollicitations par la méthode des éléments finis / Fouad Guerdouh
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Titre : Analyse du mouvement d'un bras du corps humain sous diverses sollicitations par la méthode des éléments finis Type de document : texte imprimé Auteurs : Fouad Guerdouh, Auteur ; Brahim Necib, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2009 Importance : 100 f. Format : 31 cm Note générale : Magister
2 copies imprimées disponiblesLangues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Mouvement Elements finis Corps humain Index. décimale : 620 Génie Mécanique Diplôme : Magistère En ligne : ../theses/gmecanique/GUE5564.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=689 Analyse du mouvement d'un bras du corps humain sous diverses sollicitations par la méthode des éléments finis [texte imprimé] / Fouad Guerdouh, Auteur ; Brahim Necib, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2009 . - 100 f. ; 31 cm.
Magister
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Mouvement Elements finis Corps humain Index. décimale : 620 Génie Mécanique Diplôme : Magistère En ligne : ../theses/gmecanique/GUE5564.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=689 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité GUE/5564 GUE/5564 Thèse Bibliothèque principale Thèses Disponible
Titre : Comportement viscoélastique des materiaux orthotropes. Type de document : texte imprimé Auteurs : Samir Ghorab, Auteur ; Brahim Necib, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2005 Importance : 114 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 : Construction mécanique Relaxation Fluage Materiaux orthotropes Viscoélasticité orthotropic materials visco elasticity creep relaxation المــــواد الأورتوتروبیة اللــزوجــة المــرنة التدفــق الاســـترخاء Index. décimale : 620 Génie Mécanique Résumé : The composites materials with organic matrix and glass fiber or carbon are finding more important applications in the areas of engineering and specially in the realization of structural pieces of various dimensions in many industrial sectors. The objective of this study is to valid the rhéological model, such as the Maxwell model, for orthotropic materials using the visco elastic theory in order to predict the creep and the relaxation responses of theses materals. Consequently, it is necessary to develop an analytical model which can pedict exactly the structural behavior of these materials under the creep and the relaxation effects. The the visco elastic behaviour law of these materials have been determinated based on the Boltzmann superposition, and the characteristic equations thus obtained are solved by two methods: the first one is based on the Carson-Laplace transformation and the author isbased on the Fourier transformation. A visco elastic behavior application for three types of orthotropic materials in the area of Carson-Laplace has been considered. The first is an unidirectional glass/vinylester, and the two others are symmetric laminated materials [(± 45° / CSM)2]S and [(90°± 45° / CSM)3]S . The compliance and relaxation coefficients of these materials are calculated using the Maxwell model in time function. While the Fourier method has been used to fined the relaxation modulus and the longitudinal and transversal stresses for the unidirectional verre/vinylester in function of the frequencies pulsations; and good results have been founds. Diplôme : Magistère En ligne : ../theses/gmecanique/GHO4290.pdf Permalink : index.php?lvl=notice_display&id=879 Comportement viscoélastique des materiaux orthotropes. [texte imprimé] / Samir Ghorab, Auteur ; Brahim Necib, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2005 . - 114 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 : Construction mécanique Relaxation Fluage Materiaux orthotropes Viscoélasticité orthotropic materials visco elasticity creep relaxation المــــواد الأورتوتروبیة اللــزوجــة المــرنة التدفــق الاســـترخاء Index. décimale : 620 Génie Mécanique Résumé : The composites materials with organic matrix and glass fiber or carbon are finding more important applications in the areas of engineering and specially in the realization of structural pieces of various dimensions in many industrial sectors. The objective of this study is to valid the rhéological model, such as the Maxwell model, for orthotropic materials using the visco elastic theory in order to predict the creep and the relaxation responses of theses materals. Consequently, it is necessary to develop an analytical model which can pedict exactly the structural behavior of these materials under the creep and the relaxation effects. The the visco elastic behaviour law of these materials have been determinated based on the Boltzmann superposition, and the characteristic equations thus obtained are solved by two methods: the first one is based on the Carson-Laplace transformation and the author isbased on the Fourier transformation. A visco elastic behavior application for three types of orthotropic materials in the area of Carson-Laplace has been considered. The first is an unidirectional glass/vinylester, and the two others are symmetric laminated materials [(± 45° / CSM)2]S and [(90°± 45° / CSM)3]S . The compliance and relaxation coefficients of these materials are calculated using the Maxwell model in time function. While the Fourier method has been used to fined the relaxation modulus and the longitudinal and transversal stresses for the unidirectional verre/vinylester in function of the frequencies pulsations; and good results have been founds. Diplôme : Magistère En ligne : ../theses/gmecanique/GHO4290.pdf Permalink : index.php?lvl=notice_display&id=879 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité GHO/4290 GHO/4290 Thèse Bibliothèque principale Thèses Disponible "Determination des proprietes mecaniques des structures discretes par modeles continus " / Mahrez LahLah
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