References of "Debongnie, Jean-François"
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See detailCompléments de fabrication mécanique et F.A.O. : édition 2013
Debongnie, Jean-François ULg

Learning material (2013)

Compléments sur l'usinage, tolérance, cotation de fabrication, contraintes résiduelles; ablocage des pièces, machines-outils à commande numérique, optimisation en usinage, procédés spéciaux d'usinage ... [more ▼]

Compléments sur l'usinage, tolérance, cotation de fabrication, contraintes résiduelles; ablocage des pièces, machines-outils à commande numérique, optimisation en usinage, procédés spéciaux d'usinage. Défauts d'usinage en chariotage, effet de la souplesse de la contrepointe. Prévision des défauts de forme par éléments finis. Détermination d'un défaut de forme. [less ▲]

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See detailConception et calcul des éléments de machine
Debongnie, Jean-François ULg

Book published by DEBONGNIE(Jean-François) - Dépôt légal D/2013/0480/7 (2013)

Texte du cours de conception mécanique donné par l'auteur aux étudiants ingénieur mécanicien de l'Université de Liège.

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See detailConception des pseudo-articulations à col paraboique
Debongnie, Jean-François ULg

in Agiuzoul, Mohammed (Ed.) 11ème Congrès de Mécanique - Actes du Congrès (2013, April)

The elastic behaviour of parabolic notch hinges submitted to the classical sollicitations of a beam is studied. For each sollicitation, an analytical solution is given first. Its asymptotic expression for ... [more ▼]

The elastic behaviour of parabolic notch hinges submitted to the classical sollicitations of a beam is studied. For each sollicitation, an analytical solution is given first. Its asymptotic expression for very narrow hinges is then obtained and finally,, an approximate factor relating the exact solution to the asymptotic one is proposed. [less ▲]

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See detailPseudo-articulations à col hyperbolique
Debongnie, Jean-François ULg

Report (2013)

This report is devoted to the elastic response of hyperbolic notch hinges. Circular, elliptic and parabolic notch hinges have been treated in ealier reports. The adopted step is the same : firstly, for ... [more ▼]

This report is devoted to the elastic response of hyperbolic notch hinges. Circular, elliptic and parabolic notch hinges have been treated in ealier reports. The adopted step is the same : firstly, for each fundamental load case, the analytical solution is developed in the frame of the classical beam theory ; from this, the asymptotic solution for very narrow hinges is produced ; thirdly, a correction factor is defined, which relates the exact theory to the asymptotic one ; finally, and this is perhaps our main originality, simple but very fair approximations of these correction factors are presented. [less ▲]

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See detailMémento de conception mécanique
Debongnie, Jean-François ULg

Book published by DEBONGNIE (JEAN-FRANCOIS) (2013)

Normal numbers. Tolerances. Alloy designation. Antifriction bearings. Journal bearings. Assembling of a shaft and a hub. Bolts. Welds. Riveted joints. Shafts. Fatigue. Hertzian contacts. Wear. Belts ... [more ▼]

Normal numbers. Tolerances. Alloy designation. Antifriction bearings. Journal bearings. Assembling of a shaft and a hub. Bolts. Welds. Riveted joints. Shafts. Fatigue. Hertzian contacts. Wear. Belts. Gearings. Illustrated lexicon. [less ▲]

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See detailPseudo-articulations à col parabolique
Debongnie, Jean-François ULg

Report (2012)

Ce rapport donne la théorie des pseudo-articulations à col parabolique. Faisant suite à des travaux antérieurs du Laboratoire de Méthodes de Fabrication, il adopte la même démarche, à savoir:1)Solution ... [more ▼]

Ce rapport donne la théorie des pseudo-articulations à col parabolique. Faisant suite à des travaux antérieurs du Laboratoire de Méthodes de Fabrication, il adopte la même démarche, à savoir:1)Solution exacte; 2)Solution asymptotique; 3)Facteur correctif pour passer de la solution exacte à la solution asymptotique 4) Expression approchée de ce facteur. Cette démarche fournit des solutions très bien approchées et beaucoup plus simples à utiliser que celles de la littérature, un fait appréciable au niveau de la conception. [less ▲]

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See detailComportement élastique des articulations flexibles à col elliptique
Debongnie, Jean-François ULg

Conference (2012, May 04)

We present here amodel for the prediction of the elastic behaviour of elliptic notch hinges, including bending and shear in both planes, stretching and torsion. In a first step, an exact solution is ... [more ▼]

We present here amodel for the prediction of the elastic behaviour of elliptic notch hinges, including bending and shear in both planes, stretching and torsion. In a first step, an exact solution is established in the frame of the beam theory, making use of Sommerfeld's change of variable, which is well known in the lubrication theory. The second step is the deduction of the asymptotic solution for very thin hinges. Finally, and yhis is the most original part of our presentation, a simple corrective factor is deduced numerically, which enables to pass from the asymptotic solution to the exact one with a fair approximation in the practical range of thicknesses. <the simplicity of the obtained model has no equivalent in the literature, which is specially useful at the design stage. [less ▲]

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See detailELEMENTS DE MACHINES II
Debongnie, Jean-François ULg

Learning material (2012)

Conception et calcul des vis et écrous (mouvements et assemblages), liaisons arbre-moyeux, paliers lisses.

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See detailCalculs d'endurance par similitude
Debongnie, Jean-François ULg

in Zenasni, Mohamed (Ed.) 10 ème Edition du Congrès International de Mécanique (2011, April)

The essential difficulty of the design against fatigue lies in the fact that the fatigue strength depends not only on the material, but also on the scale. It is true that models do exsist from long, but ... [more ▼]

The essential difficulty of the design against fatigue lies in the fact that the fatigue strength depends not only on the material, but also on the scale. It is true that models do exsist from long, but they are limited to those geometries with known stress concentration factor and known gradient. Now, there exist a lot of problems for which these two parameters are not known, the most obvious being the press-fitted assembly. Such cases will be called unpredictable notches. The aim of the present communication is to present a similarity method leading to a liable prediction of the behaviour of such notches, from partial experimental data. Comaparing the results of the present method to publishes results, a fair agreement is found. [less ▲]

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See detailElasticité
Debongnie, Jean-François ULg

Book published by DEBONGNIE (Jean-François) (2011)

Mathematical preliminaries. Kinematics of a deformable body. Virtual work principle. Hyperelastic bodies. Linear elasticity. Torsion of prismatic beams. Boussinesq's problem. Hertz problem. Variational ... [more ▼]

Mathematical preliminaries. Kinematics of a deformable body. Virtual work principle. Hyperelastic bodies. Linear elasticity. Torsion of prismatic beams. Boussinesq's problem. Hertz problem. Variational principles. Plane elasticity. Technical beam theory. Theory of plates. External energetical theorems. Influence diagrams. Stability of elastic systems. Elasticity equations in curvilinear coordinates. [less ▲]

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See detailTravaux du LTAS (Méthodes de Fabrication) en micromécanique
Debongnie, Jean-François ULg

Conference given outside the academic context (2010)

A brief summary of reserarches performed at the University of Liège in the frame of micromechanics. (slides)

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See detailCompléments de fabrication mécanique et F.A.O. (MECA2453) - Partie Debongnie
Debongnie, Jean-François ULg

Learning material (2010)

Tolerances and roughness. Manufacturing dimensioning. Effect of residual stressez. Fixtures. CNC machining. Lathe workoptimization. Nonconventional machining.

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See detailPure equilibrium tetrahedral finite elements for global error estimation by dual analysis
Kempeneers, Martin; Debongnie, Jean-François ULg; Beckers, Pierre ULg

in International Journal for Numerical Methods in Engineering (2010)

This study presents a general porocedure of creating pure equilibrium tetrahedral finite elements. These elements are of the Fraeijs de Veubeke type. The spurious kinematical modes which inevitably appear ... [more ▼]

This study presents a general porocedure of creating pure equilibrium tetrahedral finite elements. These elements are of the Fraeijs de Veubeke type. The spurious kinematical modes which inevitably appear in this approach are eliminated by converting each tetrahedron in a super-element consisting of four tetrahedral primitive elements. A mathematical discussion on the number of spurious kinematical modes is presented. The development of first and second degree elements is presented in detail, and their efficiency in the frame of global errror estimation by dual analysis is emphasized by two numerical applications. The main attribute of the error estimation by dual analysis is that it provides an upper bound of the discretization error. [less ▲]

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See detailCours de Méthodes de Fabrication
Debongnie, Jean-François ULg

Learning material (2010)

Choix d'un acier. Tolérances et états de surface. Cotation de fabrication. Effets des contraintes résiduelles. Ablocage des pièces. Liaison outil-machine. Machines-outils à commande numérique. Sciage et ... [more ▼]

Choix d'un acier. Tolérances et états de surface. Cotation de fabrication. Effets des contraintes résiduelles. Ablocage des pièces. Liaison outil-machine. Machines-outils à commande numérique. Sciage et brochage. Taillage des roues dentées. Filetage au tour. Appareil diviseur. Optimisation en chariotage. [less ▲]

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See detailLa fonction guidage en micromécanique
Merken, Patrick; Debongnie, Jean-François ULg

Book published by DEBONGNIE (JEAN-FRANCOIS) (2010)

1) Modelling the stiffness of a circular notch hinge subjected to flexure, torsion or shear : asymptotic values for a vanishing thickness and correction factors for the general case. 2) Flexible membrane ... [more ▼]

1) Modelling the stiffness of a circular notch hinge subjected to flexure, torsion or shear : asymptotic values for a vanishing thickness and correction factors for the general case. 2) Flexible membrane : stiffness for vanishing radius ratio and correction factor for the general case. 3) Conclusion. 4) Appendices, including a summary of useful formulae. [less ▲]

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See detailThermoélasticité et amortissement par thermoconduction
Debongnie, Jean-François ULg

Report (2010)

In a first chapter, fundamental notions of kinematics and statics of continua are exposed. Constitutive loads are treated in the second chapter. In the frame of thermodynamics, with the local equilibrium ... [more ▼]

In a first chapter, fundamental notions of kinematics and statics of continua are exposed. Constitutive loads are treated in the second chapter. In the frame of thermodynamics, with the local equilibrium hypothesis, the fundamental laws of thermoelasticity are easily obtained. The extreme cases of isothermic and adiabatic deformations are also considered and compared. The third chapter presents a somewhat unexpected application of the above theory, that is the damping due to thermoconduction. [less ▲]

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See detailSur la consistance du lissage des contraintes par convolution
Debongnie, Jean-François ULg

in Agouzoul, Mohammed (Ed.) Actes du neuvième congrès de mécanique (2009, April)

This paper is devoted to the analysis of a stress-smoothing procedure by convolution. The key result is that any convolution kernel does not generally lead to accurate results, it is to say, a consistency ... [more ▼]

This paper is devoted to the analysis of a stress-smoothing procedure by convolution. The key result is that any convolution kernel does not generally lead to accurate results, it is to say, a consistency condition has to be verified. Consistent kernels are then developed. [less ▲]

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See detailLECONS D'ANALYSE NUMERIQUE - PREMIERE PARTIE
Debongnie, Jean-François ULg

Book published by DEBONGNIE (JEAN-FRANCOIS) (2009)

Version étoffée d'un cours donné par l'auteur à l'EMI (Rabat) de 1979 à 1985 (première partie)

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See detailLECONS D'ANALYSE NUMERIQUE - DEUXIEME PARTIE
Debongnie, Jean-François ULg

Book published by DEBONGNIE (JEAN-FRANCOIS) (2009)

Version étoffée d'un cours donné par l'auteur à l'EMI, Rabat, de 1979 à 1985

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See detailExpertise relative à l'affaire HLMO/SONACA/SIEMENS/MUTUELLE DU MANS - Conclusions
Debongnie, Jean-François ULg

Report (2008)

La SONACA a acheté une machine-outil de grandes dimensions au constructeur français HLMO. Elle se plaint de graves dysfonctionnements. La Mutuelle du Mans intervient comme assureur et Siemens en tant que ... [more ▼]

La SONACA a acheté une machine-outil de grandes dimensions au constructeur français HLMO. Elle se plaint de graves dysfonctionnements. La Mutuelle du Mans intervient comme assureur et Siemens en tant que fabricant des moteurs linéaires. Cette expertise a duré cinq ans. [less ▲]

Detailed reference viewed: 73 (8 ULg)