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Machining processes simulation : specific finite element aspects Masset, Luc ; Debongnie, Jean-François in Journal of Computational & Applied Mathematics (2004, July 01), 168(1-2), 309-320 The paper presents a simulation tool designed to predict form errors of part surfaces obtained by face milling and turning processes. For these operations, the form error is often due to the flexibility ... [more ▼] The paper presents a simulation tool designed to predict form errors of part surfaces obtained by face milling and turning processes. For these operations, the form error is often due to the flexibility of the workpiece and its supports. The finite element method is adopted to model the part geometry and to compute its deformations. Numerous load cases are required to obtain the form error so that classical resolution methods prove to be inefficient (CPU time, memory and disk space). The paper mainly focuses on the special computation scheme adopted in order to improve the resolution of such an atypical problem. [less ▲] Detailed reference viewed: 93 (31 ULg)Chatter maps for process design of powertrain components Masset, Luc ; Debongnie, Jean-François ; in Moisan, Alphonse; Poulachon, Gérard (Eds.) Proceedings of the 7th CIRP International Workshop on Modeling of Machining Operations (2004, May) During rough machining operations of powertrain components, chatter vibrations may occur on the edges of flexible structures. This paper presents a numerical method, based on the finite element method and ... [more ▼] During rough machining operations of powertrain components, chatter vibrations may occur on the edges of flexible structures. This paper presents a numerical method, based on the finite element method and Tlusty's theory, which gives a chatter map of the machined surface. Each map point represents the greatest depth of cut leading to unconditionally stable cut. Each value depends on the structural damping, the cutting stiffness and the local static stiffness, which is computed using conventional linear elastic FEA. Chatter maps offer a convenient and effective decision support system for robust process design. As a case study, the rough milling operation of a crankcase deck face with a two-stage cutter is presented. [less ▲] Detailed reference viewed: 74 (3 ULg)Sur le rang de la matrice de raideur de l'élément de tétraèdre statiqument admissible Debongnie, Jean-François Report (2004) This research concerns the rank of the stiffness matrix of the tetrahedral equilibrium element. Detailed reference viewed: 52 (5 ULg)Prise en compte des pressions réparties dans les plaques équilibre Debongnie, Jean-François Report (2004) Equilibrium plate elements are not, in their simplest version, able to take account of a distributed pressure. A particular solution has then to be added. One such solution was develpped by Sander, but is ... [more ▼] Equilibrium plate elements are not, in their simplest version, able to take account of a distributed pressure. A particular solution has then to be added. One such solution was develpped by Sander, but is only suitable for elements with first degree moments, as it makes use of the side Kirchhoff loads. This paper is devoted to the construction of a particular solution which is equilibrated by corner loads only and, therefore, compatible with the simplest plate element, that is Morley's one [less ▲] Detailed reference viewed: 29 (2 ULg)Design and test of a circular notch hinge ; ; Debongnie, Jean-François et al in Proceedings of the International Precision Assembly Seminar (2004, February) At the microscale, classical bearings such as ball bearings, sliding bearings and other pivots may be difficult to manufacture. Among all possible solutions to replace them, the notch hing seems to be ... [more ▼] At the microscale, classical bearings such as ball bearings, sliding bearings and other pivots may be difficult to manufacture. Among all possible solutions to replace them, the notch hing seems to be very attractive through its many advantages. The major limitation is on the rotation angle. This paper presents a new simplified analytical model for the prediction of the maximum angular displacement and the angular stiffness of a notch hinge. To validate our model, an experimental set-up has been developed. [less ▲] Detailed reference viewed: 91 (5 ULg)Design of an implantable micropump ; ; et al in Proceedings of the International Precision Assembly Seminar (2004, February) The implantable programmable micropump is an interesting solution to treat chronic diseases such as diabetes with regular micro-injections of medicine. However, current applications of micropumps are ... [more ▼] The implantable programmable micropump is an interesting solution to treat chronic diseases such as diabetes with regular micro-injections of medicine. However, current applications of micropumps are limited by their rather expensive cost. The challenge is therefore to develop a low cost alternative by reducing the number of parts and by simplifying the assembly. As the pump and its tank will be placed under the skin in order to increase comfort, such a system should be small and reliable. In this paper, we present the micropump we developed within the framework of the 4M-µ pump interuniversity project (Methods and Means for the Miniaturization of Machines). [less ▲] Detailed reference viewed: 92 (6 ULg)Complément au rapport final de synthèse du projet 4M-µpompe 2004 ; ; et al Report (2004) The 4M-µpump project attempts to breach the gap between traditional mechanics and micro mechanics and this in two ways. The first one consists in producing a general set of rules suitable for the ... [more ▼] The 4M-µpump project attempts to breach the gap between traditional mechanics and micro mechanics and this in two ways. The first one consists in producing a general set of rules suitable for the miniaturisation of well-known macromachines. The second one consists in developing this fundamental aspect of the research through the design and realization of an implantable pump dedicated to the administration of medication agents inside the human body. The project thus touches upon the field of design, manufacturing, metrology and assembly of mini components as well as the study of minimotors. [less ▲] Detailed reference viewed: 16 (1 ULg)Rapport final de synthèse du projet 4M-µpompe (2001-2003). Annexes Partie 2/2 (sections 3/6,7,8,9-4-5-6-7-8) ; ; et al Report (2004) micropump : drawings, tests, publications, manufacturing, medical aspects, micellaneous aspects Detailed reference viewed: 16 (1 ULg)Rapport final de synthèse du projet 4M-µPompe (2001-2003). Annexes Partie 1/2 (sections 1-2-3/1,2,3,4,5) ; ; et al Report (2004) Micropump : Modelling, Design, Drawings, Tests, Publications, Manufacturing, Medical aspects, Miscellaneous aspects. Detailed reference viewed: 19 (1 ULg)Rapport final de synthèse du projet 4M-µPompe (2001-2003) ; ; et al Report (2004) The 4M-µpump project attempts to breach the gap between traditional mechanics and micro mechanics and this in two ways. The first one consists in producing a general set of rules suitable for the ... [more ▼] The 4M-µpump project attempts to breach the gap between traditional mechanics and micro mechanics and this in two ways. The first one consists in producing a general set of rules suitable for the miniaturisation of well-known macromachines. The second one consists in developing this fundamental aspect of the research through the design and realization of an implantable pump dedicated to the administration of medication agents inside the human body. The project thus touches upon the field of design, manufacturing, metrology and assembly of mini components as well as the study of minimotors. [less ▲] Detailed reference viewed: 79 (3 ULg)Le col circulaire comme articulation flexible ; Debongnie, Jean-François Conference (2003, May) Nous présentons un modèle permettant de déterminer les dimensions du col, R et ho, en fonction du matériau, de l'angle de rotation désiré et du nombre de cycles envisagé. Dans le cas du col circulaire ... [more ▼] Nous présentons un modèle permettant de déterminer les dimensions du col, R et ho, en fonction du matériau, de l'angle de rotation désiré et du nombre de cycles envisagé. Dans le cas du col circulaire, les équations de base de la résistance des matériaux appliquées aux poutres à section variable admettent une solution analytique grâce à un changement de variable judicieux inspiré de la théorie de la lubrification. Pour un rapport entre l'épaisseur de col et son rayon tendant vers zéro, nous pouvons également dériver des formes asymptotiques des équations obtenues. Dans le cas de rapports ho/R moyens, ces résultats doivent être affectés de coefficients correcteurs qui dépendent eux-mêmes du rapport ho/R et que l'on détermine à partir des résultats numériques obtenus par la théorie complète. Ainsi, toutes les propriétés du col peuvent déduites grâce aux équations aux limites et à ces coefficients simples. [less ▲] Detailed reference viewed: 177 (10 ULg)Manufacturing of a circular notch hinge as guiding system by electrical discharge machining ; ; et al Poster (2003, April) Presentation of the notch hinge as a guiding system. Its manufacturing by wire electro-discharge machining. Notch design parameters. Future work. Detailed reference viewed: 56 (5 ULg)Solving problems with contact in machining process simulation Masset, Luc ; Debongnie, Jean-François ; in Brucato, Valerio (Ed.) Proceedings of the 6th International ESAFORM Conference on Material Forming (2003, April) At the 2001 Esaform conference, we have presented a simulation tool designed to predict form errors of part surfaces obtained by face milling and turning processes. The most relevant aspect of the ... [more ▼] At the 2001 Esaform conference, we have presented a simulation tool designed to predict form errors of part surfaces obtained by face milling and turning processes. The most relevant aspect of the developed method is its ability to solve industrial cases with huge 3D finite element meshes in a very small time. Until recently, we were only considering pure linear problems. However, the simulation of several machining operations requires the introduction of contact. The present paper describes the numerical method developed to solve such non linear problems. [less ▲] Detailed reference viewed: 208 (7 ULg)Fundamentals of finite elements Debongnie, Jean-François Book published by Les Editions de l'Université de Liège (2003) This book presents the text of an introductory course on finite element methods. As written by a member of the Aerospace Laboratory of the University of Liège, it reflects the general philosophy of this ... [more ▼] This book presents the text of an introductory course on finite element methods. As written by a member of the Aerospace Laboratory of the University of Liège, it reflects the general philosophy of this pioneering research team. [less ▲] Detailed reference viewed: 179 (29 ULg)Expertise relative à l'affaire PLB Management/Liège Auto/Opel Belgium Debongnie, Jean-François Report (2002) Expertise relative à certains dysfonctionnement d'une automobile. L'acheteur voulait faire annuler la vente. Detailed reference viewed: 46 (3 ULg)Fonctionnement et performances des couloirs oscillants à glissement Debongnie, Jean-François ; Masset, Luc in European Journal of Mechanical and Environmental Engineering (2001), 46(4), 243-254 This paper is devoted to the study of the efficiency of an oscillating trough for any value of the frequency. It is found that pure slipping or mixed cycles may occur, the latter comprising sticking ... [more ▼] This paper is devoted to the study of the efficiency of an oscillating trough for any value of the frequency. It is found that pure slipping or mixed cycles may occur, the latter comprising sticking periods. The results of the present analysis concern the cyclic displacement, the mean velocity and the dissipated power. [less ▲] Detailed reference viewed: 41 (5 ULg)Some aspects of the finite element errors Debongnie, Jean-François Learning material (2001) The first part is devoted to the a priori error estimations and includes elementary properties of Sobolev spaces. The second part treats on superconvergence. Detailed reference viewed: 59 (7 ULg)Predicting the fatigue notch effect from partial experimental data Debongnie, Jean-François in Culley, S.; Duffy, A.; McMahon, C. (Eds.) et al Proceedings of the 13th International Conference on Engineering Design. Design methods for performance and sustainability (2001, August) This paper is devoted to a new method of fatigue strength assessment, which is based on similarity relations and former results of the author on the gradient method. Detailed reference viewed: 18 (3 ULg)Consistance du lissage des contraintes par convolution Debongnie, Jean-François Report (2001) A systematic stress smoothing procedure is proposed on the basis of a convolution process. It is then found that in order to be effective, use has to be made of kernels satisfying to a consistency ... [more ▼] A systematic stress smoothing procedure is proposed on the basis of a convolution process. It is then found that in order to be effective, use has to be made of kernels satisfying to a consistency condition, that is, the true stress has not to be changed by the convolution process. A family of consistent kernels is then obtained for biharmonic stresses through a step whose inspiration comes from a book of Parton and Perline. Examples are given. [less ▲] Detailed reference viewed: 47 (3 ULg)Face milling and turning simulation with the finite element method Masset, Luc ; Debongnie, Jean-François ; Beckers, Pierre in Habraken, Anne (Ed.) Proceedings of the 4th International ESAFORM Conference on Material Forming (2001, April) The paper describes a new simulation tool that gives the machined surface error in face milling and turning. The form error component due to the workpiece flexibility is computed using Samcef finite ... [more ▼] The paper describes a new simulation tool that gives the machined surface error in face milling and turning. The form error component due to the workpiece flexibility is computed using Samcef finite element code. The finite element analyses are very efficient on industrial applications thanks to the superelement method. Results are obtained in a short time which makes possible a wide range of simulations such as finding the best tool trajectory, testing several tools and cutting conditions and choosing the most suited fixture design. [less ▲] Detailed reference viewed: 162 (6 ULg) |
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