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Auswahl der wissenschaftlichen Literatur zum Thema „Prismes (géométrie) – Propriétés mécaniques“
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Zeitschriftenartikel zum Thema "Prismes (géométrie) – Propriétés mécaniques"
Giorgiutti-Dauphiné, Frédérique, und Ludovic Pauchard. „Craquelures et art : le temps et la matière“. Reflets de la physique, Nr. 63 (Oktober 2019): 32–37. http://dx.doi.org/10.1051/refdp/201963032.
Der volle Inhalt der QuelleFoucher, Fabrice, Sébastien Lonné, Philippe Dubois, Stéphane Leberre, Pierre Calmon, Michael Enright und Yasin Zaman. „Apports d’une cosimulation “END – Tolérance aux dommages” dans la réduction des risques de rupture“. e-journal of nondestructive testing 28, Nr. 9 (September 2023). http://dx.doi.org/10.58286/28527.
Der volle Inhalt der QuelleDissertationen zum Thema "Prismes (géométrie) – Propriétés mécaniques"
Restrepo, García Carlos Andrés. „Intégration du comportement mécanique des éléments non idéaux en analyse de tolérances par des polyèdres prismatiques“. Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0263.
Der volle Inhalt der QuelleThe architectures of new products are more complex nowadays due to the need of the marketfor customized and optimized products, the technological advancements in manufacturingmachines and inspection devices, and the extensive use of data in the product’s modelingand simulation. The evolution of manufacturing processes and the advanced measurementcapabilities in response to the market needs do not translate immediately into more accurateproducts. Actually, there is a limited consideration of geometric defects and variability inthe design process, this is partially due to the limitations of the mathematical models andtheir underlying hypothesis. The first contribution of this work is on the characterizationof the geometric variability in tolerancing. The first part of this work concerns the shaperepresentation models and specifically the adoption of the skin model shapes paradigm inthe tolerance management context using the polyhedral-based method. The skin modelinstances are more representative of individual real parts than the traditional CAD models.To simulate more realistic behavior of assemblies, the second part presents a novel approachfor simulation of rigid contact using polyhedra is presented. The approach integrates the loadboundary conditions that allow the contact between matting features by enriching the defintion of a prismatic polyhedron operand for contact simulation. With this enriched approachan objective quantification of the impact of disregarding form defects for a given mechanismcan be computed given a loading condition. An approach for simulating features potentiallyin contact by taking into account the local deformations of potentially contacting parts hasalso been developed for the polyhedral method in tolerancing. Finally, the algorithms for thecontact simulation and the generator of realistic shape representatives were implemented inan open source CAD compatible software
Guillard, Gwenaël. „Un espace de représentation pour l'étude conjointe de la morphologie et de la fonctionnalité des surfaces articulaires“. Rennes 1, 2005. http://www.theses.fr/2005REN1S148.
Der volle Inhalt der QuelleLespine, Ismael. „Influence de la géométrie des structures sur les propriétés de rupture dans les matériaux quasi-fragiles“. Bordeaux 1, 2007. http://www.theses.fr/2007BOR13533.
Der volle Inhalt der QuelleWang, Xi. „Décomposition volumique d'images pour l'étude de la microstructure de la neige“. Toulouse 3, 2014. http://thesesups.ups-tlse.fr/4736/.
Der volle Inhalt der QuelleSnow avalanches are complex natural phenomena whose occurrence is mainly due to the structure and properties of the snowpack. To better understand the evolution of these properties over time, it is important to characterize the microstructure of snow, especially in terms of grains and ice necks that connect them. In this context, the objective of this thesis is the decomposition of snow samples into individual grains from 3-D images of snow obtained by X-ray microtomography. We present two decomposition methods using algorithms of discrete geometry. Based on the results of these segmentations, some parameters such as the specific surface area and the specific contact area between grains are then estimated from samples of several snow types. These segmentation methods offer new outlooks for the characterization of the microstructure of snow, its properties, and its time evolution
Mitov, Michel. „Action du champ électrique sur des cristaux électriques chiraux en géométrie confinée“. Nice, 1993. http://www.theses.fr/1993NICE4666.
Der volle Inhalt der QuelleWe present phase diagrams of mixtures between a cholesteric liquid crystal sidechains polymer with cholesteric or nematic low molar mass liquid crystals. We describe a new phenomenon occuring at the threshold of the cholesteric / nematic transition induced by an electric field in a confined geometry (i. E. : the celle thickness is of the order of the helicoidal pitch). It consists, in optical microscopy, in the spiral shape of filaments (bound to the cholesteric phase) embedded in the homeotropic matrix (untwisted cholesteric). We give a flexo-electric type model, based on the propagation of surface distorsions, for the spirals nucleation. A growth mechanism, linked to the intrinsic structure of filaments (exhibiting a double twist) is suggested. We show how to use of a photo-crosslinkabke polymer permits to freeze field-induced structures, as the spirals, and we give the experimental process for obtaining a film for electron microscopy studies. This gelation process via a polymeric network leads to new ways for applications as for micro-structural studies
Zeroukhi, Youcef. „Analyse de la résistance d'un conducteur électrique en fonction des paramètres du procédé d'écrouissage et de sa géométrie“. Thesis, Artois, 2014. http://www.theses.fr/2014ARTO0202/document.
Der volle Inhalt der QuelleThe presented PhD thesis propose multi-physics modeling method able to predict the impact of stranding and compacting processes parameters on the mechanical and electrical behavior of stranded conductors. The electrical properties of stranded conductors depend on the nature of the material, on its metallurgical state, on the mechanical pressure within the conductor and on the electrical conductance of contact areas between wires. A wide range of measurements has allowed us to define the characteristics of structures and materials, such as for example the resistivity as a function of the stresses due to material hardening. The electromechanical modeling with Abaqus and Vector Fields software are used to study different parameters involved in the stranding and compacting processes to determine actual wires shapes, induced deformations and actual stresses between wires within the conductor. The results obtained by simulation were compared with experimental measurements to analyze the accuracy of the model. By coupling mechanical and electrical simulations, we pointed out the non-homogeneous distribution of the electrical conductivity along conductor cross sections resulting from the hardness of each single wire. Applying the optimization procedure, we have identified the parameters able to reduce the mass of conducting material by 2 % while maintaining mechanical and electrical properties that meet the prescriptive requirements of cables manufacturers and standards
Nowicki, Marcin. „Feedback linearization of mechanical control systems Geometry and flatness of m-crane systems A classification of feedback linearizable mechanical systems with 2 degrees of freedom“. Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR15.
Der volle Inhalt der QuelleThis thesis is devoted to a study of mechanical control systems, which are defined in local coordinates x = (x¹, . . . , xⁿ) on a smooth configuration manifold Q. They take the form of second-order differential equations¹ … where…are the Christoffel symbols corresponding to Coriolis and centrifugal terms, e(x) is an uncontrolled vector field on Q representing the influence of external positional forces acting on the system (e.g. gravitational or elasticity), and … are controlled vector fields in Q. Equivalently, a mechanical control system can be described by a first-order system on the tangent bundle TQ which is the state space of the system using coordinates (x,y) = (x¹, ..., xⁿ, y¹, ..., yⁿ) : … The main problem considered in this thesis is mechanical feedback linearization (shortly MF-linearization) by applying to the mechanical system the following transformations : (i) changes of coordinates given by diffeomorphisms … (ii) mechanical feedback transformations, denoted (α,β,γ), of the form … such that the transformed system is linear and mechanica
Duboc, Martin. „Etude multi-échelle du crissement : dispositif expérimental et éléments de compréhension“. Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10101/document.
Der volle Inhalt der QuelleSliding contact can cause sound vibrations like squeal for example. The aim of this PHD is to study the influence of geometric parameters, material and friction evolution of squeal occurrences. An experimental set-up has been specially developed. It is based on a simplified architecture which allows a control of the dynamic behavior. Specific instrumentation has also been taken into account. An other hand, a finite element model has been introduced to help to design and permit to conduct to parametric studies. For this study, two kinds of material were used. The first one was specifically developed for this study with a reduced formulation while the second one was a typical commercial material. Firstly, the influence of contact geometry between the pin and the disk was performed. It has shown that the contact length deeply changes the dynamic behavior. The finite element model showed the keyrole of the non-linear aspect of the material. This aspect has been taken into account in a semi- analytical model. Secondly, the study has been devoted to the influence of the material, the evolution of friction and thermal loading. Results showed different behaviors for each material. The commercial material is more sensitive to the friction evolution. Numerical simulations enriched by material characterizations were allowed to bring some understanding to the observed dynamic behavior. Finally, the study concludes with an implementation of the commercial material on a different experimental set-up. A detailed analysis of the contact surface was achieved during tests interrupted in noisy and silent states. The results show little influence of the evolution of the contact area on the occurrence of squeal
Oumarou, Noura. „La caractérisation mécanique de systèmes film-substrat par indentation instrumentée (nanoindentation) en géométrie sphère-plan“. Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL001N/document.
Der volle Inhalt der QuelleDepth sensing Indentation (nanoindentation) is an experimental technique increasing retained for the assessment of the mechanical properties of materials (hardness H, Young's modulus E) for which common homogeneous mechanical tests can not be performed or are extremely difficult to perform. The mechanical parameters are obtained from the indentation curve (the plot of the load vs penetration depth during both load and unload). Usually, some methodology reported in the literature (Oliver and pharr, Field and Swain, Doener and Nix, Loubet and al.) are used in order to assess E and H. We have performed a number of experiments on homogeneous materials (stainless steel AISI304, AISI316, AISI430; high-speed steel HSS652; glass SiO2) as well as a film-substrate system (TiN/AISI430, TiN/HSS652, TiO2/HSS652). Applying the Oliver and Pharr methodology, E end H vary with the applied load as well as the percentage of used unload curve retained for the analysis, as reported in the literature. Besides, in the case of the film-substrate system, only composite parameters are obtained instead of the in-situ films properties. In order to establish a simple strategy for the determination of the elastic modulus of a hard coating, we have carried out many simulations using a boundary element based numerical tool. Then a number of useful results have been identified. The well known elastic relation [delta]=a2/R between the relative approach [delta], the projected contact radius a and the punch radius R, remain valid in the plastic range for homogeneous as well as film-substrate specimens. This allows data indentation to be represented in term of mean pressure F/[pi]a2 vs indentation strain a/R . The initial slope of the loading part of the latter curve is proportional to the elastic modulus of the film, while the slope of the initial part of the unloading curve is proportional to the substrate elastic modulus. Our indentation procedure anlysis has been validated experimentally on a number of samples (TiN/AISI430, TiN/HSS652, TiO2/HSS652) after having established a relation between the punch displacement and the relative approach [delta]
Bottois, Paul. „Caractérisation de matériaux composites sur structures à géométries complexes par problème inverse vibratoire local“. Thesis, Le Mans, 2019. http://www.theses.fr/2019LEMA1026/document.
Der volle Inhalt der QuelleComposite materials have high stiffness for a low mass. Common methods to represent the vibratory behavior of these materials are often not appropriate, as they do not characterize the material being shaped. However, the dynamic properties of the material can vary during its manufacture and can be dependent on space. New approaches are therefore needed to better understand these phenomena.The approach proposed in this thesis uses a local inverse method, strongly inspired by the FAT (Force Analysis Technique) for the identification of material properties. This work proposes to extend the scope of this method to composite structures with complex geometry, replacing the analytical operator with a Finite Element operator. Composite materials are then considered homogeneous and their properties are sought. In the case of a complex geometry two pairs of parameters are identified, the homogenized Young's modulus of complex traction and the homogenized Young's modulus of complex bending, resulting from the coupling between the longitudinal and transverse movements. As inverse methods are known to be sensitive to measurement uncertainties, a probabilistic approach is presented to regularize measurement noise. The regularization is then automatic and does not require any parameters to be adjusted.The identification of structural parameters, which can be global or local, is presented on straight beams, curved beams, plates and shells