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Etude expérimentale et simulation numérique de la mise en forme par compression et frittage de poudres

Abstract : The objective of this work is to obtain a numerical tool for the simulation and optimization of the shaping process of metal powders by compaction and sintering. The proposed method is based on an experimental study of the behaviour of the materials, a phenomenological modelling and the use of the model in a finite element code. The validation of the calculations from parts manufactured in industrial environment completes the method. The first part of this manuscript is dedicated to the study of metal powders (iron-graphite and tungsten carbide-cobalt mixtures). A wide experimental study has been more particularly performed on iron-graphite powder. The experimental conditions to be adopted to obtain the intrinsic behaviour of the material have been studied. An isotropic elastoplastic law with a single hardening parameter has been then used to simulate the compaction of a complex reference part. The confrontation between numerical and experimental results shows some differences which are discussed. The deformations during sintering are studied on tungsten carbide-cobalt powder mixtures from dilatometric measurements. The experimental results allowed identifying the parameters of a simple law. The second part of this work is dedicated to the study of strontium hexaferrite slurries used in the permanent magnet manufacturing process. The behaviour of the material has been studied under various mechanical loading and thermal conditions. We showed that the simulation of the compaction of a ferrite segment from a monophasic approach was poorly adapted because it is not representative enough of the observed phenomena. Finally anisotropic shrinkages during the sintering have been calculated with a thermoelastic model. The agreement between numerical and experimental results validates the proposed approach.
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Submitted on : Saturday, March 22, 2008 - 6:52:09 PM
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Franck Toussaint. Etude expérimentale et simulation numérique de la mise en forme par compression et frittage de poudres. Mécanique [physics.med-ph]. Institut National Polytechnique de Grenoble - INPG, 2001. Français. ⟨tel-00266456⟩

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