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Contribution à la Modélisation Numérique en Mécanique de la Rupture et Structures Multimatériaux

Abstract : In today's industrial environment, numerical modelling is being increasingly used in order to optimise industrial processes and reduce manufacturing costs. These objectives can be achieved only if we can get an in-depth understanding of material behaviour during mechanical loading cycles. FORGE2. Multimaterials software has been developed within this framework to model large deformation of elastic-plastic or elastic-viscoplastic materials. In this thesis, we present the numerical tools that have been developed to model multiple fields and multiple materials, with a special attention to meshing and automatic remeshing techniques. We also introduce the numerical tools implemented to model crack propagation in a mesh. In order to do so, we introduce classical fracture mechanics parameters, and different techniques to compute them for a static crack. The Gθ method is implemented to compute the strain energy release rate with accuracy. We then study different criteria to model the stages of crack initiation and crack propagation. Three crack propagation criteria are compared : the maximum circumferential stress criterion, the minimum strain energy density criterion, the maximum strain energy release rate criterion. Special attention has been paid to the mesh topology at the crack tip and numerous examples are presented to show the robustness and the accuracy of our technique. Finally, we apply our different developments to the study of strain and fracture mechanisms of zircaloy 4 tubes under compaction. An experimental study is also performed to validate our numerical results and to study the influence of oxidation on the mechanical properties of zircaloy 4 tubes.
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  • HAL Id : tel-00480372, version 1

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Pierre-Olivier Bouchard. Contribution à la Modélisation Numérique en Mécanique de la Rupture et Structures Multimatériaux. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2000. Français. ⟨tel-00480372⟩

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