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Theses

Prévision objective de la rupture ductile en grandes déformations sous sollicitation dynamique : Modèle d'épuisement plastique à taux limités

Abstract : The aim of this thesis is to propose a robust modelling for ductile materials allowing the performance of numerical simulations up to failure without mesh dependency. The approach relies on model with bounded rate variable (time localization limiter) : failure is considered as a high dynamic phenomenon and models with bounded rate aim at controlling this dynamic effect. A model dedicated to ductile failure is proposed and allows simulating accurately with finite strain approach (necking) both crack initiation and crack propagation of metallic structures dynamically solicited. The main advantage of the model is that it is local and also leads to standard F.E. code development. The main drawback is that a dynamic resolution is required, at least for the failure process. Simulations in plane stress performed with ABAQUS/Explicit and with the enhanced model confirm the theoretical conclusions and the capabilities of the model to provide results without mesh dependency (mesh size and mesh orientation specifically). It is possible to identify a set of parameters thanks to comparisons between those simulations and test results of test coupon with hole, subjected to a dynamic loading, filmed with a high speed camera and analyzed by digital image correlation. The capacity of the model to provide predictive simulations up to failure is then illustrated with comparison between numerical and test results of test coupons without hole.
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https://tel.archives-ouvertes.fr/tel-00341991
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Submitted on : Wednesday, November 26, 2008 - 2:59:23 PM
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  • HAL Id : tel-00341991, version 1

Citation

Germain Court. Prévision objective de la rupture ductile en grandes déformations sous sollicitation dynamique : Modèle d'épuisement plastique à taux limités. Mécanique [physics.med-ph]. École normale supérieure de Cachan - ENS Cachan, 2006. Français. ⟨tel-00341991⟩

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