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Caractérisation du comportement non-linéaire des matériaux à partir d'essais statiquement indéterminés et de champs de déformation fortement hétérogènes

Abstract : In this study, tools are developed in order to characterise materials behaviour which are transformed during the structure manufacturing process (forming, assembly). For this goal, four chapters organise the approach. In the first chapter, the literature survey allows to present all methods used to characterise material non linear behaviour. After this survey, the Virtual Fields Method coupled with digitals images correlation measures, is developed to characterise material behaviour from strongly heterogeneous strain fields. The aim of this study is to better understand experimental and numerical factors which have bad impacts on identified results. The second chapter is dedicated to the development and the validation of numerical tools to characterise material behaviour. The third chapter highlights consequences caused by the used of experimental data to compute the equilibrium equation which is the base of identification method. To finish, in the last chapter, behaviour parameters are identified from strongly heterogeneous tests (0°, 45° and 90° Arcan tests). Results obtained highlight importance of hypothesis used to model the material behaviour and all advantages of the Virtuals Fields Method to characterise transformed material. However, these advantages can become disadvantages if the problem is not defined carefully.
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https://tel.archives-ouvertes.fr/tel-00508989
Contributor : Bertrand Langrand <>
Submitted on : Monday, August 9, 2010 - 3:24:46 PM
Last modification on : Friday, November 13, 2020 - 8:44:11 AM
Long-term archiving on: : Friday, November 12, 2010 - 11:32:05 AM

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  • HAL Id : tel-00508989, version 1

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Samuel Blanchard. Caractérisation du comportement non-linéaire des matériaux à partir d'essais statiquement indéterminés et de champs de déformation fortement hétérogènes. Matériaux. Université de Valenciennes et du Hainaut-Cambresis, 2009. Français. ⟨tel-00508989⟩

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