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Modélisation numérique du comportement dynamique de structures sous impact sévère avec un couplage éléments discrets / éléments finis.

Abstract : That study focuses on concrete structures submitted to impact loading and is aimed at predicting local damage in the vicinity of an impact zone as well as the global response of the structure. The Discrete Element Method (DEM) seems particularly well suited in this context for modeling fractures. An identification process of DEM material parameters from macroscopic data (Young's modulus, compressive and tensile strength, fracture energy, etc.) will first be presented for the purpose of enhancing reproducibility and reliability of the simulation results with DE samples of various sizes.

Then, a particular interaction, between concrete and steel elements, was developped for the simulation of reinforced concrete. The discrete elements method was validated on quasi-static and dynamic tests carried out on small samples of concrete and reinforced concrete. Finally, discret elements were used to simulate impacts on reinforced concrete slabs in order to confront the results with experimental tests.

The modeling of a large structure by means of DEM may lead to prohibitive computation times. A refined discretization becomes required in the vicinity of the impact, while the structure may be modeled using a coarse FE mesh further from the impact area, where the material behaves elastically. A coupled discrete-finite element approach is thus proposed: the impact zone is modeled by means of DE and elastic FE are used on the rest of the structure. An existing method for 3D finite elements was extended to shells. This new method was then validated on many quasi-static and dynamic tests. The proposed approach is then applied to an impact on a concrete structure in order to validate the coupled method and compare computation times.
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https://tel.archives-ouvertes.fr/tel-00411870
Contributor : Jessica Rousseau <>
Submitted on : Monday, August 31, 2009 - 9:25:55 AM
Last modification on : Thursday, November 19, 2020 - 3:54:37 PM
Long-term archiving on: : Tuesday, June 15, 2010 - 9:12:12 PM

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  • HAL Id : tel-00411870, version 1

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CNRS | UJF | 3S-R | UGA

Citation

Jessica Rousseau. Modélisation numérique du comportement dynamique de structures sous impact sévère avec un couplage éléments discrets / éléments finis.. Sciences de l'ingénieur [physics]. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00411870⟩

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