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Theses

Caractérisation expérimentale et numérique aux différentes échelles de la tenue mécanique au choc d'assemblages soudés MAG

Abstract : Finite element modeling is commonly used to design armored vehicles and to evaluate the strength of the structure against mine explosion. This study investigates experimental and numerical failure of welded structures submitted to such dynamic loadings. The goal is to develop detailed finite element models at meso-scale that allow to predict the behavior and failure of welded joints at intermediate strain rates. These models must take into account the local properties of the welded joint as the geometries as the mechanical behavior of the constitutive materials. Experimental characterizations of the material behavior are led on tensile specimens from quasi-static loading up to 1000s-1. This strain rates range results from analysis on vehicle finite element models. Dedicated tests are also conducted to study the material failure on a large range of stress triaxiality values. For each constitutive material, the hardening and failure parameters are identified through a reverse engineering approach. To validate the meso-scale models, gas gun tests are led on basic L and T welded assemblies. Modes and thresholds of failure are correctly replicated thanks to these finite element models. This validates the identified material behavior laws and the proposed meso-scale modeling.
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https://hal-uphf.archives-ouvertes.fr/tel-03358438
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Submitted on : Wednesday, September 29, 2021 - 1:33:38 PM
Last modification on : Tuesday, November 23, 2021 - 9:45:20 AM

Identifiers

  • HAL Id : tel-03358438, version 1

Citation

Julien Carrier. Caractérisation expérimentale et numérique aux différentes échelles de la tenue mécanique au choc d'assemblages soudés MAG. Mécanique [physics.med-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2016. Français. ⟨NNT : 2016VALE0016⟩. ⟨tel-03358438⟩

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